2 * Portions Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC")
3 * Portions Copyright (C) 1999-2002 Internet Software Consortium.
4 * Portions Copyright (C) 1995-2000 by Network Associates, Inc.
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12 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE
13 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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19 /* $Id: openssldsa_link.c,v 1.1.6.9.28.1 2008/12/24 00:21:22 marka Exp $ */
27 #include <isc/entropy.h>
32 #include <dst/result.h>
34 #include "dst_internal.h"
35 #include "dst_openssl.h"
36 #include "dst_parse.h"
38 #include <openssl/dsa.h>
40 static isc_result_t openssldsa_todns(const dst_key_t *key, isc_buffer_t *data);
43 openssldsa_createctx(dst_key_t *key, dst_context_t *dctx) {
48 sha1ctx = isc_mem_get(dctx->mctx, sizeof(isc_sha1_t));
49 isc_sha1_init(sha1ctx);
50 dctx->opaque = sha1ctx;
51 return (ISC_R_SUCCESS);
55 openssldsa_destroyctx(dst_context_t *dctx) {
56 isc_sha1_t *sha1ctx = dctx->opaque;
58 if (sha1ctx != NULL) {
59 isc_sha1_invalidate(sha1ctx);
60 isc_mem_put(dctx->mctx, sha1ctx, sizeof(isc_sha1_t));
66 openssldsa_adddata(dst_context_t *dctx, const isc_region_t *data) {
67 isc_sha1_t *sha1ctx = dctx->opaque;
69 isc_sha1_update(sha1ctx, data->base, data->length);
70 return (ISC_R_SUCCESS);
74 BN_bn2bin_fixed(BIGNUM *bn, unsigned char *buf, int size) {
75 int bytes = size - BN_num_bytes(bn);
83 openssldsa_sign(dst_context_t *dctx, isc_buffer_t *sig) {
84 isc_sha1_t *sha1ctx = dctx->opaque;
85 dst_key_t *key = dctx->key;
86 DSA *dsa = key->opaque;
89 unsigned char digest[ISC_SHA1_DIGESTLENGTH];
91 isc_buffer_availableregion(sig, &r);
92 if (r.length < ISC_SHA1_DIGESTLENGTH * 2 + 1)
93 return (ISC_R_NOSPACE);
95 isc_sha1_final(sha1ctx, digest);
97 dsasig = DSA_do_sign(digest, ISC_SHA1_DIGESTLENGTH, dsa);
99 return (dst__openssl_toresult(DST_R_SIGNFAILURE));
101 *r.base++ = (key->key_size - 512)/64;
102 BN_bn2bin_fixed(dsasig->r, r.base, ISC_SHA1_DIGESTLENGTH);
103 r.base += ISC_SHA1_DIGESTLENGTH;
104 BN_bn2bin_fixed(dsasig->s, r.base, ISC_SHA1_DIGESTLENGTH);
105 r.base += ISC_SHA1_DIGESTLENGTH;
106 DSA_SIG_free(dsasig);
107 isc_buffer_add(sig, ISC_SHA1_DIGESTLENGTH * 2 + 1);
109 return (ISC_R_SUCCESS);
113 openssldsa_verify(dst_context_t *dctx, const isc_region_t *sig) {
114 isc_sha1_t *sha1ctx = dctx->opaque;
115 dst_key_t *key = dctx->key;
116 DSA *dsa = key->opaque;
119 unsigned char digest[ISC_SHA1_DIGESTLENGTH];
120 unsigned char *cp = sig->base;
122 isc_sha1_final(sha1ctx, digest);
124 if (sig->length < 2 * ISC_SHA1_DIGESTLENGTH + 1)
125 return (DST_R_VERIFYFAILURE);
128 dsasig = DSA_SIG_new();
129 dsasig->r = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
130 cp += ISC_SHA1_DIGESTLENGTH;
131 dsasig->s = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
132 cp += ISC_SHA1_DIGESTLENGTH;
134 status = DSA_do_verify(digest, ISC_SHA1_DIGESTLENGTH, dsasig, dsa);
