crypto/dsa/dsa_pmeth.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/asn1t.h>
  61 #include <openssl/x509.h>
  62 #include <openssl/rsa.h>
  63 #include <openssl/evp.h>
  64 #include "evp_locl.h"
  65
  66 /* DSA pkey context structure */
  67
  68 typedef struct
  69         {
  70         /* Parameter gen parameters */
  71         int nbits;
  72         /* Keygen callback info */
  73         int gentmp[2];
  74         /* message digest */
  75         const EVP_MD *md;
  76         } DSA_PKEY_CTX;
  77
  78 static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
  79         {
  80         DSA_PKEY_CTX *dctx;
  81         dctx = OPENSSL_malloc(sizeof(DSA_PKEY_CTX));
  82         if (!dctx)
  83                 return 0;
  84         dctx->nbits = 1024;
  85         dctx->md = NULL;
  86
  87         ctx->data = dctx;
  88         ctx->keygen_info = dctx->gentmp;
  89         ctx->keygen_info_count = 2;
  90
  91         return 1;
  92         }
  93
  94 static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
  95         {
  96         DSA_PKEY_CTX *dctx = ctx->data;
  97         if (dctx)
  98                 OPENSSL_free(dctx);
  99         }
 100
 101 static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
 102                                         const unsigned char *tbs, size_t tbslen)
 103         {
 104         int ret, type;
 105         unsigned int sltmp;
 106         DSA_PKEY_CTX *dctx = ctx->data;
 107         DSA *dsa = ctx->pkey->pkey.dsa;
 108
 109         if (dctx->md)
 110                 type = EVP_MD_type(dctx->md);
 111         else
 112                 type = NID_sha1;
 113
 114         ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa);
 115
 116         if (ret < 0)
 117                 return ret;
 118         *siglen = sltmp;
 119         return 1;
 120         }
 121
 122 static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
 123                                         const unsigned char *sig, size_t siglen,
 124                                         const unsigned char *tbs, size_t tbslen)
 125         {
 126         int ret, type;
 127         DSA_PKEY_CTX *dctx = ctx->data;
 128         DSA *dsa = ctx->pkey->pkey.dsa;
 129
 130         if (dctx->md)
 131                 type = EVP_MD_type(dctx->md);
 132         else
 133                 type = NID_sha1;
 134
 135         ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa);
 136
 137         return ret;
 138         }
 139
 140 static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 141         {
 142         DSA_PKEY_CTX *dctx = ctx->data;
 143         switch (type)
 144                 {
 145                 case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
 146                 if (p1 < 256)
 147                         return -2;
 148                 dctx->nbits = p1;
 149                 return 1;
 150
 151                 case EVP_PKEY_CTRL_MD:
 152                 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1)
 153                         {
 154                         DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
 155                         return 0;
 156                         }
 157                 dctx->md = p2;
 158                 return 1;
 159
 160                 default:
 161                 return -2;
 162
 163                 }
 164         }
 165
 166 static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
 167                         const char *type, const char *value)
 168         {
 169         if (!strcmp(type, "dsa_paramgen_bits"))
 170                 {
 171                 int nbits;
 172                 nbits = atoi(value);
 173                 return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
 174                 }
 175         return -2;
 176         }
 177
 178 static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 179         {
 180         DSA *dsa = NULL;
 181         DSA_PKEY_CTX *dctx = ctx->data;
 182         BN_GENCB *pcb, cb;
 183         int ret;
 184         if (ctx->pkey_gencb)
 185                 {
 186                 pcb = &cb;
 187                 evp_pkey_set_cb_translate(pcb, ctx);
 188                 }
 189         else
 190                 pcb = NULL;
 191         dsa = DSA_new();
 192         if (!dsa)
 193                 return 0;
 194         ret = DSA_generate_parameters_ex(dsa, dctx->nbits, NULL, 0, NULL, NULL,
 195                                                                         pcb);
 196         if (ret)
 197                 EVP_PKEY_assign_DSA(pkey, dsa);
 198         else
 199                 DSA_free(dsa);
 200         return ret;
 201         }
 202
 203 static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 204         {
 205         DSA *dsa = NULL;
 206         if (ctx->pkey == NULL)
 207                 {
 208                 DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
 209                 return 0;
 210                 }
 211         dsa = DSA_new();
 212         if (!dsa)
 213                 return 0;
 214         EVP_PKEY_assign_DSA(pkey, dsa);
 215         /* Note: if error return, pkey is freed by parent routine */
 216         if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
 217                 return 0;
 218         return DSA_generate_key(pkey->pkey.dsa);
 219         }
 220
 221 const EVP_PKEY_METHOD dsa_pkey_meth =
 222         {
 223         EVP_PKEY_DSA,
 224         EVP_PKEY_FLAG_AUTOARGLEN,
 225         pkey_dsa_init,
 226         pkey_dsa_cleanup,
 227
 228         0,
 229         pkey_dsa_paramgen,
 230
 231         0,
 232         pkey_dsa_keygen,
 233
 234         0,
 235         pkey_dsa_sign,
 236
 237         0,
 238         pkey_dsa_verify,
 239
 240         0,0,
 241
 242         0,0,0,0,
 243
 244         0,0,
 245
 246         0,0,
 247
 248         0,0,
 249
 250         pkey_dsa_ctrl,
 251         pkey_dsa_ctrl_str
 252
 253
 254         };