external/bsd/bind/dist/lib/dns/openssldsa_link.c

   1 /*      $NetBSD: openssldsa_link.c,v 1.10 2015/09/03 07:33:34 christos Exp $    */
   2
   3 /*
   4  * Portions Copyright (C) 2004-2009, 2011-2014  Internet Systems Consortium, Inc. ("ISC")
   5  * Portions Copyright (C) 1999-2002  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS
  12  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
  13  * WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE
  14  * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
  17  * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  *
  19  * Portions Copyright (C) 1995-2000 by Network Associates, Inc.
  20  *
  21  * Permission to use, copy, modify, and/or distribute this software for any
  22  * purpose with or without fee is hereby granted, provided that the above
  23  * copyright notice and this permission notice appear in all copies.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS
  26  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
  27  * WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE
  28  * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  29  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  30  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
  31  * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  32  */
  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         unsigned int klen;
 141 #if USE_EVP
 142         EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;
 143         EVP_PKEY *pkey;
 144         unsigned char *sigbuf;
 145         const unsigned char *sb;
 146         unsigned int siglen;
 147 #else
 148         isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
 149         unsigned char digest[ISC_SHA1_DIGESTLENGTH];
 150 #endif
 151
 152         isc_buffer_availableregion(sig, &r);
 153         if (r.length < ISC_SHA1_DIGESTLENGTH * 2 + 1)
 154                 return (ISC_R_NOSPACE);
 155
 156 #if USE_EVP
 157         pkey = EVP_PKEY_new();
 158         if (pkey == NULL)
 159                 return (ISC_R_NOMEMORY);
 160         if (!EVP_PKEY_set1_DSA(pkey, dsa)) {
 161                 EVP_PKEY_free(pkey);
 162                 return (ISC_R_FAILURE);
 163         }
 164         sigbuf = malloc(EVP_PKEY_size(pkey));
 165         if (sigbuf == NULL) {
 166                 EVP_PKEY_free(pkey);
 167                 return (ISC_R_NOMEMORY);
 168         }
 169         if (!EVP_SignFinal(evp_md_ctx, sigbuf, &siglen, pkey)) {
 170                 EVP_PKEY_free(pkey);
 171                 free(sigbuf);
 172                 return (dst__openssl_toresult3(dctx->category,
 173                                                "EVP_SignFinal",
 174                                                ISC_R_FAILURE));
 175         }
 176         INSIST(EVP_PKEY_size(pkey) >= (int) siglen);
 177         EVP_PKEY_free(pkey);
 178         /* Convert from Dss-Sig-Value (RFC2459). */
 179         dsasig = DSA_SIG_new();
 180         if (dsasig == NULL) {
 181                 free(sigbuf);
 182                 return (ISC_R_NOMEMORY);
 183         }
 184         sb = sigbuf;
 185         if (d2i_DSA_SIG(&dsasig, &sb, (long) siglen) == NULL) {
 186                 free(sigbuf);
 187                 return (dst__openssl_toresult3(dctx->category,
 188                                                "d2i_DSA_SIG",
 189                                                ISC_R_FAILURE));
 190         }
 191         free(sigbuf);
 192
 193 #elif 0
 194         /* Only use EVP for the Digest */
 195         if (!EVP_DigestFinal_ex(evp_md_ctx, digest, &siglen)) {
 196                 return (dst__openssl_toresult3(dctx->category,
 197                                                "EVP_DigestFinal_ex",
 198                                                ISC_R_FAILURE));
 199         }
 200         dsasig = DSA_do_sign(digest, ISC_SHA1_DIGESTLENGTH, dsa);
 201         if (dsasig == NULL)
 202                 return (dst__openssl_toresult3(dctx->category,
 203                                                "DSA_do_sign",
 204                                                DST_R_SIGNFAILURE));
 205 #else
 206         isc_sha1_final(sha1ctx, digest);
 207
