2 * Portions Copyright (C) 2004-2007, 2009 Internet Systems Consortium, Inc. ("ISC")
3 * Portions Copyright (C) 1999-2002 Internet Software Consortium.
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS
10 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
11 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE
12 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
15 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 * Portions Copyright (C) 1995-2000 by Network Associates, Inc.
19 * Permission to use, copy, modify, and/or distribute this software for any
20 * purpose with or without fee is hereby granted, provided that the above
21 * copyright notice and this permission notice appear in all copies.
23 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS
24 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
25 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE
26 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
27 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
28 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
29 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
32 /* $Id: openssldsa_link.c,v 1.11.92.2 2009/01/14 23:46:33 tbox Exp $ */
40 #include <isc/entropy.h>
45 #include <dst/result.h>
47 #include "dst_internal.h"
48 #include "dst_openssl.h"
49 #include "dst_parse.h"
51 #include <openssl/dsa.h>
53 static isc_result_t openssldsa_todns(const dst_key_t *key, isc_buffer_t *data);
56 openssldsa_createctx(dst_key_t *key, dst_context_t *dctx) {
61 sha1ctx = isc_mem_get(dctx->mctx, sizeof(isc_sha1_t));
62 isc_sha1_init(sha1ctx);
63 dctx->ctxdata.sha1ctx = sha1ctx;
64 return (ISC_R_SUCCESS);
68 openssldsa_destroyctx(dst_context_t *dctx) {
69 isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
71 if (sha1ctx != NULL) {
72 isc_sha1_invalidate(sha1ctx);
73 isc_mem_put(dctx->mctx, sha1ctx, sizeof(isc_sha1_t));
74 dctx->ctxdata.sha1ctx = NULL;
79 openssldsa_adddata(dst_context_t *dctx, const isc_region_t *data) {
80 isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
82 isc_sha1_update(sha1ctx, data->base, data->length);
83 return (ISC_R_SUCCESS);
87 BN_bn2bin_fixed(BIGNUM *bn, unsigned char *buf, int size) {
88 int bytes = size - BN_num_bytes(bn);
96 openssldsa_sign(dst_context_t *dctx, isc_buffer_t *sig) {
97 isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
98 dst_key_t *key = dctx->key;
99 DSA *dsa = key->keydata.dsa;
102 unsigned char digest[ISC_SHA1_DIGESTLENGTH];
104 isc_buffer_availableregion(sig, &r);
105 if (r.length < ISC_SHA1_DIGESTLENGTH * 2 + 1)
106 return (ISC_R_NOSPACE);
108 isc_sha1_final(sha1ctx, digest);
110 dsasig = DSA_do_sign(digest, ISC_SHA1_DIGESTLENGTH, dsa);
112 return (dst__openssl_toresult(DST_R_SIGNFAILURE));
114 *r.base++ = (key->key_size - 512)/64;
115 BN_bn2bin_fixed(dsasig->r, r.base, ISC_SHA1_DIGESTLENGTH);
116 r.base += ISC_SHA1_DIGESTLENGTH;
117 BN_bn2bin_fixed(dsasig->s, r.base, ISC_SHA1_DIGESTLENGTH);
118 r.base += ISC_SHA1_DIGESTLENGTH;
119 DSA_SIG_free(dsasig);
120 isc_buffer_add(sig, ISC_SHA1_DIGESTLENGTH * 2 + 1);
122 return (ISC_R_SUCCESS);
126 openssldsa_verify(dst_context_t *dctx, const isc_region_t *sig) {
127 isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
