crypto/dsa/dsa_ameth.c

   1 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   2  * project 2006.
   3  */
   4 /* ====================================================================
   5  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  *
  19  * 3. All advertising materials mentioning features or use of this
  20  *    software must display the following acknowledgment:
  21  *    "This product includes software developed by the OpenSSL Project
  22  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  23  *
  24  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  25  *    endorse or promote products derived from this software without
  26  *    prior written permission. For written permission, please contact
  27  *    licensing@OpenSSL.org.
  28  *
  29  * 5. Products derived from this software may not be called "OpenSSL"
  30  *    nor may "OpenSSL" appear in their names without prior written
  31  *    permission of the OpenSSL Project.
  32  *
  33  * 6. Redistributions of any form whatsoever must retain the following
  34  *    acknowledgment:
  35  *    "This product includes software developed by the OpenSSL Project
  36  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  39  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  41  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  42  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  44  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  45  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  47  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  48  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  49  * OF THE POSSIBILITY OF SUCH DAMAGE.
  50  * ====================================================================
  51  *
  52  * This product includes cryptographic software written by Eric Young
  53  * (eay@cryptsoft.com).  This product includes software written by Tim
  54  * Hudson (tjh@cryptsoft.com).
  55  *
  56  */
  57
  58 #include <stdio.h>
  59 #include "cryptlib.h"
  60 #include <openssl/x509.h>
  61 #include <openssl/asn1.h>
  62 #include <openssl/dsa.h>
  63 #include "asn1_locl.h"
  64
  65 static int dsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
  66         {
  67         const unsigned char *p, *pm;
  68         int pklen, pmlen;
  69         int ptype;
  70         void *pval;
  71         ASN1_STRING *pstr;
  72         X509_ALGOR *palg;
  73         ASN1_INTEGER *public_key = NULL;
  74
  75         DSA *dsa = NULL;
  76
  77         if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
  78                 return 0;
  79         X509_ALGOR_get0(NULL, &ptype, &pval, palg);
  80
  81
  82         if (ptype == V_ASN1_SEQUENCE)
  83                 {
  84                 pstr = pval;
  85                 pm = pstr->data;
  86                 pmlen = pstr->length;
  87
  88                 if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
  89                         {
  90                         DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
  91                         goto err;
  92                         }
  93
  94                 }
  95         else if ((ptype == V_ASN1_NULL) || (ptype == V_ASN1_UNDEF))
  96                 {
  97                 if (!(dsa = DSA_new()))
  98                         {
  99                         DSAerr(DSA_F_DSA_PUB_DECODE, ERR_R_MALLOC_FAILURE);
 100                         goto err;
 101                         }
 102                 }
 103         else
 104                 {
 105                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_PARAMETER_ENCODING_ERROR);
 106                 goto err;
 107                 }
 108
 109         if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen)))
 110                 {
 111                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
 112                 goto err;
 113                 }
 114
 115         if (!(dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
 116                 {
 117                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_BN_DECODE_ERROR);
 118                 goto err;
 119                 }
 120
 121         ASN1_INTEGER_free(public_key);
 122         EVP_PKEY_assign_DSA(pkey, dsa);
 123         return 1;
 124
 125         err:
 126         if (pubkey)
 127                 ASN1_INTEGER_free(public_key);
 128         if (dsa)
 129                 DSA_free(dsa);
 130         return 0;
 131
 132         }
 133
 134 static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
 135         {
 136         DSA *dsa;
 137         void *pval = NULL;
 138         int ptype;
 139         unsigned char *penc = NULL;
 140         int penclen;
 141
 142         dsa=pkey->pkey.dsa;
 143         if (pkey->save_parameters && dsa->p && dsa->q && dsa->g)
 144                 {
 145                 ASN1_STRING *str;
 146                 str = ASN1_STRING_new();
 147                 str->length = i2d_DSAparams(dsa, &str->data);
 148                 if (str->length <= 0)
 149                         {
 150                         DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 151                         goto err;
 152                         }
 153                 pval = str;
 154                 ptype = V_ASN1_SEQUENCE;
 155                 }
 156         else
 157                 ptype = V_ASN1_UNDEF;
 158
 159         dsa->write_params=0;
 160
 161         penclen = i2d_DSAPublicKey(dsa, &penc);
 162
 163         if (penclen <= 0)
 164                 {
 165                 DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 166                 goto err;
 167                 }
 168
 169         if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
 170                                 ptype, pval, penc, penclen))
 171                 return 1;
 172
 173         err:
 174         if (penc)
 175                 OPENSSL_free(penc);
 176         if (pval)
 177                 ASN1_STRING_free(pval);
 178
 179         return 0;
 180         }
 181
 182 /* In PKCS#8 DSA: you just get a private key integer and parameters in the
 183  * AlgorithmIdentifier the pubkey must be recalculated.