 208         dsasig = DSA_do_sign(digest, ISC_SHA1_DIGESTLENGTH, dsa);
 209         if (dsasig == NULL)
 210                 return (dst__openssl_toresult3(dctx->category,
 211                                                "DSA_do_sign",
 212                                                DST_R_SIGNFAILURE));
 213 #endif
 214
 215         klen = (key->key_size - 512)/64;
 216         if (klen > 255)
 217                 return (ISC_R_FAILURE);
 218         *r.base = klen;
 219         isc_region_consume(&r, 1);
 220
 221         BN_bn2bin_fixed(dsasig->r, r.base, ISC_SHA1_DIGESTLENGTH);
 222         isc_region_consume(&r, ISC_SHA1_DIGESTLENGTH);
 223         BN_bn2bin_fixed(dsasig->s, r.base, ISC_SHA1_DIGESTLENGTH);
 224         isc_region_consume(&r, ISC_SHA1_DIGESTLENGTH);
 225         DSA_SIG_free(dsasig);
 226         isc_buffer_add(sig, ISC_SHA1_DIGESTLENGTH * 2 + 1);
 227
 228         return (ISC_R_SUCCESS);
 229 }
 230
 231 static isc_result_t
 232 openssldsa_verify(dst_context_t *dctx, const isc_region_t *sig) {
 233         dst_key_t *key = dctx->key;
 234         DSA *dsa = key->keydata.dsa;
 235         int status = 0;
 236         unsigned char *cp = sig->base;
 237         DSA_SIG *dsasig;
 238 #if USE_EVP
 239         EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;
 240 #if 0
 241         EVP_PKEY *pkey;
 242         unsigned char *sigbuf;
 243 #endif
 244         unsigned int siglen;
 245 #else
 246         isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
 247 #endif
 248         unsigned char digest[ISC_SHA1_DIGESTLENGTH];
 249
 250
 251 #if USE_EVP
 252 #if 1
 253         /* Only use EVP for the digest */
 254         if (!EVP_DigestFinal_ex(evp_md_ctx, digest, &siglen)) {
 255                 return (ISC_R_FAILURE);
 256         }
 257 #endif
 258 #else
 259         isc_sha1_final(sha1ctx, digest);
 260 #endif
 261
 262         if (sig->length != 2 * ISC_SHA1_DIGESTLENGTH + 1) {
 263                 return (DST_R_VERIFYFAILURE);
 264         }
 265
 266         cp++;   /*%< Skip T */
 267         dsasig = DSA_SIG_new();
 268         if (dsasig == NULL)
 269                 return (ISC_R_NOMEMORY);
 270         dsasig->r = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
 271         cp += ISC_SHA1_DIGESTLENGTH;
 272         dsasig->s = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
 273
 274 #if 0
 275         pkey = EVP_PKEY_new();
 276         if (pkey == NULL)
 277                 return (ISC_R_NOMEMORY);
 278         if (!EVP_PKEY_set1_DSA(pkey, dsa)) {
 279                 EVP_PKEY_free(pkey);
 280                 return (ISC_R_FAILURE);
 281         }
 282         /* Convert to Dss-Sig-Value (RFC2459). */
 283         sigbuf = malloc(EVP_PKEY_size(pkey) + 50);
 284         if (sigbuf == NULL) {
 285                 EVP_PKEY_free(pkey);
 286                 return (ISC_R_NOMEMORY);
 287         }
 288         siglen = (unsigned) i2d_DSA_SIG(dsasig, &sigbuf);
 289         INSIST(EVP_PKEY_size(pkey) >= (int) siglen);
 290         status = EVP_VerifyFinal(evp_md_ctx, sigbuf, siglen, pkey);
 291         EVP_PKEY_free(pkey);
 292         free(sigbuf);
 293 #else
 294         status = DSA_do_verify(digest, ISC_SHA1_DIGESTLENGTH, dsasig, dsa);
 295 #endif
 296         DSA_SIG_free(dsasig);
 297         switch (status) {
 298         case 1:
 299         return (ISC_R_SUCCESS);
 300         case 0:
 301                 return (dst__openssl_toresult(DST_R_VERIFYFAILURE));
 302         default:
 303                 return (dst__openssl_toresult3(dctx->category,
 304                                                "DSA_do_verify",
 305                                                DST_R_VERIFYFAILURE));
 306         }
 307 }
 308
 309 static isc_boolean_t
 310 openssldsa_compare(const dst_key_t *key1, const dst_key_t *key2) {
 311         int status;
 312         DSA *dsa1, *dsa2;
 313
 314         dsa1 = key1->keydata.dsa;
 315         dsa2 = key2->keydata.dsa;
 316
 317         if (dsa1 == NULL && dsa2 == NULL)
 318                 return (ISC_TRUE);
 319         else if (dsa1 == NULL || dsa2 == NULL)
 320                 return (ISC_FALSE);
 321
 322         status = BN_cmp(dsa1->p, dsa2->p) ||
