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
  64 static int dsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
  65         {
  66         const unsigned char *p, *pm;
  67         int pklen, pmlen;
  68         int ptype;
  69         void *pval;
  70         ASN1_STRING *pstr;
  71         X509_ALGOR *palg;
  72         ASN1_INTEGER *public_key = NULL;
  73
  74         DSA *dsa = NULL;
  75
  76         if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
  77                 return 0;
  78         X509_ALGOR_get0(NULL, &ptype, &pval, palg);
  79
  80         if (ptype != V_ASN1_SEQUENCE)
  81                 {
  82                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_PARAMETER_ENCODING_ERROR);
  83                 goto err;
  84                 }
  85
  86         pstr = pval;
  87         pm = pstr->data;
  88         pmlen = pstr->length;
  89
  90         if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
  91                 {
  92                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
  93                 goto err;
  94                 }
  95
  96         if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen)))
  97                 {
  98                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
  99                 goto err;
 100                 }
 101
 102         /* We have parameters now set public key */
 103         if (!(dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
 104                 {
 105                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_BN_DECODE_ERROR);
 106                 goto err;
 107                 }
 108
 109         ASN1_INTEGER_free(public_key);
 110
 111         return 1;
 112
 113         err:
 114         if (pubkey)
 115                 ASN1_INTEGER_free(public_key);
 116         if (dsa)
 117                 DSA_free(dsa);
 118         return 0;
 119
 120         }
 121
 122 static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
 123         {
 124         DSA *dsa;
 125         void *pval;
 126         int ptype;
 127         unsigned char *penc = NULL;
 128         int penclen;
 129
 130         dsa=pkey->pkey.dsa;
 131         if (pkey->save_parameters)
 132                 {
 133                 ASN1_STRING *str;
 134                 str = ASN1_STRING_new();
 135                 str->length = i2d_DSAparams(dsa, &str->data);
 136                 if (str->length <= 0)
 137                         {
 138                         DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 139                         goto err;
 140                         }
 141                 ptype = V_ASN1_SEQUENCE;
 142                 }
 143         else
 144                 {
 145                 ptype = V_ASN1_UNDEF;
 146                 pval = NULL;
 147                 }
 148         dsa->write_params=0;
 149
 150         penclen = i2d_DSAPublicKey(dsa, &penc);
 151
 152         if (penclen <= 0)
 153                 {
 154                 DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 155                 goto err;
 156                 }
 157
 158         if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
 159                                 ptype, pval, penc, penclen))
 160                 return 1;
 161
 162         err:
 163         if (penc)
 164                 OPENSSL_free(penc);
 165         if (pval)
 166                 ASN1_STRING_free(pval);
 167
 168         return 0;
 169         }
 170
 171 static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 172         {
 173         if (BN_cmp(b->pkey.dsa->pub_key,a->pkey.dsa->pub_key) != 0)
 174                 return 0;
 175         else
 176                 return 1;
 177         }
 178
 179 /* In PKCS#8 DSA: you just get a private key integer and parameters in the
 180  * AlgorithmIdentifier the pubkey must be recalculated.
 181  */
 182
 183 static int dsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
 184         {
 185         const unsigned char *p, *pm;
 186         int pklen, pmlen;
 187         int ptype;
 188         void *pval;
 189         ASN1_STRING *pstr;
 190         X509_ALGOR *palg;
 191         ASN1_INTEGER *privkey = NULL;
 192         BN_CTX *ctx = NULL;
 193
 194         STACK_OF(ASN1_TYPE) *ndsa = NULL;
 195         DSA *dsa = NULL;
 196
 197         if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
 198                 return 0;
 199         X509_ALGOR_get0(NULL, &ptype, &pval, palg);
 200
 201         /* Check for broken DSA PKCS#8, UGH! */
 202         if (*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
 203                 {
 204                 ASN1_TYPE *t1, *t2;
 205                 if(!(ndsa = ASN1_seq_unpack_ASN1_TYPE(p, pklen,
 206                                                           d2i_ASN1_TYPE,
 207                                                           ASN1_TYPE_free)))
 208                         goto decerr;
 209                 if (sk_ASN1_TYPE_num(ndsa) != 2)
 210                         goto decerr;
 211                 /* Handle Two broken types:
 212                  * SEQUENCE {parameters, priv_key}
 213                  * SEQUENCE {pub_key, priv_key}
 214                  */
 215
 216                 t1 = sk_ASN1_TYPE_value(ndsa, 0);
 217                 t2 = sk_ASN1_TYPE_value(ndsa, 1);
 218                 if (t1->type == V_ASN1_SEQUENCE)
