demos/sign/sign.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 /*
  59  * sign-it.cpp - Simple test app using EVP envelopes to sign data
  60  * 29.9.1996, Sampo Kellomaki <sampo@iki.fi>
  61  */
  62
  63 /* converted to C - eay :-) */
  64
  65 /*
  66  * reformated a bit and converted to use the more common functions: this was
  67  * initially written at the dawn of time :-) - Steve.
  68  */
  69
  70 #include <stdio.h>
  71 #include <openssl/rsa.h>
  72 #include <openssl/evp.h>
  73 #include <openssl/objects.h>
  74 #include <openssl/x509.h>
  75 #include <openssl/err.h>
  76 #include <openssl/pem.h>
  77 #include <openssl/ssl.h>
  78
  79 int main()
  80 {
  81     int err;
  82     int sig_len;
  83     unsigned char sig_buf[4096];
  84     static char certfile[] = "cert.pem";
  85     static char keyfile[] = "key.pem";
  86     static char data[] = "I owe you...";
  87     EVP_MD_CTX md_ctx;
  88     EVP_PKEY *pkey;
  89     FILE *fp;
  90     X509 *x509;
  91
  92     /*
  93      * Just load the crypto library error strings, SSL_load_error_strings()
  94      * loads the crypto AND the SSL ones
  95      */
  96     /* SSL_load_error_strings(); */
  97     ERR_load_crypto_strings();
  98
  99     /* Read private key */
 100
 101     fp = fopen(keyfile, "r");
 102     if (fp == NULL)
 103         exit(1);
 104     pkey = PEM_read_PrivateKey(fp, NULL, NULL, NULL);
 105     fclose(fp);
 106
 107     if (pkey == NULL) {
 108         ERR_print_errors_fp(stderr);
 109         exit(1);
 110     }
 111
 112     /* Do the signature */
 113
 114     EVP_SignInit(&md_ctx, EVP_sha1());
 115     EVP_SignUpdate(&md_ctx, data, strlen(data));
 116     sig_len = sizeof(sig_buf);
 117     err = EVP_SignFinal(&md_ctx, sig_buf, &sig_len, pkey);
 118
 119     if (err != 1) {
 120         ERR_print_errors_fp(stderr);
 121         exit(1);
 122     }
 123
 124     EVP_PKEY_free(pkey);
 125
 126     /* Read public key */
 127
 128     fp = fopen(certfile, "r");
 129     if (fp == NULL)
 130         exit(1);
 131     x509 = PEM_read_X509(fp, NULL, NULL, NULL);
 132     fclose(fp);
 133
 134     if (x509 == NULL) {
 135         ERR_print_errors_fp(stderr);
 136         exit(1);
 137     }
 138
 139     /* Get public key - eay */
 140     pkey = X509_get_pubkey(x509);
 141     if (pkey == NULL) {
 142         ERR_print_errors_fp(stderr);
 143         exit(1);
 144     }
 145
 146     /* Verify the signature */
 147
 148     EVP_VerifyInit(&md_ctx, EVP_sha1());
 149     EVP_VerifyUpdate(&md_ctx, data, strlen((char *)data));
 150     err = EVP_VerifyFinal(&md_ctx, sig_buf, sig_len, pkey);
 151     EVP_PKEY_free(pkey);
 152
 153     if (err != 1) {
 154         ERR_print_errors_fp(stderr);
 155         exit(1);
 156     }
 157     printf("Signature Verified Ok.\n");
 158     return (0);
 159 }