128 dst_key_t *key = dctx->key;
129 DSA *dsa = key->keydata.dsa;
132 unsigned char digest[ISC_SHA1_DIGESTLENGTH];
133 unsigned char *cp = sig->base;
135 isc_sha1_final(sha1ctx, digest);
137 if (sig->length < 2 * ISC_SHA1_DIGESTLENGTH + 1)
138 return (DST_R_VERIFYFAILURE);
141 dsasig = DSA_SIG_new();
142 dsasig->r = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
143 cp += ISC_SHA1_DIGESTLENGTH;
144 dsasig->s = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
145 cp += ISC_SHA1_DIGESTLENGTH;
147 status = DSA_do_verify(digest, ISC_SHA1_DIGESTLENGTH, dsasig, dsa);
148 DSA_SIG_free(dsasig);
150 return (dst__openssl_toresult(DST_R_VERIFYFAILURE));
152 return (ISC_R_SUCCESS);
156 openssldsa_compare(const dst_key_t *key1, const dst_key_t *key2) {
160 dsa1 = key1->keydata.dsa;
161 dsa2 = key2->keydata.dsa;
163 if (dsa1 == NULL && dsa2 == NULL)
165 else if (dsa1 == NULL || dsa2 == NULL)
168 status = BN_cmp(dsa1->p, dsa2->p) ||
169 BN_cmp(dsa1->q, dsa2->q) ||
170 BN_cmp(dsa1->g, dsa2->g) ||
171 BN_cmp(dsa1->pub_key, dsa2->pub_key);
176 if (dsa1->priv_key != NULL || dsa2->priv_key != NULL) {
177 if (dsa1->priv_key == NULL || dsa2->priv_key == NULL)
179 if (BN_cmp(dsa1->priv_key, dsa2->priv_key))
186 openssldsa_generate(dst_key_t *key, int unused) {
187 #if OPENSSL_VERSION_NUMBER > 0x00908000L
191 unsigned char rand_array[ISC_SHA1_DIGESTLENGTH];
196 result = dst__entropy_getdata(rand_array, sizeof(rand_array),
198 if (result != ISC_R_SUCCESS)
201 #if OPENSSL_VERSION_NUMBER > 0x00908000L
204 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
206 BN_GENCB_set_old(&cb, NULL, NULL);
208 if (!DSA_generate_parameters_ex(dsa, key->key_size, rand_array,
209 ISC_SHA1_DIGESTLENGTH, NULL, NULL,
213 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
216 dsa = DSA_generate_parameters(key->key_size, rand_array,
217 ISC_SHA1_DIGESTLENGTH, NULL, NULL,
220 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
223 if (DSA_generate_key(dsa) == 0) {
225 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
227 dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
229 key->keydata.dsa = dsa;
231 return (ISC_R_SUCCESS);
235 openssldsa_isprivate(const dst_key_t *key) {
236 DSA *dsa = key->keydata.dsa;
237 return (ISC_TF(dsa != NULL && dsa->priv_key != NULL));
241 openssldsa_destroy(dst_key_t *key) {
242 DSA *dsa = key->keydata.dsa;
244 key->keydata.dsa = NULL;
249 openssldsa_todns(const dst_key_t *key, isc_buffer_t *data) {
253 unsigned int t, p_bytes;
255 REQUIRE(key->keydata.dsa != NULL);
257 dsa = key->keydata.dsa;
259 isc_buffer_availableregion(data, &r);
261 t = (BN_num_bytes(dsa->p) - 64) / 8;
263 return (DST_R_INVALIDPUBLICKEY);
264 p_bytes = 64 + 8 * t;
266 dnslen = 1 + (key->key_size * 3)/8 + ISC_SHA1_DIGESTLENGTH;
267 if (r.length < (unsigned int) dnslen)
268 return (ISC_R_NOSPACE);
271 BN_bn2bin_fixed(dsa->q, r.base, ISC_SHA1_DIGESTLENGTH);
272 r.base += ISC_SHA1_DIGESTLENGTH;
273 BN_bn2bin_fixed(dsa->p, r.base, key->key_size/8);
275 BN_bn2bin_fixed(dsa->g, r.base, key->key_size/8);
277 BN_bn2bin_fixed(dsa->pub_key, r.base, key->key_size/8);
280 isc_buffer_add(data, dnslen);
282 return (ISC_R_SUCCESS);
286 openssldsa_fromdns(dst_key_t *key, isc_buffer_t *data) {
289 unsigned int t, p_bytes;
