ldns: Update vendor branch from 1.6.16 to 1.7.0
[dragonfly.git] / contrib / ldns / dnssec.c
1 /*
2  * dnssec.c
3  *
4  * contains the cryptographic function needed for DNSSEC in ldns
5  * The crypto library used is openssl
6  *
7  * (c) NLnet Labs, 2004-2008
8  *
9  * See the file LICENSE for the license
10  */
11
12 #include <ldns/config.h>
13
14 #include <ldns/ldns.h>
15 #include <ldns/dnssec.h>
16
17 #include <strings.h>
18 #include <time.h>
19
20 #ifdef HAVE_SSL
21 #include <openssl/ssl.h>
22 #include <openssl/evp.h>
23 #include <openssl/rand.h>
24 #include <openssl/err.h>
25 #include <openssl/md5.h>
26 #endif
27
28 ldns_rr *
29 ldns_dnssec_get_rrsig_for_name_and_type(const ldns_rdf *name,
30                                         const ldns_rr_type type,
31                                         const ldns_rr_list *rrs)
32 {
33         size_t i;
34         ldns_rr *candidate;
35
36         if (!name || !rrs) {
37                 return NULL;
38         }
39
40         for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
41                 candidate = ldns_rr_list_rr(rrs, i);
42                 if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_RRSIG) {
43                         if (ldns_dname_compare(ldns_rr_owner(candidate),
44                                                name) == 0 &&
45                             ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(candidate))
46                             == type
47                             ) {
48                                 return candidate;
49                         }
50                 }
51         }
52
53         return NULL;
54 }
55
56 ldns_rr *
57 ldns_dnssec_get_dnskey_for_rrsig(const ldns_rr *rrsig,
58                                                    const ldns_rr_list *rrs)
59 {
60         size_t i;
61         ldns_rr *candidate;
62
63         if (!rrsig || !rrs) {
64                 return NULL;
65         }
66
67         for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
68                 candidate = ldns_rr_list_rr(rrs, i);
69                 if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_DNSKEY) {
70                         if (ldns_dname_compare(ldns_rr_owner(candidate),
71                                                ldns_rr_rrsig_signame(rrsig)) == 0 &&
72                             ldns_rdf2native_int16(ldns_rr_rrsig_keytag(rrsig)) ==
73                             ldns_calc_keytag(candidate)
74                             ) {
75                                 return candidate;
76                         }
77                 }
78         }
79
80         return NULL;
81 }
82
83 ldns_rdf *
84 ldns_nsec_get_bitmap(const ldns_rr *nsec) {
85         if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) {
86                 return ldns_rr_rdf(nsec, 1);
87         } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) {
88                 return ldns_rr_rdf(nsec, 5);
89         } else {
90                 return NULL;
91         }
92 }
93
94 /*return the owner name of the closest encloser for name from the list of rrs */
95 /* this is NOT the hash, but the original name! */
96 ldns_rdf *
97 ldns_dnssec_nsec3_closest_encloser(const ldns_rdf *qname,
98                                    ATTR_UNUSED(ldns_rr_type qtype),
99                                    const ldns_rr_list *nsec3s)
100 {
101         /* remember parameters, they must match */
102         uint8_t algorithm;
103         uint32_t iterations;
104         uint8_t salt_length;
105         uint8_t *salt;
106
107         ldns_rdf *sname, *hashed_sname, *tmp;
108         bool flag;
109
110         bool exact_match_found;
111         bool in_range_found;
112
113         ldns_status status;
114         ldns_rdf *zone_name;
115
116         size_t nsec_i;
117         ldns_rr *nsec;
118         ldns_rdf *result = NULL;
119
120         if (!qname || !nsec3s || ldns_rr_list_rr_count(nsec3s) < 1) {
121                 return NULL;
122         }
123
124         nsec = ldns_rr_list_rr(nsec3s, 0);
125         algorithm = ldns_nsec3_algorithm(nsec);
126         salt_length = ldns_nsec3_salt_length(nsec);
127         salt = ldns_nsec3_salt_data(nsec);
128         iterations = ldns_nsec3_iterations(nsec);
129
130         sname = ldns_rdf_clone(qname);
131
132         flag = false;
133
134         zone_name = ldns_dname_left_chop(ldns_rr_owner(nsec));
135
136         /* algorithm from nsec3-07 8.3 */
137         while (ldns_dname_label_count(sname) > 0) {
138                 exact_match_found = false;
139                 in_range_found = false;
140
141                 hashed_sname = ldns_nsec3_hash_name(sname,
142                                                                          algorithm,
143                                                                          iterations,
144                                                                          salt_length,
145                                                                          salt);
146
147                 status = ldns_dname_cat(hashed_sname, zone_name);
148                 if(status != LDNS_STATUS_OK) {
149                         LDNS_FREE(salt);
150                         ldns_rdf_deep_free(zone_name);
151                         ldns_rdf_deep_free(sname);
152                         return NULL;
153                 }
154
155                 for (nsec_i = 0; nsec_i < ldns_rr_list_rr_count(nsec3s); nsec_i++) {
156                         nsec = ldns_rr_list_rr(nsec3s, nsec_i);
157
158                         /* check values of iterations etc! */
159
160                         /* exact match? */
161                         if (ldns_dname_compare(ldns_rr_owner(nsec), hashed_sname) == 0) {
162                                 exact_match_found = true;
163                         } else if (ldns_nsec_covers_name(nsec, hashed_sname)) {
164                                 in_range_found = true;
165                         }
166
167                 }
168                 if (!exact_match_found && in_range_found) {
169                         flag = true;
170                 } else if (exact_match_found && flag) {
171                         result = ldns_rdf_clone(sname);
172                         /* RFC 5155: 8.3. 2.** "The proof is complete" */
173                         ldns_rdf_deep_free(hashed_sname);
174                         goto done;
175                 } else if (exact_match_found && !flag) {
176                         /* error! */
177                         ldns_rdf_deep_free(hashed_sname);
178                         goto done;
179                 } else {
180                         flag = false;
181                 }
182
183                 ldns_rdf_deep_free(hashed_sname);
184                 tmp = sname;
185                 sname = ldns_dname_left_chop(sname);
186                 ldns_rdf_deep_free(tmp);
187         }
188
189         done:
190         LDNS_FREE(salt);
191         ldns_rdf_deep_free(zone_name);
192         ldns_rdf_deep_free(sname);
193
194         return result;
195 }
196
197 bool
198 ldns_dnssec_pkt_has_rrsigs(const ldns_pkt *pkt)
199 {
200         size_t i;
201         for (i = 0; i < ldns_pkt_ancount(pkt); i++) {
202                 if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_answer(pkt), i)) ==
203                     LDNS_RR_TYPE_RRSIG) {
204                         return true;
205                 }
206         }
207         for (i = 0; i < ldns_pkt_nscount(pkt); i++) {
208                 if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_authority(pkt), i)) ==
209                     LDNS_RR_TYPE_RRSIG) {
210                         return true;
211                 }
212         }
213         return false;
214 }
215
216 ldns_rr_list *
217 ldns_dnssec_pkt_get_rrsigs_for_name_and_type(const ldns_pkt *pkt,
218                                                                         const ldns_rdf *name,
219                                                                         ldns_rr_type type)
220 {
221         uint16_t t_netorder;
222         ldns_rr_list *sigs;
223         ldns_rr_list *sigs_covered;
224         ldns_rdf *rdf_t;
225         
226         sigs = ldns_pkt_rr_list_by_name_and_type(pkt,
227                                                                          name,
228                                                                          LDNS_RR_TYPE_RRSIG,
229                                                                          LDNS_SECTION_ANY_NOQUESTION
230                                                                          );
231
232         t_netorder = htons(type); /* rdf are in network order! */
233         rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, LDNS_RDF_SIZE_WORD, &t_netorder);
234         sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
235         
236         ldns_rdf_free(rdf_t);
237         ldns_rr_list_deep_free(sigs);
238
239         return sigs_covered;
240
241 }
242
243 ldns_rr_list *
244 ldns_dnssec_pkt_get_rrsigs_for_type(const ldns_pkt *pkt, ldns_rr_type type)
245 {
246         uint16_t t_netorder;
247         ldns_rr_list *sigs;
248         ldns_rr_list *sigs_covered;
249         ldns_rdf *rdf_t;
250
251         sigs = ldns_pkt_rr_list_by_type(pkt,
252                                         LDNS_RR_TYPE_RRSIG,
253                                         LDNS_SECTION_ANY_NOQUESTION
254                                                           );
255
