contrib/bind9/lib/dns/openssldsa_link.c

   1 /*
   2  * Portions Copyright (C) 2004-2009, 2011-2013  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 #ifdef OPENSSL
  33 #ifndef USE_EVP
  34 #define USE_EVP 1
  35 #endif
  36
  37 #include <config.h>
  38
  39 #include <string.h>
  40
  41 #include <isc/entropy.h>
  42 #include <isc/mem.h>
  43 #include <isc/sha1.h>
  44 #include <isc/util.h>
  45
  46 #include <dst/result.h>
  47
  48 #include "dst_internal.h"
  49 #include "dst_openssl.h"
  50 #include "dst_parse.h"
  51
  52 #include <openssl/dsa.h>
  53
  54 static isc_result_t openssldsa_todns(const dst_key_t *key, isc_buffer_t *data);
  55
  56 static isc_result_t
  57 openssldsa_createctx(dst_key_t *key, dst_context_t *dctx) {
  58 #if USE_EVP
  59         EVP_MD_CTX *evp_md_ctx;
  60
  61         UNUSED(key);
  62
  63         evp_md_ctx = EVP_MD_CTX_create();
  64         if (evp_md_ctx == NULL)
  65                 return (ISC_R_NOMEMORY);
  66
  67         if (!EVP_DigestInit_ex(evp_md_ctx, EVP_dss1(), NULL)) {
  68                 EVP_MD_CTX_destroy(evp_md_ctx);
  69                         return (ISC_R_FAILURE);
  70         }
  71
  72         dctx->ctxdata.evp_md_ctx = evp_md_ctx;
  73
  74         return (ISC_R_SUCCESS);
  75 #else
  76         isc_sha1_t *sha1ctx;
  77
  78         UNUSED(key);
  79
  80         sha1ctx = isc_mem_get(dctx->mctx, sizeof(isc_sha1_t));
  81         isc_sha1_init(sha1ctx);
  82         dctx->ctxdata.sha1ctx = sha1ctx;
  83         return (ISC_R_SUCCESS);
  84 #endif
  85 }
  86
  87 static void
  88 openssldsa_destroyctx(dst_context_t *dctx) {
  89 #if USE_EVP
  90         EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;
  91
  92         if (evp_md_ctx != NULL) {
  93                 EVP_MD_CTX_destroy(evp_md_ctx);
  94                 dctx->ctxdata.evp_md_ctx = NULL;
  95         }
  96 #else
  97         isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
  98
  99         if (sha1ctx != NULL) {
 100                 isc_sha1_invalidate(sha1ctx);
 101                 isc_mem_put(dctx->mctx, sha1ctx, sizeof(isc_sha1_t));
 102                 dctx->ctxdata.sha1ctx = NULL;
 103         }
 104 #endif
 105 }
 106
 107 static isc_result_t
 108 openssldsa_adddata(dst_context_t *dctx, const isc_region_t *data) {
 109 #if USE_EVP
 110         EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;
 111
 112         if (!EVP_DigestUpdate(evp_md_ctx, data->base, data->length)) {
 113                 return (ISC_R_FAILURE);
 114         }
 115 #else
 116         isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
 117
 118         isc_sha1_update(sha1ctx, data->base, data->length);
 119 #endif
 120         return (ISC_R_SUCCESS);
 121 }
 122
 123 static int
 124 BN_bn2bin_fixed(BIGNUM *bn, unsigned char *buf, int size) {
 125         int bytes = size - BN_num_bytes(bn);
 126         while (bytes-- > 0)
 127                 *buf++ = 0;
 128         BN_bn2bin(bn, buf);
 129         return (size);
 130 }
 131
 132 static isc_result_t
 133 openssldsa_sign(dst_context_t *dctx, isc_buffer_t *sig) {
 134         dst_key_t *key = dctx->key;
 135         DSA *dsa = key->keydata.dsa;
 136         isc_region_t r;
 137         DSA_SIG *dsasig;
 138         unsigned int klen;
 139 #if USE_EVP
 140         EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;
 141         EVP_PKEY *pkey;
 142         unsigned char *sigbuf;
 143         const unsigned char *sb;
 144         unsigned int siglen;
 145 #else
