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 (public_key)
 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 = d2i_ASN1_SEQUENCE_ANY(NULL, &p, pklen)));
 209                         goto decerr;
 210                 if (sk_ASN1_TYPE_num(ndsa) != 2)
 211                         goto decerr;
 212                 /* Handle Two broken types:
 213                  * SEQUENCE {parameters, priv_key}
 214                  * SEQUENCE {pub_key, priv_key}
 215                  */
 216
 217                 t1 = sk_ASN1_TYPE_value(ndsa, 0);
 218                 t2 = sk_ASN1_TYPE_value(ndsa, 1);
 219                 if (t1->type == V_ASN1_SEQUENCE)
 220                         {
 221                         p8->broken = PKCS8_EMBEDDED_PARAM;
 222                         pval = t1->value.ptr;
 223                         }
 224                 else if (ptype == V_ASN1_SEQUENCE)
 225                         p8->broken = PKCS8_NS_DB;
 226                 else
 227                         goto decerr;
 228
 229                 if (t2->type != V_ASN1_INTEGER)
 230                         goto decerr;
 231
 232                 privkey = t2->value.integer;
 233                 }
 234         else
 235                 {
 236                 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
 237                         goto decerr;
 238                 if (ptype != V_ASN1_SEQUENCE)
 239                         goto decerr;
 240                 }
 241
 242         pstr = pval;
 243         pm = pstr->data;
 244         pmlen = pstr->length;
 245         if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
 246                 goto decerr;
 247         /* We have parameters now set private key */
 248         if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
 249                 {
 250                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
 251                 goto dsaerr;
 252                 }
 253         /* Calculate public key */
 254         if (!(dsa->pub_key = BN_new()))
 255                 {
 256                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 257                 goto dsaerr;
 258                 }
 259         if (!(ctx = BN_CTX_new()))
 260                 {
 261                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 262                 goto dsaerr;
 263                 }
 264
 265         if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx))
 266                 {
 267                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
 268                 goto dsaerr;
 269                 }
 270
 271         EVP_PKEY_assign_DSA(pkey, dsa);
 272         BN_CTX_free (ctx);
 273         if(ndsa)
 274                 sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 275         else
 276                 ASN1_INTEGER_free(privkey);
 277
 278         return 1;
 279
 280         decerr:
 281         DSAerr(DSA_F_DSA_PRIV_DECODE, EVP_R_DECODE_ERROR);
 282         dsaerr:
 283         BN_CTX_free (ctx);
 284         if (privkey)
 285                 ASN1_INTEGER_free(privkey);
 286         sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 287         DSA_free(dsa);
 288         return 0;
 289         }
 290
 291 static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
 292 {
 293         ASN1_STRING *params = NULL;
 294         ASN1_INTEGER *prkey = NULL;
 295         unsigned char *dp = NULL;
 296         int dplen;
 297
 298         params = ASN1_STRING_new();
 299
 300         if (!params)
 301                 {
 302                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 303                 goto err;
 304                 }
 305
 306         params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
 307         if (params->length <= 0)
 308                 {
 309                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 310                 goto err;
 311                 }
 312         params->type = V_ASN1_SEQUENCE;
 313
 314         /* Get private key into integer */
 315         prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
 316
 317         if (!prkey)
 318                 {
 319                 DSAerr(DSA_F_DSA_PRIV_ENCODE,DSA_R_BN_ERROR);
 320                 goto err;
 321                 }
 322
 323         dplen = i2d_ASN1_INTEGER(prkey, &dp);
 324
 325         ASN1_INTEGER_free(prkey);
 326
 327         if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
 328                                 V_ASN1_SEQUENCE, params, dp, dplen))
 329                 goto err;
 330
 331         return 1;
 332
 333 err:
 334         if (dp != NULL)
 335                 OPENSSL_free(dp);
 336         if (params != NULL)
 337                 ASN1_STRING_free(params);
 338         if (prkey != NULL)