 184  */
 185
 186 static int dsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
 187         {
 188         const unsigned char *p, *pm;
 189         int pklen, pmlen;
 190         int ptype;
 191         void *pval;
 192         ASN1_STRING *pstr;
 193         X509_ALGOR *palg;
 194         ASN1_INTEGER *privkey = NULL;
 195         BN_CTX *ctx = NULL;
 196
 197         STACK_OF(ASN1_TYPE) *ndsa = NULL;
 198         DSA *dsa = NULL;
 199
 200         if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
 201                 return 0;
 202         X509_ALGOR_get0(NULL, &ptype, &pval, palg);
 203
 204         /* Check for broken DSA PKCS#8, UGH! */
 205         if (*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
 206                 {
 207                 ASN1_TYPE *t1, *t2;
 208                 if(!(ndsa = ASN1_seq_unpack_ASN1_TYPE(p, pklen,
 209                                                           d2i_ASN1_TYPE,
 210                                                           ASN1_TYPE_free)))
 211                         goto decerr;
 212                 if (sk_ASN1_TYPE_num(ndsa) != 2)
 213                         goto decerr;
 214                 /* Handle Two broken types:
 215                  * SEQUENCE {parameters, priv_key}
 216                  * SEQUENCE {pub_key, priv_key}
 217                  */
 218
 219                 t1 = sk_ASN1_TYPE_value(ndsa, 0);
 220                 t2 = sk_ASN1_TYPE_value(ndsa, 1);
 221                 if (t1->type == V_ASN1_SEQUENCE)
 222                         {
 223                         p8->broken = PKCS8_EMBEDDED_PARAM;
 224                         pval = t1->value.ptr;
 225                         }
 226                 else if (ptype == V_ASN1_SEQUENCE)
 227                         p8->broken = PKCS8_NS_DB;
 228                 else
 229                         goto decerr;
 230
 231                 if (t2->type != V_ASN1_INTEGER)
 232                         goto decerr;
 233
 234                 privkey = t2->value.integer;
 235                 }
 236         else
 237                 {
 238                 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
 239                         goto decerr;
 240                 if (ptype != V_ASN1_SEQUENCE)
 241                         goto decerr;
 242                 }
 243
 244         pstr = pval;
 245         pm = pstr->data;
 246         pmlen = pstr->length;
 247         if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
 248                 goto decerr;
 249         /* We have parameters now set private key */
 250         if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
 251                 {
 252                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
 253                 goto dsaerr;
 254                 }
 255         /* Calculate public key */
 256         if (!(dsa->pub_key = BN_new()))
 257                 {
 258                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 259                 goto dsaerr;
 260                 }
 261         if (!(ctx = BN_CTX_new()))
 262                 {
 263                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 264                 goto dsaerr;
 265                 }
 266
 267         if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx))
 268                 {
 269                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
 270                 goto dsaerr;
 271                 }
 272
 273         EVP_PKEY_assign_DSA(pkey, dsa);
 274         BN_CTX_free (ctx);
 275         if(ndsa)
 276                 sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 277         else
 278                 ASN1_INTEGER_free(privkey);
 279
 280         return 1;
 281
 282         decerr:
 283         DSAerr(DSA_F_DSA_PRIV_DECODE, EVP_R_DECODE_ERROR);
 284         dsaerr:
 285         BN_CTX_free (ctx);
 286         if (privkey)
 287                 ASN1_INTEGER_free(privkey);
 288         sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 289         DSA_free(dsa);
 290         return 0;
 291         }
 292
 293 static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
 294 {
 295         ASN1_STRING *params = NULL;
 296         ASN1_INTEGER *prkey = NULL;
 297         unsigned char *dp = NULL;
 298         int dplen;
 299
 300         params = ASN1_STRING_new();
 301
 302         if (!params)
 303                 {
 304                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 305                 goto err;
 306                 }
 307
 308         params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
 309         if (params->length <= 0)
 310                 {
 311                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 312                 goto err;
 313                 }
 314         params->type = V_ASN1_SEQUENCE;
 315
 316         /* Get private key into integer */
 317         prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
 318
 319         if (!prkey)
 320                 {
 321                 DSAerr(DSA_F_DSA_PRIV_ENCODE,DSA_R_BN_ERROR);
