contrib/bind9/lib/dns/openssldsa_link.c

   1 /*
   2  * Portions Copyright (C) 2004-2009, 2011, 2012  Internet Systems Consortium, Inc. ("ISC")
   3  * Portions Copyright (C) 1999-2002  Internet Software Consortium.
   4  *
   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.
   8  *
   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.
  16  *
  17  * Portions Copyright (C) 1995-2000 by Network Associates, Inc.
  18  *
  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.
  22  *
  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.
  30  */
  31
  32 /* $Id$ */
  33
  34 #ifdef OPENSSL
  35 #ifndef USE_EVP
  36 #define USE_EVP 1
  37 #endif
  38
  39 #include <config.h>
  40
  41 #include <string.h>
  42
  43 #include <isc/entropy.h>
  44 #include <isc/mem.h>
  45 #include <isc/sha1.h>
  46 #include <isc/util.h>
  47
  48 #include <dst/result.h>
  49
  50 #include "dst_internal.h"
  51 #include "dst_openssl.h"
  52 #include "dst_parse.h"
  53
  54 #include <openssl/dsa.h>
  55
  56 static isc_result_t openssldsa_todns(const dst_key_t *key, isc_buffer_t *data);
  57
  58 static isc_result_t
  59 openssldsa_createctx(dst_key_t *key, dst_context_t *dctx) {
  60 #if USE_EVP
  61         EVP_MD_CTX *evp_md_ctx;
  62
  63         UNUSED(key);
  64
  65         evp_md_ctx = EVP_MD_CTX_create();
  66         if (evp_md_ctx == NULL)
  67                 return (ISC_R_NOMEMORY);
  68
  69         if (!EVP_DigestInit_ex(evp_md_ctx, EVP_dss1(), NULL)) {
  70                 EVP_MD_CTX_destroy(evp_md_ctx);
  71                         return (ISC_R_FAILURE);
  72         }
  73
  74         dctx->ctxdata.evp_md_ctx = evp_md_ctx;
  75
  76         return (ISC_R_SUCCESS);
  77 #else
  78         isc_sha1_t *sha1ctx;
  79
  80         UNUSED(key);
  81
  82         sha1ctx = isc_mem_get(dctx->mctx, sizeof(isc_sha1_t));
  83         isc_sha1_init(sha1ctx);
  84         dctx->ctxdata.sha1ctx = sha1ctx;
  85         return (ISC_R_SUCCESS);
  86 #endif
  87 }
  88
  89 static void
  90 openssldsa_destroyctx(dst_context_t *dctx) {
  91 #if USE_EVP
  92         EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;
  93
  94         if (evp_md_ctx != NULL) {
  95                 EVP_MD_CTX_destroy(evp_md_ctx);
  96                 dctx->ctxdata.evp_md_ctx = NULL;
  97         }
  98 #else
  99         isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
 100
 101         if (sha1ctx != NULL) {
 102                 isc_sha1_invalidate(sha1ctx);
 103                 isc_mem_put(dctx->mctx, sha1ctx, sizeof(isc_sha1_t));
 104                 dctx->ctxdata.sha1ctx = NULL;
 105         }
 106 #endif
 107 }
 108
 109 static isc_result_t
 110 openssldsa_adddata(dst_context_t *dctx, const isc_region_t *data) {
 111 #if USE_EVP
 112         EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;
 113
 114         if (!EVP_DigestUpdate(evp_md_ctx, data->base, data->length)) {
 115                 return (ISC_R_FAILURE);
 116         }
 117 #else
 118         isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
 119
 120         isc_sha1_update(sha1ctx, data->base, data->length);
 121 #endif
 122         return (ISC_R_SUCCESS);
 123 }
 124
 125 static int
 126 BN_bn2bin_fixed(BIGNUM *bn, unsigned char *buf, int size) {
 127         int bytes = size - BN_num_bytes(bn);
 128         while (bytes-- > 0)
 129                 *buf++ = 0;
 130         BN_bn2bin(bn, buf);
 131         return (size);
 132 }
 133
 134 static isc_result_t
 135 openssldsa_sign(dst_context_t *dctx, isc_buffer_t *sig) {
 136         dst_key_t *key = dctx->key;
 137         DSA *dsa = key->keydata.dsa;
