demos/sign/sign.c

   1 /* demos/sign/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 /* sign-it.cpp  -  Simple test app using SSLeay envelopes to sign data
  60    29.9.1996, Sampo Kellomaki <sampo@iki.fi> */
  61
  62 /* converted to C - eay :-) */
  63
  64 /* reformated a bit and converted to use the more common functions: this was
  65  * initially written at the dawn of time :-) - Steve.
  66  */
  67
  68 #include <stdio.h>
  69 #include <openssl/rsa.h>
  70 #include <openssl/evp.h>
  71 #include <openssl/objects.h>
  72 #include <openssl/x509.h>
  73 #include <openssl/err.h>
  74 #include <openssl/pem.h>
  75 #include <openssl/ssl.h>
  76
  77 int main ()
  78 {
  79   int err;
  80   int sig_len;
  81   unsigned char sig_buf [4096];
  82   static char certfile[] = "cert.pem";
  83   static char keyfile[]  = "key.pem";
  84   static char data[]     = "I owe you...";
  85   EVP_MD_CTX     md_ctx;
  86   EVP_PKEY *      pkey;
  87   FILE *          fp;
  88   X509 *        x509;
  89
  90   /* Just load the crypto library error strings,
  91    * SSL_load_error_strings() loads the crypto AND the SSL ones */
  92   /* SSL_load_error_strings();*/
  93   ERR_load_crypto_strings();
  94
  95   /* Read private key */
  96
  97   fp = fopen (keyfile, "r");
  98   if (fp == NULL) exit (1);
  99   pkey = PEM_read_PrivateKey(fp, NULL, NULL, NULL);
 100   fclose (fp);
 101
 102   if (pkey == NULL) {
 103         ERR_print_errors_fp (stderr);
 104         exit (1);
 105   }
 106
 107   /* Do the signature */
 108
 109   EVP_SignInit   (&md_ctx, EVP_sha1());
 110   EVP_SignUpdate (&md_ctx, data, strlen(data));
 111   sig_len = sizeof(sig_buf);
 112   err = EVP_SignFinal (&md_ctx, sig_buf, &sig_len, pkey);
 113
 114   if (err != 1) {
 115         ERR_print_errors_fp(stderr);
 116         exit (1);
 117   }
 118
 119   EVP_PKEY_free (pkey);
 120
 121   /* Read public key */
 122
 123   fp = fopen (certfile, "r");
 124   if (fp == NULL) exit (1);
 125   x509 = PEM_read_X509(fp, NULL, NULL, NULL);
 126   fclose (fp);
 127
 128   if (x509 == NULL) {
 129         ERR_print_errors_fp (stderr);
 130         exit (1);
 131   }
 132
 133   /* Get public key - eay */
 134   pkey=X509_get_pubkey(x509);
 135   if (pkey == NULL) {
 136         ERR_print_errors_fp (stderr);
 137         exit (1);
 138   }
 139
 140   /* Verify the signature */
 141
 142   EVP_VerifyInit   (&md_ctx, EVP_sha1());
 143   EVP_VerifyUpdate (&md_ctx, data, strlen((char*)data));
 144   err = EVP_VerifyFinal (&md_ctx, sig_buf, sig_len, pkey);
 145   EVP_PKEY_free (pkey);
 146
 147   if (err != 1) {
 148         ERR_print_errors_fp (stderr);
 149         exit (1);
 150   }
 151   printf ("Signature Verified Ok.\n");
 152   return(0);
 153 }