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 "internal/cryptlib.h"
  61 #include <openssl/evp.h>
  62 #include <openssl/objects.h>
  63 #include <openssl/x509.h>
  64 #include "internal/evp_int.h"
  65
  66 int EVP_SignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
  67                   unsigned int *siglen, EVP_PKEY *pkey)
  68 {
  69     unsigned char m[EVP_MAX_MD_SIZE];
  70     unsigned int m_len = 0;
  71     int i = 0;
  72     size_t sltmp;
  73     EVP_PKEY_CTX *pkctx = NULL;
  74
  75     *siglen = 0;
  76     if (EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_FINALISE)) {
  77         if (!EVP_DigestFinal_ex(ctx, m, &m_len))
  78             goto err;
  79     } else {
  80         int rv = 0;
  81         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_create();
  82         if (tmp_ctx == NULL) {
  83             EVPerr(EVP_F_EVP_SIGNFINAL, ERR_R_MALLOC_FAILURE);
  84             return 0;
  85         }
  86         rv = EVP_MD_CTX_copy_ex(tmp_ctx, ctx);
  87         if (rv)
  88             rv = EVP_DigestFinal_ex(tmp_ctx, m, &m_len);
  89         EVP_MD_CTX_destroy(tmp_ctx);
  90         if (!rv)
  91             return 0;
  92     }
  93
  94     sltmp = (size_t)EVP_PKEY_size(pkey);
  95     i = 0;
  96     pkctx = EVP_PKEY_CTX_new(pkey, NULL);
  97     if (pkctx == NULL)
  98         goto err;
  99     if (EVP_PKEY_sign_init(pkctx) <= 0)
 100         goto err;
 101     if (EVP_PKEY_CTX_set_signature_md(pkctx, EVP_MD_CTX_md(ctx)) <= 0)
 102         goto err;
 103     if (EVP_PKEY_sign(pkctx, sigret, &sltmp, m, m_len) <= 0)
 104         goto err;
 105     *siglen = sltmp;
 106     i = 1;
 107  err:
 108     EVP_PKEY_CTX_free(pkctx);
 109     return i;
 110 }