text: /* ====================================================================
   * Copyright (c) 2016 The GmSSL Project.  All rights reserved.
   *
   * 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 above 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 acknowledgment:
   *    "This product includes software developed by the GmSSL Project.
   *    (http://gmssl.org/)"
   *
   * 4. The name "GmSSL Project" must not be used to endorse or promote
   *    products derived from this software without prior written
   *    permission. For written permission, please contact
   *    guanzhi1980@gmail.com.
   *
   * 5. Products derived from this software may not be called "GmSSL"
   *    nor may "GmSSL" appear in their names without prior written
   *    permission of the GmSSL Project.
   *
   * 6. Redistributions of any form whatsoever must retain the following
   *    acknowledgment:
   *    "This product includes software developed by the GmSSL Project
   *    (http://gmssl.org/)"
   *
   * THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
   * EXPRESSED 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 GmSSL PROJECT OR
   * ITS 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.
   * ====================================================================
   */
  
  #include <stdio.h>
  #include <string.h>
  #include <openssl/err.h>
  #include <openssl/evp.h>
  #include <openssl/bn.h>
  
  int main(void)
  {
  	char *s = "This ASCII string without null-terminator";
  	BIGNUM *bn = NULL;
  	BIGNUM *ret = NULL;
  	BIGNUM *range = NULL;
  
  	BN_hex2bn(&range, "ffffffffffffffffffffefffffffffffffffffff");
  	BN_hex2bn(&bn, "79317c1610c1fc018e9c53d89d59c108cd518608");
  
  	if (!BN_hash2bn(&ret, s, strlen(s), EVP_sha1(), range)) {
  		printf("BN_hash2bn() function failed\n");
  		return 0;
  	}
  	if (!ret) {
  		printf("shit\n");
  	}
  	printf("%s\n", BN_bn2hex(ret));
  	if (BN_cmp(ret, bn) != 0) {
  		printf("BN_hash2bn() test failed\n");
  		return 0;
  	}
  
  	printf("BN_hash2bn() test passed\n");
  	return 1;
  }
  