 146         isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
 147         unsigned char digest[ISC_SHA1_DIGESTLENGTH];
 148 #endif
 149
 150         isc_buffer_availableregion(sig, &r);
 151         if (r.length < ISC_SHA1_DIGESTLENGTH * 2 + 1)
 152                 return (ISC_R_NOSPACE);
 153
 154 #if USE_EVP
 155         pkey = EVP_PKEY_new();
 156         if (pkey == NULL)
 157                 return (ISC_R_NOMEMORY);
 158         if (!EVP_PKEY_set1_DSA(pkey, dsa)) {
 159                 EVP_PKEY_free(pkey);
 160                 return (ISC_R_FAILURE);
 161         }
 162         sigbuf = malloc(EVP_PKEY_size(pkey));
 163         if (sigbuf == NULL) {
 164                 EVP_PKEY_free(pkey);
 165                 return (ISC_R_NOMEMORY);
 166         }
 167         if (!EVP_SignFinal(evp_md_ctx, sigbuf, &siglen, pkey)) {
 168                 EVP_PKEY_free(pkey);
 169                 free(sigbuf);
 170                 return (dst__openssl_toresult3(dctx->category,
 171                                                "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_toresult3(dctx->category,
 186                                                "d2i_DSA_SIG",
 187                                                ISC_R_FAILURE));
 188         }
 189         free(sigbuf);
 190
 191 #elif 0
 192         /* Only use EVP for the Digest */
 193         if (!EVP_DigestFinal_ex(evp_md_ctx, digest, &siglen)) {
 194                 return (dst__openssl_toresult3(dctx->category,
 195                                                "EVP_DigestFinal_ex",
 196                                                ISC_R_FAILURE));
 197         }
 198         dsasig = DSA_do_sign(digest, ISC_SHA1_DIGESTLENGTH, dsa);
 199         if (dsasig == NULL)
 200                 return (dst__openssl_toresult3(dctx->category,
 201                                                "DSA_do_sign",
 202                                                DST_R_SIGNFAILURE));
 203 #else
 204         isc_sha1_final(sha1ctx, digest);
 205
 206         dsasig = DSA_do_sign(digest, ISC_SHA1_DIGESTLENGTH, dsa);
 207         if (dsasig == NULL)
 208                 return (dst__openssl_toresult3(dctx->category,
 209                                                "DSA_do_sign",
 210                                                DST_R_SIGNFAILURE));
 211 #endif
 212
 213         klen = (key->key_size - 512)/64;
 214         if (klen > 255)
 215                 return (ISC_R_FAILURE);
 216         *r.base = klen;
 217         isc_region_consume(&r, 1);
 218
 219         BN_bn2bin_fixed(dsasig->r, r.base, ISC_SHA1_DIGESTLENGTH);
 220         isc_region_consume(&r, ISC_SHA1_DIGESTLENGTH);
 221         BN_bn2bin_fixed(dsasig->s, r.base, ISC_SHA1_DIGESTLENGTH);
 222         isc_region_consume(&r, ISC_SHA1_DIGESTLENGTH);
 223         DSA_SIG_free(dsasig);
 224         isc_buffer_add(sig, ISC_SHA1_DIGESTLENGTH * 2 + 1);
 225
 226         return (ISC_R_SUCCESS);
 227 }
 228
 229 static isc_result_t
 230 openssldsa_verify(dst_context_t *dctx, const isc_region_t *sig) {
 231         dst_key_t *key = dctx->key;
 232         DSA *dsa = key->keydata.dsa;
 233         int status = 0;
 234         unsigned char *cp = sig->base;
 235         DSA_SIG *dsasig;
 236 #if USE_EVP
 237         EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;
 238 #if 0
 239         EVP_PKEY *pkey;
 240         unsigned char *sigbuf;
 241 #endif
 242         unsigned int siglen;
 243 #else
 244         isc_sha1_t *sha1ctx = dctx->ctxdata.sha1ctx;
 245 #endif