 138         isc_region_t r;
 139         DSA_SIG *dsasig;
 140 #if USE_EVP
 141         EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;
 142         EVP_PKEY *pkey;
 143         unsigned char *sigbuf;
 144         const unsigned char *sb;
 145         unsigned int siglen;
 146 #else
 147         isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
 148         unsigned char digest[ISC_SHA1_DIGESTLENGTH];
 149 #endif
 150
 151         isc_buffer_availableregion(sig, &r);
 152         if (r.length < ISC_SHA1_DIGESTLENGTH * 2 + 1)
 153                 return (ISC_R_NOSPACE);
 154
 155 #if USE_EVP
 156         pkey = EVP_PKEY_new();
 157         if (pkey == NULL)
 158                 return (ISC_R_NOMEMORY);
 159         if (!EVP_PKEY_set1_DSA(pkey, dsa)) {
 160                 EVP_PKEY_free(pkey);
 161                 return (ISC_R_FAILURE);
 162         }
 163         sigbuf = malloc(EVP_PKEY_size(pkey));
 164         if (sigbuf == NULL) {
 165                 EVP_PKEY_free(pkey);
 166                 return (ISC_R_NOMEMORY);
 167         }
 168         if (!EVP_SignFinal(evp_md_ctx, sigbuf, &siglen, pkey)) {
 169                 EVP_PKEY_free(pkey);
 170                 free(sigbuf);
 171                 return (dst__openssl_toresult2("EVP_SignFinal",
 172                                                ISC_R_FAILURE));
 173         }
 174         INSIST(EVP_PKEY_size(pkey) >= (int) siglen);
 175         EVP_PKEY_free(pkey);
 176         /* Convert from Dss-Sig-Value (RFC2459). */
 177         dsasig = DSA_SIG_new();
 178         if (dsasig == NULL) {
 179                 free(sigbuf);
 180                 return (ISC_R_NOMEMORY);
 181         }
 182         sb = sigbuf;
 183         if (d2i_DSA_SIG(&dsasig, &sb, (long) siglen) == NULL) {
 184                 free(sigbuf);
 185                 return (dst__openssl_toresult2("d2i_DSA_SIG", ISC_R_FAILURE));
 186         }
 187         free(sigbuf);
 188 #elif 0
 189         /* Only use EVP for the Digest */
 190         if (!EVP_DigestFinal_ex(evp_md_ctx, digest, &siglen)) {
 191                 return (dst__openssl_toresult2("EVP_DigestFinal_ex",
 192                                                ISC_R_FAILURE));
 193         }
 194         dsasig = DSA_do_sign(digest, ISC_SHA1_DIGESTLENGTH, dsa);
 195         if (dsasig == NULL)
 196                 return (dst__openssl_toresult2("DSA_do_sign",
 197                                                DST_R_SIGNFAILURE));
 198 #else
 199         isc_sha1_final(sha1ctx, digest);
 200
 201         dsasig = DSA_do_sign(digest, ISC_SHA1_DIGESTLENGTH, dsa);
 202         if (dsasig == NULL)
 203                 return (dst__openssl_toresult2("DSA_do_sign",
 204                                                DST_R_SIGNFAILURE));
 205 #endif
 206         *r.base++ = (key->key_size - 512)/64;
 207         BN_bn2bin_fixed(dsasig->r, r.base, ISC_SHA1_DIGESTLENGTH);
 208         r.base += ISC_SHA1_DIGESTLENGTH;
 209         BN_bn2bin_fixed(dsasig->s, r.base, ISC_SHA1_DIGESTLENGTH);
 210         r.base += ISC_SHA1_DIGESTLENGTH;
 211         DSA_SIG_free(dsasig);
 212         isc_buffer_add(sig, ISC_SHA1_DIGESTLENGTH * 2 + 1);
 213
 214         return (ISC_R_SUCCESS);
 215 }
 216
 217 static isc_result_t
 218 openssldsa_verify(dst_context_t *dctx, const isc_region_t *sig) {
 219         dst_key_t *key = dctx->key;
 220         DSA *dsa = key->keydata.dsa;
 221         int status = 0;
 222         unsigned char *cp = sig->base;
 223         DSA_SIG *dsasig;
 224 #if USE_EVP
 225         EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;
 226 #if 0
