contrib/bind9/lib/dns/openssldsa_link.c

   1 /*
   2  * Portions Copyright (C) 2004-2009, 2011  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: openssldsa_link.c,v 1.20.10.1 2011-03-11 06:47:04 marka Exp $ */
  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 (ISC_R_FAILURE);
 172         }
 173         INSIST(EVP_PKEY_size(pkey) >= (int) siglen);
 174         EVP_PKEY_free(pkey);
 175         /* Convert from Dss-Sig-Value (RFC2459). */
 176         dsasig = DSA_SIG_new();
 177         if (dsasig == NULL) {
 178                 free(sigbuf);
 179                 return (ISC_R_NOMEMORY);
 180         }
 181         sb = sigbuf;
 182         if (d2i_DSA_SIG(&dsasig, &sb, (long) siglen) == NULL) {
 183                 free(sigbuf);
 184                 return (ISC_R_FAILURE);
 185         }
 186         free(sigbuf);
 187 #elif 0
 188         /* Only use EVP for the Digest */
 189         if (!EVP_DigestFinal_ex(evp_md_ctx, digest, &siglen)) {
 190                 return (ISC_R_FAILURE);
 191         }
 192         dsasig = DSA_do_sign(digest, ISC_SHA1_DIGESTLENGTH, dsa);
 193         if (dsasig == NULL)
 194                 return (dst__openssl_toresult(DST_R_SIGNFAILURE));
 195 #else
 196         isc_sha1_final(sha1ctx, digest);
 197
 198         dsasig = DSA_do_sign(digest, ISC_SHA1_DIGESTLENGTH, dsa);
 199         if (dsasig == NULL)
 200                 return (dst__openssl_toresult(DST_R_SIGNFAILURE));
 201 #endif
 202         *r.base++ = (key->key_size - 512)/64;
 203         BN_bn2bin_fixed(dsasig->r, r.base, ISC_SHA1_DIGESTLENGTH);
 204         r.base += ISC_SHA1_DIGESTLENGTH;
 205         BN_bn2bin_fixed(dsasig->s, r.base, ISC_SHA1_DIGESTLENGTH);
 206         r.base += ISC_SHA1_DIGESTLENGTH;
 207         DSA_SIG_free(dsasig);
 208         isc_buffer_add(sig, ISC_SHA1_DIGESTLENGTH * 2 + 1);
 209
 210         return (ISC_R_SUCCESS);
 211 }
 212
 213 static isc_result_t
 214 openssldsa_verify(dst_context_t *dctx, const isc_region_t *sig) {
 215         dst_key_t *key = dctx->key;
 216         DSA *dsa = key->keydata.dsa;
 217         int status = 0;
 218         unsigned char *cp = sig->base;
 219         DSA_SIG *dsasig;
 220 #if USE_EVP
 221         EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;
 222 #if 0
 223         EVP_PKEY *pkey;
 224         unsigned char *sigbuf;
 225 #endif
 226         unsigned int siglen;
 227 #else
 228         isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
 229 #endif
 230         unsigned char digest[ISC_SHA1_DIGESTLENGTH];
 231
 232
 233 #if USE_EVP
 234 #if 1
 235         /* Only use EVP for the digest */
 236         if (!EVP_DigestFinal_ex(evp_md_ctx, digest, &siglen)) {
 237                 return (ISC_R_FAILURE);
 238         }
 239 #endif
 240 #else
 241         isc_sha1_final(sha1ctx, digest);
 242 #endif
 243
 244         if (sig->length != 2 * ISC_SHA1_DIGESTLENGTH + 1) {
 245                 return (DST_R_VERIFYFAILURE);
 246         }
 247
 248         cp++;   /*%< Skip T */
 249         dsasig = DSA_SIG_new();
 250         if (dsasig == NULL)
 251                 return (ISC_R_NOMEMORY);
 252         dsasig->r = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
 253         cp += ISC_SHA1_DIGESTLENGTH;
 254         dsasig->s = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
 255
 256 #if 0
 257         pkey = EVP_PKEY_new();
 258         if (pkey == NULL)
 259                 return (ISC_R_NOMEMORY);
 260         if (!EVP_PKEY_set1_DSA(pkey, dsa)) {
 261                 EVP_PKEY_free(pkey);
 262                 return (ISC_R_FAILURE);
 263         }
 264         /* Convert to Dss-Sig-Value (RFC2459). */
 265         sigbuf = malloc(EVP_PKEY_size(pkey) + 50);
 266         if (sigbuf == NULL) {
 267                 EVP_PKEY_free(pkey);
 268                 return (ISC_R_NOMEMORY);
 269         }
 270         siglen = (unsigned) i2d_DSA_SIG(dsasig, &sigbuf);
 271         INSIST(EVP_PKEY_size(pkey) >= (int) siglen);
 272         status = EVP_VerifyFinal(evp_md_ctx, sigbuf, siglen, pkey);
 273         EVP_PKEY_free(pkey);