290 isc_mem_t *mctx = key->mctx;
294 isc_buffer_remainingregion(data, &r);
296 return (ISC_R_SUCCESS);
300 return (ISC_R_NOMEMORY);
301 dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
303 t = (unsigned int) *r.base++;
306 return (DST_R_INVALIDPUBLICKEY);
308 p_bytes = 64 + 8 * t;
310 if (r.length < 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes) {
312 return (DST_R_INVALIDPUBLICKEY);
315 dsa->q = BN_bin2bn(r.base, ISC_SHA1_DIGESTLENGTH, NULL);
316 r.base += ISC_SHA1_DIGESTLENGTH;
318 dsa->p = BN_bin2bn(r.base, p_bytes, NULL);
321 dsa->g = BN_bin2bn(r.base, p_bytes, NULL);
324 dsa->pub_key = BN_bin2bn(r.base, p_bytes, NULL);
327 key->key_size = p_bytes * 8;
329 isc_buffer_forward(data, 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes);
331 key->keydata.dsa = dsa;
333 return (ISC_R_SUCCESS);
338 openssldsa_tofile(const dst_key_t *key, const char *directory) {
342 unsigned char bufs[5][128];
344 if (key->keydata.dsa == NULL)
345 return (DST_R_NULLKEY);
347 dsa = key->keydata.dsa;
349 priv.elements[cnt].tag = TAG_DSA_PRIME;
350 priv.elements[cnt].length = BN_num_bytes(dsa->p);
351 BN_bn2bin(dsa->p, bufs[cnt]);
352 priv.elements[cnt].data = bufs[cnt];
355 priv.elements[cnt].tag = TAG_DSA_SUBPRIME;
356 priv.elements[cnt].length = BN_num_bytes(dsa->q);
357 BN_bn2bin(dsa->q, bufs[cnt]);
358 priv.elements[cnt].data = bufs[cnt];
361 priv.elements[cnt].tag = TAG_DSA_BASE;
362 priv.elements[cnt].length = BN_num_bytes(dsa->g);
363 BN_bn2bin(dsa->g, bufs[cnt]);
364 priv.elements[cnt].data = bufs[cnt];
367 priv.elements[cnt].tag = TAG_DSA_PRIVATE;
368 priv.elements[cnt].length = BN_num_bytes(dsa->priv_key);
369 BN_bn2bin(dsa->priv_key, bufs[cnt]);
370 priv.elements[cnt].data = bufs[cnt];
373 priv.elements[cnt].tag = TAG_DSA_PUBLIC;
374 priv.elements[cnt].length = BN_num_bytes(dsa->pub_key);
375 BN_bn2bin(dsa->pub_key, bufs[cnt]);
376 priv.elements[cnt].data = bufs[cnt];
379 priv.nelements = cnt;
380 return (dst__privstruct_writefile(key, &priv, directory));
384 openssldsa_parse(dst_key_t *key, isc_lex_t *lexer) {
389 isc_mem_t *mctx = key->mctx;
390 #define DST_RET(a) {ret = a; goto err;}
392 /* read private key file */
393 ret = dst__privstruct_parse(key, DST_ALG_DSA, lexer, mctx, &priv);
394 if (ret != ISC_R_SUCCESS)
399 DST_RET(ISC_R_NOMEMORY);
400 dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
401 key->keydata.dsa = dsa;
403 for (i=0; i < priv.nelements; i++) {
405 bn = BN_bin2bn(priv.elements[i].data,
406 priv.elements[i].length, NULL);
408 DST_RET(ISC_R_NOMEMORY);
410 switch (priv.elements[i].tag) {
414 case TAG_DSA_SUBPRIME:
420 case TAG_DSA_PRIVATE:
428 dst__privstruct_free(&priv, mctx);
430 key->key_size = BN_num_bits(dsa->p);
432 return (ISC_R_SUCCESS);
435 openssldsa_destroy(key);
436 dst__privstruct_free(&priv, mctx);
437 memset(&priv, 0, sizeof(priv));
441 static dst_func_t openssldsa_functions = {
442 openssldsa_createctx,
443 openssldsa_destroyctx,
447 NULL, /*%< computesecret */
449 NULL, /*%< paramcompare */
451 openssldsa_isprivate,
457 NULL, /*%< cleanup */
461 dst__openssldsa_init(dst_func_t **funcp) {
462 REQUIRE(funcp != NULL);
464 *funcp = &openssldsa_functions;
465 return (ISC_R_SUCCESS);
470 #include <isc/util.h>
472 EMPTY_TRANSLATION_UNIT