 227         EVP_PKEY *pkey;
 228         unsigned char *sigbuf;
 229 #endif
 230         unsigned int siglen;
 231 #else
 232         isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
 233 #endif
 234         unsigned char digest[ISC_SHA1_DIGESTLENGTH];
 235
 236
 237 #if USE_EVP
 238 #if 1
 239         /* Only use EVP for the digest */
 240         if (!EVP_DigestFinal_ex(evp_md_ctx, digest, &siglen)) {
 241                 return (ISC_R_FAILURE);
 242         }
 243 #endif
 244 #else
 245         isc_sha1_final(sha1ctx, digest);
 246 #endif
 247
 248         if (sig->length != 2 * ISC_SHA1_DIGESTLENGTH + 1) {
 249                 return (DST_R_VERIFYFAILURE);
 250         }
 251
 252         cp++;   /*%< Skip T */
 253         dsasig = DSA_SIG_new();
 254         if (dsasig == NULL)
 255                 return (ISC_R_NOMEMORY);
 256         dsasig->r = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
 257         cp += ISC_SHA1_DIGESTLENGTH;
 258         dsasig->s = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
 259
 260 #if 0
 261         pkey = EVP_PKEY_new();
 262         if (pkey == NULL)
 263                 return (ISC_R_NOMEMORY);
 264         if (!EVP_PKEY_set1_DSA(pkey, dsa)) {
 265                 EVP_PKEY_free(pkey);
 266                 return (ISC_R_FAILURE);
 267         }
 268         /* Convert to Dss-Sig-Value (RFC2459). */
 269         sigbuf = malloc(EVP_PKEY_size(pkey) + 50);
 270         if (sigbuf == NULL) {
 271                 EVP_PKEY_free(pkey);
 272                 return (ISC_R_NOMEMORY);
 273         }
 274         siglen = (unsigned) i2d_DSA_SIG(dsasig, &sigbuf);
 275         INSIST(EVP_PKEY_size(pkey) >= (int) siglen);
 276         status = EVP_VerifyFinal(evp_md_ctx, sigbuf, siglen, pkey);
 277         EVP_PKEY_free(pkey);
 278         free(sigbuf);
 279 #else
 280         status = DSA_do_verify(digest, ISC_SHA1_DIGESTLENGTH, dsasig, dsa);
 281 #endif
 282         DSA_SIG_free(dsasig);
 283         switch (status) {
 284         case 1:
 285                 return (ISC_R_SUCCESS);
 286         case 0:
 287                 return (dst__openssl_toresult(DST_R_VERIFYFAILURE));
 288         default:
 289                 return (dst__openssl_toresult2("DSA_do_verify",
 290                                                DST_R_VERIFYFAILURE));
 291         }
 292 }
 293
 294 static isc_boolean_t
 295 openssldsa_compare(const dst_key_t *key1, const dst_key_t *key2) {
 296         int status;
 297         DSA *dsa1, *dsa2;
 298
 299         dsa1 = key1->keydata.dsa;
 300         dsa2 = key2->keydata.dsa;
 301
 302         if (dsa1 == NULL && dsa2 == NULL)
 303                 return (ISC_TRUE);
 304         else if (dsa1 == NULL || dsa2 == NULL)
 305                 return (ISC_FALSE);
 306
 307         status = BN_cmp(dsa1->p, dsa2->p) ||
 308                  BN_cmp(dsa1->q, dsa2->q) ||
 309                  BN_cmp(dsa1->g, dsa2->g) ||
 310                  BN_cmp(dsa1->pub_key, dsa2->pub_key);
 311
 312         if (status != 0)
 313                 return (ISC_FALSE);
 314
 315         if (dsa1->priv_key != NULL || dsa2->priv_key != NULL) {
 316                 if (dsa1->priv_key == NULL || dsa2->priv_key == NULL)
 317                         return (ISC_FALSE);
 318                 if (BN_cmp(dsa1->priv_key, dsa2->priv_key))
 319                         return (ISC_FALSE);
 320         }
 321         return (ISC_TRUE);
 322 }
 323
 324 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 325 static int
 326 progress_cb(int p, int n, BN_GENCB *cb)
 327 {
 328         union {
 329                 void *dptr;