 274         free(sigbuf);
 275 #else
 276         status = DSA_do_verify(digest, ISC_SHA1_DIGESTLENGTH, dsasig, dsa);
 277 #endif
 278         DSA_SIG_free(dsasig);
 279         if (status != 1)
 280                 return (dst__openssl_toresult(DST_R_VERIFYFAILURE));
 281
 282         return (ISC_R_SUCCESS);
 283 }
 284
 285 static isc_boolean_t
 286 openssldsa_compare(const dst_key_t *key1, const dst_key_t *key2) {
 287         int status;
 288         DSA *dsa1, *dsa2;
 289
 290         dsa1 = key1->keydata.dsa;
 291         dsa2 = key2->keydata.dsa;
 292
 293         if (dsa1 == NULL && dsa2 == NULL)
 294                 return (ISC_TRUE);
 295         else if (dsa1 == NULL || dsa2 == NULL)
 296                 return (ISC_FALSE);
 297
 298         status = BN_cmp(dsa1->p, dsa2->p) ||
 299                  BN_cmp(dsa1->q, dsa2->q) ||
 300                  BN_cmp(dsa1->g, dsa2->g) ||
 301                  BN_cmp(dsa1->pub_key, dsa2->pub_key);
 302
 303         if (status != 0)
 304                 return (ISC_FALSE);
 305
 306         if (dsa1->priv_key != NULL || dsa2->priv_key != NULL) {
 307                 if (dsa1->priv_key == NULL || dsa2->priv_key == NULL)
 308                         return (ISC_FALSE);
 309                 if (BN_cmp(dsa1->priv_key, dsa2->priv_key))
 310                         return (ISC_FALSE);
 311         }
 312         return (ISC_TRUE);
 313 }
 314
 315 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 316 static int
 317 progress_cb(int p, int n, BN_GENCB *cb)
 318 {
 319         union {
 320                 void *dptr;
 321                 void (*fptr)(int);
 322         } u;
 323
 324         UNUSED(n);
 325
 326         u.dptr = cb->arg;
 327         if (u.fptr != NULL)
 328                 u.fptr(p);
 329         return (1);
 330 }
 331 #endif
 332
 333 static isc_result_t
 334 openssldsa_generate(dst_key_t *key, int unused, void (*callback)(int)) {
 335         DSA *dsa;
 336         unsigned char rand_array[ISC_SHA1_DIGESTLENGTH];
 337         isc_result_t result;
 338 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 339         BN_GENCB cb;
 340         union {
 341                 void *dptr;
 342                 void (*fptr)(int);
 343         } u;
 344
 345 #else
 346
 347         UNUSED(callback);
 348 #endif
 349         UNUSED(unused);
 350
 351         result = dst__entropy_getdata(rand_array, sizeof(rand_array),
 352                                       ISC_FALSE);
 353         if (result != ISC_R_SUCCESS)
 354                 return (result);
 355
 356 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 357         dsa = DSA_new();
 358         if (dsa == NULL)
 359                 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
 360
 361         if (callback == NULL) {
 362                 BN_GENCB_set_old(&cb, NULL, NULL);
 363         } else {
 364                 u.fptr = callback;
 365                 BN_GENCB_set(&cb, &progress_cb, u.dptr);
 366         }
 367
 368         if (!DSA_generate_parameters_ex(dsa, key->key_size, rand_array,
 369                                         ISC_SHA1_DIGESTLENGTH,  NULL, NULL,
 370                                         &cb))
 371         {
 372                 DSA_free(dsa);
 373                 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
 374         }
 375 #else
 376         dsa = DSA_generate_parameters(key->key_size, rand_array,
 377                                       ISC_SHA1_DIGESTLENGTH, NULL, NULL,
 378                                       NULL, NULL);
 379         if (dsa == NULL)
 380                 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
 381 #endif
 382
 383         if (DSA_generate_key(dsa) == 0) {
 384                 DSA_free(dsa);
 385                 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
 386         }
 387         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 388
 389         key->keydata.dsa = dsa;
 390
 391         return (ISC_R_SUCCESS);
 392 }
 393
 394 static isc_boolean_t
 395 openssldsa_isprivate(const dst_key_t *key) {