 323                  BN_cmp(dsa1->q, dsa2->q) ||
 324                  BN_cmp(dsa1->g, dsa2->g) ||
 325                  BN_cmp(dsa1->pub_key, dsa2->pub_key);
 326
 327         if (status != 0)
 328                 return (ISC_FALSE);
 329
 330         if (dsa1->priv_key != NULL || dsa2->priv_key != NULL) {
 331                 if (dsa1->priv_key == NULL || dsa2->priv_key == NULL)
 332                         return (ISC_FALSE);
 333                 if (BN_cmp(dsa1->priv_key, dsa2->priv_key))
 334                         return (ISC_FALSE);
 335         }
 336         return (ISC_TRUE);
 337 }
 338
 339 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 340 static int
 341 progress_cb(int p, int n, BN_GENCB *cb)
 342 {
 343         union {
 344                 void *dptr;
 345                 void (*fptr)(int);
 346         } u;
 347
 348         UNUSED(n);
 349
 350         u.dptr = cb->arg;
 351         if (u.fptr != NULL)
 352                 u.fptr(p);
 353         return (1);
 354 }
 355 #endif
 356
 357 static isc_result_t
 358 openssldsa_generate(dst_key_t *key, int unused, void (*callback)(int)) {
 359         DSA *dsa;
 360         unsigned char rand_array[ISC_SHA1_DIGESTLENGTH];
 361         isc_result_t result;
 362 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 363         BN_GENCB cb;
 364         union {
 365                 void *dptr;
 366                 void (*fptr)(int);
 367         } u;
 368
 369 #else
 370
 371         UNUSED(callback);
 372 #endif
 373         UNUSED(unused);
 374
 375         result = dst__entropy_getdata(rand_array, sizeof(rand_array),
 376                                       ISC_FALSE);
 377         if (result != ISC_R_SUCCESS)
 378                 return (result);
 379
 380 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 381         dsa = DSA_new();
 382         if (dsa == NULL)
 383                 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
 384
 385         if (callback == NULL) {
 386                 BN_GENCB_set_old(&cb, NULL, NULL);
 387         } else {
 388                 u.fptr = callback;
 389                 BN_GENCB_set(&cb, &progress_cb, u.dptr);
 390         }
 391
 392         if (!DSA_generate_parameters_ex(dsa, key->key_size, rand_array,
 393                                         ISC_SHA1_DIGESTLENGTH,  NULL, NULL,
 394                                         &cb))
 395         {
 396                 DSA_free(dsa);
 397                 return (dst__openssl_toresult2("DSA_generate_parameters_ex",
 398                                                DST_R_OPENSSLFAILURE));
 399         }
 400 #else
 401         dsa = DSA_generate_parameters(key->key_size, rand_array,
 402                                       ISC_SHA1_DIGESTLENGTH, NULL, NULL,
 403                                       NULL, NULL);
 404         if (dsa == NULL)
 405                 return (dst__openssl_toresult2("DSA_generate_parameters",
 406                                                DST_R_OPENSSLFAILURE));
 407 #endif
 408
 409         if (DSA_generate_key(dsa) == 0) {
 410                 DSA_free(dsa);
 411                 return (dst__openssl_toresult2("DSA_generate_key",
 412                                                DST_R_OPENSSLFAILURE));
 413         }
 414         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 415
 416         key->keydata.dsa = dsa;
 417
 418         return (ISC_R_SUCCESS);
 419 }
 420
 421 static isc_boolean_t
 422 openssldsa_isprivate(const dst_key_t *key) {
 423         DSA *dsa = key->keydata.dsa;
 424         return (ISC_TF(dsa != NULL && dsa->priv_key != NULL));
 425 }
 426
 427 static void
 428 openssldsa_destroy(dst_key_t *key) {
 429         DSA *dsa = key->keydata.dsa;
 430         DSA_free(dsa);
 431         key->keydata.dsa = NULL;
 432 }
 433
 434
 435 static isc_result_t
 436 openssldsa_todns(const dst_key_t *key, isc_buffer_t *data) {
 437         DSA *dsa;
 438         isc_region_t r;
 439         int dnslen;
 440         unsigned int t, p_bytes;
 441
 442         REQUIRE(key->keydata.dsa != NULL);
 443
 444         dsa = key->keydata.dsa;
 445
 446         isc_buffer_availableregion(data, &r);
 447
 448         t = (BN_num_bytes(dsa->p) - 64) / 8;