 339                 ASN1_INTEGER_free(prkey);
 340         return 0;
 341 }
 342
 343 static int int_dsa_size(const EVP_PKEY *pkey)
 344         {
 345         return(DSA_size(pkey->pkey.dsa));
 346         }
 347
 348 static int dsa_bits(const EVP_PKEY *pkey)
 349         {
 350         return BN_num_bits(pkey->pkey.dsa->p);
 351         }
 352
 353 static int dsa_missing_parameters(const EVP_PKEY *pkey)
 354         {
 355         DSA *dsa;
 356         dsa=pkey->pkey.dsa;
 357         if ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))
 358                         return 1;
 359         return 0;
 360         }
 361
 362 static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
 363         {
 364         BIGNUM *a;
 365
 366         if ((a=BN_dup(from->pkey.dsa->p)) == NULL)
 367                 return 0;
 368         if (to->pkey.dsa->p != NULL)
 369                 BN_free(to->pkey.dsa->p);
 370         to->pkey.dsa->p=a;
 371
 372         if ((a=BN_dup(from->pkey.dsa->q)) == NULL)
 373                 return 0;
 374         if (to->pkey.dsa->q != NULL)
 375                 BN_free(to->pkey.dsa->q);
 376         to->pkey.dsa->q=a;
 377
 378         if ((a=BN_dup(from->pkey.dsa->g)) == NULL)
 379                 return 0;
 380         if (to->pkey.dsa->g != NULL)
 381                 BN_free(to->pkey.dsa->g);
 382         to->pkey.dsa->g=a;
 383         return 1;
 384         }
 385
 386 static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
 387         {
 388         if (    BN_cmp(a->pkey.dsa->p,b->pkey.dsa->p) ||
 389                 BN_cmp(a->pkey.dsa->q,b->pkey.dsa->q) ||
 390                 BN_cmp(a->pkey.dsa->g,b->pkey.dsa->g))
 391                 return 0;
 392         else
 393                 return 1;
 394         }
 395
 396 static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 397         {
 398         if (BN_cmp(b->pkey.dsa->pub_key,a->pkey.dsa->pub_key) != 0)
 399                 return 0;
 400         else
 401                 return 1;
 402         }
 403
 404 static void int_dsa_free(EVP_PKEY *pkey)
 405         {
 406         DSA_free(pkey->pkey.dsa);
 407         }
 408
 409 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
 410         {
 411         size_t i;
 412         if (!b)
 413                 return;
 414         if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
 415                         *pbuflen = i;
 416         }
 417
 418 static int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
 419         {
 420         unsigned char *m=NULL;
 421         int ret=0;
 422         size_t buf_len=0;
 423         const char *ktype = NULL;
 424
 425         const BIGNUM *priv_key, *pub_key;
 426
 427         if (ptype == 2)
 428                 priv_key = x->priv_key;
 429         else
 430                 priv_key = NULL;
 431
 432         if (ptype > 0)
 433                 pub_key = x->pub_key;
 434         else
 435                 pub_key = NULL;
 436
 437         if (ptype == 2)
 438                 ktype = "Private-Key";
 439         else if (ptype == 1)
 440                 ktype = "Public-Key";
 441         else
 442                 ktype = "DSA-Parameters";
 443
 444         update_buflen(x->p, &buf_len);
 445         update_buflen(x->q, &buf_len);
 446         update_buflen(x->g, &buf_len);
 447         update_buflen(priv_key, &buf_len);
 448         update_buflen(pub_key, &buf_len);
 449
 450         m=(unsigned char *)OPENSSL_malloc(buf_len+10);
 451         if (m == NULL)
 452                 {
 453                 DSAerr(DSA_F_DO_DSA_PRINT,ERR_R_MALLOC_FAILURE);
 454                 goto err;
 455                 }
 456
 457         if (priv_key)
 458                 {
 459                 if(!BIO_indent(bp,off,128))
 460                    goto err;
 461                 if (BIO_printf(bp,"%s: (%d bit)\n",ktype, BN_num_bits(x->p))
 462                         <= 0) goto err;
 463                 }
 464
 465         if (!ASN1_bn_print(bp,"priv:",priv_key,m,off))
 466                 goto err;
 467         if (!ASN1_bn_print(bp,"pub: ",pub_key,m,off))
 468                 goto err;
 469         if (!ASN1_bn_print(bp,"P:   ",x->p,m,off)) goto err;
 470         if (!ASN1_bn_print(bp,"Q:   ",x->q,m,off)) goto err;
 471         if (!ASN1_bn_print(bp,"G:   ",x->g,m,off)) goto err;
 472         ret=1;
 473 err:
 474         if (m != NULL) OPENSSL_free(m);
 475         return(ret);
 476         }
 477
 478 static int dsa_param_decode(EVP_PKEY *pkey,
 479                                         const unsigned char **pder, int derlen)
 480         {
 481         DSA *dsa;
 482         if (!(dsa = d2i_DSAparams(NULL, pder, derlen)))
 483                 {
 484                 DSAerr(DSA_F_DSA_PARAM_DECODE, ERR_R_DSA_LIB);
