Update build for OpenSSL-1.0.0a.
[dragonfly.git] / crypto / openssl / crypto / rsa / rsa_pmeth.c
1 /* crypto/rsa/rsa_pmeth.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3  * project 2006.
4  */
5 /* ====================================================================
6  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer. 
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in
17  *    the documentation and/or other materials provided with the
18  *    distribution.
19  *
20  * 3. All advertising materials mentioning features or use of this
21  *    software must display the following acknowledgment:
22  *    "This product includes software developed by the OpenSSL Project
23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24  *
25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26  *    endorse or promote products derived from this software without
27  *    prior written permission. For written permission, please contact
28  *    licensing@OpenSSL.org.
29  *
30  * 5. Products derived from this software may not be called "OpenSSL"
31  *    nor may "OpenSSL" appear in their names without prior written
32  *    permission of the OpenSSL Project.
33  *
34  * 6. Redistributions of any form whatsoever must retain the following
35  *    acknowledgment:
36  *    "This product includes software developed by the OpenSSL Project
37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38  *
39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50  * OF THE POSSIBILITY OF SUCH DAMAGE.
51  * ====================================================================
52  *
53  * This product includes cryptographic software written by Eric Young
54  * (eay@cryptsoft.com).  This product includes software written by Tim
55  * Hudson (tjh@cryptsoft.com).
56  *
57  */
58
59 #include <stdio.h>
60 #include "cryptlib.h"
61 #include <openssl/asn1t.h>
62 #include <openssl/x509.h>
63 #include <openssl/rsa.h>
64 #include <openssl/bn.h>
65 #include <openssl/evp.h>
66 #include "../evp/evp_locl.h"
67 #include "rsa_locl.h"
68
69 /* RSA pkey context structure */
70
71 typedef struct
72         {
73         /* Key gen parameters */
74         int nbits;
75         BIGNUM *pub_exp;
76         /* Keygen callback info */
77         int gentmp[2];
78         /* RSA padding mode */
79         int pad_mode;
80         /* message digest */
81         const EVP_MD *md;
82         /* PSS/OAEP salt length */
83         int saltlen;
84         /* Temp buffer */
85         unsigned char *tbuf;
86         } RSA_PKEY_CTX;
87
88 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
89         {
90         RSA_PKEY_CTX *rctx;
91         rctx = OPENSSL_malloc(sizeof(RSA_PKEY_CTX));
92         if (!rctx)
93                 return 0;
94         rctx->nbits = 1024;
95         rctx->pub_exp = NULL;
96         rctx->pad_mode = RSA_PKCS1_PADDING;
97         rctx->md = NULL;
98         rctx->tbuf = NULL;
99
100         rctx->saltlen = -2;
101
102         ctx->data = rctx;
103         ctx->keygen_info = rctx->gentmp;
104         ctx->keygen_info_count = 2;
105         
106         return 1;
107         }
108
109 static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
110         {
111         RSA_PKEY_CTX *dctx, *sctx;
112         if (!pkey_rsa_init(dst))
113                 return 0;
114         sctx = src->data;
115         dctx = dst->data;
116         dctx->nbits = sctx->nbits;
117         if (sctx->pub_exp)
118                 {
119                 dctx->pub_exp = BN_dup(sctx->pub_exp);
120                 if (!dctx->pub_exp)
121                         return 0;
122                 }
123         dctx->pad_mode = sctx->pad_mode;
124         dctx->md = sctx->md;
125         return 1;
126         }
127
128 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
129         {
130         if (ctx->tbuf)
131                 return 1;
132         ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
133         if (!ctx->tbuf)
134                 return 0;
135         return 1;
136         }
137
138 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
139         {
140         RSA_PKEY_CTX *rctx = ctx->data;
141         if (rctx)
142                 {
143                 if (rctx->pub_exp)
144                         BN_free(rctx->pub_exp);
145                 if (rctx->tbuf)
146                         OPENSSL_free(rctx->tbuf);
147                 OPENSSL_free(rctx);
148                 }
149         }
150
151 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
152                                         const unsigned char *tbs, size_t tbslen)
153         {
154         int ret;
155         RSA_PKEY_CTX *rctx = ctx->data;
156         RSA *rsa = ctx->pkey->pkey.rsa;
157
158         if (rctx->md)
159                 {
160                 if (tbslen != (size_t)EVP_MD_size(rctx->md))
161                         {
162                         RSAerr(RSA_F_PKEY_RSA_SIGN,
163                                         RSA_R_INVALID_DIGEST_LENGTH);
164                         return -1;
165                         }
166                 if (rctx->pad_mode == RSA_X931_PADDING)
167                         {
168                         if (!setup_tbuf(rctx, ctx))
169                                 return -1;
170                         memcpy(rctx->tbuf, tbs, tbslen);
171                         rctx->tbuf[tbslen] =
172                                 RSA_X931_hash_id(EVP_MD_type(rctx->md));