 449         if (t > 8)
 450                 return (DST_R_INVALIDPUBLICKEY);
 451         p_bytes = 64 + 8 * t;
 452
 453         dnslen = 1 + (key->key_size * 3)/8 + ISC_SHA1_DIGESTLENGTH;
 454         if (r.length < (unsigned int) dnslen)
 455                 return (ISC_R_NOSPACE);
 456
 457         *r.base = t;
 458         isc_region_consume(&r, 1);
 459         BN_bn2bin_fixed(dsa->q, r.base, ISC_SHA1_DIGESTLENGTH);
 460         isc_region_consume(&r, ISC_SHA1_DIGESTLENGTH);
 461         BN_bn2bin_fixed(dsa->p, r.base, key->key_size/8);
 462         isc_region_consume(&r, p_bytes);
 463         BN_bn2bin_fixed(dsa->g, r.base, key->key_size/8);
 464         isc_region_consume(&r, p_bytes);
 465         BN_bn2bin_fixed(dsa->pub_key, r.base, key->key_size/8);
 466         isc_region_consume(&r, p_bytes);
 467
 468         isc_buffer_add(data, dnslen);
 469
 470         return (ISC_R_SUCCESS);
 471 }
 472
 473 static isc_result_t
 474 openssldsa_fromdns(dst_key_t *key, isc_buffer_t *data) {
 475         DSA *dsa;
 476         isc_region_t r;
 477         unsigned int t, p_bytes;
 478         isc_mem_t *mctx = key->mctx;
 479
 480         UNUSED(mctx);
 481
 482         isc_buffer_remainingregion(data, &r);
 483         if (r.length == 0)
 484                 return (ISC_R_SUCCESS);
 485
 486         dsa = DSA_new();
 487         if (dsa == NULL)
 488                 return (ISC_R_NOMEMORY);
 489         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 490
 491         t = (unsigned int) *r.base;
 492         isc_region_consume(&r, 1);
 493         if (t > 8) {
 494                 DSA_free(dsa);
 495                 return (DST_R_INVALIDPUBLICKEY);
 496         }
 497         p_bytes = 64 + 8 * t;
 498
 499         if (r.length < ISC_SHA1_DIGESTLENGTH + 3 * p_bytes) {
 500                 DSA_free(dsa);
 501                 return (DST_R_INVALIDPUBLICKEY);
 502         }
 503
 504         dsa->q = BN_bin2bn(r.base, ISC_SHA1_DIGESTLENGTH, NULL);
 505         isc_region_consume(&r, ISC_SHA1_DIGESTLENGTH);
 506
 507         dsa->p = BN_bin2bn(r.base, p_bytes, NULL);
 508         isc_region_consume(&r, p_bytes);
 509
 510         dsa->g = BN_bin2bn(r.base, p_bytes, NULL);
 511         isc_region_consume(&r, p_bytes);
 512
 513         dsa->pub_key = BN_bin2bn(r.base, p_bytes, NULL);
 514         isc_region_consume(&r, p_bytes);
 515
 516         key->key_size = p_bytes * 8;
 517
 518         isc_buffer_forward(data, 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes);
 519
 520         key->keydata.dsa = dsa;
 521
 522         return (ISC_R_SUCCESS);
 523 }
 524
 525
 526 static isc_result_t
 527 openssldsa_tofile(const dst_key_t *key, const char *directory) {
 528         int cnt = 0;
 529         DSA *dsa;
 530         dst_private_t priv;
 531         unsigned char bufs[5][128];
 532
 533         if (key->keydata.dsa == NULL)
 534                 return (DST_R_NULLKEY);
 535
 536         if (key->external) {
 537                 priv.nelements = 0;
 538                 return (dst__privstruct_writefile(key, &priv, directory));
 539         }
 540
 541         dsa = key->keydata.dsa;
 542
 543         priv.elements[cnt].tag = TAG_DSA_PRIME;
 544         priv.elements[cnt].length = BN_num_bytes(dsa->p);
 545         BN_bn2bin(dsa->p, bufs[cnt]);
 546         priv.elements[cnt].data = bufs[cnt];
 547         cnt++;
 548
 549         priv.elements[cnt].tag = TAG_DSA_SUBPRIME;
 550         priv.elements[cnt].length = BN_num_bytes(dsa->q);
 551         BN_bn2bin(dsa->q, bufs[cnt]);
 552         priv.elements[cnt].data = bufs[cnt];
 553         cnt++;
 554
 555         priv.elements[cnt].tag = TAG_DSA_BASE;
 556         priv.elements[cnt].length = BN_num_bytes(dsa->g);
 557         BN_bn2bin(dsa->g, bufs[cnt]);
 558         priv.elements[cnt].data = bufs[cnt];
 559         cnt++;
 560
 561         priv.elements[cnt].tag = TAG_DSA_PRIVATE;
 562         priv.elements[cnt].length = BN_num_bytes(dsa->priv_key);
 563         BN_bn2bin(dsa->priv_key, bufs[cnt]);
 564         priv.elements[cnt].data = bufs[cnt];
 565         cnt++;
 566
 567         priv.elements[cnt].tag = TAG_DSA_PUBLIC;
 568         priv.elements[cnt].length = BN_num_bytes(dsa->pub_key);
