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/*
* Copyright 2009 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU Lesser General
* Public License. You may obtain a copy of the GNU Lesser General
* Public License Version 2.1 or later at the following locations:
*
* http://www.opensource.org/licenses/lgpl-license.html
* http://www.gnu.org/copyleft/lgpl.html
*/
/*!
* @file shw_hash.h
*
* This file contains definitions for use of the (internal) SHW hash
* software computation. It defines the usual three steps:
*
* - #shw_hash_init()
* - #shw_hash_update()
* - #shw_hash_final()
*
* The only other item of note to callers is #SHW_HASH_LEN, which is the number
* of bytes calculated for the hash.
*/
#ifndef SHW_HASH_H
#define SHW_HASH_H
/*! Define which gives the number of bytes available in an hash result */
#define SHW_HASH_LEN 32
/* Define which matches block length in bytes of the underlying hash */
#define SHW_HASH_BLOCK_LEN 64
/* "Internal" define which matches SHA-256 state size (32-bit words) */
#define SHW_HASH_STATE_WORDS 8
/* "Internal" define which matches word length in blocks of the underlying
hash. */
#define SHW_HASH_BLOCK_WORD_SIZE 16
#define SHW_HASH_STATE_SIZE 32
/*!
* State for a SHA-1/SHA-2 Hash
*
* (Note to maintainers: state needs to be updated to uint64_t to handle
* SHA-384/SHA-512)... And bit_count to uint128_t (heh).
*/
typedef struct shw_hash_state {
unsigned int partial_count_bytes; /*!< Number of bytes of message sitting
* in @c partial_block */
uint8_t partial_block[SHW_HASH_BLOCK_LEN]; /*!< Data waiting to be processed as a block */
uint32_t state[SHW_HASH_STATE_WORDS]; /*!< Current hash state variables */
uint64_t bit_count; /*!< Number of bits sent through the update function */
} shw_hash_state_t;
/*!
* Initialize the hash state structure
*
* @param state Address of hash state structure.
* @param algorithm Which hash algorithm to use (must be FSL_HASH_ALG_SHA256)
*
* @return FSL_RETURN_OK_S if all went well, otherwise an error code.
*/
fsl_shw_return_t shw_hash_init(shw_hash_state_t * state,
fsl_shw_hash_alg_t algorithm);
/*!
* Put data into the hash calculation
*
* @param state Address of hash state structure.
* @param msg Address of the message data for the hash.
* @param msg_len Number of bytes of @c msg.
*
* @return FSL_RETURN_OK_S if all went well, otherwise an error code.
*/
fsl_shw_return_t shw_hash_update(shw_hash_state_t * state,
const uint8_t * msg, unsigned int msg_len);
/*!
* Calculate the final hash value
*
* @param state Address of hash state structure.
* @param hash Address of location to store the hash.
* @param hash_len Number of bytes of @c hash to be stored.
*
* @return FSL_RETURN_OK_S if all went well, FSL_RETURN_BAD_DATA_LENGTH_S if
* hash_len is too long, otherwise an error code.
*/
fsl_shw_return_t shw_hash_final(shw_hash_state_t * state,
uint8_t * hash, unsigned int hash_len);
#endif /* SHW_HASH_H */
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