Cryptlib/OpenSSL/crypto/evp/p_sign.c

   1 /* crypto/evp/p_sign.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  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
  65 #ifdef undef
  66 void EVP_SignInit(EVP_MD_CTX *ctx, EVP_MD *type)
  67 {
  68     EVP_DigestInit_ex(ctx, type);
  69 }
  70
  71 void EVP_SignUpdate(EVP_MD_CTX *ctx, unsigned char *data, unsigned int count)
  72 {
  73     EVP_DigestUpdate(ctx, data, count);
  74 }
  75 #endif
  76
  77 int EVP_SignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
  78                   unsigned int *siglen, EVP_PKEY *pkey)
  79 {
  80     unsigned char m[EVP_MAX_MD_SIZE];
  81     unsigned int m_len;
  82     int i = 0, ok = 0, v;
  83     EVP_MD_CTX tmp_ctx;
  84     EVP_PKEY_CTX *pkctx = NULL;
  85
  86     *siglen = 0;
  87     EVP_MD_CTX_init(&tmp_ctx);
  88     if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx))
  89         goto err;
  90     if (!EVP_DigestFinal_ex(&tmp_ctx, &(m[0]), &m_len))
  91         goto err;
  92     EVP_MD_CTX_cleanup(&tmp_ctx);
  93
  94     if (ctx->digest->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE) {
  95         size_t sltmp = (size_t)EVP_PKEY_size(pkey);
  96         i = 0;
  97         pkctx = EVP_PKEY_CTX_new(pkey, NULL);
  98         if (!pkctx)
  99             goto err;
 100         if (EVP_PKEY_sign_init(pkctx) <= 0)
 101             goto err;
 102         if (EVP_PKEY_CTX_set_signature_md(pkctx, ctx->digest) <= 0)
 103             goto err;
 104         if (EVP_PKEY_sign(pkctx, sigret, &sltmp, m, m_len) <= 0)
 105             goto err;
 106         *siglen = sltmp;
 107         i = 1;
 108  err:
 109         EVP_PKEY_CTX_free(pkctx);
 110         return i;
 111     }
 112
 113     for (i = 0; i < 4; i++) {
 114         v = ctx->digest->required_pkey_type[i];
 115         if (v == 0)
 116             break;
 117         if (pkey->type == v) {
 118             ok = 1;
 119             break;
 120         }
 121     }
 122     if (!ok) {
 123         EVPerr(EVP_F_EVP_SIGNFINAL, EVP_R_WRONG_PUBLIC_KEY_TYPE);
 124         return (0);
 125     }
 126
 127     if (ctx->digest->sign == NULL) {
 128         EVPerr(EVP_F_EVP_SIGNFINAL, EVP_R_NO_SIGN_FUNCTION_CONFIGURED);
 129         return (0);
 130     }
 131     return (ctx->digest->sign(ctx->digest->type, m, m_len, sigret, siglen,
 132                               pkey->pkey.ptr));
 133 }