173                         ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
174                                                 sig, rsa, RSA_X931_PADDING);
175                         }
176                 else if (rctx->pad_mode == RSA_PKCS1_PADDING)
177                         {
178                         unsigned int sltmp;
179                         ret = RSA_sign(EVP_MD_type(rctx->md),
180                                                 tbs, tbslen, sig, &sltmp, rsa);
181                         if (ret <= 0)
182                                 return ret;
183                         ret = sltmp;
184                         }
185                 else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
186                         {
187                         if (!setup_tbuf(rctx, ctx))
188                                 return -1;
189                         if (!RSA_padding_add_PKCS1_PSS(rsa, rctx->tbuf, tbs,
190                                                 rctx->md, rctx->saltlen))
191                                 return -1;
192                         ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
193                                                 sig, rsa, RSA_NO_PADDING);
194                         }
195                 else
196                         return -1;
197                 }
198         else
199                 ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
200                                                         rctx->pad_mode);
201         if (ret < 0)
202                 return ret;
203         *siglen = ret;
204         return 1;
205         }
206
207
208 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
209                                         unsigned char *rout, size_t *routlen,
210                                         const unsigned char *sig, size_t siglen)
211         {
212         int ret;
213         RSA_PKEY_CTX *rctx = ctx->data;
214
215         if (rctx->md)
216                 {
217                 if (rctx->pad_mode == RSA_X931_PADDING)
218                         {
219                         if (!setup_tbuf(rctx, ctx))
220                                 return -1;
221                         ret = RSA_public_decrypt(siglen, sig,
222                                                 rctx->tbuf, ctx->pkey->pkey.rsa,
223                                                 RSA_X931_PADDING);
224                         if (ret < 1)
225                                 return 0;
226                         ret--;
227                         if (rctx->tbuf[ret] !=
228                                 RSA_X931_hash_id(EVP_MD_type(rctx->md)))
229                                 {
230                                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
231                                                 RSA_R_ALGORITHM_MISMATCH);
232                                 return 0;
233                                 }
234                         if (ret != EVP_MD_size(rctx->md))
235                                 {
236                                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
237                                         RSA_R_INVALID_DIGEST_LENGTH);
238                                 return 0;
239                                 }
240                         if (rout)
241                                 memcpy(rout, rctx->tbuf, ret);
242                         }
243                 else if (rctx->pad_mode == RSA_PKCS1_PADDING)
244                         {
245                         size_t sltmp;
246                         ret = int_rsa_verify(EVP_MD_type(rctx->md),
247                                                 NULL, 0, rout, &sltmp,
248                                         sig, siglen, ctx->pkey->pkey.rsa);
249                         if (ret <= 0)
250                                 return 0;
251                         ret = sltmp;
252                         }
253                 else
254                         return -1;
255                 }
256         else
257                 ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
258                                                         rctx->pad_mode);
259         if (ret < 0)
260                 return ret;
261         *routlen = ret;
262         return 1;
263         }
264
265 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
266                                         const unsigned char *sig, size_t siglen,
267                                         const unsigned char *tbs, size_t tbslen)
268         {
269         RSA_PKEY_CTX *rctx = ctx->data;
270         RSA *rsa = ctx->pkey->pkey.rsa;
271         size_t rslen;
272         if (rctx->md)
273                 {
274                 if (rctx->pad_mode == RSA_PKCS1_PADDING)
275                         return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
276                                         sig, siglen, rsa);
277                 if (rctx->pad_mode == RSA_X931_PADDING)
278                         {
279                         if (pkey_rsa_verifyrecover(ctx, NULL, &rslen,
280                                         sig, siglen) <= 0)
281                                 return 0;
282                         }
283                 else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
284                         {
285                         int ret;
286                         if (!setup_tbuf(rctx, ctx))
287                                 return -1;