 246         unsigned char digest[ISC_SHA1_DIGESTLENGTH];
 247
 248
 249 #if USE_EVP
 250 #if 1
 251         /* Only use EVP for the digest */
 252         if (!EVP_DigestFinal_ex(evp_md_ctx, digest, &siglen)) {
 253                 return (ISC_R_FAILURE);
 254         }
 255 #endif
 256 #else
 257         isc_sha1_final(sha1ctx, digest);
 258 #endif
 259
 260         if (sig->length != 2 * ISC_SHA1_DIGESTLENGTH + 1) {
 261                 return (DST_R_VERIFYFAILURE);
 262         }
 263
 264         cp++;   /*%< Skip T */
 265         dsasig = DSA_SIG_new();
 266         if (dsasig == NULL)
 267                 return (ISC_R_NOMEMORY);
 268         dsasig->r = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
 269         cp += ISC_SHA1_DIGESTLENGTH;
 270         dsasig->s = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
 271
 272 #if 0
 273         pkey = EVP_PKEY_new();
 274         if (pkey == NULL)
 275                 return (ISC_R_NOMEMORY);
 276         if (!EVP_PKEY_set1_DSA(pkey, dsa)) {
 277                 EVP_PKEY_free(pkey);
 278                 return (ISC_R_FAILURE);
 279         }
 280         /* Convert to Dss-Sig-Value (RFC2459). */
 281         sigbuf = malloc(EVP_PKEY_size(pkey) + 50);
 282         if (sigbuf == NULL) {
 283                 EVP_PKEY_free(pkey);
 284                 return (ISC_R_NOMEMORY);
 285         }
 286         siglen = (unsigned) i2d_DSA_SIG(dsasig, &sigbuf);
 287         INSIST(EVP_PKEY_size(pkey) >= (int) siglen);
 288         status = EVP_VerifyFinal(evp_md_ctx, sigbuf, siglen, pkey);
 289         EVP_PKEY_free(pkey);
 290         free(sigbuf);
 291 #else
 292         status = DSA_do_verify(digest, ISC_SHA1_DIGESTLENGTH, dsasig, dsa);
 293 #endif
 294         DSA_SIG_free(dsasig);
 295         switch (status) {
 296         case 1:
 297                 return (ISC_R_SUCCESS);
 298         case 0:
 299                 return (dst__openssl_toresult(DST_R_VERIFYFAILURE));
 300         default:
 301                 return (dst__openssl_toresult3(dctx->category,
 302                                                "DSA_do_verify",
 303                                                DST_R_VERIFYFAILURE));
 304         }
 305 }
 306
 307 static isc_boolean_t
 308 openssldsa_compare(const dst_key_t *key1, const dst_key_t *key2) {
 309         int status;
 310         DSA *dsa1, *dsa2;
 311
 312         dsa1 = key1->keydata.dsa;
 313         dsa2 = key2->keydata.dsa;
 314
 315         if (dsa1 == NULL && dsa2 == NULL)
 316                 return (ISC_TRUE);
 317         else if (dsa1 == NULL || dsa2 == NULL)
 318                 return (ISC_FALSE);
 319
 320         status = BN_cmp(dsa1->p, dsa2->p) ||
 321                  BN_cmp(dsa1->q, dsa2->q) ||
 322                  BN_cmp(dsa1->g, dsa2->g) ||
 323                  BN_cmp(dsa1->pub_key, dsa2->pub_key);
 324
 325         if (status != 0)
 326                 return (ISC_FALSE);
 327
 328         if (dsa1->priv_key != NULL || dsa2->priv_key != NULL) {
 329                 if (dsa1->priv_key == NULL || dsa2->priv_key == NULL)
 330                         return (ISC_FALSE);
 331                 if (BN_cmp(dsa1->priv_key, dsa2->priv_key))
 332                         return (ISC_FALSE);
 333         }
 334         return (ISC_TRUE);
 335 }
 336
 337 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 338 static int
 339 progress_cb(int p, int n, BN_GENCB *cb)
 340 {
 341         union {
 342                 void *dptr;
 343                 void (*fptr)(int);
 344         } u;
 345
