crypto/evp/m_sigver.c

   1 /* m_sigver.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project 2006.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2006,2007 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/evp.h>
  62 #include <openssl/objects.h>
  63 #include <openssl/x509.h>
  64 #include "evp_locl.h"
  65
  66 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
  67                           const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey,
  68                           int ver)
  69         {
  70         if (ctx->pctx == NULL)
  71                 ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
  72         if (ctx->pctx == NULL)
  73                 return 0;
  74         if (ver)
  75                 {
  76                 if (ctx->pctx->pmeth->verifyctx_init)
  77                         {
  78                         if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <=0)
  79                                 return 0;
  80                         ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
  81                         }
  82                 else if (EVP_PKEY_verify_init(ctx->pctx) <= 0)
  83                         return 0;
  84                 }
  85         else
  86                 {
  87                 if (ctx->pctx->pmeth->signctx_init)
  88                         {
  89                         if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
  90                                 return 0;
  91                         ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
  92                         }
  93                 else if (EVP_PKEY_sign_init(ctx->pctx) <= 0)
  94                         return 0;
  95                 }
  96         if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
  97                 return 0;
  98         if (pctx)
  99                 *pctx = ctx->pctx;
 100         if (!EVP_DigestInit_ex(ctx, type, e))
 101                 return 0;
 102         return 1;
 103         }
 104
 105 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 106                         const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 107         {
 108         return do_sigver_init(ctx, pctx, type, e, pkey, 0);
 109         }
 110
 111 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 112                         const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 113         {
 114         return do_sigver_init(ctx, pctx, type, e, pkey, 1);
 115         }
 116
 117
 118 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen)
 119         {
 120         int sctx, r = 0;
 121         if (ctx->pctx->pmeth->signctx)
 122                 sctx = 1;
 123         else
 124                 sctx = 0;
 125         if (sigret)
 126                 {
 127                 MS_STATIC EVP_MD_CTX tmp_ctx;
 128                 unsigned char md[EVP_MAX_MD_SIZE];
 129                 unsigned int mdlen;
 130                 EVP_MD_CTX_init(&tmp_ctx);
 131                 if (!EVP_MD_CTX_copy_ex(&tmp_ctx,ctx))
 132                         return 0;
 133                 if (sctx)
 134                         r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx,
 135                                         sigret, siglen, &tmp_ctx);
 136                 else
 137                         r = EVP_DigestFinal_ex(&tmp_ctx,md,&mdlen);
 138                 EVP_MD_CTX_cleanup(&tmp_ctx);
 139                 if (sctx || !r)
 140                         return r;
 141                 if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0)
 142                         return 0;
 143                 }
 144         else
 145                 {
 146                 if (sctx)
 147                         {
 148                         if (ctx->pctx->pmeth->signctx(ctx->pctx,
 149                                                 sigret, siglen, ctx) <= 0)
 150                                 return 0;
 151                         }
 152                 else if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, NULL,
 153                                                 EVP_MD_size(ctx->digest)) <= 0)
 154                         return 0;
 155                 }
 156         return 1;
 157         }
 158
 159 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, unsigned char *sig, size_t siglen)
 160         {
 161         MS_STATIC EVP_MD_CTX tmp_ctx;
 162         unsigned char md[EVP_MAX_MD_SIZE];
 163         int r;
 164         unsigned int mdlen;
 165         int vctx;
 166         if (ctx->pctx->pmeth->signctx)
 167                 vctx = 1;
 168         else
 169                 vctx = 0;
 170         EVP_MD_CTX_init(&tmp_ctx);
 171         if (!EVP_MD_CTX_copy_ex(&tmp_ctx,ctx))
 172                 return -1;
 173         if (vctx)
 174                 {
 175                 r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx,
 176                                         sig, siglen, &tmp_ctx);
 177                 }
 178         else
 179                 r = EVP_DigestFinal_ex(&tmp_ctx,md,&mdlen);
 180         EVP_MD_CTX_cleanup(&tmp_ctx);
 181         if (vctx || !r)
 182                 return r;
 183         return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
 184         }