contrib/bind9/lib/dns/openssldsa_link.c

   1 /*
   2  * Portions Copyright (C) 2004-2009  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 1.13.120.2 2009/01/14 23:47:26 tbox 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         cp += ISC_SHA1_DIGESTLENGTH;
 256
 257 #if 0
 258         pkey = EVP_PKEY_new();
 259         if (pkey == NULL)
 260                 return (ISC_R_NOMEMORY);
 261         if (!EVP_PKEY_set1_DSA(pkey, dsa)) {
 262                 EVP_PKEY_free(pkey);
 263                 return (ISC_R_FAILURE);
 264         }
 265         /* Convert to Dss-Sig-Value (RFC2459). */
 266         sigbuf = malloc(EVP_PKEY_size(pkey) + 50);
 267         if (sigbuf == NULL) {
 268                 EVP_PKEY_free(pkey);
 269                 return (ISC_R_NOMEMORY);
 270         }
 271         siglen = (unsigned) i2d_DSA_SIG(dsasig, &sigbuf);
 272         INSIST(EVP_PKEY_size(pkey) >= (int) siglen);
 273         status = EVP_VerifyFinal(evp_md_ctx, sigbuf, siglen, pkey);
 274         EVP_PKEY_free(pkey);
 275         free(sigbuf);
 276 #else
 277         status = DSA_do_verify(digest, ISC_SHA1_DIGESTLENGTH, dsasig, dsa);
 278 #endif
 279         DSA_SIG_free(dsasig);
 280         if (status != 1)
 281                 return (dst__openssl_toresult(DST_R_VERIFYFAILURE));
 282
 283         return (ISC_R_SUCCESS);
 284 }
 285
 286 static isc_boolean_t
 287 openssldsa_compare(const dst_key_t *key1, const dst_key_t *key2) {
 288         int status;
 289         DSA *dsa1, *dsa2;
 290
 291         dsa1 = key1->keydata.dsa;
 292         dsa2 = key2->keydata.dsa;
 293
 294         if (dsa1 == NULL && dsa2 == NULL)
 295                 return (ISC_TRUE);
 296         else if (dsa1 == NULL || dsa2 == NULL)
 297                 return (ISC_FALSE);
 298
 299         status = BN_cmp(dsa1->p, dsa2->p) ||
 300                  BN_cmp(dsa1->q, dsa2->q) ||
 301                  BN_cmp(dsa1->g, dsa2->g) ||
 302                  BN_cmp(dsa1->pub_key, dsa2->pub_key);
 303
 304         if (status != 0)
 305                 return (ISC_FALSE);
 306
 307         if (dsa1->priv_key != NULL || dsa2->priv_key != NULL) {
 308                 if (dsa1->priv_key == NULL || dsa2->priv_key == NULL)
 309                         return (ISC_FALSE);
 310                 if (BN_cmp(dsa1->priv_key, dsa2->priv_key))
 311                         return (ISC_FALSE);
 312         }
 313         return (ISC_TRUE);
 314 }
 315
 316 static isc_result_t
 317 openssldsa_generate(dst_key_t *key, int unused) {
 318 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 319         BN_GENCB cb;
 320 #endif
 321         DSA *dsa;
 322         unsigned char rand_array[ISC_SHA1_DIGESTLENGTH];
 323         isc_result_t result;
 324
 325         UNUSED(unused);
 326
 327         result = dst__entropy_getdata(rand_array, sizeof(rand_array),
 328                                       ISC_FALSE);
 329         if (result != ISC_R_SUCCESS)
 330                 return (result);
 331
 332 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 333         dsa = DSA_new();
 334         if (dsa == NULL)
 335                 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
 336
 337         BN_GENCB_set_old(&cb, NULL, NULL);
 338
 339         if (!DSA_generate_parameters_ex(dsa, key->key_size, rand_array,
 340                                         ISC_SHA1_DIGESTLENGTH,  NULL, NULL,
 341                                         &cb))
 342         {
 343                 DSA_free(dsa);
 344                 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
 345         }
 346 #else
 347         dsa = DSA_generate_parameters(key->key_size, rand_array,
 348                                       ISC_SHA1_DIGESTLENGTH, NULL, NULL,
 349                                       NULL, NULL);
 350         if (dsa == NULL)
 351                 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
 352 #endif
 353
 354         if (DSA_generate_key(dsa) == 0) {
 355                 DSA_free(dsa);
 356                 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
 357         }