288                         ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
289                                                         rsa, RSA_NO_PADDING);
290                         if (ret <= 0)
291                                 return 0;
292                         ret = RSA_verify_PKCS1_PSS(rsa, tbs, rctx->md,
293                                                 rctx->tbuf, rctx->saltlen);
294                         if (ret <= 0)
295                                 return 0;
296                         return 1;
297                         }
298                 else
299                         return -1;
300                 }
301         else
302                 {
303                 if (!setup_tbuf(rctx, ctx))
304                         return -1;
305                 rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
306                                                 rsa, rctx->pad_mode);
307                 if (rslen == 0)
308                         return 0;
309                 }
310
311         if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
312                 return 0;
313
314         return 1;
315                         
316         }
317         
318
319 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
320                                         unsigned char *out, size_t *outlen,
321                                         const unsigned char *in, size_t inlen)
322         {
323         int ret;
324         RSA_PKEY_CTX *rctx = ctx->data;
325         ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
326                                                         rctx->pad_mode);
327         if (ret < 0)
328                 return ret;
329         *outlen = ret;
330         return 1;
331         }
332
333 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
334                                         unsigned char *out, size_t *outlen,
335                                         const unsigned char *in, size_t inlen)
336         {
337         int ret;
338         RSA_PKEY_CTX *rctx = ctx->data;
339         ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
340                                                         rctx->pad_mode);
341         if (ret < 0)
342                 return ret;
343         *outlen = ret;
344         return 1;
345         }
346
347 static int check_padding_md(const EVP_MD *md, int padding)
348         {
349         if (!md)
350                 return 1;
351
352         if (padding == RSA_NO_PADDING)
353                 {
354                 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
355                 return 0;
356                 }
357
358         if (padding == RSA_X931_PADDING)
359                 {
360                 if (RSA_X931_hash_id(EVP_MD_type(md)) == -1)
361                         {
362                         RSAerr(RSA_F_CHECK_PADDING_MD,
363                                                 RSA_R_INVALID_X931_DIGEST);
364                         return 0;
365                         }
366                 return 1;
367                 }
368
369         return 1;
370         }
371                         
372
373 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
374         {
375         RSA_PKEY_CTX *rctx = ctx->data;
376         switch (type)
377                 {
378                 case EVP_PKEY_CTRL_RSA_PADDING:
379                 if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING))
380                         {
381                         if (!check_padding_md(rctx->md, p1))
382                                 return 0;
383                         if (p1 == RSA_PKCS1_PSS_PADDING) 
384                                 {
385                                 if (!(ctx->operation &
386                                      (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
387                                         goto bad_pad;
388                                 if (!rctx->md)
389                                         rctx->md = EVP_sha1();
390                                 }
391                         if (p1 == RSA_PKCS1_OAEP_PADDING) 
392                                 {
393                                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
394                                         goto bad_pad;
395                                 if (!rctx->md)
396                                         rctx->md = EVP_sha1();
397                                 }
398                         rctx->pad_mode = p1;
399                         return 1;
400                         }
401                 bad_pad:
402                 RSAerr(RSA_F_PKEY_RSA_CTRL,
403                                 RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
404                 return -2;
405
406                 case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
407                 if (p1 < -2)
408                         return -2;
409                 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING)
410                         {
411                         RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
412                         return -2;
413                         }
414                 rctx->saltlen = p1;
415                 return 1;
416
417                 case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
418                 if (p1 < 256)
419                         {