 396         DSA *dsa = key->keydata.dsa;
 397         return (ISC_TF(dsa != NULL && dsa->priv_key != NULL));
 398 }
 399
 400 static void
 401 openssldsa_destroy(dst_key_t *key) {
 402         DSA *dsa = key->keydata.dsa;
 403         DSA_free(dsa);
 404         key->keydata.dsa = NULL;
 405 }
 406
 407
 408 static isc_result_t
 409 openssldsa_todns(const dst_key_t *key, isc_buffer_t *data) {
 410         DSA *dsa;
 411         isc_region_t r;
 412         int dnslen;
 413         unsigned int t, p_bytes;
 414
 415         REQUIRE(key->keydata.dsa != NULL);
 416
 417         dsa = key->keydata.dsa;
 418
 419         isc_buffer_availableregion(data, &r);
 420
 421         t = (BN_num_bytes(dsa->p) - 64) / 8;
 422         if (t > 8)
 423                 return (DST_R_INVALIDPUBLICKEY);
 424         p_bytes = 64 + 8 * t;
 425
 426         dnslen = 1 + (key->key_size * 3)/8 + ISC_SHA1_DIGESTLENGTH;
 427         if (r.length < (unsigned int) dnslen)
 428                 return (ISC_R_NOSPACE);
 429
 430         *r.base++ = t;
 431         BN_bn2bin_fixed(dsa->q, r.base, ISC_SHA1_DIGESTLENGTH);
 432         r.base += ISC_SHA1_DIGESTLENGTH;
 433         BN_bn2bin_fixed(dsa->p, r.base, key->key_size/8);
 434         r.base += p_bytes;
 435         BN_bn2bin_fixed(dsa->g, r.base, key->key_size/8);
 436         r.base += p_bytes;
 437         BN_bn2bin_fixed(dsa->pub_key, r.base, key->key_size/8);
 438         r.base += p_bytes;
 439
 440         isc_buffer_add(data, dnslen);
 441
 442         return (ISC_R_SUCCESS);
 443 }
 444
 445 static isc_result_t
 446 openssldsa_fromdns(dst_key_t *key, isc_buffer_t *data) {
 447         DSA *dsa;
 448         isc_region_t r;
 449         unsigned int t, p_bytes;
 450         isc_mem_t *mctx = key->mctx;
 451
 452         UNUSED(mctx);
 453
 454         isc_buffer_remainingregion(data, &r);
 455         if (r.length == 0)
 456                 return (ISC_R_SUCCESS);
 457
 458         dsa = DSA_new();
 459         if (dsa == NULL)
 460                 return (ISC_R_NOMEMORY);
 461         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 462
 463         t = (unsigned int) *r.base++;
 464         if (t > 8) {
 465                 DSA_free(dsa);
 466                 return (DST_R_INVALIDPUBLICKEY);
 467         }
 468         p_bytes = 64 + 8 * t;
 469
 470         if (r.length < 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes) {
 471                 DSA_free(dsa);
 472                 return (DST_R_INVALIDPUBLICKEY);
 473         }
 474
 475         dsa->q = BN_bin2bn(r.base, ISC_SHA1_DIGESTLENGTH, NULL);
 476         r.base += ISC_SHA1_DIGESTLENGTH;
 477
 478         dsa->p = BN_bin2bn(r.base, p_bytes, NULL);
 479         r.base += p_bytes;
 480
 481         dsa->g = BN_bin2bn(r.base, p_bytes, NULL);
 482         r.base += p_bytes;
 483
 484         dsa->pub_key = BN_bin2bn(r.base, p_bytes, NULL);
 485         r.base += p_bytes;
 486
 487         key->key_size = p_bytes * 8;
 488
 489         isc_buffer_forward(data, 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes);
 490
 491         key->keydata.dsa = dsa;
 492
 493         return (ISC_R_SUCCESS);
 494 }
 495
 496
 497 static isc_result_t
 498 openssldsa_tofile(const dst_key_t *key, const char *directory) {
 499         int cnt = 0;
 500         DSA *dsa;
 501         dst_private_t priv;
 502         unsigned char bufs[5][128];
 503
 504         if (key->keydata.dsa == NULL)
 505                 return (DST_R_NULLKEY);
 506
 507         dsa = key->keydata.dsa;
 508
 509         priv.elements[cnt].tag = TAG_DSA_PRIME;
 510         priv.elements[cnt].length = BN_num_bytes(dsa->p);
 511         BN_bn2bin(dsa->p, bufs[cnt]);
 512         priv.elements[cnt].data = bufs[cnt];
 513         cnt++;
 514
 515         priv.elements[cnt].tag = TAG_DSA_SUBPRIME;
 516         priv.elements[cnt].length = BN_num_bytes(dsa->q);
 517         BN_bn2bin(dsa->q, bufs[cnt]);
 518         priv.elements[cnt].data = bufs[cnt];
 519         cnt++;
 520
 521         priv.elements[cnt].tag = TAG_DSA_BASE;