 569         BN_bn2bin(dsa->pub_key, bufs[cnt]);
 570         priv.elements[cnt].data = bufs[cnt];
 571         cnt++;
 572
 573         priv.nelements = cnt;
 574         return (dst__privstruct_writefile(key, &priv, directory));
 575 }
 576
 577 static isc_result_t
 578 openssldsa_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) {
 579         dst_private_t priv;
 580         isc_result_t ret;
 581         int i;
 582         DSA *dsa = NULL;
 583         isc_mem_t *mctx = key->mctx;
 584 #define DST_RET(a) {ret = a; goto err;}
 585
 586         /* read private key file */
 587         ret = dst__privstruct_parse(key, DST_ALG_DSA, lexer, mctx, &priv);
 588         if (ret != ISC_R_SUCCESS)
 589                 return (ret);
 590
 591         if (key->external) {
 592                 if (priv.nelements != 0)
 593                         DST_RET(DST_R_INVALIDPRIVATEKEY);
 594                 if (pub == NULL)
 595                         DST_RET(DST_R_INVALIDPRIVATEKEY);
 596                 key->keydata.pkey = pub->keydata.pkey;
 597                 pub->keydata.pkey = NULL;
 598                 key->key_size = pub->key_size;
 599                 dst__privstruct_free(&priv, mctx);
 600                 memset(&priv, 0, sizeof(priv));
 601                 return (ISC_R_SUCCESS);
 602         }
 603
 604         dsa = DSA_new();
 605         if (dsa == NULL)
 606                 DST_RET(ISC_R_NOMEMORY);
 607         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 608         key->keydata.dsa = dsa;
 609
 610         for (i = 0; i < priv.nelements; i++) {
 611                 BIGNUM *bn;
 612                 bn = BN_bin2bn(priv.elements[i].data,
 613                                priv.elements[i].length, NULL);
 614                 if (bn == NULL)
 615                         DST_RET(ISC_R_NOMEMORY);
 616
 617                 switch (priv.elements[i].tag) {
 618                         case TAG_DSA_PRIME:
 619                                 dsa->p = bn;
 620                                 break;
 621                         case TAG_DSA_SUBPRIME:
 622                                 dsa->q = bn;
 623                                 break;
 624                         case TAG_DSA_BASE:
 625                                 dsa->g = bn;
 626                                 break;
 627                         case TAG_DSA_PRIVATE:
 628                                 dsa->priv_key = bn;
 629                                 break;
 630                         case TAG_DSA_PUBLIC:
 631                                 dsa->pub_key = bn;
 632                                 break;
 633                 }
 634         }
 635         dst__privstruct_free(&priv, mctx);
 636         memset(&priv, 0, sizeof(priv));
 637         key->key_size = BN_num_bits(dsa->p);
 638         return (ISC_R_SUCCESS);
 639
 640  err:
 641         openssldsa_destroy(key);
 642         dst__privstruct_free(&priv, mctx);
 643         memset(&priv, 0, sizeof(priv));
 644         return (ret);
 645 }
 646
 647 static dst_func_t openssldsa_functions = {
 648         openssldsa_createctx,
 649         NULL, /*%< createctx2 */
 650         openssldsa_destroyctx,
 651         openssldsa_adddata,
 652         openssldsa_sign,
 653         openssldsa_verify,
 654         NULL, /*%< verify2 */
 655         NULL, /*%< computesecret */
 656         openssldsa_compare,
 657         NULL, /*%< paramcompare */
 658         openssldsa_generate,
 659         openssldsa_isprivate,
 660         openssldsa_destroy,
 661         openssldsa_todns,
 662         openssldsa_fromdns,
 663         openssldsa_tofile,
 664         openssldsa_parse,
 665         NULL, /*%< cleanup */
 666         NULL, /*%< fromlabel */
 667         NULL, /*%< dump */
 668         NULL, /*%< restore */
 669 };
 670
 671 isc_result_t
 672 dst__openssldsa_init(dst_func_t **funcp) {
 673         REQUIRE(funcp != NULL);
 674         if (*funcp == NULL)
 675                 *funcp = &openssldsa_functions;
 676         return (ISC_R_SUCCESS);
 677 }
 678
 679 #else /* OPENSSL */
 680
 681 #include <isc/util.h>
 682
 683 EMPTY_TRANSLATION_UNIT
 684
 685 #endif /* OPENSSL */
 686 /*! \file */