256         t_netorder = htons(type); /* rdf are in network order! */
257         rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE,
258                                          2,
259                                          &t_netorder);
260         sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
261
262         ldns_rdf_free(rdf_t);
263         ldns_rr_list_deep_free(sigs);
264
265         return sigs_covered;
266
267 }
268
269 /* used only on the public key RR */
270 uint16_t
271 ldns_calc_keytag(const ldns_rr *key)
272 {
273         uint16_t ac16;
274         ldns_buffer *keybuf;
275         size_t keysize;
276
277         if (!key) {
278                 return 0;
279         }
280
281         if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY &&
282             ldns_rr_get_type(key) != LDNS_RR_TYPE_KEY
283             ) {
284                 return 0;
285         }
286
287         /* rdata to buf - only put the rdata in a buffer */
288         keybuf = ldns_buffer_new(LDNS_MIN_BUFLEN); /* grows */
289         if (!keybuf) {
290                 return 0;
291         }
292         (void)ldns_rr_rdata2buffer_wire(keybuf, key);
293         /* the current pos in the buffer is the keysize */
294         keysize= ldns_buffer_position(keybuf);
295
296         ac16 = ldns_calc_keytag_raw(ldns_buffer_begin(keybuf), keysize);
297         ldns_buffer_free(keybuf);
298         return ac16;
299 }
300
301 uint16_t ldns_calc_keytag_raw(const uint8_t* key, size_t keysize)
302 {
303         unsigned int i;
304         uint32_t ac32;
305         uint16_t ac16;
306
307         if(keysize < 4) {
308                 return 0;
309         }
310         /* look at the algorithm field, copied from 2535bis */
311         if (key[3] == LDNS_RSAMD5) {
312                 ac16 = 0;
313                 if (keysize > 4) {
314                         memmove(&ac16, key + keysize - 3, 2);
315                 }
316                 ac16 = ntohs(ac16);
317                 return (uint16_t) ac16;
318         } else {
319                 ac32 = 0;
320                 for (i = 0; (size_t)i < keysize; ++i) {
321                         ac32 += (i & 1) ? key[i] : key[i] << 8;
322                 }
323                 ac32 += (ac32 >> 16) & 0xFFFF;
324                 return (uint16_t) (ac32 & 0xFFFF);
325         }
326 }
327
328 #ifdef HAVE_SSL
329 DSA *
330 ldns_key_buf2dsa(const ldns_buffer *key)
331 {
332         return ldns_key_buf2dsa_raw((const unsigned char*)ldns_buffer_begin(key),
333                                                    ldns_buffer_position(key));
334 }
335
336 DSA *
337 ldns_key_buf2dsa_raw(const unsigned char* key, size_t len)
338 {
339         uint8_t T;
340         uint16_t length;
341         uint16_t offset;
342         DSA *dsa;
343         BIGNUM *Q; BIGNUM *P;
344         BIGNUM *G; BIGNUM *Y;
345
346         if(len == 0)
347                 return NULL;
348         T = (uint8_t)key[0];
349         length = (64 + T * 8);
350         offset = 1;
351
352         if (T > 8) {
353                 return NULL;
354         }
355         if(len < (size_t)1 + SHA_DIGEST_LENGTH + 3*length)
356                 return NULL;
357
358         Q = BN_bin2bn(key+offset, SHA_DIGEST_LENGTH, NULL);
359         offset += SHA_DIGEST_LENGTH;
360
361         P = BN_bin2bn(key+offset, (int)length, NULL);
362         offset += length;
363
364         G = BN_bin2bn(key+offset, (int)length, NULL);
365         offset += length;
366
367         Y = BN_bin2bn(key+offset, (int)length, NULL);
368         offset += length;
369
370         /* create the key and set its properties */
371         if(!Q || !P || !G || !Y || !(dsa = DSA_new())) {
372                 BN_free(Q);
373                 BN_free(P);
374                 BN_free(G);
375                 BN_free(Y);
376                 return NULL;
377         }
378 #if OPENSSL_VERSION_NUMBER < 0x10100000 || defined(HAVE_LIBRESSL)
379 #ifndef S_SPLINT_S
380         dsa->p = P;
381         dsa->q = Q;
382         dsa->g = G;
383         dsa->pub_key = Y;
384 #endif /* splint */
385 #else /* OPENSSL_VERSION_NUMBER */
386         if (!DSA_set0_pqg(dsa, P, Q, G)) {
387                 /* QPG not yet attached, need to free */
388                 BN_free(Q);
389                 BN_free(P);
390                 BN_free(G);
391
392                 DSA_free(dsa);
393                 BN_free(Y);
394                 return NULL;
395         }
396         if (!DSA_set0_key(dsa, Y, NULL)) {
397                 /* QPG attached, cleaned up by DSA_fre() */
398                 DSA_free(dsa);
399                 BN_free(Y);
400                 return NULL;
401         }
402 #endif /* OPENSSL_VERSION_NUMBER */
403         return dsa;
404 }
405
406 RSA *
407 ldns_key_buf2rsa(const ldns_buffer *key)
408 {
409         return ldns_key_buf2rsa_raw((const unsigned char*)ldns_buffer_begin(key),
410                                                    ldns_buffer_position(key));
411 }
412
413 RSA *
414 ldns_key_buf2rsa_raw(const unsigned char* key, size_t len)
415 {
416         uint16_t offset;
417         uint16_t exp;
418         uint16_t int16;
419         RSA *rsa;
420         BIGNUM *modulus;
421         BIGNUM *exponent;
422
423         if (len == 0)
424                 return NULL;
425         if (key[0] == 0) {
426                 if(len < 3)
427                         return NULL;
428                 /* need some smart comment here XXX*/
429                 /* the exponent is too large so it's places
430                  * futher...???? */
431                 memmove(&int16, key+1, 2);
432                 exp = ntohs(int16);
433                 offset = 3;
434         } else {
435                 exp = key[0];
436                 offset = 1;
437         }
438
439         /* key length at least one */
440         if(len < (size_t)offset + exp + 1)
441                 return NULL;
442
443         /* Exponent */
444         exponent = BN_new();
445         if(!exponent) return NULL;
446         (void) BN_bin2bn(key+offset, (int)exp, exponent);
447         offset += exp;
448
449         /* Modulus */
450         modulus = BN_new();
451         if(!modulus) {
452                 BN_free(exponent);
453                 return NULL;
454         }
455         /* length of the buffer must match the key length! */
456         (void) BN_bin2bn(key+offset, (int)(len - offset), modulus);
457
458         rsa = RSA_new();
459         if(!rsa) {
460                 BN_free(exponent);
461                 BN_free(modulus);
462                 return NULL;
463         }
464 #if OPENSSL_VERSION_NUMBER < 0x10100000 || defined(HAVE_LIBRESSL)
465 #ifndef S_SPLINT_S
466         rsa->n = modulus;
467         rsa->e = exponent;
468 #endif /* splint */
469 #else /* OPENSSL_VERSION_NUMBER */
470         if (!RSA_set0_key(rsa, modulus, exponent, NULL)) {
471                 BN_free(exponent);
472                 BN_free(modulus);
473                 RSA_free(rsa);
474                 return NULL;
475         }
476 #endif /* OPENSSL_VERSION_NUMBER */
477
478         return rsa;
479 }
480
481 int
482 ldns_digest_evp(const unsigned char* data, unsigned int len, unsigned char* dest,
483         const EVP_MD* md)
484 {
485         EVP_MD_CTX* ctx;
486         ctx = EVP_MD_CTX_create();
487         if(!ctx)
488                 return false;
489         if(!EVP_DigestInit_ex(ctx, md, NULL) ||
490                 !EVP_DigestUpdate(ctx, data, len) ||
491                 !EVP_DigestFinal_ex(ctx, dest, NULL)) {
492                 EVP_MD_CTX_destroy(ctx);
493                 return false;
494         }
495         EVP_MD_CTX_destroy(ctx);
496         return true;
497 }
498 #endif /* HAVE_SSL */
499
500 ldns_rr *
501 ldns_key_rr2ds(const ldns_rr *key, ldns_hash h)
502 {
503         ldns_rdf *tmp;
504         ldns_rr *ds;
505         uint16_t keytag;
506         uint8_t  sha1hash;
507         uint8_t *digest;
508         ldns_buffer *data_buf;
509 #ifdef USE_GOST
510         const EVP_MD* md = NULL;
511 #endif
512
513         if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY) {
514                 return NULL;
515         }
516
517         ds = ldns_rr_new();
518         if (!ds) {
519                 return NULL;
520         }
521         ldns_rr_set_type(ds, LDNS_RR_TYPE_DS);
522         ldns_rr_set_owner(ds, ldns_rdf_clone(
523                                                                   ldns_rr_owner(key)));
524         ldns_rr_set_ttl(ds, ldns_rr_ttl(key));
525         ldns_rr_set_class(ds, ldns_rr_get_class(key));
526
527         switch(h) {
528         default:
529         case LDNS_SHA1:
530                 digest = LDNS_XMALLOC(uint8_t, LDNS_SHA1_DIGEST_LENGTH);
531                 if (!digest) {
532                         ldns_rr_free(ds);
533                         return NULL;
534                 }
535                 break;
536         case LDNS_SHA256:
537                 digest = LDNS_XMALLOC(uint8_t, LDNS_SHA256_DIGEST_LENGTH);
538                 if (!digest) {
539                         ldns_rr_free(ds);
540                         return NULL;
541                 }
542                 break;
543         case LDNS_HASH_GOST:
544 #ifdef USE_GOST
545                 (void)ldns_key_EVP_load_gost_id();
546                 md = EVP_get_digestbyname("md_gost94");
547                 if(!md) {
548                         ldns_rr_free(ds);
549                         return NULL;
550                 }
551                 digest = LDNS_XMALLOC(uint8_t, EVP_MD_size(md));