 322                 goto err;
 323                 }
 324
 325         dplen = i2d_ASN1_INTEGER(prkey, &dp);
 326
 327         ASN1_INTEGER_free(prkey);
 328
 329         if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
 330                                 V_ASN1_SEQUENCE, params, dp, dplen))
 331                 goto err;
 332
 333         return 1;
 334
 335 err:
 336         if (dp != NULL)
 337                 OPENSSL_free(dp);
 338         if (params != NULL)
 339                 ASN1_STRING_free(params);
 340         if (prkey != NULL)
 341                 ASN1_INTEGER_free(prkey);
 342         return 0;
 343 }
 344
 345 static int int_dsa_size(const EVP_PKEY *pkey)
 346         {
 347         return(DSA_size(pkey->pkey.dsa));
 348         }
 349
 350 static int dsa_bits(const EVP_PKEY *pkey)
 351         {
 352         return BN_num_bits(pkey->pkey.dsa->p);
 353         }
 354
 355 static int dsa_missing_parameters(const EVP_PKEY *pkey)
 356         {
 357         DSA *dsa;
 358         dsa=pkey->pkey.dsa;
 359         if ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))
 360                         return 1;
 361         return 0;
 362         }
 363
 364 static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
 365         {
 366         BIGNUM *a;
 367
 368         if ((a=BN_dup(from->pkey.dsa->p)) == NULL)
 369                 return 0;
 370         if (to->pkey.dsa->p != NULL)
 371                 BN_free(to->pkey.dsa->p);
 372         to->pkey.dsa->p=a;
 373
 374         if ((a=BN_dup(from->pkey.dsa->q)) == NULL)
 375                 return 0;
 376         if (to->pkey.dsa->q != NULL)
 377                 BN_free(to->pkey.dsa->q);
 378         to->pkey.dsa->q=a;
 379
 380         if ((a=BN_dup(from->pkey.dsa->g)) == NULL)
 381                 return 0;
 382         if (to->pkey.dsa->g != NULL)
 383                 BN_free(to->pkey.dsa->g);
 384         to->pkey.dsa->g=a;
 385         return 1;
 386         }
 387
 388 static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
 389         {
 390         if (    BN_cmp(a->pkey.dsa->p,b->pkey.dsa->p) ||
 391                 BN_cmp(a->pkey.dsa->q,b->pkey.dsa->q) ||
 392                 BN_cmp(a->pkey.dsa->g,b->pkey.dsa->g))
 393                 return 0;
 394         else
 395                 return 1;
 396         }
 397
 398 static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 399         {
 400         if (BN_cmp(b->pkey.dsa->pub_key,a->pkey.dsa->pub_key) != 0)
 401                 return 0;
 402         else
 403                 return 1;
 404         }
 405
 406 static void int_dsa_free(EVP_PKEY *pkey)
 407         {
 408         DSA_free(pkey->pkey.dsa);
 409         }
 410
 411 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
 412         {
 413         size_t i;
 414         if (!b)
 415                 return;
 416         if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
 417                         *pbuflen = i;
 418         }
 419
 420 int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
 421         {
 422         unsigned char *m=NULL;
 423         int ret=0;
 424         size_t buf_len=0;
 425         const char *ktype = NULL;
 426
 427         const BIGNUM *priv_key, *pub_key;
 428
 429         if (ptype == 2)
 430                 priv_key = x->priv_key;
 431         else
 432                 priv_key = NULL;
 433
 434         if (ptype > 0)
 435                 pub_key = x->pub_key;
 436         else
 437                 pub_key = NULL;
 438
 439         if (ptype == 2)
 440                 ktype = "Private-Key";
 441         else if (ptype == 1)
 442                 ktype = "Public-Key";
 443         else
 444                 ktype = "DSA-Parameters";
 445
 446 #if 0
 447         if (x->p == NULL)
 448                 {
 449                 DSAerr(DSA_F_DSA_PRINT,DSA_R_MISSING_PARAMETERS);
 450                 goto err;
 451                 }
 452 #endif
 453
 454         update_buflen(x->p, &buf_len);
 455         update_buflen(x->q, &buf_len);
 456         update_buflen(x->g, &buf_len);
 457         update_buflen(priv_key, &buf_len);
 458         update_buflen(pub_key, &buf_len);
 459
 460         m=(unsigned char *)OPENSSL_malloc(buf_len+10);
 461         if (m == NULL)
 462                 {
 463                 DSAerr(DSA_F_DSA_PRINT,ERR_R_MALLOC_FAILURE);
 464                 goto err;
 465                 }
 466
 467         if (priv_key)
 468                 {
 469                 if(!BIO_indent(bp,off,128))
 470                    goto err;
 471                 if (BIO_printf(bp,"%s: (%d bit)\n",ktype, BN_num_bits(x->p))
 472                         <= 0) goto err;
 473                 }
 474
 475         if (!ASN1_bn_print(bp,"priv:",priv_key,m,off))
 476                 goto err;
 477         if (!ASN1_bn_print(bp,"pub: ",pub_key,m,off))
 478                 goto err;
 479         if (!ASN1_bn_print(bp,"P:   ",x->p,m,off)) goto err;
 480         if (!ASN1_bn_print(bp,"Q:   ",x->q,m,off)) goto err;