 330                 void (*fptr)(int);
 331         } u;
 332
 333         UNUSED(n);
 334
 335         u.dptr = cb->arg;
 336         if (u.fptr != NULL)
 337                 u.fptr(p);
 338         return (1);
 339 }
 340 #endif
 341
 342 static isc_result_t
 343 openssldsa_generate(dst_key_t *key, int unused, void (*callback)(int)) {
 344         DSA *dsa;
 345         unsigned char rand_array[ISC_SHA1_DIGESTLENGTH];
 346         isc_result_t result;
 347 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 348         BN_GENCB cb;
 349         union {
 350                 void *dptr;
 351                 void (*fptr)(int);
 352         } u;
 353
 354 #else
 355
 356         UNUSED(callback);
 357 #endif
 358         UNUSED(unused);
 359
 360         result = dst__entropy_getdata(rand_array, sizeof(rand_array),
 361                                       ISC_FALSE);
 362         if (result != ISC_R_SUCCESS)
 363                 return (result);
 364
 365 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 366         dsa = DSA_new();
 367         if (dsa == NULL)
 368                 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
 369
 370         if (callback == NULL) {
 371                 BN_GENCB_set_old(&cb, NULL, NULL);
 372         } else {
 373                 u.fptr = callback;
 374                 BN_GENCB_set(&cb, &progress_cb, u.dptr);
 375         }
 376
 377         if (!DSA_generate_parameters_ex(dsa, key->key_size, rand_array,
 378                                         ISC_SHA1_DIGESTLENGTH,  NULL, NULL,
 379                                         &cb))
 380         {
 381                 DSA_free(dsa);
 382                 return (dst__openssl_toresult2("DSA_generate_parameters_ex",
 383                                                DST_R_OPENSSLFAILURE));
 384         }
 385 #else
 386         dsa = DSA_generate_parameters(key->key_size, rand_array,
 387                                       ISC_SHA1_DIGESTLENGTH, NULL, NULL,
 388                                       NULL, NULL);
 389         if (dsa == NULL)
 390                 return (dst__openssl_toresult2("DSA_generate_parameters",
 391                                                DST_R_OPENSSLFAILURE));
 392 #endif
 393
 394         if (DSA_generate_key(dsa) == 0) {
 395                 DSA_free(dsa);
 396                 return (dst__openssl_toresult2("DSA_generate_key",
 397                                                DST_R_OPENSSLFAILURE));
 398         }
 399         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 400
 401         key->keydata.dsa = dsa;
 402
 403         return (ISC_R_SUCCESS);
 404 }
 405
 406 static isc_boolean_t
 407 openssldsa_isprivate(const dst_key_t *key) {
 408         DSA *dsa = key->keydata.dsa;
 409         return (ISC_TF(dsa != NULL && dsa->priv_key != NULL));
 410 }
 411
 412 static void
 413 openssldsa_destroy(dst_key_t *key) {
 414         DSA *dsa = key->keydata.dsa;
 415         DSA_free(dsa);
 416         key->keydata.dsa = NULL;
 417 }
 418
 419
 420 static isc_result_t
 421 openssldsa_todns(const dst_key_t *key, isc_buffer_t *data) {
 422         DSA *dsa;
 423         isc_region_t r;
 424         int dnslen;
 425         unsigned int t, p_bytes;
 426
 427         REQUIRE(key->keydata.dsa != NULL);
 428
 429         dsa = key->keydata.dsa;
 430
 431         isc_buffer_availableregion(data, &r);
 432
 433         t = (BN_num_bytes(dsa->p) - 64) / 8;
 434         if (t > 8)
 435                 return (DST_R_INVALIDPUBLICKEY);
 436         p_bytes = 64 + 8 * t;
 437
 438         dnslen = 1 + (key->key_size * 3)/8 + ISC_SHA1_DIGESTLENGTH;
