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         if (ptype != V_ASN1_SEQUENCE)
  82                 {
  83                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_PARAMETER_ENCODING_ERROR);
  84                 goto err;
  85                 }
  86
  87         pstr = pval;
  88         pm = pstr->data;
  89         pmlen = pstr->length;
  90
  91         if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
  92                 {
  93                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
  94                 goto err;
  95                 }
  96
  97         if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen)))
  98                 {
  99                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
 100                 goto err;
 101                 }
 102
 103         /* We have parameters now set public key */
 104         if (!(dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
 105                 {
 106                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_BN_DECODE_ERROR);
 107                 goto err;
 108                 }
 109
 110         ASN1_INTEGER_free(public_key);
 111
 112         return 1;
 113
 114         err:
 115         if (pubkey)
 116                 ASN1_INTEGER_free(public_key);
 117         if (dsa)
 118                 DSA_free(dsa);
 119         return 0;
 120
 121         }
 122
 123 static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
 124         {
 125         DSA *dsa;
 126         void *pval;
 127         int ptype;
 128         unsigned char *penc = NULL;
 129         int penclen;
 130
 131         dsa=pkey->pkey.dsa;
 132         if (pkey->save_parameters)
 133                 {
 134                 ASN1_STRING *str;
 135                 str = ASN1_STRING_new();
 136                 str->length = i2d_DSAparams(dsa, &str->data);
 137                 if (str->length <= 0)
 138                         {
 139                         DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 140                         goto err;
 141                         }
 142                 ptype = V_ASN1_SEQUENCE;
 143                 }
 144         else
 145                 {
 146                 ptype = V_ASN1_UNDEF;
 147                 pval = NULL;
 148                 }
 149         dsa->write_params=0;
 150
 151         penclen = i2d_DSAPublicKey(dsa, &penc);
 152
 153         if (penclen <= 0)
 154                 {
 155                 DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 156                 goto err;
 157                 }
 158
 159         if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
 160                                 ptype, pval, penc, penclen))
 161                 return 1;
 162
 163         err:
 164         if (penc)
 165                 OPENSSL_free(penc);
 166         if (pval)
 167                 ASN1_STRING_free(pval);
 168
 169         return 0;
 170         }
 171
 172 static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 173         {
 174         if (BN_cmp(b->pkey.dsa->pub_key,a->pkey.dsa->pub_key) != 0)
 175                 return 0;
 176         else
 177                 return 1;
 178         }
 179
 180 /* In PKCS#8 DSA: you just get a private key integer and parameters in the
 181  * AlgorithmIdentifier the pubkey must be recalculated.
 182  */
 183
 184 static int dsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
 185         {
 186         const unsigned char *p, *pm;
 187         int pklen, pmlen;
 188         int ptype;
 189         void *pval;
 190         ASN1_STRING *pstr;
 191         X509_ALGOR *palg;
 192         ASN1_INTEGER *privkey = NULL;
 193         BN_CTX *ctx = NULL;
 194
 195         STACK_OF(ASN1_TYPE) *ndsa = NULL;
 196         DSA *dsa = NULL;
 197
 198         if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
 199                 return 0;
 200         X509_ALGOR_get0(NULL, &ptype, &pval, palg);
 201
 202         /* Check for broken DSA PKCS#8, UGH! */
 203         if (*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
 204                 {
 205                 ASN1_TYPE *t1, *t2;
 206                 if(!(ndsa = ASN1_seq_unpack_ASN1_TYPE(p, pklen,
 207                                                           d2i_ASN1_TYPE,
