Cryptlib/OpenSSL/crypto/evp/m_sigver.c

   1 /* m_sigver.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 2006.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2006,2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61 #include "cryptlib.h"
  62 #include <openssl/evp.h>
  63 #include <openssl/objects.h>
  64 #include <openssl/x509.h>
  65 #include "evp_locl.h"
  66
  67 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
  68                           const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey,
  69                           int ver)
  70 {
  71     if (ctx->pctx == NULL)
  72         ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
  73     if (ctx->pctx == NULL)
  74         return 0;
  75
  76     if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
  77
  78         if (type == NULL) {
  79             int def_nid;
  80             if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
  81                 type = EVP_get_digestbynid(def_nid);
  82         }
  83
  84         if (type == NULL) {
  85             EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
  86             return 0;
  87         }
  88     }
  89
  90     if (ver) {
  91         if (ctx->pctx->pmeth->verifyctx_init) {
  92             if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
  93                 return 0;
  94             ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
  95         } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0)
  96             return 0;
  97     } else {
  98         if (ctx->pctx->pmeth->signctx_init) {
  99             if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
 100                 return 0;
 101             ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
 102         } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0)
 103             return 0;
 104     }
 105     if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
 106         return 0;
 107     if (pctx)
 108         *pctx = ctx->pctx;
 109     if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
 110         return 1;
 111     if (!EVP_DigestInit_ex(ctx, type, e))
 112         return 0;
 113     return 1;
 114 }
 115
 116 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 117                        const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 118 {
 119     return do_sigver_init(ctx, pctx, type, e, pkey, 0);
 120 }
 121
 122 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 123                          const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 124 {
 125     return do_sigver_init(ctx, pctx, type, e, pkey, 1);
 126 }
 127
 128 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
 129                         size_t *siglen)
 130 {
 131     int sctx, r = 0;
 132     EVP_PKEY_CTX *pctx = ctx->pctx;
 133     if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
 134         EVP_PKEY_CTX *dctx;
 135         if (!sigret)
 136             return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 137         dctx = EVP_PKEY_CTX_dup(ctx->pctx);
 138         if (!dctx)
 139             return 0;
 140         r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
 141         EVP_PKEY_CTX_free(dctx);
 142         return r;
 143     }
 144     if (pctx->pmeth->signctx)
 145         sctx = 1;
 146     else
 147         sctx = 0;
 148     if (sigret) {
 149         EVP_MD_CTX tmp_ctx;
 150         unsigned char md[EVP_MAX_MD_SIZE];
 151         unsigned int mdlen;
 152         EVP_MD_CTX_init(&tmp_ctx);
 153         if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx))
 154             return 0;
 155         if (sctx)
 156             r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx,
 157                                              sigret, siglen, &tmp_ctx);
 158         else
 159             r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
 160         EVP_MD_CTX_cleanup(&tmp_ctx);
 161         if (sctx || !r)
 162             return r;
 163         if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0)
 164             return 0;
 165     } else {
 166         if (sctx) {
 167             if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
 168                 return 0;
 169         } else {
 170             int s = EVP_MD_size(ctx->digest);
 171             if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
 172                 return 0;
 173         }
 174     }
 175     return 1;
 176 }
 177
 178 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
 179                           size_t siglen)
 180 {
 181     EVP_MD_CTX tmp_ctx;
 182     unsigned char md[EVP_MAX_MD_SIZE];
 183     int r;
 184     unsigned int mdlen;
 185     int vctx;
 186
 187     if (ctx->pctx->pmeth->verifyctx)
 188         vctx = 1;
 189     else
 190         vctx = 0;
 191     EVP_MD_CTX_init(&tmp_ctx);
 192     if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx))
 193         return -1;
 194     if (vctx) {
 195         r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx,
 196                                            sig, siglen, &tmp_ctx);
 197     } else
 198         r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
 199     EVP_MD_CTX_cleanup(&tmp_ctx);
 200     if (vctx || !r)
 201         return r;
 202     return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
 203 }