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         EVP_PKEY_assign_DSA(pkey, dsa);
 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 = NULL;
 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                 pval = str;
 143                 ptype = V_ASN1_SEQUENCE;
 144                 }
 145         else
 146                 ptype = V_ASN1_UNDEF;
 147         dsa->write_params=0;
 148
 149         penclen = i2d_DSAPublicKey(dsa, &penc);
 150
 151         if (penclen <= 0)
 152                 {
 153                 DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 154                 goto err;
 155                 }
 156
 157         if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
 158                                 ptype, pval, penc, penclen))
 159                 return 1;
 160
 161         err:
 162         if (penc)
 163                 OPENSSL_free(penc);
 164         if (pval)
 165                 ASN1_STRING_free(pval);
 166
 167         return 0;
 168         }
 169
 170 static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 171         {
 172         if (BN_cmp(b->pkey.dsa->pub_key,a->pkey.dsa->pub_key) != 0)
 173                 return 0;
 174         else
 175                 return 1;
 176         }
 177
 178 /* In PKCS#8 DSA: you just get a private key integer and parameters in the
 179  * AlgorithmIdentifier the pubkey must be recalculated.
 180  */
 181
 182 static int dsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
 183         {
 184         const unsigned char *p, *pm;
 185         int pklen, pmlen;
 186         int ptype;
 187         void *pval;
 188         ASN1_STRING *pstr;
 189         X509_ALGOR *palg;
 190         ASN1_INTEGER *privkey = NULL;
 191         BN_CTX *ctx = NULL;
 192
 193         STACK_OF(ASN1_TYPE) *ndsa = NULL;
 194         DSA *dsa = NULL;
 195
 196         if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
 197                 return 0;
 198         X509_ALGOR_get0(NULL, &ptype, &pval, palg);
 199
 200         /* Check for broken DSA PKCS#8, UGH! */
 201         if (*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
 202                 {
 203                 ASN1_TYPE *t1, *t2;
 204                 if(!(ndsa = ASN1_seq_unpack_ASN1_TYPE(p, pklen,
 205                                                           d2i_ASN1_TYPE,
 206                                                           ASN1_TYPE_free)))
 207                         goto decerr;
 208                 if (sk_ASN1_TYPE_num(ndsa) != 2)
 209                         goto decerr;
 210                 /* Handle Two broken types:
 211                  * SEQUENCE {parameters, priv_key}
 212                  * SEQUENCE {pub_key, priv_key}
 213                  */
 214
 215                 t1 = sk_ASN1_TYPE_value(ndsa, 0);
 216                 t2 = sk_ASN1_TYPE_value(ndsa, 1);
 217                 if (t1->type == V_ASN1_SEQUENCE)
 218                         {
 219                         p8->broken = PKCS8_EMBEDDED_PARAM;
 220                         pval = t1->value.ptr;
 221                         }
 222                 else if (ptype == V_ASN1_SEQUENCE)
 223                         p8->broken = PKCS8_NS_DB;
 224                 else
 225                         goto decerr;
 226
 227                 if (t2->type != V_ASN1_INTEGER)
 228                         goto decerr;
 229
 230                 privkey = t2->value.integer;
 231                 }
 232         else
 233                 {
 234                 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
 235                         goto decerr;
 236                 if (ptype != V_ASN1_SEQUENCE)
 237                         goto decerr;
 238                 }
 239
 240         pstr = pval;
 241         pm = pstr->data;
 242         pmlen = pstr->length;
 243         if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
 244                 goto decerr;
 245         /* We have parameters now set private key */
 246         if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
 247                 {
 248                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
 249                 goto dsaerr;
 250                 }
 251         /* Calculate public key */
 252         if (!(dsa->pub_key = BN_new()))
 253                 {
 254                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 255                 goto dsaerr;
 256                 }
 257         if (!(ctx = BN_CTX_new()))
 258                 {
 259                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 260                 goto dsaerr;
 261                 }
 262
 263         if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx))
 264                 {
 265                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
 266                 goto dsaerr;
 267                 }
 268
 269         EVP_PKEY_assign_DSA(pkey, dsa);
 270         BN_CTX_free (ctx);
 271         if(ndsa)
 272                 sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 273         else
