ref: c23504631008ce0bfaa5bec48acb2b04f4b49fd9
dir: /sys/src/ape/lib/openssl/demos/sign/sign.c/
/* demos/sign/sign.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* sign-it.cpp - Simple test app using SSLeay envelopes to sign data
29.9.1996, Sampo Kellomaki <sampo@iki.fi> */
/* converted to C - eay :-) */
/* reformated a bit and converted to use the more common functions: this was
* initially written at the dawn of time :-) - Steve.
*/
#include <stdio.h>
#include <openssl/rsa.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
int main ()
{
int err;
int sig_len;
unsigned char sig_buf [4096];
static char certfile[] = "cert.pem";
static char keyfile[] = "key.pem";
static char data[] = "I owe you...";
EVP_MD_CTX md_ctx;
EVP_PKEY * pkey;
FILE * fp;
X509 * x509;
/* Just load the crypto library error strings,
* SSL_load_error_strings() loads the crypto AND the SSL ones */
/* SSL_load_error_strings();*/
ERR_load_crypto_strings();
/* Read private key */
fp = fopen (keyfile, "r");
if (fp == NULL) exit (1);
pkey = PEM_read_PrivateKey(fp, NULL, NULL, NULL);
fclose (fp);
if (pkey == NULL) {
ERR_print_errors_fp (stderr);
exit (1);
}
/* Do the signature */
EVP_SignInit (&md_ctx, EVP_sha1());
EVP_SignUpdate (&md_ctx, data, strlen(data));
sig_len = sizeof(sig_buf);
err = EVP_SignFinal (&md_ctx, sig_buf, &sig_len, pkey);
if (err != 1) {
ERR_print_errors_fp(stderr);
exit (1);
}
EVP_PKEY_free (pkey);
/* Read public key */
fp = fopen (certfile, "r");
if (fp == NULL) exit (1);
x509 = PEM_read_X509(fp, NULL, NULL, NULL);
fclose (fp);
if (x509 == NULL) {
ERR_print_errors_fp (stderr);
exit (1);
}
/* Get public key - eay */
pkey=X509_get_pubkey(x509);
if (pkey == NULL) {
ERR_print_errors_fp (stderr);
exit (1);
}
/* Verify the signature */
EVP_VerifyInit (&md_ctx, EVP_sha1());
EVP_VerifyUpdate (&md_ctx, data, strlen((char*)data));
err = EVP_VerifyFinal (&md_ctx, sig_buf, sig_len, pkey);
EVP_PKEY_free (pkey);
if (err != 1) {
ERR_print_errors_fp (stderr);
exit (1);
}
printf ("Signature Verified Ok.\n");
return(0);
}