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, 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 /* In PKCS#8 DSA: you just get a private key integer and parameters in the
 172  * AlgorithmIdentifier the pubkey must be recalculated.
 173  */
 174
 175 static int dsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
 176         {
 177         const unsigned char *p, *pm;
 178         int pklen, pmlen;
 179         int ptype;
 180         void *pval;
 181         ASN1_STRING *pstr;
 182         X509_ALGOR *palg;
 183         ASN1_INTEGER *privkey = NULL;
 184         BN_CTX *ctx = NULL;
 185
 186         STACK_OF(ASN1_TYPE) *ndsa = NULL;
 187         DSA *dsa = NULL;
 188
 189         if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
 190                 return 0;
 191         X509_ALGOR_get0(NULL, &ptype, &pval, palg);
 192
 193         /* Check for broken DSA PKCS#8, UGH! */
 194         if (*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
 195                 {
 196                 ASN1_TYPE *t1, *t2;
 197                 if(!(ndsa = ASN1_seq_unpack_ASN1_TYPE(p, pklen,
 198                                                           d2i_ASN1_TYPE,
 199                                                           ASN1_TYPE_free)))
 200                         goto decerr;
 201                 if (sk_ASN1_TYPE_num(ndsa) != 2)
 202                         goto decerr;
 203                 /* Handle Two broken types:
 204                  * SEQUENCE {parameters, priv_key}
 205                  * SEQUENCE {pub_key, priv_key}
 206                  */
 207
 208                 t1 = sk_ASN1_TYPE_value(ndsa, 0);
 209                 t2 = sk_ASN1_TYPE_value(ndsa, 1);
 210                 if (t1->type == V_ASN1_SEQUENCE)
 211                         {
 212                         p8->broken = PKCS8_EMBEDDED_PARAM;
 213                         pval = t1->value.ptr;
 214                         }
 215                 else if (ptype == V_ASN1_SEQUENCE)
 216                         p8->broken = PKCS8_NS_DB;
 217                 else
 218                         goto decerr;
 219
 220                 if (t2->type != V_ASN1_INTEGER)
 221                         goto decerr;
 222
 223                 privkey = t2->value.integer;
 224                 }
 225         else
 226                 {
 227                 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
 228                         goto decerr;
 229                 if (ptype != V_ASN1_SEQUENCE)
 230                         goto decerr;
 231                 }
 232
 233         pstr = pval;
 234         pm = pstr->data;
 235         pmlen = pstr->length;
 236         if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
 237                 goto decerr;
 238         /* We have parameters now set private key */
 239         if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
 240                 {
 241                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
 242                 goto dsaerr;
 243                 }
 244         /* Calculate public key */
 245         if (!(dsa->pub_key = BN_new()))
 246                 {
 247                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 248                 goto dsaerr;
 249                 }
 250         if (!(ctx = BN_CTX_new()))
 251                 {
 252                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 253                 goto dsaerr;
 254                 }
 255
 256         if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx))
 257                 {
 258                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
 259                 goto dsaerr;
 260                 }
 261
 262         EVP_PKEY_assign_DSA(pkey, dsa);
 263         BN_CTX_free (ctx);
 264         if(ndsa)
 265                 sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 266         else
 267                 ASN1_INTEGER_free(privkey);
 268
 269         return 1;
 270
 271         decerr:
 272         DSAerr(DSA_F_DSA_PRIV_DECODE, EVP_R_DECODE_ERROR);
 273         dsaerr:
 274         BN_CTX_free (ctx);
 275         sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 276         DSA_free(dsa);
 277         EVP_PKEY_free(pkey);
 278         return 0;
 279         }
 280
 281 static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, EVP_PKEY *pkey)
 282 {
 283         ASN1_STRING *params = NULL;
 284         ASN1_INTEGER *prkey = NULL;
 285         unsigned char *dp = NULL;
 286         int dplen;
 287
 288         params = ASN1_STRING_new();
 289
 290         if (!params)
 291                 {
 292                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 293                 goto err;
 294                 }
 295
 296         params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
 297         if (params->length <= 0)
 298                 {
 299                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 300                 goto err;
 301                 }
 302         params->type = V_ASN1_SEQUENCE;
 303
 304         /* Get private key into integer */
 305         prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
 306
 307         if (!prkey)
 308                 {
 309                 DSAerr(DSA_F_DSA_PRIV_ENCODE,DSA_R_BN_ERROR);
 310                 goto err;
 311                 }
 312
 313         dplen = i2d_ASN1_INTEGER(prkey, &dp);
 314
 315         ASN1_INTEGER_free(prkey);
 316
 317         if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
 318                                 V_ASN1_SEQUENCE, params, dp, dplen))
 319                 goto err;
 320
 321         return 1;
 322
 323 err:
 324         if (dp != NULL)
 325                 OPENSSL_free(dp);
 326         if (params != NULL)
 327                 ASN1_STRING_free(params);
 328         if (prkey != NULL)
 329                 ASN1_INTEGER_free(prkey);
 330         return 0;
 331 }
 332
 333 /* NB these are sorted in pkey_id order, lowest first */
 334
 335 const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] =
 336         {
 337
 338                 {
 339                 EVP_PKEY_DSA2,
 340                 EVP_PKEY_DSA,
 341                 ASN1_PKEY_ALIAS
 342                 },
 343
 344                 {
 345                 EVP_PKEY_DSA1,
 346                 EVP_PKEY_DSA,
 347                 ASN1_PKEY_ALIAS
 348                 },
 349
 350                 {
 351                 EVP_PKEY_DSA4,
 352                 EVP_PKEY_DSA,
 353                 ASN1_PKEY_ALIAS
 354                 },
 355
 356                 {
 357                 EVP_PKEY_DSA3,
 358                 EVP_PKEY_DSA,
 359                 ASN1_PKEY_ALIAS
 360                 },
 361
 362                 {
 363                 EVP_PKEY_DSA,
 364                 EVP_PKEY_DSA,
 365                 0,
 366                 dsa_pub_decode,
 367                 dsa_pub_encode,
 368                 0,
 369                 dsa_priv_decode,
 370                 dsa_priv_encode,
 371                 0,
 372                 0,
 373                 0
 374                 }
 375         };
 376