 208                                                           ASN1_TYPE_free)))
 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         sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 285         DSA_free(dsa);
 286         EVP_PKEY_free(pkey);
 287         return 0;
 288         }
 289
 290 static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
 291 {
 292         ASN1_STRING *params = NULL;
 293         ASN1_INTEGER *prkey = NULL;
 294         unsigned char *dp = NULL;
 295         int dplen;
 296
 297         params = ASN1_STRING_new();
 298
 299         if (!params)
 300                 {
 301                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 302                 goto err;
 303                 }
 304
 305         params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
 306         if (params->length <= 0)
 307                 {
 308                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 309                 goto err;
 310                 }
 311         params->type = V_ASN1_SEQUENCE;
 312
 313         /* Get private key into integer */
 314         prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
 315
 316         if (!prkey)
 317                 {
 318                 DSAerr(DSA_F_DSA_PRIV_ENCODE,DSA_R_BN_ERROR);
 319                 goto err;
 320                 }
 321
 322         dplen = i2d_ASN1_INTEGER(prkey, &dp);
 323
 324         ASN1_INTEGER_free(prkey);
 325
 326         if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
 327                                 V_ASN1_SEQUENCE, params, dp, dplen))
 328                 goto err;
 329
 330         return 1;
 331
 332 err:
 333         if (dp != NULL)
 334                 OPENSSL_free(dp);
 335         if (params != NULL)
 336                 ASN1_STRING_free(params);
 337         if (prkey != NULL)
 338                 ASN1_INTEGER_free(prkey);
 339         return 0;
 340 }
 341
 342 static int int_dsa_size(const EVP_PKEY *pkey)
 343         {
 344         return(DSA_size(pkey->pkey.dsa));
 345         }
 346
 347 static int dsa_bits(const EVP_PKEY *pkey)
 348         {
 349         return BN_num_bits(pkey->pkey.dsa->p);
 350         }
 351
 352 static int dsa_missing_parameters(const EVP_PKEY *pkey)
 353         {
 354         DSA *dsa;
 355         dsa=pkey->pkey.dsa;
 356         if ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))
 357                         return 1;
 358         return 0;
 359         }
 360
 361 static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
 362         {
 363         BIGNUM *a;
 364
 365         if ((a=BN_dup(from->pkey.dsa->p)) == NULL)
 366                 return 0;
 367         if (to->pkey.dsa->p != NULL)
 368                 BN_free(to->pkey.dsa->p);
 369         to->pkey.dsa->p=a;
 370
 371         if ((a=BN_dup(from->pkey.dsa->q)) == NULL)
 372                 return 0;
 373         if (to->pkey.dsa->q != NULL)
 374                 BN_free(to->pkey.dsa->q);
 375         to->pkey.dsa->q=a;
 376
 377         if ((a=BN_dup(from->pkey.dsa->g)) == NULL)
 378                 return 0;
 379         if (to->pkey.dsa->g != NULL)
 380                 BN_free(to->pkey.dsa->g);
 381         to->pkey.dsa->g=a;
 382         return 1;
 383         }
 384
 385 static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
 386         {
 387         if (    BN_cmp(a->pkey.dsa->p,b->pkey.dsa->p) ||
 388                 BN_cmp(a->pkey.dsa->q,b->pkey.dsa->q) ||
 389                 BN_cmp(a->pkey.dsa->g,b->pkey.dsa->g))
 390                 return 0;
 391         else
 392                 return 1;
 393         }
 394
 395 static void int_dsa_free(EVP_PKEY *pkey)
 396         {
 397         DSA_free(pkey->pkey.dsa);
 398         }
 399
 400 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
 401         {
 402         int i;
 403         if (!b)
 404                 return;
 405         if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
 406                         *pbuflen = i;
 407         }
 408
 409 int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
 410         {
 411         unsigned char *m=NULL;
 412         int ret=0;
 413         size_t buf_len=0;
 414         const char *ktype = NULL;
 415
 416         const BIGNUM *priv_key, *pub_key;
 417
