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 "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)
  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         type = EVP_MD_type(dctx->md);
 130     else
 131         type = NID_sha1;
 132
 133     ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa);
 134
 135     if (ret <= 0)
 136         return ret;
 137     *siglen = sltmp;
 138     return 1;
 139 }
 140
 141 static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
 142                            const unsigned char *sig, size_t siglen,
 143                            const unsigned char *tbs, size_t tbslen)
 144 {
 145     int ret, type;
 146     DSA_PKEY_CTX *dctx = ctx->data;
 147     DSA *dsa = ctx->pkey->pkey.dsa;
 148
 149     if (dctx->md)
 150         type = EVP_MD_type(dctx->md);
 151     else
 152         type = NID_sha1;
 153
 154     ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa);
 155
 156     return ret;
 157 }
 158
 159 static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 160 {
 161     DSA_PKEY_CTX *dctx = ctx->data;
 162     switch (type) {
 163     case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
 164         if (p1 < 256)
 165             return -2;
 166         dctx->nbits = p1;
 167         return 1;
 168
 169     case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
 170         if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
 171             return -2;
 172         dctx->qbits = p1;
 173         return 1;
 174
 175     case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
 176         if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
 177             EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
 178             EVP_MD_type((const EVP_MD *)p2) != NID_sha256) {
 179             DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
 180             return 0;
 181         }
 182         dctx->md = p2;
 183         return 1;
 184
 185     case EVP_PKEY_CTRL_MD:
 186         if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
 187             EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
 188             EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA &&
 189             EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
 190             EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
 191             EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
 192             EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
 193             DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
 194             return 0;
 195         }
 196         dctx->md = p2;
 197         return 1;
 198
 199     case EVP_PKEY_CTRL_GET_MD:
 200         *(const EVP_MD **)p2 = dctx->md;
 201         return 1;
 202
 203     case EVP_PKEY_CTRL_DIGESTINIT:
 204     case EVP_PKEY_CTRL_PKCS7_SIGN:
 205     case EVP_PKEY_CTRL_CMS_SIGN:
 206         return 1;
 207
 208     case EVP_PKEY_CTRL_PEER_KEY:
 209         DSAerr(DSA_F_PKEY_DSA_CTRL,
 210                EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 211         return -2;
 212     default:
 213         return -2;
 214
 215     }
 216 }
 217
 218 static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
 219                              const char *type, const char *value)
 220 {
 221     if (strcmp(type, "dsa_paramgen_bits") == 0) {
 222         int nbits;
 223         nbits = atoi(value);
 224         return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
 225     }
 226     if (strcmp(type, "dsa_paramgen_q_bits") == 0) {
 227         int qbits = atoi(value);
 228         return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
 229                                  EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits,
 230                                  NULL);
 231     }
 232     if (strcmp(type, "dsa_paramgen_md") == 0) {
 233         return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
 234                                  EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
 235                                  (void *)EVP_get_digestbyname(value));
 236     }
 237     return -2;
 238 }
 239
 240 static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 241 {
 242     DSA *dsa = NULL;
 243     DSA_PKEY_CTX *dctx = ctx->data;
 244     BN_GENCB *pcb;
 245     int ret;
 246     if (ctx->pkey_gencb) {
 247         pcb = BN_GENCB_new();
 248         if (!pcb)
 249             return 0;
 250         evp_pkey_set_cb_translate(pcb, ctx);
 251     } else
 252         pcb = NULL;
 253     dsa = DSA_new();
 254     if (!dsa) {
 255         BN_GENCB_free(pcb);
 256         return 0;
 257     }
 258     ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
 259                                NULL, 0, NULL, NULL, NULL, pcb);
 260     BN_GENCB_free(pcb);
 261     if (ret)
 262         EVP_PKEY_assign_DSA(pkey, dsa);
 263     else
 264         DSA_free(dsa);
 265     return ret;
 266 }
 267
 268 static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 269 {
 270     DSA *dsa = NULL;
 271     if (ctx->pkey == NULL) {
 272         DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
 273         return 0;
 274     }
 275     dsa = DSA_new();
 276     if (!dsa)
 277         return 0;
 278     EVP_PKEY_assign_DSA(pkey, dsa);
 279     /* Note: if error return, pkey is freed by parent routine */
 280     if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
 281         return 0;
 282     return DSA_generate_key(pkey->pkey.dsa);
 283 }
 284
 285 const EVP_PKEY_METHOD dsa_pkey_meth = {
 286     EVP_PKEY_DSA,
 287     EVP_PKEY_FLAG_AUTOARGLEN,
 288     pkey_dsa_init,
 289     pkey_dsa_copy,
 290     pkey_dsa_cleanup,
 291
 292     0,
 293     pkey_dsa_paramgen,
 294
 295     0,
 296     pkey_dsa_keygen,
 297
 298     0,
 299     pkey_dsa_sign,
 300
 301     0,
 302     pkey_dsa_verify,
 303
 304     0, 0,
 305
 306     0, 0, 0, 0,
 307
 308     0, 0,
 309
 310     0, 0,
 311
 312     0, 0,
 313
 314     pkey_dsa_ctrl,
 315     pkey_dsa_ctrl_str
 316 };