 274                 ASN1_INTEGER_free(privkey);
 275
 276         return 1;
 277
 278         decerr:
 279         DSAerr(DSA_F_DSA_PRIV_DECODE, EVP_R_DECODE_ERROR);
 280         dsaerr:
 281         BN_CTX_free (ctx);
 282         sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 283         DSA_free(dsa);
 284         return 0;
 285         }
 286
 287 static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
 288 {
 289         ASN1_STRING *params = NULL;
 290         ASN1_INTEGER *prkey = NULL;
 291         unsigned char *dp = NULL;
 292         int dplen;
 293
 294         params = ASN1_STRING_new();
 295
 296         if (!params)
 297                 {
 298                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 299                 goto err;
 300                 }
 301
 302         params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
 303         if (params->length <= 0)
 304                 {
 305                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 306                 goto err;
 307                 }
 308         params->type = V_ASN1_SEQUENCE;
 309
 310         /* Get private key into integer */
 311         prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
 312
 313         if (!prkey)
 314                 {
 315                 DSAerr(DSA_F_DSA_PRIV_ENCODE,DSA_R_BN_ERROR);
 316                 goto err;
 317                 }
 318
 319         dplen = i2d_ASN1_INTEGER(prkey, &dp);
 320
 321         ASN1_INTEGER_free(prkey);
 322
 323         if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
 324                                 V_ASN1_SEQUENCE, params, dp, dplen))
 325                 goto err;
 326
 327         return 1;
 328
 329 err:
 330         if (dp != NULL)
 331                 OPENSSL_free(dp);
 332         if (params != NULL)
 333                 ASN1_STRING_free(params);
 334         if (prkey != NULL)
 335                 ASN1_INTEGER_free(prkey);
 336         return 0;
 337 }
 338
 339 static int int_dsa_size(const EVP_PKEY *pkey)
 340         {
 341         return(DSA_size(pkey->pkey.dsa));
 342         }
 343
 344 static int dsa_bits(const EVP_PKEY *pkey)
 345         {
 346         return BN_num_bits(pkey->pkey.dsa->p);
 347         }
 348
 349 static int dsa_missing_parameters(const EVP_PKEY *pkey)
 350         {
 351         DSA *dsa;
 352         dsa=pkey->pkey.dsa;
 353         if ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))
 354                         return 1;
 355         return 0;
 356         }
 357
 358 static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
 359         {
 360         BIGNUM *a;
 361
 362         if ((a=BN_dup(from->pkey.dsa->p)) == NULL)
 363                 return 0;
 364         if (to->pkey.dsa->p != NULL)
 365                 BN_free(to->pkey.dsa->p);
 366         to->pkey.dsa->p=a;
 367
 368         if ((a=BN_dup(from->pkey.dsa->q)) == NULL)
 369                 return 0;
 370         if (to->pkey.dsa->q != NULL)
 371                 BN_free(to->pkey.dsa->q);
 372         to->pkey.dsa->q=a;
 373
 374         if ((a=BN_dup(from->pkey.dsa->g)) == NULL)
 375                 return 0;
 376         if (to->pkey.dsa->g != NULL)
 377                 BN_free(to->pkey.dsa->g);
 378         to->pkey.dsa->g=a;
 379         return 1;
 380         }
 381
 382 static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
 383         {
 384         if (    BN_cmp(a->pkey.dsa->p,b->pkey.dsa->p) ||
 385                 BN_cmp(a->pkey.dsa->q,b->pkey.dsa->q) ||
 386                 BN_cmp(a->pkey.dsa->g,b->pkey.dsa->g))
 387                 return 0;
 388         else
 389                 return 1;
 390         }
 391
 392 static void int_dsa_free(EVP_PKEY *pkey)
 393         {
 394         DSA_free(pkey->pkey.dsa);
 395         }
 396
 397 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
 398         {
 399         int i;
 400         if (!b)
 401                 return;
 402         if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
 403                         *pbuflen = i;
 404         }
 405
 406 int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
 407         {
 408         unsigned char *m=NULL;
 409         int ret=0;
 410         size_t buf_len=0;
 411         const char *ktype = NULL;
 412
 413         const BIGNUM *priv_key, *pub_key;
 414
 415         if (ptype == 2)
 416                 priv_key = x->priv_key;
 417         else
 418                 priv_key = NULL;
 419
 420         if (ptype > 0)
 421                 pub_key = x->pub_key;
 422         else
 423                 pub_key = NULL;
 424
 425         if (ptype == 2)
 426                 ktype = "Private-Key";
 427         else if (ptype == 1)
 428                 ktype = "Public-Key";
 429         else
 430                 ktype = "DSA-Parameters";
 431
 432         if (x->p == NULL)
 433                 {
 434                 DSAerr(DSA_F_DSA_PRINT,DSA_R_MISSING_PARAMETERS);
 435                 goto err;
 436                 }
 437
