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;
 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                 {
 147                 ptype = V_ASN1_UNDEF;
 148                 pval = NULL;
 149                 }
 150         dsa->write_params=0;
 151
 152         penclen = i2d_DSAPublicKey(dsa, &penc);
 153
 154         if (penclen <= 0)
 155                 {
 156                 DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 157                 goto err;
 158                 }
 159
 160         if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
 161                                 ptype, pval, penc, penclen))
 162                 return 1;
 163
 164         err:
 165         if (penc)
 166                 OPENSSL_free(penc);
 167         if (pval)
 168                 ASN1_STRING_free(pval);
 169
 170         return 0;
 171         }
 172
 173 static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 174         {
 175         if (BN_cmp(b->pkey.dsa->pub_key,a->pkey.dsa->pub_key) != 0)
 176                 return 0;
 177         else
 178                 return 1;
 179         }
 180
 181 /* In PKCS#8 DSA: you just get a private key integer and parameters in the
 182  * AlgorithmIdentifier the pubkey must be recalculated.
 183  */
 184
 185 static int dsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
 186         {
 187         const unsigned char *p, *pm;
 188         int pklen, pmlen;
 189         int ptype;
 190         void *pval;
 191         ASN1_STRING *pstr;
 192         X509_ALGOR *palg;
 193         ASN1_INTEGER *privkey = NULL;
 194         BN_CTX *ctx = NULL;
 195
 196         STACK_OF(ASN1_TYPE) *ndsa = NULL;
 197         DSA *dsa = NULL;
 198
 199         if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
 200                 return 0;
 201         X509_ALGOR_get0(NULL, &ptype, &pval, palg);
 202
 203         /* Check for broken DSA PKCS#8, UGH! */
 204         if (*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
 205                 {
 206                 ASN1_TYPE *t1, *t2;
 207                 if(!(ndsa = ASN1_seq_unpack_ASN1_TYPE(p, pklen,
 208                                                           d2i_ASN1_TYPE,
 209                                                           ASN1_TYPE_free)))
 210                         goto decerr;
 211                 if (sk_ASN1_TYPE_num(ndsa) != 2)
 212                         goto decerr;
 213                 /* Handle Two broken types:
 214                  * SEQUENCE {parameters, priv_key}
 215                  * SEQUENCE {pub_key, priv_key}
 216                  */
 217
 218                 t1 = sk_ASN1_TYPE_value(ndsa, 0);
 219                 t2 = sk_ASN1_TYPE_value(ndsa, 1);
 220                 if (t1->type == V_ASN1_SEQUENCE)
 221                         {
 222                         p8->broken = PKCS8_EMBEDDED_PARAM;
 223                         pval = t1->value.ptr;
 224                         }
 225                 else if (ptype == V_ASN1_SEQUENCE)
 226                         p8->broken = PKCS8_NS_DB;
 227                 else
 228                         goto decerr;
 229
 230                 if (t2->type != V_ASN1_INTEGER)
 231                         goto decerr;
 232
 233                 privkey = t2->value.integer;
 234                 }
 235         else
 236                 {
 237                 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
 238                         goto decerr;
 239                 if (ptype != V_ASN1_SEQUENCE)
 240                         goto decerr;
 241                 }
 242
 243         pstr = pval;
 244         pm = pstr->data;
 245         pmlen = pstr->length;
 246         if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
 247                 goto decerr;
 248         /* We have parameters now set private key */
 249         if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
 250                 {
 251                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
 252                 goto dsaerr;
 253                 }
 254         /* Calculate public key */
 255         if (!(dsa->pub_key = BN_new()))
 256                 {
 257                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 258                 goto dsaerr;
 259                 }
 260         if (!(ctx = BN_CTX_new()))
 261                 {
 262                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 263                 goto dsaerr;
 264                 }
 265
 266         if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx))
 267                 {
 268                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
 269                 goto dsaerr;
 270                 }
 271
 272         EVP_PKEY_assign_DSA(pkey, dsa);
 273         BN_CTX_free (ctx);
 274         if(ndsa)
 275                 sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 276         else
 277                 ASN1_INTEGER_free(privkey);
 278
 279         return 1;
 280
 281         decerr:
 282         DSAerr(DSA_F_DSA_PRIV_DECODE, EVP_R_DECODE_ERROR);
 283         dsaerr:
 284         BN_CTX_free (ctx);
