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
77int 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}
154