 438         update_buflen(x->p, &buf_len);
 439         update_buflen(x->q, &buf_len);
 440         update_buflen(x->g, &buf_len);
 441         update_buflen(priv_key, &buf_len);
 442         update_buflen(pub_key, &buf_len);
 443
 444         m=(unsigned char *)OPENSSL_malloc(buf_len+10);
 445         if (m == NULL)
 446                 {
 447                 DSAerr(DSA_F_DSA_PRINT,ERR_R_MALLOC_FAILURE);
 448                 goto err;
 449                 }
 450
 451         if (priv_key)
 452                 {
 453                 if(!BIO_indent(bp,off,128))
 454                    goto err;
 455                 if (BIO_printf(bp,"%s: (%d bit)\n",ktype, BN_num_bits(x->p))
 456                         <= 0) goto err;
 457                 }
 458
 459         if (!ASN1_bn_print(bp,"priv:",priv_key,m,off))
 460                 goto err;
 461         if (!ASN1_bn_print(bp,"pub: ",pub_key,m,off))
 462                 goto err;
 463         if (!ASN1_bn_print(bp,"P:   ",x->p,m,off)) goto err;
 464         if (!ASN1_bn_print(bp,"Q:   ",x->q,m,off)) goto err;
 465         if (!ASN1_bn_print(bp,"G:   ",x->g,m,off)) goto err;
 466         ret=1;
 467 err:
 468         if (m != NULL) OPENSSL_free(m);
 469         return(ret);
 470         }
 471
 472 static int dsa_param_decode(EVP_PKEY *pkey,
 473                                         const unsigned char **pder, int derlen)
 474         {
 475         DSA *dsa;
 476         if (!(dsa = d2i_DSAparams(NULL, pder, derlen)))
 477                 {
 478                 DSAerr(DSA_F_DSA_PARAM_DECODE, ERR_R_DSA_LIB);
 479                 return 0;
 480                 }
 481         EVP_PKEY_assign_DSA(pkey, dsa);
 482         return 1;
 483         }
 484
 485 static int dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
 486         {
 487         return i2d_DSAparams(pkey->pkey.dsa, pder);
 488         }
 489
 490 static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 491                                                         ASN1_PCTX *ctx)
 492         {
 493         return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
 494         }
 495
 496 static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 497                                                         ASN1_PCTX *ctx)
 498         {
 499         return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
 500         }
 501
 502
 503 static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 504                                                         ASN1_PCTX *ctx)
 505         {
 506         return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
 507         }
 508
 509 static int old_dsa_priv_decode(EVP_PKEY *pkey,
 510                                         const unsigned char **pder, int derlen)
 511         {
 512         DSA *dsa;
 513         if (!(dsa = d2i_DSAPrivateKey (NULL, pder, derlen)))
 514                 {
 515                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_DSA_LIB);
 516                 return 0;
 517                 }
 518         EVP_PKEY_assign_DSA(pkey, dsa);
 519         return 1;
 520         }
 521
 522 static int old_dsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
 523         {
 524         return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
 525         }
 526
 527 /* NB these are sorted in pkey_id order, lowest first */
 528
 529 const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] =
 530         {
 531
 532                 {
 533                 EVP_PKEY_DSA2,
 534                 EVP_PKEY_DSA,
 535                 ASN1_PKEY_ALIAS
 536                 },
 537
 538                 {
 539                 EVP_PKEY_DSA1,
 540                 EVP_PKEY_DSA,
 541                 ASN1_PKEY_ALIAS
 542                 },
 543
 544                 {
 545                 EVP_PKEY_DSA4,
 546                 EVP_PKEY_DSA,
 547                 ASN1_PKEY_ALIAS
 548                 },
 549
 550                 {
 551                 EVP_PKEY_DSA3,
 552                 EVP_PKEY_DSA,
 553                 ASN1_PKEY_ALIAS
 554                 },
 555
 556                 {
 557                 EVP_PKEY_DSA,
 558                 EVP_PKEY_DSA,
 559                 0,
 560
 561                 "DSA",
 562                 "OpenSSL DSA method",
 563
 564                 dsa_pub_decode,
 565                 dsa_pub_encode,
 566                 dsa_pub_cmp,
 567                 dsa_pub_print,
 568
 569                 dsa_priv_decode,
 570                 dsa_priv_encode,
 571                 dsa_priv_print,
 572
 573                 int_dsa_size,
 574                 dsa_bits,
 575
 576                 dsa_param_decode,
 577                 dsa_param_encode,
 578                 dsa_missing_parameters,
 579                 dsa_copy_parameters,
 580                 dsa_cmp_parameters,
 581                 dsa_param_print,
 582
 583                 int_dsa_free,
 584                 0,
 585                 old_dsa_priv_decode,
 586                 old_dsa_priv_encode
 587                 }
 588         };
 589