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/*
* Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
* 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 acknowledgement:
* This product includes software developed by Niels Provos.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
/*
* Modified by <hongli@phusion.nl> on 2009-10-24:
*
* - Wrapped into C++ namespace.
* - Changed some types (e.g. u_int8_t to uint8_t as defined in stdint.h)
* for easier compilation.
* - Moved some macros to the .c file.
*/
#ifndef _PASSENGER_BCRYPT_H_
#define _PASSENGER_BCRYPT_H_
#include <stdint.h>
#define BCRYPT_MAXSALT 16 /* Precomputation is just so nice */
#define BCRYPT_SALT_OUTPUT_SIZE (7 + (BCRYPT_MAXSALT * 4 + 2) / 3 + 1)
#define BCRYPT_OUTPUT_SIZE 128
/*
* Given a logarithmic cost parameter, generates a salt for use with bcrypt().
*
* output: the computed salt will be stored here. This buffer must be
* at least BCRYPT_SALT_OUTPUT_SIZE bytes. The result will be
* null-terminated.
* log_rounds: the logarithmic cost.
* rseed: a seed of BCRYPT_MAXSALT bytes. Should be obtained from a
* cryptographically secure random source.
* Returns: output
*/
char *bcrypt_gensalt(char *output, unsigned int log_rounds, uint8_t *rseed);
/*
* Given a secret and a salt, generates a salted hash (which you can then store safely).
*
* output: the computed salted hash will be stored here. This buffer must
* be at least BCRYPT_OUTPUT_SIZE bytes, and will become null-terminated.
* key: A null-terminated secret.
* salt: The salt, as generated by bcrypt_gensalt().
* Returns: output on success, NULL on error.
*/
char *bcrypt(char *output, const char *key, const char *salt);
#endif /* _PASSENGER_BCRYPT_H_ */
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