 358         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 359
 360         key->keydata.dsa = dsa;
 361
 362         return (ISC_R_SUCCESS);
 363 }
 364
 365 static isc_boolean_t
 366 openssldsa_isprivate(const dst_key_t *key) {
 367         DSA *dsa = key->keydata.dsa;
 368         return (ISC_TF(dsa != NULL && dsa->priv_key != NULL));
 369 }
 370
 371 static void
 372 openssldsa_destroy(dst_key_t *key) {
 373         DSA *dsa = key->keydata.dsa;
 374         DSA_free(dsa);
 375         key->keydata.dsa = NULL;
 376 }
 377
 378
 379 static isc_result_t
 380 openssldsa_todns(const dst_key_t *key, isc_buffer_t *data) {
 381         DSA *dsa;
 382         isc_region_t r;
 383         int dnslen;
 384         unsigned int t, p_bytes;
 385
 386         REQUIRE(key->keydata.dsa != NULL);
 387
 388         dsa = key->keydata.dsa;
 389
 390         isc_buffer_availableregion(data, &r);
 391
 392         t = (BN_num_bytes(dsa->p) - 64) / 8;
 393         if (t > 8)
 394                 return (DST_R_INVALIDPUBLICKEY);
 395         p_bytes = 64 + 8 * t;
 396
 397         dnslen = 1 + (key->key_size * 3)/8 + ISC_SHA1_DIGESTLENGTH;
 398         if (r.length < (unsigned int) dnslen)
 399                 return (ISC_R_NOSPACE);
 400
 401         *r.base++ = t;
 402         BN_bn2bin_fixed(dsa->q, r.base, ISC_SHA1_DIGESTLENGTH);
 403         r.base += ISC_SHA1_DIGESTLENGTH;
 404         BN_bn2bin_fixed(dsa->p, r.base, key->key_size/8);
 405         r.base += p_bytes;
 406         BN_bn2bin_fixed(dsa->g, r.base, key->key_size/8);
 407         r.base += p_bytes;
 408         BN_bn2bin_fixed(dsa->pub_key, r.base, key->key_size/8);
 409         r.base += p_bytes;
 410
 411         isc_buffer_add(data, dnslen);
 412
 413         return (ISC_R_SUCCESS);
 414 }
 415
 416 static isc_result_t
 417 openssldsa_fromdns(dst_key_t *key, isc_buffer_t *data) {
 418         DSA *dsa;
 419         isc_region_t r;
 420         unsigned int t, p_bytes;
 421         isc_mem_t *mctx = key->mctx;
 422
 423         UNUSED(mctx);
 424
 425         isc_buffer_remainingregion(data, &r);
 426         if (r.length == 0)
 427                 return (ISC_R_SUCCESS);
 428
 429         dsa = DSA_new();
 430         if (dsa == NULL)
 431                 return (ISC_R_NOMEMORY);
 432         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 433
 434         t = (unsigned int) *r.base++;
 435         if (t > 8) {
 436                 DSA_free(dsa);
 437                 return (DST_R_INVALIDPUBLICKEY);
 438         }
 439         p_bytes = 64 + 8 * t;
 440
 441         if (r.length < 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes) {
 442                 DSA_free(dsa);
 443                 return (DST_R_INVALIDPUBLICKEY);
 444         }
 445
 446         dsa->q = BN_bin2bn(r.base, ISC_SHA1_DIGESTLENGTH, NULL);
 447         r.base += ISC_SHA1_DIGESTLENGTH;
 448
 449         dsa->p = BN_bin2bn(r.base, p_bytes, NULL);
 450         r.base += p_bytes;
 451
 452         dsa->g = BN_bin2bn(r.base, p_bytes, NULL);
 453         r.base += p_bytes;
 454
 455         dsa->pub_key = BN_bin2bn(r.base, p_bytes, NULL);
 456         r.base += p_bytes;
 457
 458         key->key_size = p_bytes * 8;
 459
 460         isc_buffer_forward(data, 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes);
 461
 462         key->keydata.dsa = dsa;
 463
 464         return (ISC_R_SUCCESS);
 465 }
 466
 467
 468 static isc_result_t
 469 openssldsa_tofile(const dst_key_t *key, const char *directory) {
 470         int cnt = 0;
 471         DSA *dsa;
 472         dst_private_t priv;
 473         unsigned char bufs[5][128];
 474
 475         if (key->keydata.dsa == NULL)
 476                 return (DST_R_NULLKEY);
 477
 478         dsa = key->keydata.dsa;
 479
 480         priv.elements[cnt].tag = TAG_DSA_PRIME;
 481         priv.elements[cnt].length = BN_num_bytes(dsa->p);
 482         BN_bn2bin(dsa->p, bufs[cnt]);
 483         priv.elements[cnt].data = bufs[cnt];
 484         cnt++;
 485
 486         priv.elements[cnt].tag = TAG_DSA_SUBPRIME;
 487         priv.elements[cnt].length = BN_num_bytes(dsa->q);
 488         BN_bn2bin(dsa->q, bufs[cnt]);