 485                 return 0;
 486                 }
 487         EVP_PKEY_assign_DSA(pkey, dsa);
 488         return 1;
 489         }
 490
 491 static int dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
 492         {
 493         return i2d_DSAparams(pkey->pkey.dsa, pder);
 494         }
 495
 496 static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 497                                                         ASN1_PCTX *ctx)
 498         {
 499         return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
 500         }
 501
 502 static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 503                                                         ASN1_PCTX *ctx)
 504         {
 505         return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
 506         }
 507
 508
 509 static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 510                                                         ASN1_PCTX *ctx)
 511         {
 512         return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
 513         }
 514
 515 static int old_dsa_priv_decode(EVP_PKEY *pkey,
 516                                         const unsigned char **pder, int derlen)
 517         {
 518         DSA *dsa;
 519         if (!(dsa = d2i_DSAPrivateKey (NULL, pder, derlen)))
 520                 {
 521                 DSAerr(DSA_F_OLD_DSA_PRIV_DECODE, ERR_R_DSA_LIB);
 522                 return 0;
 523                 }
 524         EVP_PKEY_assign_DSA(pkey, dsa);
 525         return 1;
 526         }
 527
 528 static int old_dsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
 529         {
 530         return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
 531         }
 532
 533 static int dsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
 534         {
 535         switch (op)
 536                 {
 537                 case ASN1_PKEY_CTRL_PKCS7_SIGN:
 538                 if (arg1 == 0)
 539                         {
 540                         int snid, hnid;
 541                         X509_ALGOR *alg1, *alg2;
 542                         PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
 543                         if (alg1 == NULL || alg1->algorithm == NULL)
 544                                 return -1;
 545                         hnid = OBJ_obj2nid(alg1->algorithm);
 546                         if (hnid == NID_undef)
 547                                 return -1;
 548                         if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
 549                                 return -1;
 550                         X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
 551                         }
 552                 return 1;
 553
 554                 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
 555                 *(int *)arg2 = NID_sha1;
 556                 return 2;
 557
 558                 default:
 559                 return -2;
 560
 561                 }
 562
 563         }
 564
 565 /* NB these are sorted in pkey_id order, lowest first */
 566
 567 const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] =
 568         {
 569
 570                 {
 571                 EVP_PKEY_DSA2,
 572                 EVP_PKEY_DSA,
 573                 ASN1_PKEY_ALIAS
 574                 },
 575
 576                 {
 577                 EVP_PKEY_DSA1,
 578                 EVP_PKEY_DSA,
 579                 ASN1_PKEY_ALIAS
 580                 },
 581
 582                 {
 583                 EVP_PKEY_DSA4,
 584                 EVP_PKEY_DSA,
 585                 ASN1_PKEY_ALIAS
 586                 },
 587
 588                 {
 589                 EVP_PKEY_DSA3,
 590                 EVP_PKEY_DSA,
 591                 ASN1_PKEY_ALIAS
 592                 },
 593
 594                 {
 595                 EVP_PKEY_DSA,
 596                 EVP_PKEY_DSA,
 597                 0,
 598
 599                 "DSA",
 600                 "OpenSSL DSA method",
 601
 602                 dsa_pub_decode,
 603                 dsa_pub_encode,
 604                 dsa_pub_cmp,
 605                 dsa_pub_print,
 606
 607                 dsa_priv_decode,
 608                 dsa_priv_encode,
 609                 dsa_priv_print,
 610
 611                 int_dsa_size,
 612                 dsa_bits,
 613
 614                 dsa_param_decode,
 615                 dsa_param_encode,
 616                 dsa_missing_parameters,
 617                 dsa_copy_parameters,
 618                 dsa_cmp_parameters,
 619                 dsa_param_print,
 620
 621                 int_dsa_free,
 622                 dsa_pkey_ctrl,
 623                 old_dsa_priv_decode,
 624                 old_dsa_priv_encode
 625                 }
 626         };
 627