 219                         {
 220                         p8->broken = PKCS8_EMBEDDED_PARAM;
 221                         pval = t1->value.ptr;
 222                         }
 223                 else if (ptype == V_ASN1_SEQUENCE)
 224                         p8->broken = PKCS8_NS_DB;
 225                 else
 226                         goto decerr;
 227
 228                 if (t2->type != V_ASN1_INTEGER)
 229                         goto decerr;
 230
 231                 privkey = t2->value.integer;
 232                 }
 233         else
 234                 {
 235                 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
 236                         goto decerr;
 237                 if (ptype != V_ASN1_SEQUENCE)
 238                         goto decerr;
 239                 }
 240
 241         pstr = pval;
 242         pm = pstr->data;
 243         pmlen = pstr->length;
 244         if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
 245                 goto decerr;
 246         /* We have parameters now set private key */
 247         if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
 248                 {
 249                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
 250                 goto dsaerr;
 251                 }
 252         /* Calculate public key */
 253         if (!(dsa->pub_key = BN_new()))
 254                 {
 255                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 256                 goto dsaerr;
 257                 }
 258         if (!(ctx = BN_CTX_new()))
 259                 {
 260                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 261                 goto dsaerr;
 262                 }
 263
 264         if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx))
 265                 {
 266                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
 267                 goto dsaerr;
 268                 }
 269
 270         EVP_PKEY_assign_DSA(pkey, dsa);
 271         BN_CTX_free (ctx);
 272         if(ndsa)
 273                 sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 274         else
 275                 ASN1_INTEGER_free(privkey);
 276
 277         return 1;
 278
 279         decerr:
 280         DSAerr(DSA_F_DSA_PRIV_DECODE, EVP_R_DECODE_ERROR);
 281         dsaerr:
 282         BN_CTX_free (ctx);
 283         sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 284         DSA_free(dsa);
 285         EVP_PKEY_free(pkey);
 286         return 0;
 287         }
 288
 289 static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
 290 {
 291         ASN1_STRING *params = NULL;
 292         ASN1_INTEGER *prkey = NULL;
 293         unsigned char *dp = NULL;
 294         int dplen;
 295
 296         params = ASN1_STRING_new();
 297
 298         if (!params)
 299                 {
 300                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 301                 goto err;
 302                 }
 303
 304         params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
 305         if (params->length <= 0)
 306                 {
 307                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 308                 goto err;
 309                 }
 310         params->type = V_ASN1_SEQUENCE;
 311
 312         /* Get private key into integer */
 313         prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
 314
 315         if (!prkey)
 316                 {
 317                 DSAerr(DSA_F_DSA_PRIV_ENCODE,DSA_R_BN_ERROR);
 318                 goto err;
 319                 }
 320
 321         dplen = i2d_ASN1_INTEGER(prkey, &dp);
 322
 323         ASN1_INTEGER_free(prkey);
 324
 325         if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
 326                                 V_ASN1_SEQUENCE, params, dp, dplen))
 327                 goto err;
 328
 329         return 1;
 330
 331 err:
 332         if (dp != NULL)
 333                 OPENSSL_free(dp);
 334         if (params != NULL)
 335                 ASN1_STRING_free(params);
 336         if (prkey != NULL)
 337                 ASN1_INTEGER_free(prkey);
 338         return 0;
 339 }
 340
 341 static int int_dsa_size(const EVP_PKEY *pkey)
 342         {
 343         return(DSA_size(pkey->pkey.dsa));
 344         }
 345
 346 static int dsa_bits(const EVP_PKEY *pkey)
 347         {
 348         return BN_num_bits(pkey->pkey.dsa->p);
 349         }
 350
 351 static int dsa_missing_parameters(const EVP_PKEY *pkey)
 352         {
 353         DSA *dsa;
 354         dsa=pkey->pkey.dsa;
 355         if ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))
 356                         return 1;
 357         return 0;
 358         }
 359
 360 static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
 361         {
 362         BIGNUM *a;
 363
 364         if ((a=BN_dup(from->pkey.dsa->p)) == NULL)
 365                 return 0;
 366         if (to->pkey.dsa->p != NULL)
 367                 BN_free(to->pkey.dsa->p);
 368         to->pkey.dsa->p=a;
 369
 370         if ((a=BN_dup(from->pkey.dsa->q)) == NULL)
 371                 return 0;
 372         if (to->pkey.dsa->q != NULL)
 373                 BN_free(to->pkey.dsa->q);
 374         to->pkey.dsa->q=a;
 375
 376         if ((a=BN_dup(from->pkey.dsa->g)) == NULL)
 377                 return 0;
 378         if (to->pkey.dsa->g != NULL)