 439         if (r.length < (unsigned int) dnslen)
 440                 return (ISC_R_NOSPACE);
 441
 442         *r.base++ = t;
 443         BN_bn2bin_fixed(dsa->q, r.base, ISC_SHA1_DIGESTLENGTH);
 444         r.base += ISC_SHA1_DIGESTLENGTH;
 445         BN_bn2bin_fixed(dsa->p, r.base, key->key_size/8);
 446         r.base += p_bytes;
 447         BN_bn2bin_fixed(dsa->g, r.base, key->key_size/8);
 448         r.base += p_bytes;
 449         BN_bn2bin_fixed(dsa->pub_key, r.base, key->key_size/8);
 450         r.base += p_bytes;
 451
 452         isc_buffer_add(data, dnslen);
 453
 454         return (ISC_R_SUCCESS);
 455 }
 456
 457 static isc_result_t
 458 openssldsa_fromdns(dst_key_t *key, isc_buffer_t *data) {
 459         DSA *dsa;
 460         isc_region_t r;
 461         unsigned int t, p_bytes;
 462         isc_mem_t *mctx = key->mctx;
 463
 464         UNUSED(mctx);
 465
 466         isc_buffer_remainingregion(data, &r);
 467         if (r.length == 0)
 468                 return (ISC_R_SUCCESS);
 469
 470         dsa = DSA_new();
 471         if (dsa == NULL)
 472                 return (ISC_R_NOMEMORY);
 473         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 474
 475         t = (unsigned int) *r.base++;
 476         if (t > 8) {
 477                 DSA_free(dsa);
 478                 return (DST_R_INVALIDPUBLICKEY);
 479         }
 480         p_bytes = 64 + 8 * t;
 481
 482         if (r.length < 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes) {
 483                 DSA_free(dsa);
 484                 return (DST_R_INVALIDPUBLICKEY);
 485         }
 486
 487         dsa->q = BN_bin2bn(r.base, ISC_SHA1_DIGESTLENGTH, NULL);
 488         r.base += ISC_SHA1_DIGESTLENGTH;
 489
 490         dsa->p = BN_bin2bn(r.base, p_bytes, NULL);
 491         r.base += p_bytes;
 492
 493         dsa->g = BN_bin2bn(r.base, p_bytes, NULL);
 494         r.base += p_bytes;
 495
 496         dsa->pub_key = BN_bin2bn(r.base, p_bytes, NULL);
 497         r.base += p_bytes;
 498
 499         key->key_size = p_bytes * 8;
 500
 501         isc_buffer_forward(data, 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes);
 502
 503         key->keydata.dsa = dsa;
 504
 505         return (ISC_R_SUCCESS);
 506 }
 507
 508
 509 static isc_result_t
 510 openssldsa_tofile(const dst_key_t *key, const char *directory) {
 511         int cnt = 0;
 512         DSA *dsa;
 513         dst_private_t priv;
 514         unsigned char bufs[5][128];
 515
 516         if (key->keydata.dsa == NULL)
 517                 return (DST_R_NULLKEY);
 518
 519         dsa = key->keydata.dsa;
 520
 521         priv.elements[cnt].tag = TAG_DSA_PRIME;
 522         priv.elements[cnt].length = BN_num_bytes(dsa->p);
 523         BN_bn2bin(dsa->p, bufs[cnt]);
 524         priv.elements[cnt].data = bufs[cnt];
 525         cnt++;
 526
 527         priv.elements[cnt].tag = TAG_DSA_SUBPRIME;
 528         priv.elements[cnt].length = BN_num_bytes(dsa->q);
 529         BN_bn2bin(dsa->q, bufs[cnt]);
 530         priv.elements[cnt].data = bufs[cnt];
 531         cnt++;
 532
 533         priv.elements[cnt].tag = TAG_DSA_BASE;
 534         priv.elements[cnt].length = BN_num_bytes(dsa->g);
 535         BN_bn2bin(dsa->g, bufs[cnt]);
 536         priv.elements[cnt].data = bufs[cnt];
 537         cnt++;
 538
 539         priv.elements[cnt].tag = TAG_DSA_PRIVATE;
 540         priv.elements[cnt].length = BN_num_bytes(dsa->priv_key);
 541         BN_bn2bin(dsa->priv_key, bufs[cnt]);
 542         priv.elements[cnt].data = bufs[cnt];
 543         cnt++;
 544
 545         priv.elements[cnt].tag = TAG_DSA_PUBLIC;