552                 if (!digest) {
553                         ldns_rr_free(ds);
554                         return NULL;
555                 }
556                 break;
557 #else
558                 /* not implemented */
559                 ldns_rr_free(ds);
560                 return NULL;
561 #endif
562         case LDNS_SHA384:
563 #ifdef USE_ECDSA
564                 digest = LDNS_XMALLOC(uint8_t, SHA384_DIGEST_LENGTH);
565                 if (!digest) {
566                         ldns_rr_free(ds);
567                         return NULL;
568                 }
569                 break;
570 #else
571                 /* not implemented */
572                 ldns_rr_free(ds);
573                 return NULL;
574 #endif
575         }
576
577         data_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN);
578         if (!data_buf) {
579                 LDNS_FREE(digest);
580                 ldns_rr_free(ds);
581                 return NULL;
582         }
583
584         /* keytag */
585         keytag = htons(ldns_calc_keytag((ldns_rr*)key));
586         tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT16,
587                                                    sizeof(uint16_t),
588                                                    &keytag);
589         ldns_rr_push_rdf(ds, tmp);
590
591         /* copy the algorithm field */
592         if ((tmp = ldns_rr_rdf(key, 2)) == NULL) {
593                 LDNS_FREE(digest);
594                 ldns_buffer_free(data_buf);
595                 ldns_rr_free(ds);
596                 return NULL;
597         } else {
598                 ldns_rr_push_rdf(ds, ldns_rdf_clone( tmp )); 
599         }
600
601         /* digest hash type */
602         sha1hash = (uint8_t)h;
603         tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
604                                                    sizeof(uint8_t),
605                                                    &sha1hash);
606         ldns_rr_push_rdf(ds, tmp);
607
608         /* digest */
609         /* owner name */
610         tmp = ldns_rdf_clone(ldns_rr_owner(key));
611         ldns_dname2canonical(tmp);
612         if (ldns_rdf2buffer_wire(data_buf, tmp) != LDNS_STATUS_OK) {
613                 LDNS_FREE(digest);
614                 ldns_buffer_free(data_buf);
615                 ldns_rr_free(ds);
616                 ldns_rdf_deep_free(tmp);
617                 return NULL;
618         }
619         ldns_rdf_deep_free(tmp);
620
621         /* all the rdata's */
622         if (ldns_rr_rdata2buffer_wire(data_buf,
623                                                         (ldns_rr*)key) != LDNS_STATUS_OK) {
624                 LDNS_FREE(digest);
625                 ldns_buffer_free(data_buf);
626                 ldns_rr_free(ds);
627                 return NULL;
628         }
629         switch(h) {
630         case LDNS_SHA1:
631                 (void) ldns_sha1((unsigned char *) ldns_buffer_begin(data_buf),
632                                  (unsigned int) ldns_buffer_position(data_buf),
633                                  (unsigned char *) digest);
634
635                 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
636                                             LDNS_SHA1_DIGEST_LENGTH,
637                                             digest);
638                 ldns_rr_push_rdf(ds, tmp);
639
640                 break;
641         case LDNS_SHA256:
642                 (void) ldns_sha256((unsigned char *) ldns_buffer_begin(data_buf),
643                                    (unsigned int) ldns_buffer_position(data_buf),
644                                    (unsigned char *) digest);
645                 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
646                                             LDNS_SHA256_DIGEST_LENGTH,
647                                             digest);
648                 ldns_rr_push_rdf(ds, tmp);
649                 break;
650         case LDNS_HASH_GOST:
651 #ifdef USE_GOST
652                 if(!ldns_digest_evp((unsigned char *) ldns_buffer_begin(data_buf),
653                                 (unsigned int) ldns_buffer_position(data_buf),
654                                 (unsigned char *) digest, md)) {
655                         LDNS_FREE(digest);
656                         ldns_buffer_free(data_buf);
657                         ldns_rr_free(ds);
658                         return NULL;
659                 }
660                 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
661                                             (size_t)EVP_MD_size(md),
662                                             digest);
663                 ldns_rr_push_rdf(ds, tmp);
664 #endif
665                 break;
666         case LDNS_SHA384:
667 #ifdef USE_ECDSA
668                 (void) SHA384((unsigned char *) ldns_buffer_begin(data_buf),
669                                  (unsigned int) ldns_buffer_position(data_buf),
670                                  (unsigned char *) digest);
671                 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
672                                             SHA384_DIGEST_LENGTH,
673                                             digest);
674                 ldns_rr_push_rdf(ds, tmp);
675 #endif
676                 break;
677         }
678
679         LDNS_FREE(digest);
680         ldns_buffer_free(data_buf);
681         return ds;
682 }
683
684 /* From RFC3845:
685  *
686  * 2.1.2.  The List of Type Bit Map(s) Field
687  * 
688  *    The RR type space is split into 256 window blocks, each representing
689  *    the low-order 8 bits of the 16-bit RR type space.  Each block that
690  *    has at least one active RR type is encoded using a single octet
691  *    window number (from 0 to 255), a single octet bitmap length (from 1
692  *    to 32) indicating the number of octets used for the window block's
693  *    bitmap, and up to 32 octets (256 bits) of bitmap.
694  * 
695  *    Window blocks are present in the NSEC RR RDATA in increasing
696  *    numerical order.
697  * 
698  *    "|" denotes concatenation
699  * 
700  *    Type Bit Map(s) Field = ( Window Block # | Bitmap Length | Bitmap ) +
701  * 
702  *    <cut>
703  * 
704  *    Blocks with no types present MUST NOT be included.  Trailing zero
705  *    octets in the bitmap MUST be omitted.  The length of each block's
706  *    bitmap is determined by the type code with the largest numerical
707  *    value within that block, among the set of RR types present at the
708  *    NSEC RR's owner name.  Trailing zero octets not specified MUST be
709  *    interpreted as zero octets.
710  */
711 ldns_rdf *
712 ldns_dnssec_create_nsec_bitmap(ldns_rr_type rr_type_list[],
713                                size_t size,
714                                ldns_rr_type nsec_type)
715 {
716         uint8_t  window;                /*  most significant octet of type */
717         uint8_t  subtype;               /* least significant octet of type */
718         int      windows[256];          /* Max subtype per window */
719         uint8_t  windowpresent[256];    /* bool if window appears in bitmap */
720         ldns_rr_type* d;        /* used to traverse rr_type_list*/
721         size_t i;               /* used to traverse windows array */
722
723         size_t sz;                      /* size needed for type bitmap rdf */
724         uint8_t* data = NULL;           /* rdf data */
725         uint8_t* dptr;                  /* used to itraverse rdf data */
726         ldns_rdf* rdf;                  /* bitmap rdf to return */
727
728         if (nsec_type != LDNS_RR_TYPE_NSEC &&
729             nsec_type != LDNS_RR_TYPE_NSEC3) {
730                 return NULL;
731         }
732         memset(windows, 0, sizeof(int)*256);
733         memset(windowpresent, 0, 256);
734
735         /* Which other windows need to be in the bitmap rdf?
736          */
737         for (d = rr_type_list; d < rr_type_list + size; d++) {
738                 window  = *d >> 8;
739                 subtype = *d & 0xff;
740                 windowpresent[window] = 1;
741                 if (windows[window] < (int)subtype) {
742                         windows[window] = (int)subtype;
743                 }
744         }
745
746         /* How much space do we need in the rdf for those windows?
747          */
748         sz = 0;
749         for (i = 0; i < 256; i++) {
750                 if (windowpresent[i]) {
751                         sz += windows[i] / 8 + 3;
752                 }
753         }
754         if (sz > 0) {
755                 /* Format rdf data according RFC3845 Section 2.1.2 (see above)
756                  */
757                 dptr = data = LDNS_CALLOC(uint8_t, sz);
758                 if (!data) {
759                         return NULL;
760                 }
761                 for (i = 0; i < 256; i++) {
762                         if (windowpresent[i]) {
763                                 *dptr++ = (uint8_t)i;
764                                 *dptr++ = (uint8_t)(windows[i] / 8 + 1);
765
766                                 /* Now let windows[i] index the bitmap
767                                  * within data
768                                  */
769                                 windows[i] = (int)(dptr - data);
770
771                                 dptr += dptr[-1];
772                         }
773                 }
774         }
775
776         /* Set the bits?