 285         sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 286         DSA_free(dsa);
 287         EVP_PKEY_free(pkey);
 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 void int_dsa_free(EVP_PKEY *pkey)
 397         {
 398         DSA_free(pkey->pkey.dsa);
 399         }
 400
 401 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
 402         {
 403         int i;
 404         if (!b)
 405                 return;
 406         if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
 407                         *pbuflen = i;
 408         }
 409
 410 int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
 411         {
 412         unsigned char *m=NULL;
 413         int ret=0;
 414         size_t buf_len=0;
 415         const char *ktype = NULL;
 416
 417         const BIGNUM *priv_key, *pub_key;
 418
 419         if (ptype == 2)
 420                 priv_key = x->priv_key;
 421         else
 422                 priv_key = NULL;
 423
 424         if (ptype > 0)
 425                 pub_key = x->pub_key;
 426         else
 427                 pub_key = NULL;
 428
 429         if (ptype == 2)
 430                 ktype = "Private-Key";
 431         else if (ptype == 1)
 432                 ktype = "Public-Key";
 433         else
 434                 ktype = "DSA-Parameters";
 435
 436         if (x->p == NULL)
 437                 {
 438                 DSAerr(DSA_F_DSA_PRINT,DSA_R_MISSING_PARAMETERS);
 439                 goto err;
 440                 }
 441
 442         update_buflen(x->p, &buf_len);
 443         update_buflen(x->q, &buf_len);
 444         update_buflen(x->g, &buf_len);
 445         update_buflen(priv_key, &buf_len);
 446         update_buflen(pub_key, &buf_len);
 447
 448         m=(unsigned char *)OPENSSL_malloc(buf_len+10);
 449         if (m == NULL)
 450                 {
 451                 DSAerr(DSA_F_DSA_PRINT,ERR_R_MALLOC_FAILURE);
 452                 goto err;
 453                 }
 454
 455         if (priv_key)
 456                 {
 457                 if(!BIO_indent(bp,off,128))
 458                    goto err;
 459                 if (BIO_printf(bp,"%s: (%d bit)\n",ktype, BN_num_bits(x->p))
 460                         <= 0) goto err;
 461                 }
 462
 463         if (!ASN1_bn_print(bp,"priv:",priv_key,m,off))
 464                 goto err;
 465         if (!ASN1_bn_print(bp,"pub: ",pub_key,m,off))
 466                 goto err;
 467         if (!ASN1_bn_print(bp,"P:   ",x->p,m,off)) goto err;
 468         if (!ASN1_bn_print(bp,"Q:   ",x->q,m,off)) goto err;
 469         if (!ASN1_bn_print(bp,"G:   ",x->g,m,off)) goto err;
 470         ret=1;
 471 err:
 472         if (m != NULL) OPENSSL_free(m);
 473         return(ret);
 474         }
 475
 476
 477 static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 478                                                         ASN1_PCTX *ctx)
 479         {
 480         return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
 481         }
 482
 483 static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 484                                                         ASN1_PCTX *ctx)
 485         {
 486         return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
 487         }
 488
 489
 490 static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 491                                                         ASN1_PCTX *ctx)
 492         {
 493         return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
 494         }
 495
 496 /* NB these are sorted in pkey_id order, lowest first */
 497
 498 const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] =
 499         {
 500
 501                 {
 502                 EVP_PKEY_DSA2,
 503                 EVP_PKEY_DSA,
 504                 ASN1_PKEY_ALIAS
 505                 },
 506
 507                 {
 508                 EVP_PKEY_DSA1,
 509                 EVP_PKEY_DSA,
 510                 ASN1_PKEY_ALIAS
 511                 },
 512
 513                 {
 514                 EVP_PKEY_DSA4,
 515                 EVP_PKEY_DSA,
 516                 ASN1_PKEY_ALIAS
 517                 },
 518
 519                 {
 520                 EVP_PKEY_DSA3,
 521                 EVP_PKEY_DSA,
 522                 ASN1_PKEY_ALIAS
 523                 },
 524
 525                 {
 526                 EVP_PKEY_DSA,
 527                 EVP_PKEY_DSA,
 528                 0,
 529
 530                 "dsa",
 531                 "OpenSSL DSA method",
 532
 533                 dsa_pub_decode,
 534                 dsa_pub_encode,
 535                 dsa_pub_cmp,
 536                 dsa_pub_print,
 537
 538                 dsa_priv_decode,
 539                 dsa_priv_encode,
 540                 dsa_priv_print,
 541
 542                 int_dsa_size,
 543                 dsa_bits,
 544
 545                 0,0,
 546                 dsa_missing_parameters,
 547                 dsa_copy_parameters,
 548                 dsa_cmp_parameters,
 549                 dsa_param_print,
 550
 551                 int_dsa_free,
 552                 0
 553                 }
 554         };
 555