135 DSA_SIG_free(dsasig);
137 return (dst__openssl_toresult(DST_R_VERIFYFAILURE));
139 return (ISC_R_SUCCESS);
143 openssldsa_compare(const dst_key_t *key1, const dst_key_t *key2) {
147 dsa1 = (DSA *) key1->opaque;
148 dsa2 = (DSA *) key2->opaque;
150 if (dsa1 == NULL && dsa2 == NULL)
152 else if (dsa1 == NULL || dsa2 == NULL)
155 status = BN_cmp(dsa1->p, dsa2->p) ||
156 BN_cmp(dsa1->q, dsa2->q) ||
157 BN_cmp(dsa1->g, dsa2->g) ||
158 BN_cmp(dsa1->pub_key, dsa2->pub_key);
163 if (dsa1->priv_key != NULL || dsa2->priv_key != NULL) {
164 if (dsa1->priv_key == NULL || dsa2->priv_key == NULL)
166 if (BN_cmp(dsa1->priv_key, dsa2->priv_key))
173 openssldsa_generate(dst_key_t *key, int unused) {
174 #if OPENSSL_VERSION_NUMBER > 0x00908000L
178 unsigned char rand_array[ISC_SHA1_DIGESTLENGTH];
183 result = dst__entropy_getdata(rand_array, sizeof(rand_array),
185 if (result != ISC_R_SUCCESS)
188 #if OPENSSL_VERSION_NUMBER > 0x00908000L
191 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
193 BN_GENCB_set_old(&cb, NULL, NULL);
195 if (!DSA_generate_parameters_ex(dsa, key->key_size, rand_array,
196 ISC_SHA1_DIGESTLENGTH, NULL, NULL,
200 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
203 dsa = DSA_generate_parameters(key->key_size, rand_array,
204 ISC_SHA1_DIGESTLENGTH, NULL, NULL,
207 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
210 if (DSA_generate_key(dsa) == 0) {
212 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
214 dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
218 return (ISC_R_SUCCESS);
222 openssldsa_isprivate(const dst_key_t *key) {
223 DSA *dsa = (DSA *) key->opaque;
224 return (ISC_TF(dsa != NULL && dsa->priv_key != NULL));
228 openssldsa_destroy(dst_key_t *key) {
229 DSA *dsa = key->opaque;
236 openssldsa_todns(const dst_key_t *key, isc_buffer_t *data) {
240 unsigned int t, p_bytes;
242 REQUIRE(key->opaque != NULL);
244 dsa = (DSA *) key->opaque;
246 isc_buffer_availableregion(data, &r);
248 t = (BN_num_bytes(dsa->p) - 64) / 8;
250 return (DST_R_INVALIDPUBLICKEY);
251 p_bytes = 64 + 8 * t;
253 dnslen = 1 + (key->key_size * 3)/8 + ISC_SHA1_DIGESTLENGTH;
254 if (r.length < (unsigned int) dnslen)
255 return (ISC_R_NOSPACE);
258 BN_bn2bin_fixed(dsa->q, r.base, ISC_SHA1_DIGESTLENGTH);
259 r.base += ISC_SHA1_DIGESTLENGTH;
260 BN_bn2bin_fixed(dsa->p, r.base, key->key_size/8);
262 BN_bn2bin_fixed(dsa->g, r.base, key->key_size/8);
264 BN_bn2bin_fixed(dsa->pub_key, r.base, key->key_size/8);
267 isc_buffer_add(data, dnslen);
269 return (ISC_R_SUCCESS);
273 openssldsa_fromdns(dst_key_t *key, isc_buffer_t *data) {
276 unsigned int t, p_bytes;
277 isc_mem_t *mctx = key->mctx;
281 isc_buffer_remainingregion(data, &r);
283 return (ISC_R_SUCCESS);
287 return (ISC_R_NOMEMORY);
288 dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
290 t = (unsigned int) *r.base++;
293 return (DST_R_INVALIDPUBLICKEY);
295 p_bytes = 64 + 8 * t;