420                         RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_KEYBITS);
421                         return -2;
422                         }
423                 rctx->nbits = p1;
424                 return 1;
425
426                 case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
427                 if (!p2)
428                         return -2;
429                 rctx->pub_exp = p2;
430                 return 1;
431
432                 case EVP_PKEY_CTRL_MD:
433                 if (!check_padding_md(p2, rctx->pad_mode))
434                         return 0;
435                 rctx->md = p2;
436                 return 1;
437
438                 case EVP_PKEY_CTRL_DIGESTINIT:
439                 case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
440                 case EVP_PKEY_CTRL_PKCS7_DECRYPT:
441                 case EVP_PKEY_CTRL_PKCS7_SIGN:
442 #ifndef OPENSSL_NO_CMS
443                 case EVP_PKEY_CTRL_CMS_ENCRYPT:
444                 case EVP_PKEY_CTRL_CMS_DECRYPT:
445                 case EVP_PKEY_CTRL_CMS_SIGN:
446 #endif
447                 return 1;
448                 case EVP_PKEY_CTRL_PEER_KEY:
449                         RSAerr(RSA_F_PKEY_RSA_CTRL,
450                         RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
451                         return -2;      
452
453                 default:
454                 return -2;
455
456                 }
457         }
458                         
459 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
460                         const char *type, const char *value)
461         {
462         if (!value)
463                 {
464                 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
465                 return 0;
466                 }
467         if (!strcmp(type, "rsa_padding_mode"))
468                 {
469                 int pm;
470                 if (!strcmp(value, "pkcs1"))
471                         pm = RSA_PKCS1_PADDING;
472                 else if (!strcmp(value, "sslv23"))
473                         pm = RSA_SSLV23_PADDING;
474                 else if (!strcmp(value, "none"))
475                         pm = RSA_NO_PADDING;
476                 else if (!strcmp(value, "oeap"))
477                         pm = RSA_PKCS1_OAEP_PADDING;
478                 else if (!strcmp(value, "x931"))
479                         pm = RSA_X931_PADDING;
480                 else if (!strcmp(value, "pss"))
481                         pm = RSA_PKCS1_PSS_PADDING;
482                 else
483                         {
484                         RSAerr(RSA_F_PKEY_RSA_CTRL_STR,
485                                                 RSA_R_UNKNOWN_PADDING_TYPE);
486                         return -2;
487                         }
488                 return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
489                 }
490
491         if (!strcmp(type, "rsa_pss_saltlen"))
492                 {
493                 int saltlen;
494                 saltlen = atoi(value);
495                 return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
496                 }
497
498         if (!strcmp(type, "rsa_keygen_bits"))
499                 {
500                 int nbits;
501                 nbits = atoi(value);
502                 return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
503                 }
504
505         if (!strcmp(type, "rsa_keygen_pubexp"))
506                 {
507                 int ret;
508                 BIGNUM *pubexp = NULL;
509                 if (!BN_asc2bn(&pubexp, value))
510                         return 0;
511                 ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
512                 if (ret <= 0)
513                         BN_free(pubexp);
514                 return ret;
515                 }
516
517         return -2;
518         }
519
520 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
521         {
522         RSA *rsa = NULL;
523         RSA_PKEY_CTX *rctx = ctx->data;
524         BN_GENCB *pcb, cb;
525         int ret;
526         if (!rctx->pub_exp)
527                 {
528                 rctx->pub_exp = BN_new();
529                 if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
530                         return 0;
531                 }
532         rsa = RSA_new();
533         if (!rsa)
534                 return 0;
535         if (ctx->pkey_gencb)
536                 {
537                 pcb = &cb;
538                 evp_pkey_set_cb_translate(pcb, ctx);
539                 }
540         else
541                 pcb = NULL;
542         ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
543         if (ret > 0)
544                 EVP_PKEY_assign_RSA(pkey, rsa);
545         else
546                 RSA_free(rsa);
547         return ret;
548         }
549
550 const EVP_PKEY_METHOD rsa_pkey_meth = 
551         {
552         EVP_PKEY_RSA,
553         EVP_PKEY_FLAG_AUTOARGLEN,
554         pkey_rsa_init,
555         pkey_rsa_copy,
556         pkey_rsa_cleanup,
557
558         0,0,
559
560         0,
561         pkey_rsa_keygen,
562
563         0,
564         pkey_rsa_sign,
565
566         0,
567         pkey_rsa_verify,
568
569         0,
570         pkey_rsa_verifyrecover,
571
572
573         0,0,0,0,
574
575         0,
576         pkey_rsa_encrypt,
577
578         0,
579         pkey_rsa_decrypt,
580
581         0,0,
582
583         pkey_rsa_ctrl,
584         pkey_rsa_ctrl_str
585
586
587         };