 346         UNUSED(n);
 347
 348         u.dptr = cb->arg;
 349         if (u.fptr != NULL)
 350                 u.fptr(p);
 351         return (1);
 352 }
 353 #endif
 354
 355 static isc_result_t
 356 openssldsa_generate(dst_key_t *key, int unused, void (*callback)(int)) {
 357         DSA *dsa;
 358         unsigned char rand_array[ISC_SHA1_DIGESTLENGTH];
 359         isc_result_t result;
 360 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 361         BN_GENCB cb;
 362         union {
 363                 void *dptr;
 364                 void (*fptr)(int);
 365         } u;
 366
 367 #else
 368
 369         UNUSED(callback);
 370 #endif
 371         UNUSED(unused);
 372
 373         result = dst__entropy_getdata(rand_array, sizeof(rand_array),
 374                                       ISC_FALSE);
 375         if (result != ISC_R_SUCCESS)
 376                 return (result);
 377
 378 #if OPENSSL_VERSION_NUMBER > 0x00908000L
 379         dsa = DSA_new();
 380         if (dsa == NULL)
 381                 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
 382
 383         if (callback == NULL) {
 384                 BN_GENCB_set_old(&cb, NULL, NULL);
 385         } else {
 386                 u.fptr = callback;
 387                 BN_GENCB_set(&cb, &progress_cb, u.dptr);
 388         }
 389
 390         if (!DSA_generate_parameters_ex(dsa, key->key_size, rand_array,
 391                                         ISC_SHA1_DIGESTLENGTH,  NULL, NULL,
 392                                         &cb))
 393         {
 394                 DSA_free(dsa);
 395                 return (dst__openssl_toresult2("DSA_generate_parameters_ex",
 396                                                DST_R_OPENSSLFAILURE));
 397         }
 398 #else
 399         dsa = DSA_generate_parameters(key->key_size, rand_array,
 400                                       ISC_SHA1_DIGESTLENGTH, NULL, NULL,
 401                                       NULL, NULL);
 402         if (dsa == NULL)
 403                 return (dst__openssl_toresult2("DSA_generate_parameters",
 404                                                DST_R_OPENSSLFAILURE));
 405 #endif
 406
 407         if (DSA_generate_key(dsa) == 0) {
 408                 DSA_free(dsa);
 409                 return (dst__openssl_toresult2("DSA_generate_key",
 410                                                DST_R_OPENSSLFAILURE));
 411         }
 412         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 413
 414         key->keydata.dsa = dsa;
 415
 416         return (ISC_R_SUCCESS);
 417 }
 418
 419 static isc_boolean_t
 420 openssldsa_isprivate(const dst_key_t *key) {
 421         DSA *dsa = key->keydata.dsa;
 422         return (ISC_TF(dsa != NULL && dsa->priv_key != NULL));
 423 }
 424
 425 static void
 426 openssldsa_destroy(dst_key_t *key) {
 427         DSA *dsa = key->keydata.dsa;
 428         DSA_free(dsa);
 429         key->keydata.dsa = NULL;
 430 }
 431
 432
 433 static isc_result_t
 434 openssldsa_todns(const dst_key_t *key, isc_buffer_t *data) {
 435         DSA *dsa;
 436         isc_region_t r;
 437         int dnslen;
 438         unsigned int t, p_bytes;
 439
 440         REQUIRE(key->keydata.dsa != NULL);
 441
 442         dsa = key->keydata.dsa;
 443
 444         isc_buffer_availableregion(data, &r);
 445
 446         t = (BN_num_bytes(dsa->p) - 64) / 8;
 447         if (t > 8)
 448                 return (DST_R_INVALIDPUBLICKEY);
 449         p_bytes = 64 + 8 * t;
 450
 451         dnslen = 1 + (key->key_size * 3)/8 + ISC_SHA1_DIGESTLENGTH;