777          */
778         for (d = rr_type_list; d < rr_type_list + size; d++) {
779                 subtype = *d & 0xff;
780                 data[windows[*d >> 8] + subtype/8] |= (0x80 >> (subtype % 8));
781         }
782
783         /* Allocate and return rdf structure for the data
784          */
785         rdf = ldns_rdf_new(LDNS_RDF_TYPE_BITMAP, sz, data);
786         if (!rdf) {
787                 LDNS_FREE(data);
788                 return NULL;
789         }
790         return rdf;
791 }
792
793 int
794 ldns_dnssec_rrsets_contains_type(const ldns_dnssec_rrsets *rrsets,
795                                  ldns_rr_type type)
796 {
797         const ldns_dnssec_rrsets *cur_rrset = rrsets;
798         while (cur_rrset) {
799                 if (cur_rrset->type == type) {
800                         return 1;
801                 }
802                 cur_rrset = cur_rrset->next;
803         }
804         return 0;
805 }
806
807 ldns_rr *
808 ldns_dnssec_create_nsec(const ldns_dnssec_name *from,
809                         const ldns_dnssec_name *to,
810                         ldns_rr_type nsec_type)
811 {
812         ldns_rr *nsec_rr;
813         ldns_rr_type types[65536];
814         size_t type_count = 0;
815         ldns_dnssec_rrsets *cur_rrsets;
816         int on_delegation_point;
817
818         if (!from || !to || (nsec_type != LDNS_RR_TYPE_NSEC)) {
819                 return NULL;
820         }
821
822         nsec_rr = ldns_rr_new();
823         ldns_rr_set_type(nsec_rr, nsec_type);
824         ldns_rr_set_owner(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(from)));
825         ldns_rr_push_rdf(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(to)));
826
827         on_delegation_point = ldns_dnssec_rrsets_contains_type(
828                         from->rrsets, LDNS_RR_TYPE_NS)
829                 && !ldns_dnssec_rrsets_contains_type(
830                         from->rrsets, LDNS_RR_TYPE_SOA);
831
832         cur_rrsets = from->rrsets;
833         while (cur_rrsets) {
834                 /* Do not include non-authoritative rrsets on the delegation point
835                  * in the type bitmap */
836                 if ((on_delegation_point && (
837                                 cur_rrsets->type == LDNS_RR_TYPE_NS 
838                              || cur_rrsets->type == LDNS_RR_TYPE_DS))
839                         || (!on_delegation_point &&
840                                 cur_rrsets->type != LDNS_RR_TYPE_RRSIG
841                              && cur_rrsets->type != LDNS_RR_TYPE_NSEC)) {
842
843                         types[type_count] = cur_rrsets->type;
844                         type_count++;
845                 }
846                 cur_rrsets = cur_rrsets->next;
847
848         }
849         types[type_count] = LDNS_RR_TYPE_RRSIG;
850         type_count++;
851         types[type_count] = LDNS_RR_TYPE_NSEC;
852         type_count++;
853
854         ldns_rr_push_rdf(nsec_rr, ldns_dnssec_create_nsec_bitmap(types,
855                                        type_count,
856                                        nsec_type));
857
858         return nsec_rr;
859 }
860
861 ldns_rr *
862 ldns_dnssec_create_nsec3(const ldns_dnssec_name *from,
863                                         const ldns_dnssec_name *to,
864                                         const ldns_rdf *zone_name,
865                                         uint8_t algorithm,
866                                         uint8_t flags,
867                                         uint16_t iterations,
868                                         uint8_t salt_length,
869                                         const uint8_t *salt)
870 {
871         ldns_rr *nsec_rr;
872         ldns_rr_type types[65536];
873         size_t type_count = 0;
874         ldns_dnssec_rrsets *cur_rrsets;
875         ldns_status status;
876         int on_delegation_point;
877
878         if (!from) {
879                 return NULL;
880         }
881
882         nsec_rr = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
883         ldns_rr_set_owner(nsec_rr,
884                           ldns_nsec3_hash_name(ldns_dnssec_name_name(from),
885                           algorithm,
886                           iterations,
887                           salt_length,
888                           salt));
889         status = ldns_dname_cat(ldns_rr_owner(nsec_rr), zone_name);
890         if(status != LDNS_STATUS_OK) {
891                 ldns_rr_free(nsec_rr);
892                 return NULL;
893         }
894         ldns_nsec3_add_param_rdfs(nsec_rr,
895                                   algorithm,
896                                   flags,
897                                   iterations,
898                                   salt_length,
899                                   salt);
900
901         on_delegation_point = ldns_dnssec_rrsets_contains_type(
902                         from->rrsets, LDNS_RR_TYPE_NS)
903                 && !ldns_dnssec_rrsets_contains_type(
904                         from->rrsets, LDNS_RR_TYPE_SOA);
905         cur_rrsets = from->rrsets;
906         while (cur_rrsets) {
907                 /* Do not include non-authoritative rrsets on the delegation point
908                  * in the type bitmap. Potentionally not skipping insecure
909                  * delegation should have been done earlier, in function
910                  * ldns_dnssec_zone_create_nsec3s, or even earlier in:
911                  * ldns_dnssec_zone_sign_nsec3_flg .
912                  */
913                 if ((on_delegation_point && (
914                                 cur_rrsets->type == LDNS_RR_TYPE_NS
915                              || cur_rrsets->type == LDNS_RR_TYPE_DS))
916                         || (!on_delegation_point &&
917                                 cur_rrsets->type != LDNS_RR_TYPE_RRSIG)) {
918
919                         types[type_count] = cur_rrsets->type;
920                         type_count++;
921                 }
922                 cur_rrsets = cur_rrsets->next;
923         }
924         /* always add rrsig type if this is not an unsigned
925          * delegation
926          */
927         if (type_count > 0 &&
928             !(type_count == 1 && types[0] == LDNS_RR_TYPE_NS)) {
929                 types[type_count] = LDNS_RR_TYPE_RRSIG;
930                 type_count++;
931         }
932
933         /* leave next rdata empty if they weren't precomputed yet */
934         if (to && to->hashed_name) {
935                 (void) ldns_rr_set_rdf(nsec_rr,
936                                        ldns_rdf_clone(to->hashed_name),
937                                        4);
938         } else {
939                 (void) ldns_rr_set_rdf(nsec_rr, NULL, 4);
940         }
941
942         ldns_rr_push_rdf(nsec_rr,
943                          ldns_dnssec_create_nsec_bitmap(types,
944                          type_count,
945                          LDNS_RR_TYPE_NSEC3));
946
947         return nsec_rr;
948 }
949
950 ldns_rr *
951 ldns_create_nsec(ldns_rdf *cur_owner, ldns_rdf *next_owner, ldns_rr_list *rrs)
952 {
953         /* we do not do any check here - garbage in, garbage out */
954
955         /* the the start and end names - get the type from the
956          * before rrlist */
957
958         /* inefficient, just give it a name, a next name, and a list of rrs */
959         /* we make 1 big uberbitmap first, then windows */
960         /* todo: make something more efficient :) */
961         uint16_t i;
962         ldns_rr *i_rr;
963         uint16_t i_type;
964
965         ldns_rr *nsec = NULL;
966         ldns_rr_type i_type_list[65536];
967         size_t type_count = 0;
968
969         nsec = ldns_rr_new();
970         ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC);
971         ldns_rr_set_owner(nsec, ldns_rdf_clone(cur_owner));
972         ldns_rr_push_rdf(nsec, ldns_rdf_clone(next_owner));
973
974         for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
975                 i_rr = ldns_rr_list_rr(rrs, i);
976                 if (ldns_rdf_compare(cur_owner,
977                                                  ldns_rr_owner(i_rr)) == 0) {
978                         i_type = ldns_rr_get_type(i_rr);
979                         if (i_type != LDNS_RR_TYPE_RRSIG && i_type != LDNS_RR_TYPE_NSEC) {
980                                 if (type_count == 0 || i_type_list[type_count-1] != i_type) {
981                                         i_type_list[type_count] = i_type;
982                                         type_count++;
983                                 }
984                         }
985                 }
986         }
987
988         i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
989         type_count++;
990         i_type_list[type_count] = LDNS_RR_TYPE_NSEC;
991         type_count++;
992
993         ldns_rr_push_rdf(nsec,
994                                   ldns_dnssec_create_nsec_bitmap(i_type_list,
995                                                 type_count, LDNS_RR_TYPE_NSEC));
996
997         return nsec;
998 }
999
1000 ldns_rdf *
1001 ldns_nsec3_hash_name(const ldns_rdf *name,
1002                                  uint8_t algorithm,
1003                                  uint16_t iterations,
1004                                  uint8_t salt_length,
1005                                  const uint8_t *salt)
1006 {
1007         size_t hashed_owner_str_len;
1008         ldns_rdf *cann;
1009         ldns_rdf *hashed_owner;
1010         unsigned char *hashed_owner_str;
1011         char *hashed_owner_b32;
1012         size_t hashed_owner_b32_len;
1013         uint32_t cur_it;
1014         /* define to contain the largest possible hash, which is
1015          * sha1 at the moment */
1016         unsigned char hash[LDNS_SHA1_DIGEST_LENGTH];
1017         ldns_status status;
1018
1019         /* TODO: mnemonic list for hash algs SHA-1, default to 1 now (sha1) */
1020         if (algorithm != LDNS_SHA1) {
1021                 return NULL;
1022         }
1023
1024         /* prepare the owner name according to the draft section bla */
1025         cann = ldns_rdf_clone(name);
1026         if(!cann) {
1027 #ifdef STDERR_MSGS
1028                 fprintf(stderr, "Memory error\n");
1029 #endif
1030                 return NULL;
1031         }
1032         ldns_dname2canonical(cann);
1033
1034         hashed_owner_str_len = salt_length + ldns_rdf_size(cann);
1035         hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
1036         if(!hashed_owner_str) {
1037                 ldns_rdf_deep_free(cann);
1038                 return NULL;
1039         }
1040         memcpy(hashed_owner_str, ldns_rdf_data(cann), ldns_rdf_size(cann));
1041         memcpy(hashed_owner_str + ldns_rdf_size(cann), salt, salt_length);
1042         ldns_rdf_deep_free(cann);
1043
1044         for (cur_it = iterations + 1; cur_it > 0; cur_it--) {
1045                 (void) ldns_sha1((unsigned char *) hashed_owner_str,
1046                                  (unsigned int) hashed_owner_str_len, hash);
1047
1048                 LDNS_FREE(hashed_owner_str);
1049                 hashed_owner_str_len = salt_length + LDNS_SHA1_DIGEST_LENGTH;
1050                 hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
1051                 if (!hashed_owner_str) {
1052                         return NULL;
1053                 }
1054                 memcpy(hashed_owner_str, hash, LDNS_SHA1_DIGEST_LENGTH);
1055                 memcpy(hashed_owner_str + LDNS_SHA1_DIGEST_LENGTH, salt, salt_length);
1056                 hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH + salt_length;
1057         }
1058
1059         LDNS_FREE(hashed_owner_str);
1060         hashed_owner_str = hash;
1061         hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH;
1062
1063         hashed_owner_b32 = LDNS_XMALLOC(char,
1064                   ldns_b32_ntop_calculate_size(hashed_owner_str_len) + 1);
1065         if(!hashed_owner_b32) {
1066                 return NULL;
1067         }
1068         hashed_owner_b32_len = (size_t) ldns_b32_ntop_extended_hex(
1069                 (uint8_t *) hashed_owner_str,
1070                 hashed_owner_str_len,
1071                 hashed_owner_b32,
1072                 ldns_b32_ntop_calculate_size(hashed_owner_str_len)+1);
1073         if (hashed_owner_b32_len < 1) {