 481         if (!ASN1_bn_print(bp,"G:   ",x->g,m,off)) goto err;
 482         ret=1;
 483 err:
 484         if (m != NULL) OPENSSL_free(m);
 485         return(ret);
 486         }
 487
 488 static int dsa_param_decode(EVP_PKEY *pkey,
 489                                         const unsigned char **pder, int derlen)
 490         {
 491         DSA *dsa;
 492         if (!(dsa = d2i_DSAparams(NULL, pder, derlen)))
 493                 {
 494                 DSAerr(DSA_F_DSA_PARAM_DECODE, ERR_R_DSA_LIB);
 495                 return 0;
 496                 }
 497         EVP_PKEY_assign_DSA(pkey, dsa);
 498         return 1;
 499         }
 500
 501 static int dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
 502         {
 503         return i2d_DSAparams(pkey->pkey.dsa, pder);
 504         }
 505
 506 static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 507                                                         ASN1_PCTX *ctx)
 508         {
 509         return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
 510         }
 511
 512 static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 513                                                         ASN1_PCTX *ctx)
 514         {
 515         return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
 516         }
 517
 518
 519 static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 520                                                         ASN1_PCTX *ctx)
 521         {
 522         return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
 523         }
 524
 525 static int old_dsa_priv_decode(EVP_PKEY *pkey,
 526                                         const unsigned char **pder, int derlen)
 527         {
 528         DSA *dsa;
 529         if (!(dsa = d2i_DSAPrivateKey (NULL, pder, derlen)))
 530                 {
 531                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_DSA_LIB);
 532                 return 0;
 533                 }
 534         EVP_PKEY_assign_DSA(pkey, dsa);
 535         return 1;
 536         }
 537
 538 static int old_dsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
 539         {
 540         return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
 541         }
 542
 543 static int dsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
 544         {
 545         switch (op)
 546                 {
 547                 case ASN1_PKEY_CTRL_PKCS7_SIGN:
 548                 if (arg1 == 0)
 549                         {
 550                         X509_ALGOR *alg1, *alg2;
 551                         PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
 552                         X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_sha1),
 553                                                         V_ASN1_NULL, 0);
 554                         X509_ALGOR_set0(alg2, OBJ_nid2obj(NID_dsaWithSHA1),
 555                                                         V_ASN1_UNDEF, 0);
 556                         }
 557                 return 1;
 558
 559                 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
 560                 *(int *)arg2 = NID_sha1;
 561                 return 2;
 562
 563                 default:
 564                 return -2;
 565
 566                 }
 567
 568         }
 569
 570 /* NB these are sorted in pkey_id order, lowest first */
 571
 572 const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] =
 573         {
 574
 575                 {
 576                 EVP_PKEY_DSA2,
 577                 EVP_PKEY_DSA,
 578                 ASN1_PKEY_ALIAS
 579                 },
 580
 581                 {
 582                 EVP_PKEY_DSA1,
 583                 EVP_PKEY_DSA,
 584                 ASN1_PKEY_ALIAS
 585                 },
 586
 587                 {
 588                 EVP_PKEY_DSA4,
 589                 EVP_PKEY_DSA,
 590                 ASN1_PKEY_ALIAS
 591                 },
 592
 593                 {
 594                 EVP_PKEY_DSA3,
 595                 EVP_PKEY_DSA,
 596                 ASN1_PKEY_ALIAS
 597                 },
 598
 599                 {
 600                 EVP_PKEY_DSA,
 601                 EVP_PKEY_DSA,
 602                 0,
 603
 604                 "DSA",
 605                 "OpenSSL DSA method",
 606
 607                 dsa_pub_decode,
 608                 dsa_pub_encode,
 609                 dsa_pub_cmp,
 610                 dsa_pub_print,
 611
 612                 dsa_priv_decode,
 613                 dsa_priv_encode,
 614                 dsa_priv_print,
 615
 616                 int_dsa_size,
 617                 dsa_bits,
 618
 619                 dsa_param_decode,
 620                 dsa_param_encode,
 621                 dsa_missing_parameters,
 622                 dsa_copy_parameters,
 623                 dsa_cmp_parameters,
 624                 dsa_param_print,
 625
 626                 int_dsa_free,
 627                 dsa_pkey_ctrl,
 628                 old_dsa_priv_decode,
 629                 old_dsa_priv_encode
 630                 }
 631         };
 632