 452         if (r.length < (unsigned int) dnslen)
 453                 return (ISC_R_NOSPACE);
 454
 455         *r.base = t;
 456         isc_region_consume(&r, 1);
 457         BN_bn2bin_fixed(dsa->q, r.base, ISC_SHA1_DIGESTLENGTH);
 458         isc_region_consume(&r, ISC_SHA1_DIGESTLENGTH);
 459         BN_bn2bin_fixed(dsa->p, r.base, key->key_size/8);
 460         isc_region_consume(&r, p_bytes);
 461         BN_bn2bin_fixed(dsa->g, r.base, key->key_size/8);
 462         isc_region_consume(&r, p_bytes);
 463         BN_bn2bin_fixed(dsa->pub_key, r.base, key->key_size/8);
 464         isc_region_consume(&r, p_bytes);
 465
 466         isc_buffer_add(data, dnslen);
 467
 468         return (ISC_R_SUCCESS);
 469 }
 470
 471 static isc_result_t
 472 openssldsa_fromdns(dst_key_t *key, isc_buffer_t *data) {
 473         DSA *dsa;
 474         isc_region_t r;
 475         unsigned int t, p_bytes;
 476         isc_mem_t *mctx = key->mctx;
 477
 478         UNUSED(mctx);
 479
 480         isc_buffer_remainingregion(data, &r);
 481         if (r.length == 0)
 482                 return (ISC_R_SUCCESS);
 483
 484         dsa = DSA_new();
 485         if (dsa == NULL)
 486                 return (ISC_R_NOMEMORY);
 487         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 488
 489         t = (unsigned int) *r.base;
 490         isc_region_consume(&r, 1);
 491         if (t > 8) {
 492                 DSA_free(dsa);
 493                 return (DST_R_INVALIDPUBLICKEY);
 494         }
 495         p_bytes = 64 + 8 * t;
 496
 497         if (r.length < ISC_SHA1_DIGESTLENGTH + 3 * p_bytes) {
 498                 DSA_free(dsa);
 499                 return (DST_R_INVALIDPUBLICKEY);
 500         }
 501
 502         dsa->q = BN_bin2bn(r.base, ISC_SHA1_DIGESTLENGTH, NULL);
 503         isc_region_consume(&r, ISC_SHA1_DIGESTLENGTH);
 504
 505         dsa->p = BN_bin2bn(r.base, p_bytes, NULL);
 506         isc_region_consume(&r, p_bytes);
 507
 508         dsa->g = BN_bin2bn(r.base, p_bytes, NULL);
 509         isc_region_consume(&r, p_bytes);
 510
 511         dsa->pub_key = BN_bin2bn(r.base, p_bytes, NULL);
 512         isc_region_consume(&r, p_bytes);
 513
 514         key->key_size = p_bytes * 8;
 515
 516         isc_buffer_forward(data, 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes);
 517
 518         key->keydata.dsa = dsa;
 519
 520         return (ISC_R_SUCCESS);
 521 }
 522
 523
 524 static isc_result_t
 525 openssldsa_tofile(const dst_key_t *key, const char *directory) {
 526         int cnt = 0;
 527         DSA *dsa;
 528         dst_private_t priv;
 529         unsigned char bufs[5][128];
 530
 531         if (key->keydata.dsa == NULL)
 532                 return (DST_R_NULLKEY);
 533
 534         if (key->external) {
 535                 priv.nelements = 0;
 536                 return (dst__privstruct_writefile(key, &priv, directory));
 537         }
 538
 539         dsa = key->keydata.dsa;
 540
 541         priv.elements[cnt].tag = TAG_DSA_PRIME;
 542         priv.elements[cnt].length = BN_num_bytes(dsa->p);
 543         BN_bn2bin(dsa->p, bufs[cnt]);
 544         priv.elements[cnt].data = bufs[cnt];
 545         cnt++;
 546
 547         priv.elements[cnt].tag = TAG_DSA_SUBPRIME;
 548         priv.elements[cnt].length = BN_num_bytes(dsa->q);
 549         BN_bn2bin(dsa->q, bufs[cnt]);
 550         priv.elements[cnt].data = bufs[cnt];
 551         cnt++;
 552
 553         priv.elements[cnt].tag = TAG_DSA_BASE;
