crypto/dsa/dsa_pmeth.c

   1 /*
   2  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   3  * 2006.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include "internal/cryptlib.h"
  61 #include <openssl/asn1t.h>
  62 #include <openssl/x509.h>
  63 #include <openssl/evp.h>
  64 #include <openssl/bn.h>
  65 #include "internal/evp_int.h"
  66 #include "dsa_locl.h"
  67
  68 /* DSA pkey context structure */
  69
  70 typedef struct {
  71     /* Parameter gen parameters */
  72     int nbits;                  /* size of p in bits (default: 1024) */
  73     int qbits;                  /* size of q in bits (default: 160) */
  74     const EVP_MD *pmd;          /* MD for parameter generation */
  75     /* Keygen callback info */
  76     int gentmp[2];
  77     /* message digest */
  78     const EVP_MD *md;           /* MD for the signature */
  79 } DSA_PKEY_CTX;
  80
  81 static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
  82 {
  83     DSA_PKEY_CTX *dctx;
  84     dctx = OPENSSL_malloc(sizeof(*dctx));
  85     if (dctx == NULL)
  86         return 0;
  87     dctx->nbits = 1024;
  88     dctx->qbits = 160;
  89     dctx->pmd = NULL;
  90     dctx->md = NULL;
  91
  92     ctx->data = dctx;
  93     ctx->keygen_info = dctx->gentmp;
  94     ctx->keygen_info_count = 2;
  95
  96     return 1;
  97 }
  98
  99 static int pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
 100 {
 101     DSA_PKEY_CTX *dctx, *sctx;
 102     if (!pkey_dsa_init(dst))
 103         return 0;
 104     sctx = src->data;
 105     dctx = dst->data;
 106     dctx->nbits = sctx->nbits;
 107     dctx->qbits = sctx->qbits;
 108     dctx->pmd = sctx->pmd;
 109     dctx->md = sctx->md;
 110     return 1;
 111 }
 112
 113 static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
 114 {
 115     DSA_PKEY_CTX *dctx = ctx->data;
 116     OPENSSL_free(dctx);
 117 }
 118
 119 static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
 120                          size_t *siglen, const unsigned char *tbs,
 121                          size_t tbslen)
 122 {
 123     int ret, type;
 124     unsigned int sltmp;
 125     DSA_PKEY_CTX *dctx = ctx->data;
 126     DSA *dsa = ctx->pkey->pkey.dsa;
 127
 128     if (dctx->md) {
 129         if (tbslen != (size_t)EVP_MD_size(dctx->md))
 130             return 0;
 131         type = EVP_MD_type(dctx->md);
 132     } else {
 133         if (tbslen != SHA_DIGEST_LENGTH)
 134             return 0;
 135         type = NID_sha1;
 136     }
 137
 138     ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa);
 139
 140     if (ret <= 0)
 141         return ret;
 142     *siglen = sltmp;
 143     return 1;
 144 }
 145
 146 static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
 147                            const unsigned char *sig, size_t siglen,
 148                            const unsigned char *tbs, size_t tbslen)
 149 {
 150     int ret, type;
 151     DSA_PKEY_CTX *dctx = ctx->data;
 152     DSA *dsa = ctx->pkey->pkey.dsa;
 153
 154     if (dctx->md) {
 155         if (tbslen != (size_t)EVP_MD_size(dctx->md))
 156             return 0;
 157         type = EVP_MD_type(dctx->md);
 158     } else {
 159         if (tbslen != SHA_DIGEST_LENGTH)
 160             return 0;
 161         type = NID_sha1;
 162     }
 163
 164     ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa);
 165
 166     return ret;
 167 }
 168
 169 static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 170 {
 171     DSA_PKEY_CTX *dctx = ctx->data;
 172     switch (type) {
 173     case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
 174         if (p1 < 256)
 175             return -2;
 176         dctx->nbits = p1;
 177         return 1;
 178
 179     case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
 180         if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
 181             return -2;
 182         dctx->qbits = p1;
 183         return 1;
 184
 185     case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
 186         if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
 187             EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
 188             EVP_MD_type((const EVP_MD *)p2) != NID_sha256) {
