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160
openssl-1.0.2f/demos/sign/sign.c
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160
openssl-1.0.2f/demos/sign/sign.c
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/* demos/sign/sign.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/*
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* sign-it.cpp - Simple test app using SSLeay envelopes to sign data
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* 29.9.1996, Sampo Kellomaki <sampo@iki.fi>
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*/
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/* converted to C - eay :-) */
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/*
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* reformated a bit and converted to use the more common functions: this was
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* initially written at the dawn of time :-) - Steve.
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*/
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#include <stdio.h>
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#include <openssl/rsa.h>
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#include <openssl/evp.h>
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#include <openssl/objects.h>
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#include <openssl/x509.h>
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#include <openssl/err.h>
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#include <openssl/pem.h>
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#include <openssl/ssl.h>
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int main()
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{
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int err;
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int sig_len;
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unsigned char sig_buf[4096];
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static char certfile[] = "cert.pem";
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static char keyfile[] = "key.pem";
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static char data[] = "I owe you...";
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EVP_MD_CTX md_ctx;
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EVP_PKEY *pkey;
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FILE *fp;
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X509 *x509;
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/*
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* Just load the crypto library error strings, SSL_load_error_strings()
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* loads the crypto AND the SSL ones
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*/
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/* SSL_load_error_strings(); */
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ERR_load_crypto_strings();
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/* Read private key */
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fp = fopen(keyfile, "r");
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if (fp == NULL)
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exit(1);
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pkey = PEM_read_PrivateKey(fp, NULL, NULL, NULL);
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fclose(fp);
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if (pkey == NULL) {
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ERR_print_errors_fp(stderr);
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exit(1);
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}
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/* Do the signature */
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EVP_SignInit(&md_ctx, EVP_sha1());
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EVP_SignUpdate(&md_ctx, data, strlen(data));
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sig_len = sizeof(sig_buf);
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err = EVP_SignFinal(&md_ctx, sig_buf, &sig_len, pkey);
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if (err != 1) {
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ERR_print_errors_fp(stderr);
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exit(1);
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}
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EVP_PKEY_free(pkey);
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/* Read public key */
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fp = fopen(certfile, "r");
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if (fp == NULL)
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exit(1);
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x509 = PEM_read_X509(fp, NULL, NULL, NULL);
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fclose(fp);
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if (x509 == NULL) {
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ERR_print_errors_fp(stderr);
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exit(1);
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}
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/* Get public key - eay */
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pkey = X509_get_pubkey(x509);
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if (pkey == NULL) {
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ERR_print_errors_fp(stderr);
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exit(1);
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}
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/* Verify the signature */
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EVP_VerifyInit(&md_ctx, EVP_sha1());
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EVP_VerifyUpdate(&md_ctx, data, strlen((char *)data));
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err = EVP_VerifyFinal(&md_ctx, sig_buf, sig_len, pkey);
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EVP_PKEY_free(pkey);
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if (err != 1) {
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ERR_print_errors_fp(stderr);
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exit(1);
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}
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printf("Signature Verified Ok.\n");
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return (0);
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}
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