 418         if (ptype == 2)
 419                 priv_key = x->priv_key;
 420         else
 421                 priv_key = NULL;
 422
 423         if (ptype > 0)
 424                 pub_key = x->pub_key;
 425         else
 426                 pub_key = NULL;
 427
 428         if (ptype == 2)
 429                 ktype = "Private-Key";
 430         else if (ptype == 1)
 431                 ktype = "Public-Key";
 432         else
 433                 ktype = "DSA-Parameters";
 434
 435         if (x->p == NULL)
 436                 {
 437                 DSAerr(DSA_F_DSA_PRINT,DSA_R_MISSING_PARAMETERS);
 438                 goto err;
 439                 }
 440
 441         update_buflen(x->p, &buf_len);
 442         update_buflen(x->q, &buf_len);
 443         update_buflen(x->g, &buf_len);
 444         update_buflen(priv_key, &buf_len);
 445         update_buflen(pub_key, &buf_len);
 446
 447         m=(unsigned char *)OPENSSL_malloc(buf_len+10);
 448         if (m == NULL)
 449                 {
 450                 DSAerr(DSA_F_DSA_PRINT,ERR_R_MALLOC_FAILURE);
 451                 goto err;
 452                 }
 453
 454         if (priv_key)
 455                 {
 456                 if(!BIO_indent(bp,off,128))
 457                    goto err;
 458                 if (BIO_printf(bp,"%s: (%d bit)\n",ktype, BN_num_bits(x->p))
 459                         <= 0) goto err;
 460                 }
 461
 462         if (!ASN1_bn_print(bp,"priv:",priv_key,m,off))
 463                 goto err;
 464         if (!ASN1_bn_print(bp,"pub: ",pub_key,m,off))
 465                 goto err;
 466         if (!ASN1_bn_print(bp,"P:   ",x->p,m,off)) goto err;
 467         if (!ASN1_bn_print(bp,"Q:   ",x->q,m,off)) goto err;
 468         if (!ASN1_bn_print(bp,"G:   ",x->g,m,off)) goto err;
 469         ret=1;
 470 err:
 471         if (m != NULL) OPENSSL_free(m);
 472         return(ret);
 473         }
 474
 475
 476 static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 477                                                         ASN1_PCTX *ctx)
 478         {
 479         return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
 480         }
 481
 482 static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 483                                                         ASN1_PCTX *ctx)
 484         {
 485         return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
 486         }
 487
 488
 489 static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 490                                                         ASN1_PCTX *ctx)
 491         {
 492         return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
 493         }
 494
 495 /* NB these are sorted in pkey_id order, lowest first */
 496
 497 const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] =
 498         {
 499
 500                 {
 501                 EVP_PKEY_DSA2,
 502                 EVP_PKEY_DSA,
 503                 ASN1_PKEY_ALIAS
 504                 },
 505
 506                 {
 507                 EVP_PKEY_DSA1,
 508                 EVP_PKEY_DSA,
 509                 ASN1_PKEY_ALIAS
 510                 },
 511
 512                 {
 513                 EVP_PKEY_DSA4,
 514                 EVP_PKEY_DSA,
 515                 ASN1_PKEY_ALIAS
 516                 },
 517
 518                 {
 519                 EVP_PKEY_DSA3,
 520                 EVP_PKEY_DSA,
 521                 ASN1_PKEY_ALIAS
 522                 },
 523
 524                 {
 525                 EVP_PKEY_DSA,
 526                 EVP_PKEY_DSA,
 527                 0,
 528
 529                 "dsa",
 530                 "OpenSSL DSA method",
 531
 532                 dsa_pub_decode,
 533                 dsa_pub_encode,
 534                 dsa_pub_cmp,
 535                 dsa_pub_print,
 536
 537                 dsa_priv_decode,
 538                 dsa_priv_encode,
 539                 dsa_priv_print,
 540
 541                 int_dsa_size,
 542                 dsa_bits,
 543
 544                 0,0,
 545                 dsa_missing_parameters,
 546                 dsa_copy_parameters,
 547                 dsa_cmp_parameters,
 548                 dsa_param_print,
 549
 550                 int_dsa_free,
 551                 0
 552                 }
 553         };
 554