 379                 BN_free(to->pkey.dsa->g);
 380         to->pkey.dsa->g=a;
 381         return 1;
 382         }
 383
 384 static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
 385         {
 386         if (    BN_cmp(a->pkey.dsa->p,b->pkey.dsa->p) ||
 387                 BN_cmp(a->pkey.dsa->q,b->pkey.dsa->q) ||
 388                 BN_cmp(a->pkey.dsa->g,b->pkey.dsa->g))
 389                 return 0;
 390         else
 391                 return 1;
 392         }
 393
 394 static void int_dsa_free(EVP_PKEY *pkey)
 395         {
 396         DSA_free(pkey->pkey.dsa);
 397         }
 398
 399 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
 400         {
 401         int i;
 402         if (!b)
 403                 return;
 404         if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
 405                         *pbuflen = i;
 406         }
 407
 408 int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
 409         {
 410         unsigned char *m=NULL;
 411         int ret=0;
 412         size_t buf_len=0;
 413         const char *ktype = NULL;
 414
 415         const BIGNUM *priv_key, *pub_key;
 416
 417         if (ptype == 2)
 418                 priv_key = x->priv_key;
 419         else
 420                 priv_key = NULL;
 421
 422         if (ptype > 0)
 423                 pub_key = x->pub_key;
 424         else
 425                 pub_key = NULL;
 426
 427         if (ptype == 2)
 428                 ktype = "Private-Key";
 429         else if (ptype == 1)
 430                 ktype = "Public-Key";
 431         else
 432                 ktype = "DSA-Parameters";
 433
 434         if (x->p == NULL)
 435                 {
 436                 DSAerr(DSA_F_DSA_PRINT,DSA_R_MISSING_PARAMETERS);
 437                 goto err;
 438                 }
 439
 440         update_buflen(x->p, &buf_len);
 441         update_buflen(x->q, &buf_len);
 442         update_buflen(x->g, &buf_len);
 443         update_buflen(priv_key, &buf_len);
 444         update_buflen(pub_key, &buf_len);
 445
 446         m=(unsigned char *)OPENSSL_malloc(buf_len+10);
 447         if (m == NULL)
 448                 {
 449                 DSAerr(DSA_F_DSA_PRINT,ERR_R_MALLOC_FAILURE);
 450                 goto err;
 451                 }
 452
 453         if (priv_key)
 454                 {
 455                 if(!BIO_indent(bp,off,128))
 456                    goto err;
 457                 if (BIO_printf(bp,"%s: (%d bit)\n",ktype, BN_num_bits(x->p))
 458                         <= 0) goto err;
 459                 }
 460
 461         if (!ASN1_bn_print(bp,"priv:",priv_key,m,off))
 462                 goto err;
 463         if (!ASN1_bn_print(bp,"pub: ",pub_key,m,off))
 464                 goto err;
 465         if (!ASN1_bn_print(bp,"P:   ",x->p,m,off)) goto err;
 466         if (!ASN1_bn_print(bp,"Q:   ",x->q,m,off)) goto err;
 467         if (!ASN1_bn_print(bp,"G:   ",x->g,m,off)) goto err;
 468         ret=1;
 469 err:
 470         if (m != NULL) OPENSSL_free(m);
 471         return(ret);
 472         }
 473
 474
 475 static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 476                                                         ASN1_PCTX *ctx)
 477         {
 478         return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
 479         }
 480
 481 static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 482                                                         ASN1_PCTX *ctx)
 483         {
 484         return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
 485         }
 486
 487
 488 static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 489                                                         ASN1_PCTX *ctx)
 490         {
 491         return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
 492         }
 493
 494 /* NB these are sorted in pkey_id order, lowest first */
 495
 496 const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] =
 497         {
 498
 499                 {
 500                 EVP_PKEY_DSA2,
 501                 EVP_PKEY_DSA,
 502                 ASN1_PKEY_ALIAS
 503                 },
 504
 505                 {
 506                 EVP_PKEY_DSA1,
 507                 EVP_PKEY_DSA,
 508                 ASN1_PKEY_ALIAS
 509                 },
 510
 511                 {
 512                 EVP_PKEY_DSA4,
 513                 EVP_PKEY_DSA,
 514                 ASN1_PKEY_ALIAS
 515                 },
 516
 517                 {
 518                 EVP_PKEY_DSA3,
 519                 EVP_PKEY_DSA,
 520                 ASN1_PKEY_ALIAS
 521                 },
 522
 523                 {
 524                 EVP_PKEY_DSA,
 525                 EVP_PKEY_DSA,
 526                 0,
 527
 528                 dsa_pub_decode,
 529                 dsa_pub_encode,
 530                 dsa_pub_cmp,
 531                 dsa_pub_print,
 532
 533                 dsa_priv_decode,
 534                 dsa_priv_encode,
 535                 dsa_priv_print,
 536
 537                 int_dsa_size,
 538                 dsa_bits,
 539
 540                 0,0,
 541                 dsa_missing_parameters,
 542                 dsa_copy_parameters,
 543                 dsa_cmp_parameters,
 544                 dsa_param_print,
 545
 546                 int_dsa_free,
 547                 0
 548                 }
 549         };
 550