 554         priv.elements[cnt].length = BN_num_bytes(dsa->g);
 555         BN_bn2bin(dsa->g, bufs[cnt]);
 556         priv.elements[cnt].data = bufs[cnt];
 557         cnt++;
 558
 559         priv.elements[cnt].tag = TAG_DSA_PRIVATE;
 560         priv.elements[cnt].length = BN_num_bytes(dsa->priv_key);
 561         BN_bn2bin(dsa->priv_key, bufs[cnt]);
 562         priv.elements[cnt].data = bufs[cnt];
 563         cnt++;
 564
 565         priv.elements[cnt].tag = TAG_DSA_PUBLIC;
 566         priv.elements[cnt].length = BN_num_bytes(dsa->pub_key);
 567         BN_bn2bin(dsa->pub_key, bufs[cnt]);
 568         priv.elements[cnt].data = bufs[cnt];
 569         cnt++;
 570
 571         priv.nelements = cnt;
 572         return (dst__privstruct_writefile(key, &priv, directory));
 573 }
 574
 575 static isc_result_t
 576 openssldsa_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) {
 577         dst_private_t priv;
 578         isc_result_t ret;
 579         int i;
 580         DSA *dsa = NULL;
 581         isc_mem_t *mctx = key->mctx;
 582 #define DST_RET(a) {ret = a; goto err;}
 583
 584         UNUSED(pub);
 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         dsa = DSA_new();
 592         if (dsa == NULL)
 593                 DST_RET(ISC_R_NOMEMORY);
 594         dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
 595         key->keydata.dsa = dsa;
 596
 597         for (i=0; i < priv.nelements; i++) {
 598                 BIGNUM *bn;
 599                 bn = BN_bin2bn(priv.elements[i].data,
 600                                priv.elements[i].length, NULL);
 601                 if (bn == NULL)
 602                         DST_RET(ISC_R_NOMEMORY);
 603
 604                 switch (priv.elements[i].tag) {
 605                         case TAG_DSA_PRIME:
 606                                 dsa->p = bn;
 607                                 break;
 608                         case TAG_DSA_SUBPRIME:
 609                                 dsa->q = bn;
 610                                 break;
 611                         case TAG_DSA_BASE:
 612                                 dsa->g = bn;
 613                                 break;
 614                         case TAG_DSA_PRIVATE:
 615                                 dsa->priv_key = bn;
 616                                 break;
 617                         case TAG_DSA_PUBLIC:
 618                                 dsa->pub_key = bn;
 619                                 break;
 620                 }
 621         }
 622         dst__privstruct_free(&priv, mctx);
 623
 624         if (key->external) {
 625                 if (pub == NULL)
 626                         DST_RET(DST_R_INVALIDPRIVATEKEY);
 627                 dsa->q = pub->keydata.dsa->q;
 628                 pub->keydata.dsa->q = NULL;
 629                 dsa->p = pub->keydata.dsa->p;
 630                 pub->keydata.dsa->p = NULL;
 631                 dsa->g = pub->keydata.dsa->g;
 632                 pub->keydata.dsa->g =  NULL;
 633                 dsa->pub_key = pub->keydata.dsa->pub_key;
 634                 pub->keydata.dsa->pub_key = NULL;
 635         }
 636
 637         key->key_size = BN_num_bits(dsa->p);
 638
 639         return (ISC_R_SUCCESS);
 640
 641  err:
 642         openssldsa_destroy(key);
 643         dst__privstruct_free(&priv, mctx);
 644         memset(&priv, 0, sizeof(priv));
 645         return (ret);
 646 }
 647
 648 static dst_func_t openssldsa_functions = {
 649         openssldsa_createctx,
 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 */