 489         priv.elements[cnt].data = bufs[cnt];
 490         cnt++;
 491
 492         priv.elements[cnt].tag = TAG_DSA_BASE;
 493         priv.elements[cnt].length = BN_num_bytes(dsa->g);
 494         BN_bn2bin(dsa->g, bufs[cnt]);
 495         priv.elements[cnt].data = bufs[cnt];
 496         cnt++;
 497
 498         priv.elements[cnt].tag = TAG_DSA_PRIVATE;
 499         priv.elements[cnt].length = BN_num_bytes(dsa->priv_key);
 500         BN_bn2bin(dsa->priv_key, bufs[cnt]);
 501         priv.elements[cnt].data = bufs[cnt];
 502         cnt++;
 503
 504         priv.elements[cnt].tag = TAG_DSA_PUBLIC;
 505         priv.elements[cnt].length = BN_num_bytes(dsa->pub_key);
 506         BN_bn2bin(dsa->pub_key, bufs[cnt]);
 507         priv.elements[cnt].data = bufs[cnt];
 508         cnt++;
 509
 510         priv.nelements = cnt;
 511         return (dst__privstruct_writefile(key, &priv, directory));
 512 }
 513
 514 static isc_result_t
 515 openssldsa_parse(dst_key_t *key, isc_lex_t *lexer) {
 516         dst_private_t priv;
 517         isc_result_t ret;
 518         int i;
 519         DSA *dsa = NULL;
 520         isc_mem_t *mctx = key->mctx;
 521 #define DST_RET(a) {ret = a; goto err;}
 522
 523         /* read private key file */
 524         ret = dst__privstruct_parse(key, DST_ALG_DSA, lexer, mctx, &priv);
 525         if (ret != ISC_R_SUCCESS)
 526                 return (ret);
 527
 528         dsa = DSA_new();
 529         if (dsa == NULL)
 530                 DST_RET(ISC_R_NOMEMORY);
 531         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 532         key->keydata.dsa = dsa;
 533
 534         for (i=0; i < priv.nelements; i++) {
 535                 BIGNUM *bn;
 536                 bn = BN_bin2bn(priv.elements[i].data,
 537                                priv.elements[i].length, NULL);
 538                 if (bn == NULL)
 539                         DST_RET(ISC_R_NOMEMORY);
 540
 541                 switch (priv.elements[i].tag) {
 542                         case TAG_DSA_PRIME:
 543                                 dsa->p = bn;
 544                                 break;
 545                         case TAG_DSA_SUBPRIME:
 546                                 dsa->q = bn;
 547                                 break;
 548                         case TAG_DSA_BASE:
 549                                 dsa->g = bn;
 550                                 break;
 551                         case TAG_DSA_PRIVATE:
 552                                 dsa->priv_key = bn;
 553                                 break;
 554                         case TAG_DSA_PUBLIC:
 555                                 dsa->pub_key = bn;
 556                                 break;
 557                 }
 558         }
 559         dst__privstruct_free(&priv, mctx);
 560
 561         key->key_size = BN_num_bits(dsa->p);
 562
 563         return (ISC_R_SUCCESS);
 564
 565  err:
 566         openssldsa_destroy(key);
 567         dst__privstruct_free(&priv, mctx);
 568         memset(&priv, 0, sizeof(priv));
 569         return (ret);
 570 }
 571
 572 static dst_func_t openssldsa_functions = {
 573         openssldsa_createctx,
 574         openssldsa_destroyctx,
 575         openssldsa_adddata,
 576         openssldsa_sign,
 577         openssldsa_verify,
 578         NULL, /*%< computesecret */
 579         openssldsa_compare,
 580         NULL, /*%< paramcompare */
 581         openssldsa_generate,
 582         openssldsa_isprivate,
 583         openssldsa_destroy,
 584         openssldsa_todns,
 585         openssldsa_fromdns,
 586         openssldsa_tofile,
 587         openssldsa_parse,
 588         NULL, /*%< cleanup */
 589         NULL, /*%< fromlabel */
 590 };
 591
 592 isc_result_t
 593 dst__openssldsa_init(dst_func_t **funcp) {
 594         REQUIRE(funcp != NULL);
 595         if (*funcp == NULL)
 596                 *funcp = &openssldsa_functions;
 597         return (ISC_R_SUCCESS);
 598 }
 599
 600 #else /* OPENSSL */
 601
 602 #include <isc/util.h>
 603
 604 EMPTY_TRANSLATION_UNIT
 605
 606 #endif /* OPENSSL */
 607 /*! \file */