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 /*
  60  * sign-it.cpp - Simple test app using SSLeay envelopes to sign data
  61  * 29.9.1996, Sampo Kellomaki <sampo@iki.fi>
  62  */
  63
  64 /* converted to C - eay :-) */
  65
  66 /*
  67  * reformated a bit and converted to use the more common functions: this was
  68  * initially written at the dawn of time :-) - Steve.
  69  */
  70
  71 #include <stdio.h>
  72 #include <openssl/rsa.h>
  73 #include <openssl/evp.h>
  74 #include <openssl/objects.h>
  75 #include <openssl/x509.h>
  76 #include <openssl/err.h>
  77 #include <openssl/pem.h>
  78 #include <openssl/ssl.h>
  79
  80 int main()
  81 {
  82     int err;
  83     int sig_len;
  84     unsigned char sig_buf[4096];
  85     static char certfile[] = "cert.pem";
  86     static char keyfile[] = "key.pem";
  87     static char data[] = "I owe you...";
  88     EVP_MD_CTX md_ctx;
  89     EVP_PKEY *pkey;
  90     FILE *fp;
  91     X509 *x509;
  92
  93     /*
  94      * Just load the crypto library error strings, SSL_load_error_strings()
  95      * loads the crypto AND the SSL ones
  96      */
  97     /* SSL_load_error_strings(); */
  98     ERR_load_crypto_strings();
  99
 100     /* Read private key */
 101
 102     fp = fopen(keyfile, "r");
 103     if (fp == NULL)
 104         exit(1);
 105     pkey = PEM_read_PrivateKey(fp, NULL, NULL, NULL);
 106     fclose(fp);
 107
 108     if (pkey == NULL) {
 109         ERR_print_errors_fp(stderr);
 110         exit(1);
 111     }
 112
 113     /* Do the signature */
 114
 115     EVP_SignInit(&md_ctx, EVP_sha1());
 116     EVP_SignUpdate(&md_ctx, data, strlen(data));
 117     sig_len = sizeof(sig_buf);
 118     err = EVP_SignFinal(&md_ctx, sig_buf, &sig_len, pkey);
 119
 120     if (err != 1) {
 121         ERR_print_errors_fp(stderr);
 122         exit(1);
 123     }
 124
 125     EVP_PKEY_free(pkey);
 126
 127     /* Read public key */
 128
 129     fp = fopen(certfile, "r");
 130     if (fp == NULL)
 131         exit(1);
 132     x509 = PEM_read_X509(fp, NULL, NULL, NULL);
 133     fclose(fp);
 134
 135     if (x509 == NULL) {
 136         ERR_print_errors_fp(stderr);
 137         exit(1);
 138     }
 139
 140     /* Get public key - eay */
 141     pkey = X509_get_pubkey(x509);
 142     if (pkey == NULL) {
 143         ERR_print_errors_fp(stderr);
 144         exit(1);
 145     }
 146
 147     /* Verify the signature */
 148
 149     EVP_VerifyInit(&md_ctx, EVP_sha1());
 150     EVP_VerifyUpdate(&md_ctx, data, strlen((char *)data));
 151     err = EVP_VerifyFinal(&md_ctx, sig_buf, sig_len, pkey);
 152     EVP_PKEY_free(pkey);
 153
 154     if (err != 1) {
 155         ERR_print_errors_fp(stderr);
 156         exit(1);
 157     }
 158     printf("Signature Verified Ok.\n");
 159     return (0);
 160 }