/*
 * Copyright (c) 2006-2007 Christophe Devine
 * 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. 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 AND CONTRIBUTORS ``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.
 *
 * $Cryb$
 */

#ifndef CRYB_SHA512_H_INCLUDED
#define CRYB_SHA512_H_INCLUDED

#include <cryb/digest.h>

#define SHA512_BLOCK_LEN		128
#define SHA512_DIGEST_LEN		64

#define sha512_digest			cryb_sha512_digest
#define sha512_ctx			cryb_sha512_ctx
#define sha512_init			cryb_sha512_init
#define sha512_update			cryb_sha512_update
#define sha512_final			cryb_sha512_final
#define sha512_complete			cryb_sha512_complete

extern digest_algorithm sha512_digest;

/**
 * \brief          SHA-512 context structure
 */
typedef struct
{
    uint64_t total[2];		/*!< number of bytes processed  */
    uint64_t state[8];		/*!< intermediate digest state  */
    uint8_t buffer[128];	/*!< data block being processed */

    uint8_t ipad[128];		/*!< HMAC: inner padding        */
    uint8_t opad[128];		/*!< HMAC: outer padding        */
}
sha512_ctx;

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \brief          SHA-512 context setup
 *
 * \param ctx      context to be initialized
 */
void sha512_init( sha512_ctx *ctx );

/**
 * \brief          SHA-512 process buffer
 *
 * \param ctx      SHA-512 context
 * \param input    buffer holding the  data
 * \param ilen     length of the input data
 */
void sha512_update( sha512_ctx *ctx, const void *input, int ilen );

/**
 * \brief          SHA-512 final digest
 *
 * \param ctx      SHA-512 context
 * \param output   SHA-384/512 checksum result
 */
void sha512_final( sha512_ctx *ctx, unsigned char output[64] );

/**
 * \brief          Output = SHA-512( input buffer )
 *
 * \param input    buffer holding the  data
 * \param ilen     length of the input data
 * \param output   SHA-384/512 checksum result
 */
void sha512_complete( const void *input, int ilen,
           unsigned char output[64] );

/**
 * \brief          SHA-512 HMAC context setup
 *
 * \param ctx      HMAC context to be initialized
 * \param key      HMAC secret key
 * \param keylen   length of the HMAC key
 */
void sha512_hmac_init( sha512_ctx *ctx, unsigned char *key, int keylen );

/**
 * \brief          SHA-512 HMAC process buffer
 *
 * \param ctx      HMAC context
 * \param input    buffer holding the  data
 * \param ilen     length of the input data
 */
void sha512_hmac_update( sha512_ctx *ctx, unsigned char *input, int ilen );

/**
 * \brief          SHA-512 HMAC final digest
 *
 * \param ctx      HMAC context
 * \param output   SHA-384/512 HMAC checksum result
 */
void sha512_hmac_final( sha512_ctx *ctx, unsigned char output[64] );

/**
 * \brief          Output = HMAC-SHA-512( hmac key, input buffer )
 *
 * \param key      HMAC secret key
 * \param keylen   length of the HMAC key
 * \param input    buffer holding the  data
 * \param ilen     length of the input data
 * \param output   HMAC-SHA-384/512 result
 */
void sha512_hmac_complete( unsigned char *key, int keylen,
                unsigned char *input, int ilen,
                unsigned char output[64] );

#ifdef __cplusplus
}
#endif

#endif