1074 #ifdef STDERR_MSGS
1075                 fprintf(stderr, "Error in base32 extended hex encoding ");
1076                 fprintf(stderr, "of hashed owner name (name: ");
1077                 ldns_rdf_print(stderr, name);
1078                 fprintf(stderr, ", return code: %u)\n",
1079                         (unsigned int) hashed_owner_b32_len);
1080 #endif
1081                 LDNS_FREE(hashed_owner_b32);
1082                 return NULL;
1083         }
1084         hashed_owner_b32[hashed_owner_b32_len] = '\0';
1085
1086         status = ldns_str2rdf_dname(&hashed_owner, hashed_owner_b32);
1087         if (status != LDNS_STATUS_OK) {
1088 #ifdef STDERR_MSGS
1089                 fprintf(stderr, "Error creating rdf from %s\n", hashed_owner_b32);
1090 #endif
1091                 LDNS_FREE(hashed_owner_b32);
1092                 return NULL;
1093         }
1094
1095         LDNS_FREE(hashed_owner_b32);
1096         return hashed_owner;
1097 }
1098
1099 void
1100 ldns_nsec3_add_param_rdfs(ldns_rr *rr,
1101                                          uint8_t algorithm,
1102                                          uint8_t flags,
1103                                          uint16_t iterations,
1104                                          uint8_t salt_length,
1105                                          const uint8_t *salt)
1106 {
1107         ldns_rdf *salt_rdf = NULL;
1108         uint8_t *salt_data = NULL;
1109         ldns_rdf *old;
1110
1111         old = ldns_rr_set_rdf(rr,
1112                               ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
1113                                                     1, (void*)&algorithm),
1114                               0);
1115         if (old) ldns_rdf_deep_free(old);
1116
1117         old = ldns_rr_set_rdf(rr,
1118                               ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
1119                                                     1, (void*)&flags),
1120                               1);
1121         if (old) ldns_rdf_deep_free(old);
1122
1123         old = ldns_rr_set_rdf(rr,
1124                           ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16,
1125                                                 iterations),
1126                               2);
1127         if (old) ldns_rdf_deep_free(old);
1128
1129         salt_data = LDNS_XMALLOC(uint8_t, salt_length + 1);
1130         if(!salt_data) {
1131                 /* no way to return error */
1132                 return;
1133         }
1134         salt_data[0] = salt_length;
1135         memcpy(salt_data + 1, salt, salt_length);
1136         salt_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC3_SALT,
1137                                                            salt_length + 1,
1138                                                            salt_data);
1139         if(!salt_rdf) {
1140                 LDNS_FREE(salt_data);
1141                 /* no way to return error */
1142                 return;
1143         }
1144
1145         old = ldns_rr_set_rdf(rr, salt_rdf, 3);
1146         if (old) ldns_rdf_deep_free(old);
1147         LDNS_FREE(salt_data);
1148 }
1149
1150 static int
1151 rr_list_delegation_only(const ldns_rdf *origin, const ldns_rr_list *rr_list)
1152 {
1153         size_t i;
1154         ldns_rr *cur_rr;
1155         if (!origin || !rr_list) return 0;
1156         for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
1157                 cur_rr = ldns_rr_list_rr(rr_list, i);
1158                 if (ldns_dname_compare(ldns_rr_owner(cur_rr), origin) == 0) {
1159                         return 0;
1160                 }
1161                 if (ldns_rr_get_type(cur_rr) != LDNS_RR_TYPE_NS) {
1162                         return 0;
1163                 }
1164         }
1165         return 1;
1166 }
1167
1168 /* this will NOT return the NSEC3  completed, you will have to run the
1169    finalize function on the rrlist later! */
1170 ldns_rr *
1171 ldns_create_nsec3(const ldns_rdf *cur_owner,
1172                   const ldns_rdf *cur_zone,
1173                   const ldns_rr_list *rrs,
1174                   uint8_t algorithm,
1175                   uint8_t flags,
1176                   uint16_t iterations,
1177                   uint8_t salt_length,
1178                   const uint8_t *salt,
1179                   bool emptynonterminal)
1180 {
1181         size_t i;
1182         ldns_rr *i_rr;
1183         uint16_t i_type;
1184
1185         ldns_rr *nsec = NULL;
1186         ldns_rdf *hashed_owner = NULL;
1187
1188         ldns_status status;
1189
1190     ldns_rr_type i_type_list[1024];
1191         size_t type_count = 0;
1192
1193         hashed_owner = ldns_nsec3_hash_name(cur_owner,
1194                                                                  algorithm,
1195                                                                  iterations,
1196                                                                  salt_length,
1197                                                                  salt);
1198         status = ldns_dname_cat(hashed_owner, cur_zone);
1199         if(status != LDNS_STATUS_OK) {
1200                 ldns_rdf_deep_free(hashed_owner);
1201                 return NULL;
1202         }
1203         nsec = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
1204         if(!nsec) {
1205                 ldns_rdf_deep_free(hashed_owner);
1206                 return NULL;
1207         }
1208         ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC3);
1209         ldns_rr_set_owner(nsec, hashed_owner);
1210
1211         ldns_nsec3_add_param_rdfs(nsec,
1212                                                  algorithm,
1213                                                  flags,
1214                                                  iterations,
1215                                                  salt_length,
1216                                                  salt);
1217         (void) ldns_rr_set_rdf(nsec, NULL, 4);
1218
1219
1220         for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
1221                 i_rr = ldns_rr_list_rr(rrs, i);
1222                 if (ldns_rdf_compare(cur_owner,
1223                                                  ldns_rr_owner(i_rr)) == 0) {
1224                         i_type = ldns_rr_get_type(i_rr);
1225                         if (type_count == 0 || i_type_list[type_count-1] != i_type) {
1226                                 i_type_list[type_count] = i_type;
1227                                 type_count++;
1228                         }
1229                 }
1230         }
1231
1232         /* add RRSIG anyway, but only if this is not an ENT or
1233          * an unsigned delegation */
1234         if (!emptynonterminal && !rr_list_delegation_only(cur_zone, rrs)) {
1235                 i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
1236                 type_count++;
1237         }
1238
1239         /* and SOA if owner == zone */
1240         if (ldns_dname_compare(cur_zone, cur_owner) == 0) {
1241                 i_type_list[type_count] = LDNS_RR_TYPE_SOA;
1242                 type_count++;
1243         }
1244
1245         ldns_rr_push_rdf(nsec,
1246                                   ldns_dnssec_create_nsec_bitmap(i_type_list,
1247                                                 type_count, LDNS_RR_TYPE_NSEC3));
1248
1249         return nsec;
1250 }
1251
1252 uint8_t
1253 ldns_nsec3_algorithm(const ldns_rr *nsec3_rr)
1254 {
1255         if (nsec3_rr && 
1256               (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1257                ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1258             && (ldns_rr_rdf(nsec3_rr, 0) != NULL)
1259             && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 0)) > 0) {
1260                 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 0));
1261         }
1262         return 0;
1263 }
1264
1265 uint8_t
1266 ldns_nsec3_flags(const ldns_rr *nsec3_rr)
1267 {
1268         if (nsec3_rr && 
1269               (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1270                ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1271             && (ldns_rr_rdf(nsec3_rr, 1) != NULL)
1272             && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 1)) > 0) {
1273                 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 1));
1274         }
1275         return 0;
1276 }
1277
1278 bool
1279 ldns_nsec3_optout(const ldns_rr *nsec3_rr)
1280 {
1281         return (ldns_nsec3_flags(nsec3_rr) & LDNS_NSEC3_VARS_OPTOUT_MASK);
1282 }
1283
1284 uint16_t
1285 ldns_nsec3_iterations(const ldns_rr *nsec3_rr)
1286 {
1287         if (nsec3_rr &&
1288               (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1289                ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1290             && (ldns_rr_rdf(nsec3_rr, 2) != NULL)
1291             && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 2)) > 0) {
1292                 return ldns_rdf2native_int16(ldns_rr_rdf(nsec3_rr, 2));
1293         }
1294         return 0;
1295         
1296 }
1297
1298 ldns_rdf *
1299 ldns_nsec3_salt(const ldns_rr *nsec3_rr)
1300 {
1301         if (nsec3_rr && 
1302               (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1303                ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1304             ) {
1305                 return ldns_rr_rdf(nsec3_rr, 3);
1306         }
1307         return NULL;
1308 }
1309
1310 uint8_t
1311 ldns_nsec3_salt_length(const ldns_rr *nsec3_rr)
1312 {
1313         ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
1314         if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
1315                 return (uint8_t) ldns_rdf_data(salt_rdf)[0];
1316         }
1317         return 0;
1318 }
1319
1320 /* allocs data, free with LDNS_FREE() */
1321 uint8_t *
1322 ldns_nsec3_salt_data(const ldns_rr *nsec3_rr)
1323 {
1324         uint8_t salt_length;
1325         uint8_t *salt;
1326
1327         ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
1328         if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
1329                 salt_length = ldns_rdf_data(salt_rdf)[0];
1330                 salt = LDNS_XMALLOC(uint8_t, salt_length);
1331                 if(!salt) return NULL;
1332                 memcpy(salt, &ldns_rdf_data(salt_rdf)[1], salt_length);
1333                 return salt;
1334         }
1335         return NULL;
1336 }
1337
1338 ldns_rdf *
1339 ldns_nsec3_next_owner(const ldns_rr *nsec3_rr)
1340 {
1341         if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
1342                 return NULL;
1343         } else {
1344                 return ldns_rr_rdf(nsec3_rr, 4);
1345         }
1346 }
1347
1348 ldns_rdf *
1349 ldns_nsec3_bitmap(const ldns_rr *nsec3_rr)
1350 {
1351         if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
1352                 return NULL;
1353         } else {
1354                 return ldns_rr_rdf(nsec3_rr, 5);
1355         }
1356 }
1357
1358 ldns_rdf *
1359 ldns_nsec3_hash_name_frm_nsec3(const ldns_rr *nsec, const ldns_rdf *name)
1360 {
1361         uint8_t algorithm;
1362         uint16_t iterations;
1363         uint8_t salt_length;
1364         uint8_t *salt = 0;
1365
1366         ldns_rdf *hashed_owner;
1367
1368         algorithm = ldns_nsec3_algorithm(nsec);
1369         salt_length = ldns_nsec3_salt_length(nsec);
1370         salt = ldns_nsec3_salt_data(nsec);
1371         iterations = ldns_nsec3_iterations(nsec);
1372
1373         hashed_owner = ldns_nsec3_hash_name(name,
1374                                                                  algorithm,
1375                                                                  iterations,
1376                                                                  salt_length,
1377                                                                  salt);
1378
1379         LDNS_FREE(salt);
1380         return hashed_owner;
1381 }
1382
1383 bool
1384 ldns_nsec_bitmap_covers_type(const ldns_rdf* bitmap, ldns_rr_type type)
1385 {
1386         uint8_t* dptr;
1387         uint8_t* dend;
1388
1389         /* From RFC3845 Section 2.1.2:
1390          *
1391          *      "The RR type space is split into 256 window blocks, each re-
1392          *       presenting the low-order 8 bits of the 16-bit RR type space."