 189             DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
 190             return 0;
 191         }
 192         dctx->md = p2;
 193         return 1;
 194
 195     case EVP_PKEY_CTRL_MD:
 196         if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
 197             EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
 198             EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA &&
 199             EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
 200             EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
 201             EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
 202             EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
 203             DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
 204             return 0;
 205         }
 206         dctx->md = p2;
 207         return 1;
 208
 209     case EVP_PKEY_CTRL_GET_MD:
 210         *(const EVP_MD **)p2 = dctx->md;
 211         return 1;
 212
 213     case EVP_PKEY_CTRL_DIGESTINIT:
 214     case EVP_PKEY_CTRL_PKCS7_SIGN:
 215     case EVP_PKEY_CTRL_CMS_SIGN:
 216         return 1;
 217
 218     case EVP_PKEY_CTRL_PEER_KEY:
 219         DSAerr(DSA_F_PKEY_DSA_CTRL,
 220                EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 221         return -2;
 222     default:
 223         return -2;
 224
 225     }
 226 }
 227
 228 static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
 229                              const char *type, const char *value)
 230 {
 231     if (strcmp(type, "dsa_paramgen_bits") == 0) {
 232         int nbits;
 233         nbits = atoi(value);
 234         return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
 235     }
 236     if (strcmp(type, "dsa_paramgen_q_bits") == 0) {
 237         int qbits = atoi(value);
 238         return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
 239                                  EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits,
 240                                  NULL);
 241     }
 242     if (strcmp(type, "dsa_paramgen_md") == 0) {
 243         return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
 244                                  EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
 245                                  (void *)EVP_get_digestbyname(value));
 246     }
 247     return -2;
 248 }
 249
 250 static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 251 {
 252     DSA *dsa = NULL;
 253     DSA_PKEY_CTX *dctx = ctx->data;
 254     BN_GENCB *pcb;
 255     int ret;
 256     if (ctx->pkey_gencb) {
 257         pcb = BN_GENCB_new();
 258         if (pcb == NULL)
 259             return 0;
 260         evp_pkey_set_cb_translate(pcb, ctx);
 261     } else
 262         pcb = NULL;
 263     dsa = DSA_new();
 264     if (dsa == NULL) {
 265         BN_GENCB_free(pcb);
 266         return 0;
 267     }
 268     ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
 269                                NULL, 0, NULL, NULL, NULL, pcb);
 270     BN_GENCB_free(pcb);
 271     if (ret)
 272         EVP_PKEY_assign_DSA(pkey, dsa);
 273     else
 274         DSA_free(dsa);
 275     return ret;
 276 }
 277
 278 static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 279 {
 280     DSA *dsa = NULL;
 281     if (ctx->pkey == NULL) {
 282         DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
 283         return 0;
 284     }
 285     dsa = DSA_new();
 286     if (dsa == NULL)
 287         return 0;
 288     EVP_PKEY_assign_DSA(pkey, dsa);
 289     /* Note: if error return, pkey is freed by parent routine */
 290     if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
 291         return 0;
 292     return DSA_generate_key(pkey->pkey.dsa);
 293 }
 294
 295 const EVP_PKEY_METHOD dsa_pkey_meth = {
 296     EVP_PKEY_DSA,
 297     EVP_PKEY_FLAG_AUTOARGLEN,
 298     pkey_dsa_init,
 299     pkey_dsa_copy,
 300     pkey_dsa_cleanup,
 301
 302     0,
 303     pkey_dsa_paramgen,
 304
 305     0,
 306     pkey_dsa_keygen,
 307
 308     0,
 309     pkey_dsa_sign,
 310
 311     0,
 312     pkey_dsa_verify,
 313
 314     0, 0,
 315
 316     0, 0, 0, 0,
 317
 318     0, 0,
 319
 320     0, 0,
 321
 322     0, 0,
 323
 324     pkey_dsa_ctrl,
 325     pkey_dsa_ctrl_str
 326 };