 546         priv.elements[cnt].length = BN_num_bytes(dsa->pub_key);
 547         BN_bn2bin(dsa->pub_key, bufs[cnt]);
 548         priv.elements[cnt].data = bufs[cnt];
 549         cnt++;
 550
 551         priv.nelements = cnt;
 552         return (dst__privstruct_writefile(key, &priv, directory));
 553 }
 554
 555 static isc_result_t
 556 openssldsa_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) {
 557         dst_private_t priv;
 558         isc_result_t ret;
 559         int i;
 560         DSA *dsa = NULL;
 561         isc_mem_t *mctx = key->mctx;
 562 #define DST_RET(a) {ret = a; goto err;}
 563
 564         UNUSED(pub);
 565         /* read private key file */
 566         ret = dst__privstruct_parse(key, DST_ALG_DSA, lexer, mctx, &priv);
 567         if (ret != ISC_R_SUCCESS)
 568                 return (ret);
 569
 570         dsa = DSA_new();
 571         if (dsa == NULL)
 572                 DST_RET(ISC_R_NOMEMORY);
 573         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 574         key->keydata.dsa = dsa;
 575
 576         for (i=0; i < priv.nelements; i++) {
 577                 BIGNUM *bn;
 578                 bn = BN_bin2bn(priv.elements[i].data,
 579                                priv.elements[i].length, NULL);
 580                 if (bn == NULL)
 581                         DST_RET(ISC_R_NOMEMORY);
 582
 583                 switch (priv.elements[i].tag) {
 584                         case TAG_DSA_PRIME:
 585                                 dsa->p = bn;
 586                                 break;
 587                         case TAG_DSA_SUBPRIME:
 588                                 dsa->q = bn;
 589                                 break;
 590                         case TAG_DSA_BASE:
 591                                 dsa->g = bn;
 592                                 break;
 593                         case TAG_DSA_PRIVATE:
 594                                 dsa->priv_key = bn;
 595                                 break;
 596                         case TAG_DSA_PUBLIC:
 597                                 dsa->pub_key = bn;
 598                                 break;
 599                 }
 600         }
 601         dst__privstruct_free(&priv, mctx);
 602
 603         key->key_size = BN_num_bits(dsa->p);
 604
 605         return (ISC_R_SUCCESS);
 606
 607  err:
 608         openssldsa_destroy(key);
 609         dst__privstruct_free(&priv, mctx);
 610         memset(&priv, 0, sizeof(priv));
 611         return (ret);
 612 }
 613
 614 static dst_func_t openssldsa_functions = {
 615         openssldsa_createctx,
 616         openssldsa_destroyctx,
 617         openssldsa_adddata,
 618         openssldsa_sign,
 619         openssldsa_verify,
 620         NULL, /*%< computesecret */
 621         openssldsa_compare,
 622         NULL, /*%< paramcompare */
 623         openssldsa_generate,
 624         openssldsa_isprivate,
 625         openssldsa_destroy,
 626         openssldsa_todns,
 627         openssldsa_fromdns,
 628         openssldsa_tofile,
 629         openssldsa_parse,
 630         NULL, /*%< cleanup */
 631         NULL, /*%< fromlabel */
 632         NULL, /*%< dump */
 633         NULL, /*%< restore */
 634 };
 635
 636 isc_result_t
 637 dst__openssldsa_init(dst_func_t **funcp) {
 638         REQUIRE(funcp != NULL);
 639         if (*funcp == NULL)
 640                 *funcp = &openssldsa_functions;
 641         return (ISC_R_SUCCESS);
 642 }
 643
 644 #else /* OPENSSL */
 645
 646 #include <isc/util.h>
 647
 648 EMPTY_TRANSLATION_UNIT
 649
 650 #endif /* OPENSSL */
 651 /*! \file */