1393          */
1394         uint8_t  window = type >> 8;
1395         uint8_t subtype = type & 0xff;
1396
1397         if (! bitmap) {
1398                 return false;
1399         }
1400         assert(ldns_rdf_get_type(bitmap) == LDNS_RDF_TYPE_BITMAP);
1401
1402         dptr = ldns_rdf_data(bitmap);
1403         dend = ldns_rdf_data(bitmap) + ldns_rdf_size(bitmap);
1404
1405         /* Type Bitmap = ( Window Block # | Bitmap Length | Bitmap ) +
1406          *                 dptr[0]          dptr[1]         dptr[2:]
1407          */
1408         while (dptr < dend && dptr[0] <= window) {
1409
1410                 if (dptr[0] == window && subtype / 8 < dptr[1] &&
1411                                 dptr + dptr[1] + 2 <= dend) {
1412
1413                         return dptr[2 + subtype / 8] & (0x80 >> (subtype % 8));
1414                 }
1415                 dptr += dptr[1] + 2; /* next window */
1416         }
1417         return false;
1418 }
1419
1420 ldns_status
1421 ldns_nsec_bitmap_set_type(ldns_rdf* bitmap, ldns_rr_type type)
1422 {
1423         uint8_t* dptr;
1424         uint8_t* dend;
1425
1426         /* From RFC3845 Section 2.1.2:
1427          *
1428          *      "The RR type space is split into 256 window blocks, each re-
1429          *       presenting the low-order 8 bits of the 16-bit RR type space."
1430          */
1431         uint8_t  window = type >> 8;
1432         uint8_t subtype = type & 0xff;
1433
1434         if (! bitmap) {
1435                 return false;
1436         }
1437         assert(ldns_rdf_get_type(bitmap) == LDNS_RDF_TYPE_BITMAP);
1438
1439         dptr = ldns_rdf_data(bitmap);
1440         dend = ldns_rdf_data(bitmap) + ldns_rdf_size(bitmap);
1441
1442         /* Type Bitmap = ( Window Block # | Bitmap Length | Bitmap ) +
1443          *                 dptr[0]          dptr[1]         dptr[2:]
1444          */
1445         while (dptr < dend && dptr[0] <= window) {
1446
1447                 if (dptr[0] == window && subtype / 8 < dptr[1] &&
1448                                 dptr + dptr[1] + 2 <= dend) {
1449
1450                         dptr[2 + subtype / 8] |= (0x80 >> (subtype % 8));
1451                         return LDNS_STATUS_OK;
1452                 }
1453                 dptr += dptr[1] + 2; /* next window */
1454         }
1455         return LDNS_STATUS_TYPE_NOT_IN_BITMAP;
1456 }
1457
1458 ldns_status
1459 ldns_nsec_bitmap_clear_type(ldns_rdf* bitmap, ldns_rr_type type)
1460 {
1461         uint8_t* dptr;
1462         uint8_t* dend;
1463
1464         /* From RFC3845 Section 2.1.2:
1465          *
1466          *      "The RR type space is split into 256 window blocks, each re-
1467          *       presenting the low-order 8 bits of the 16-bit RR type space."
1468          */
1469         uint8_t  window = type >> 8;
1470         uint8_t subtype = type & 0xff;
1471
1472         if (! bitmap) {
1473                 return false;
1474         }
1475
1476         assert(ldns_rdf_get_type(bitmap) == LDNS_RDF_TYPE_BITMAP);
1477
1478         dptr = ldns_rdf_data(bitmap);
1479         dend = ldns_rdf_data(bitmap) + ldns_rdf_size(bitmap);
1480
1481         /* Type Bitmap = ( Window Block # | Bitmap Length | Bitmap ) +
1482          *                 dptr[0]          dptr[1]         dptr[2:]
1483          */
1484         while (dptr < dend && dptr[0] <= window) {
1485
1486                 if (dptr[0] == window && subtype / 8 < dptr[1] &&
1487                                 dptr + dptr[1] + 2 <= dend) {
1488
1489                         dptr[2 + subtype / 8] &= ~(0x80 >> (subtype % 8));
1490                         return LDNS_STATUS_OK;
1491                 }
1492                 dptr += dptr[1] + 2; /* next window */
1493         }
1494         return LDNS_STATUS_TYPE_NOT_IN_BITMAP;
1495 }
1496
1497
1498 bool
1499 ldns_nsec_covers_name(const ldns_rr *nsec, const ldns_rdf *name)
1500 {
1501         ldns_rdf *nsec_owner = ldns_rr_owner(nsec);
1502         ldns_rdf *hash_next;
1503         char *next_hash_str;
1504         ldns_rdf *nsec_next = NULL;
1505         ldns_status status;
1506         ldns_rdf *chopped_dname;
1507         bool result;
1508
1509         if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) {
1510                 if (ldns_rr_rdf(nsec, 0) != NULL) {
1511                         nsec_next = ldns_rdf_clone(ldns_rr_rdf(nsec, 0));
1512                 } else {
1513                         return false;
1514                 }
1515         } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) {
1516                 hash_next = ldns_nsec3_next_owner(nsec);
1517                 next_hash_str = ldns_rdf2str(hash_next);
1518                 nsec_next = ldns_dname_new_frm_str(next_hash_str);
1519                 LDNS_FREE(next_hash_str);
1520                 chopped_dname = ldns_dname_left_chop(nsec_owner);
1521                 status = ldns_dname_cat(nsec_next, chopped_dname);
1522                 ldns_rdf_deep_free(chopped_dname);
1523                 if (status != LDNS_STATUS_OK) {
1524                         printf("error catting: %s\n", ldns_get_errorstr_by_id(status));
1525                 }
1526         } else {
1527                 ldns_rdf_deep_free(nsec_next);
1528                 return false;
1529         }
1530
1531         /* in the case of the last nsec */
1532         if(ldns_dname_compare(nsec_owner, nsec_next) > 0) {
1533                 result = (ldns_dname_compare(nsec_owner, name) <= 0 ||
1534                                 ldns_dname_compare(name, nsec_next) < 0);
1535         } else if(ldns_dname_compare(nsec_owner, nsec_next) < 0) {
1536                 result = (ldns_dname_compare(nsec_owner, name) <= 0 &&
1537                           ldns_dname_compare(name, nsec_next) < 0);
1538         } else {
1539                 result = true;
1540         }
1541
1542         ldns_rdf_deep_free(nsec_next);
1543         return result;
1544 }
1545
1546 #ifdef HAVE_SSL
1547 /* sig may be null - if so look in the packet */
1548
1549 ldns_status
1550 ldns_pkt_verify_time(const ldns_pkt *p, ldns_rr_type t, const ldns_rdf *o, 
1551                 const ldns_rr_list *k, const ldns_rr_list *s, 
1552                 time_t check_time, ldns_rr_list *good_keys)
1553 {
1554         ldns_rr_list *rrset;
1555         ldns_rr_list *sigs;
1556         ldns_rr_list *sigs_covered;
1557         ldns_rdf *rdf_t;
1558         ldns_rr_type t_netorder;
1559
1560         if (!k) {
1561                 return LDNS_STATUS_ERR;
1562                 /* return LDNS_STATUS_CRYPTO_NO_DNSKEY; */
1563         }
1564
1565         if (t == LDNS_RR_TYPE_RRSIG) {
1566                 /* we don't have RRSIG(RRSIG) (yet? ;-) ) */
1567                 return LDNS_STATUS_ERR;
1568         }
1569
1570         if (s) {
1571                 /* if s is not NULL, the sigs are given to use */
1572                 sigs = (ldns_rr_list *)s;
1573         } else {
1574                 /* otherwise get them from the packet */
1575                 sigs = ldns_pkt_rr_list_by_name_and_type(p, o,
1576                                 LDNS_RR_TYPE_RRSIG,
1577                                 LDNS_SECTION_ANY_NOQUESTION);
1578                 if (!sigs) {
1579                         /* no sigs */
1580                         return LDNS_STATUS_ERR;
1581                         /* return LDNS_STATUS_CRYPTO_NO_RRSIG; */
1582                 }
1583         }
1584
1585         /* rrsig are subtyped, so now we need to find the correct
1586          * sigs for the type t
1587          */
1588         t_netorder = htons(t); /* rdf are in network order! */
1589         /* a type identifier is a 16-bit number, so the size is 2 bytes */
1590         rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, 2, &t_netorder);
1591
1592         sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
1593         ldns_rdf_free(rdf_t);
1594         if (! sigs_covered) {
1595                 if (! s) {
1596                         ldns_rr_list_deep_free(sigs);
1597                 }
1598                 return LDNS_STATUS_ERR;
1599         }
1600         ldns_rr_list_deep_free(sigs_covered);
1601