 522         priv.elements[cnt].length = BN_num_bytes(dsa->g);
 523         BN_bn2bin(dsa->g, bufs[cnt]);
 524         priv.elements[cnt].data = bufs[cnt];
 525         cnt++;
 526
 527         priv.elements[cnt].tag = TAG_DSA_PRIVATE;
 528         priv.elements[cnt].length = BN_num_bytes(dsa->priv_key);
 529         BN_bn2bin(dsa->priv_key, bufs[cnt]);
 530         priv.elements[cnt].data = bufs[cnt];
 531         cnt++;
 532
 533         priv.elements[cnt].tag = TAG_DSA_PUBLIC;
 534         priv.elements[cnt].length = BN_num_bytes(dsa->pub_key);
 535         BN_bn2bin(dsa->pub_key, bufs[cnt]);
 536         priv.elements[cnt].data = bufs[cnt];
 537         cnt++;
 538
 539         priv.nelements = cnt;
 540         return (dst__privstruct_writefile(key, &priv, directory));
 541 }
 542
 543 static isc_result_t
 544 openssldsa_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) {
 545         dst_private_t priv;
 546         isc_result_t ret;
 547         int i;
 548         DSA *dsa = NULL;
 549         isc_mem_t *mctx = key->mctx;
 550 #define DST_RET(a) {ret = a; goto err;}
 551
 552         UNUSED(pub);
 553         /* read private key file */
 554         ret = dst__privstruct_parse(key, DST_ALG_DSA, lexer, mctx, &priv);
 555         if (ret != ISC_R_SUCCESS)
 556                 return (ret);
 557
 558         dsa = DSA_new();
 559         if (dsa == NULL)
 560                 DST_RET(ISC_R_NOMEMORY);
 561         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 562         key->keydata.dsa = dsa;
 563
 564         for (i=0; i < priv.nelements; i++) {
 565                 BIGNUM *bn;
 566                 bn = BN_bin2bn(priv.elements[i].data,
 567                                priv.elements[i].length, NULL);
 568                 if (bn == NULL)
 569                         DST_RET(ISC_R_NOMEMORY);
 570
 571                 switch (priv.elements[i].tag) {
 572                         case TAG_DSA_PRIME:
 573                                 dsa->p = bn;
 574                                 break;
 575                         case TAG_DSA_SUBPRIME:
 576                                 dsa->q = bn;
 577                                 break;
 578                         case TAG_DSA_BASE:
 579                                 dsa->g = bn;
 580                                 break;
 581                         case TAG_DSA_PRIVATE:
 582                                 dsa->priv_key = bn;
 583                                 break;
 584                         case TAG_DSA_PUBLIC:
 585                                 dsa->pub_key = bn;
 586                                 break;
 587                 }
 588         }
 589         dst__privstruct_free(&priv, mctx);
 590
 591         key->key_size = BN_num_bits(dsa->p);
 592
 593         return (ISC_R_SUCCESS);
 594
 595  err:
 596         openssldsa_destroy(key);
 597         dst__privstruct_free(&priv, mctx);
 598         memset(&priv, 0, sizeof(priv));
 599         return (ret);
 600 }
 601
 602 static dst_func_t openssldsa_functions = {
 603         openssldsa_createctx,
 604         openssldsa_destroyctx,
 605         openssldsa_adddata,
 606         openssldsa_sign,
 607         openssldsa_verify,
 608         NULL, /*%< computesecret */
 609         openssldsa_compare,
 610         NULL, /*%< paramcompare */
 611         openssldsa_generate,
 612         openssldsa_isprivate,
 613         openssldsa_destroy,
 614         openssldsa_todns,
 615         openssldsa_fromdns,
 616         openssldsa_tofile,
 617         openssldsa_parse,
 618         NULL, /*%< cleanup */
 619         NULL, /*%< fromlabel */
 620         NULL, /*%< dump */
 621         NULL, /*%< restore */
 622 };
 623
 624 isc_result_t
 625 dst__openssldsa_init(dst_func_t **funcp) {
 626         REQUIRE(funcp != NULL);
 627         if (*funcp == NULL)
 628                 *funcp = &openssldsa_functions;
 629         return (ISC_R_SUCCESS);
 630 }
 631
 632 #else /* OPENSSL */
 633
 634 #include <isc/util.h>
 635
 636 EMPTY_TRANSLATION_UNIT
 637
 638 #endif /* OPENSSL */
 639 /*! \file */