297 if (r.length < 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes) {
299 return (DST_R_INVALIDPUBLICKEY);
302 dsa->q = BN_bin2bn(r.base, ISC_SHA1_DIGESTLENGTH, NULL);
303 r.base += ISC_SHA1_DIGESTLENGTH;
305 dsa->p = BN_bin2bn(r.base, p_bytes, NULL);
308 dsa->g = BN_bin2bn(r.base, p_bytes, NULL);
311 dsa->pub_key = BN_bin2bn(r.base, p_bytes, NULL);
314 key->key_size = p_bytes * 8;
316 isc_buffer_forward(data, 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes);
318 key->opaque = (void *) dsa;
320 return (ISC_R_SUCCESS);
325 openssldsa_tofile(const dst_key_t *key, const char *directory) {
329 unsigned char bufs[5][128];
331 if (key->opaque == NULL)
332 return (DST_R_NULLKEY);
334 dsa = (DSA *) key->opaque;
336 priv.elements[cnt].tag = TAG_DSA_PRIME;
337 priv.elements[cnt].length = BN_num_bytes(dsa->p);
338 BN_bn2bin(dsa->p, bufs[cnt]);
339 priv.elements[cnt].data = bufs[cnt];
342 priv.elements[cnt].tag = TAG_DSA_SUBPRIME;
343 priv.elements[cnt].length = BN_num_bytes(dsa->q);
344 BN_bn2bin(dsa->q, bufs[cnt]);
345 priv.elements[cnt].data = bufs[cnt];
348 priv.elements[cnt].tag = TAG_DSA_BASE;
349 priv.elements[cnt].length = BN_num_bytes(dsa->g);
350 BN_bn2bin(dsa->g, bufs[cnt]);
351 priv.elements[cnt].data = bufs[cnt];
354 priv.elements[cnt].tag = TAG_DSA_PRIVATE;
355 priv.elements[cnt].length = BN_num_bytes(dsa->priv_key);
356 BN_bn2bin(dsa->priv_key, bufs[cnt]);
357 priv.elements[cnt].data = bufs[cnt];
360 priv.elements[cnt].tag = TAG_DSA_PUBLIC;
361 priv.elements[cnt].length = BN_num_bytes(dsa->pub_key);
362 BN_bn2bin(dsa->pub_key, bufs[cnt]);
363 priv.elements[cnt].data = bufs[cnt];
366 priv.nelements = cnt;
367 return (dst__privstruct_writefile(key, &priv, directory));
371 openssldsa_parse(dst_key_t *key, isc_lex_t *lexer) {
376 isc_mem_t *mctx = key->mctx;
377 #define DST_RET(a) {ret = a; goto err;}
379 /* read private key file */
380 ret = dst__privstruct_parse(key, DST_ALG_DSA, lexer, mctx, &priv);
381 if (ret != ISC_R_SUCCESS)
386 DST_RET(ISC_R_NOMEMORY);
387 dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
390 for (i=0; i < priv.nelements; i++) {
392 bn = BN_bin2bn(priv.elements[i].data,
393 priv.elements[i].length, NULL);
395 DST_RET(ISC_R_NOMEMORY);
397 switch (priv.elements[i].tag) {
401 case TAG_DSA_SUBPRIME:
407 case TAG_DSA_PRIVATE:
415 dst__privstruct_free(&priv, mctx);
417 key->key_size = BN_num_bits(dsa->p);
419 return (ISC_R_SUCCESS);
422 openssldsa_destroy(key);
423 dst__privstruct_free(&priv, mctx);
424 memset(&priv, 0, sizeof(priv));
428 static dst_func_t openssldsa_functions = {
429 openssldsa_createctx,
430 openssldsa_destroyctx,
434 NULL, /*%< computesecret */
436 NULL, /*%< paramcompare */
438 openssldsa_isprivate,
444 NULL, /*%< cleanup */
448 dst__openssldsa_init(dst_func_t **funcp) {
449 REQUIRE(funcp != NULL);
451 *funcp = &openssldsa_functions;
452 return (ISC_R_SUCCESS);
457 #include <isc/util.h>
459 EMPTY_TRANSLATION_UNIT