1602         rrset = ldns_pkt_rr_list_by_name_and_type(p, o, t,
1603                         LDNS_SECTION_ANY_NOQUESTION);
1604         if (!rrset) {
1605                 if (! s) {
1606                         ldns_rr_list_deep_free(sigs);
1607                 }
1608                 return LDNS_STATUS_ERR;
1609         }
1610         return ldns_verify_time(rrset, sigs, k, check_time, good_keys);
1611 }
1612
1613 ldns_status
1614 ldns_pkt_verify(const ldns_pkt *p, ldns_rr_type t, const ldns_rdf *o, 
1615                 const ldns_rr_list *k, const ldns_rr_list *s, ldns_rr_list *good_keys)
1616 {
1617         return ldns_pkt_verify_time(p, t, o, k, s, ldns_time(NULL), good_keys);
1618 }
1619 #endif /* HAVE_SSL */
1620
1621 ldns_status
1622 ldns_dnssec_chain_nsec3_list(ldns_rr_list *nsec3_rrs)
1623 {
1624         size_t i;
1625         char *next_nsec_owner_str;
1626         ldns_rdf *next_nsec_owner_label;
1627         ldns_rdf *next_nsec_rdf;
1628         ldns_status status = LDNS_STATUS_OK;
1629
1630         for (i = 0; i < ldns_rr_list_rr_count(nsec3_rrs); i++) {
1631                 if (i == ldns_rr_list_rr_count(nsec3_rrs) - 1) {
1632                         next_nsec_owner_label =
1633                                 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
1634                                                                                                           0)), 0);
1635                         next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
1636                         if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1637                             == '.') {
1638                                 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1639                                         = '\0';
1640                         }
1641                         status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
1642                                                                         next_nsec_owner_str);
1643                         if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
1644                                                          next_nsec_rdf, 4)) {
1645                                 /* todo: error */
1646                         }
1647
1648                         ldns_rdf_deep_free(next_nsec_owner_label);
1649                         LDNS_FREE(next_nsec_owner_str);
1650                 } else {
1651                         next_nsec_owner_label =
1652                                 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
1653                                                                                                           i + 1)),
1654                                                           0);
1655                         next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
1656                         if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1657                             == '.') {
1658                                 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1659                                         = '\0';
1660                         }
1661                         status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
1662                                                                         next_nsec_owner_str);
1663                         ldns_rdf_deep_free(next_nsec_owner_label);
1664                         LDNS_FREE(next_nsec_owner_str);
1665                         if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
1666                                                          next_nsec_rdf, 4)) {
1667                                 /* todo: error */
1668                         }
1669                 }
1670         }
1671         return status;
1672 }
1673
1674 int
1675 qsort_rr_compare_nsec3(const void *a, const void *b)
1676 {
1677         const ldns_rr *rr1 = * (const ldns_rr **) a;
1678         const ldns_rr *rr2 = * (const ldns_rr **) b;
1679         if (rr1 == NULL && rr2 == NULL) {
1680                 return 0;
1681         }
1682         if (rr1 == NULL) {
1683                 return -1;
1684         }
1685         if (rr2 == NULL) {
1686                 return 1;
1687         }
1688         return ldns_rdf_compare(ldns_rr_owner(rr1), ldns_rr_owner(rr2));
1689 }
1690
1691 void
1692 ldns_rr_list_sort_nsec3(ldns_rr_list *unsorted)
1693 {
1694         qsort(unsorted->_rrs,
1695               ldns_rr_list_rr_count(unsorted),
1696               sizeof(ldns_rr *),
1697               qsort_rr_compare_nsec3);
1698 }
1699
1700 int
1701 ldns_dnssec_default_add_to_signatures( ATTR_UNUSED(ldns_rr *sig)
1702                                      , ATTR_UNUSED(void *n)
1703                                      )
1704 {
1705         return LDNS_SIGNATURE_LEAVE_ADD_NEW;
1706 }
1707
1708 int
1709 ldns_dnssec_default_leave_signatures( ATTR_UNUSED(ldns_rr *sig)
1710                                     , ATTR_UNUSED(void *n)
1711                                     )
1712 {
1713         return LDNS_SIGNATURE_LEAVE_NO_ADD;
1714 }
1715
1716 int
1717 ldns_dnssec_default_delete_signatures( ATTR_UNUSED(ldns_rr *sig)
1718                                      , ATTR_UNUSED(void *n)
1719                                      )
1720 {
1721         return LDNS_SIGNATURE_REMOVE_NO_ADD;
1722 }
1723
1724 int
1725 ldns_dnssec_default_replace_signatures( ATTR_UNUSED(ldns_rr *sig)
1726                                       , ATTR_UNUSED(void *n)
1727                                       )
1728 {
1729         return LDNS_SIGNATURE_REMOVE_ADD_NEW;
1730 }
1731
1732 #ifdef HAVE_SSL
1733 ldns_rdf *
1734 ldns_convert_dsa_rrsig_asn12rdf(const ldns_buffer *sig,
1735                                                   const long sig_len)
1736 {
1737 #ifdef USE_DSA
1738         ldns_rdf *sigdata_rdf;
1739         DSA_SIG *dsasig;
1740         const BIGNUM *R, *S;
1741         unsigned char *dsasig_data = (unsigned char*)ldns_buffer_begin(sig);
1742         size_t byte_offset;
1743
1744         dsasig = d2i_DSA_SIG(NULL,
1745                                          (const unsigned char **)&dsasig_data,
1746                                          sig_len);
1747         if (!dsasig) {
1748                 DSA_SIG_free(dsasig);
1749                 return NULL;
1750         }
1751
1752         dsasig_data = LDNS_XMALLOC(unsigned char, 41);
1753         if(!dsasig_data) {
1754                 DSA_SIG_free(dsasig);
1755                 return NULL;
1756         }
1757         dsasig_data[0] = 0;
1758 # ifdef HAVE_DSA_SIG_GET0
1759         DSA_SIG_get0(dsasig, &R, &S);
1760 # else
1761         R = dsasig->r;
1762         S = dsasig->s;
1763 # endif
1764         byte_offset = (size_t) (20 - BN_num_bytes(R));
1765         if (byte_offset > 20) {
1766                 DSA_SIG_free(dsasig);
1767                 LDNS_FREE(dsasig_data);
1768                 return NULL;
1769         }
1770         memset(&dsasig_data[1], 0, byte_offset);
1771         BN_bn2bin(R, &dsasig_data[1 + byte_offset]);
1772         byte_offset = (size_t) (20 - BN_num_bytes(S));
1773         if (byte_offset > 20) {
1774                 DSA_SIG_free(dsasig);
1775                 LDNS_FREE(dsasig_data);
1776                 return NULL;
1777         }
1778         memset(&dsasig_data[21], 0, byte_offset);
1779         BN_bn2bin(S, &dsasig_data[21 + byte_offset]);
1780
1781         sigdata_rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, 41, dsasig_data);
1782         if(!sigdata_rdf) {
1783                 LDNS_FREE(dsasig_data);
1784         }
1785         DSA_SIG_free(dsasig);
1786
1787         return sigdata_rdf;
1788 #else
1789         (void)sig; (void)sig_len;
1790         return NULL;
1791 #endif
1792 }
1793
1794 ldns_status
1795 ldns_convert_dsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
1796                                                   const ldns_rdf *sig_rdf)
1797 {
1798 #ifdef USE_DSA
1799         /* the EVP api wants the DER encoding of the signature... */
1800         BIGNUM *R, *S;
1801         DSA_SIG *dsasig;
1802         unsigned char *raw_sig = NULL;
1803         int raw_sig_len;
1804
1805         if(ldns_rdf_size(sig_rdf) < 1 + 2*SHA_DIGEST_LENGTH)
1806                 return LDNS_STATUS_SYNTAX_RDATA_ERR;
1807         /* extract the R and S field from the sig buffer */
1808         R = BN_new();
1809         if(!R) return LDNS_STATUS_MEM_ERR;
1810         (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 1,
1811                          SHA_DIGEST_LENGTH, R);
1812         S = BN_new();
1813         if(!S) {
1814                 BN_free(R);
1815                 return LDNS_STATUS_MEM_ERR;
1816         }
1817         (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 21,
1818                          SHA_DIGEST_LENGTH, S);
1819
1820         dsasig = DSA_SIG_new();
1821         if (!dsasig) {
1822                 BN_free(R);
1823                 BN_free(S);
1824                 return LDNS_STATUS_MEM_ERR;
1825         }
1826 # ifdef HAVE_DSA_SIG_SET0
1827        if (! DSA_SIG_set0(dsasig, R, S))
1828                return LDNS_STATUS_SSL_ERR;
1829 # else
1830         dsasig->r = R;
1831         dsasig->s = S;
1832 # endif
1833
1834         raw_sig_len = i2d_DSA_SIG(dsasig, &raw_sig);
1835         if (raw_sig_len < 0) {
1836                 DSA_SIG_free(dsasig);
1837                 free(raw_sig);
1838                 return LDNS_STATUS_SSL_ERR;
1839         }
1840         if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
1841                 ldns_buffer_write(target_buffer, raw_sig, (size_t)raw_sig_len);
1842         }
1843
1844         DSA_SIG_free(dsasig);
1845         free(raw_sig);
1846
1847         return ldns_buffer_status(target_buffer);
1848 #else
1849         (void)target_buffer; (void)sig_rdf;
1850         return LDNS_STATUS_CRYPTO_ALGO_NOT_IMPL;
1851 #endif
1852 }
1853
1854 #ifdef USE_ECDSA
1855 #ifndef S_SPLINT_S
1856 ldns_rdf *
1857 ldns_convert_ecdsa_rrsig_asn1len2rdf(const ldns_buffer *sig,
1858         const long sig_len, int num_bytes)
1859 {
1860         ECDSA_SIG* ecdsa_sig;
1861         const BIGNUM *r, *s;
1862         unsigned char *data = (unsigned char*)ldns_buffer_begin(sig);
1863         ldns_rdf* rdf;
1864         ecdsa_sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&data, sig_len);
1865         if(!ecdsa_sig) return NULL;
1866
1867 #ifdef HAVE_ECDSA_SIG_GET0
1868         ECDSA_SIG_get0(ecdsa_sig, &r, &s);
1869 #else
1870         r = ecdsa_sig->r;
1871         s = ecdsa_sig->s;
1872 #endif
1873         /* "r | s". */
1874         if(BN_num_bytes(r) > num_bytes ||
1875                 BN_num_bytes(s) > num_bytes) {
1876                 ECDSA_SIG_free(ecdsa_sig);
1877                 return NULL; /* numbers too big for passed curve size */
1878         }
1879         data = LDNS_XMALLOC(unsigned char, num_bytes*2);
1880         if(!data) {
1881                 ECDSA_SIG_free(ecdsa_sig);
1882                 return NULL;
1883         }
1884         /* write the bignums (in big-endian) a little offset if the BN code
1885          * wants to write a shorter number of bytes, with zeroes prefixed */
1886         memset(data, 0, num_bytes*2);
1887         BN_bn2bin(r, data+num_bytes-BN_num_bytes(r));
1888         BN_bn2bin(s, data+num_bytes*2-BN_num_bytes(s));
1889         rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, (size_t)(num_bytes*2), data);
1890         ECDSA_SIG_free(ecdsa_sig);
1891         return rdf;
1892 }
1893
1894 ldns_status
1895 ldns_convert_ecdsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
1896         const ldns_rdf *sig_rdf)
1897 {
1898         /* convert from two BIGNUMs in the rdata buffer, to ASN notation.
1899          * ASN preable:  30440220 <R 32bytefor256> 0220 <S 32bytefor256>
1900          * the '20' is the length of that field (=bnsize).
1901          * the '44' is the total remaining length.
1902          * if negative, start with leading zero.
1903          * if starts with 00s, remove them from the number.
1904          */
1905         uint8_t pre[] = {0x30, 0x44, 0x02, 0x20};
1906         int pre_len = 4;
1907         uint8_t mid[] = {0x02, 0x20};
1908         int mid_len = 2;
1909         int raw_sig_len, r_high, s_high, r_rem=0, s_rem=0;
1910         long bnsize = (long)ldns_rdf_size(sig_rdf) / 2;
1911         uint8_t* d = ldns_rdf_data(sig_rdf);
1912         /* if too short, or not even length, do not bother */
1913         if(bnsize < 16 || (size_t)bnsize*2 != ldns_rdf_size(sig_rdf))
1914                 return LDNS_STATUS_ERR;
1915         /* strip leading zeroes from r (but not last one) */
1916         while(r_rem < bnsize-1 && d[r_rem] == 0)
1917                 r_rem++;
1918         /* strip leading zeroes from s (but not last one) */
1919         while(s_rem < bnsize-1 && d[bnsize+s_rem] == 0)
1920                 s_rem++;
1921
1922         r_high = ((d[0+r_rem]&0x80)?1:0);
1923         s_high = ((d[bnsize+s_rem]&0x80)?1:0);
1924         raw_sig_len = pre_len + r_high + bnsize - r_rem + mid_len +
1925                 s_high + bnsize - s_rem;
1926         if(ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
1927                 ldns_buffer_write_u8(target_buffer, pre[0]);
1928                 ldns_buffer_write_u8(target_buffer, raw_sig_len-2);
1929                 ldns_buffer_write_u8(target_buffer, pre[2]);
1930                 ldns_buffer_write_u8(target_buffer, bnsize + r_high - r_rem);
1931                 if(r_high)
1932                         ldns_buffer_write_u8(target_buffer, 0);
1933                 ldns_buffer_write(target_buffer, d+r_rem, bnsize-r_rem);
1934                 ldns_buffer_write(target_buffer, mid, mid_len-1);
1935                 ldns_buffer_write_u8(target_buffer, bnsize + s_high - s_rem);
1936                 if(s_high)
1937                         ldns_buffer_write_u8(target_buffer, 0);
1938                 ldns_buffer_write(target_buffer, d+bnsize+s_rem, bnsize-s_rem);
1939         }
1940         return ldns_buffer_status(target_buffer);
1941 }
1942
1943 #endif /* S_SPLINT_S */
1944 #endif /* USE_ECDSA */
1945
1946 #if defined(USE_ED25519) || defined(USE_ED448)
1947 /* debug printout routine */
1948 static void print_hex(const char* str, uint8_t* d, int len)
1949 {
1950         const char hex[] = "0123456789abcdef";
1951         int i;
1952         printf("%s [len=%d]: ", str, len);
1953         for(i=0; i<len; i++) {
1954                 int x = (d[i]&0xf0)>>4;
1955                 int y = (d[i]&0x0f);
1956                 printf("%c%c", hex[x], hex[y]);
1957         }
1958         printf("\n");
1959 }
1960 #endif
1961
1962 #ifdef USE_ED25519
1963 ldns_rdf *
1964 ldns_convert_ed25519_rrsig_asn12rdf(const ldns_buffer *sig, long sig_len)
1965 {
1966         unsigned char *data = (unsigned char*)ldns_buffer_begin(sig);
1967         ldns_rdf* rdf = NULL;
1968
1969         /* TODO when Openssl supports signing and you can test this */
1970         print_hex("sig in ASN", data, sig_len);
1971
1972         return rdf;
1973 }
1974
1975 ldns_status
1976 ldns_convert_ed25519_rrsig_rdf2asn1(ldns_buffer *target_buffer,
1977         const ldns_rdf *sig_rdf)
1978 {
1979         /* TODO when Openssl supports signing and you can test this. */
1980         /* convert sig_buf into ASN1 into the target_buffer */
1981         print_hex("sig raw", ldns_rdf_data(sig_rdf), ldns_rdf_size(sig_rdf));
1982         return ldns_buffer_status(target_buffer);
1983 }
1984 #endif /* USE_ED25519 */
1985
1986 #ifdef USE_ED448
1987 ldns_rdf *
1988 ldns_convert_ed448_rrsig_asn12rdf(const ldns_buffer *sig, long sig_len)
1989 {
1990         unsigned char *data = (unsigned char*)ldns_buffer_begin(sig);
1991         ldns_rdf* rdf = NULL;
1992
1993         /* TODO when Openssl supports signing and you can test this */
1994         print_hex("sig in ASN", data, sig_len);
1995
1996         return rdf;
1997 }
1998
1999 ldns_status
2000 ldns_convert_ed448_rrsig_rdf2asn1(ldns_buffer *target_buffer,
2001         const ldns_rdf *sig_rdf)
2002 {
2003         /* TODO when Openssl supports signing and you can test this. */
2004         /* convert sig_buf into ASN1 into the target_buffer */
2005         print_hex("sig raw", ldns_rdf_data(sig_rdf), ldns_rdf_size(sig_rdf));
2006         return ldns_buffer_status(target_buffer);
2007 }
2008 #endif /* USE_ED448 */
2009
2010 #endif /* HAVE_SSL */