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/*
* Copyright (C) 2016 Oliver Hahm <oliver.hahm@inria.fr>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup sys_hashes_sha1 SHA-1
* @ingroup sys_hashes
* @brief Implementation of the SHA-1 hashing function
* @{
*
* @file
* @brief SHA-1 interface definition
*
* @author Wei Dai and others
* @author Oliver Hahm <oliver.hahm@inria.fr>
*/
/* This code is public-domain - it is based on libcrypt
* placed in the public domain by Wei Dai and other contributors. */
#ifndef _SHA1_H
#define _SHA1_H
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Length of SHA-1 digests in byte
*/
#define SHA1_DIGEST_LENGTH (20)
/**
* @brief Length of SHA-1 block in byte
*/
#define SHA1_BLOCK_LENGTH (64)
/**
* @brief SHA-1 algorithm context
* @internal
**/
typedef struct {
/** internal buffer */
uint32_t buffer[SHA1_BLOCK_LENGTH / sizeof(uint32_t)];
/** buffering current state of hashing */
uint32_t state[SHA1_DIGEST_LENGTH / sizeof(uint32_t)];
/** already processed bytes */
uint32_t byte_count;
/** internal state variable to keep track if the buffer is filled before
* proceeding to hash this block */
uint8_t buffer_offset;
/** internal state of the key buffer */
uint8_t key_buffer[SHA1_BLOCK_LENGTH];
/** temporary buffer for the inner hashing */
uint8_t inner_hash[SHA1_DIGEST_LENGTH];
} sha1_context;
/**
* @brief Initialize SHA-1 message digest context
*
* @param[in] ctx Pointer to the SHA-1 context to initialize
*/
void sha1_init(sha1_context *ctx);
/**
* @brief Update the SHA-1 context with a portion of the message being hashed
*
* @param[in] ctx Pointer to the SHA-1 context to update
* @param[in] data Input data
* @param[in] len Length of @p data
*/
void sha1_update(sha1_context *ctx, const void *data, size_t len);
/**
* @brief Finalizes the SHA-1 message digest
*
* @param[in] ctx Pointer to the SHA-1 context
* @param[out] digest Result location, must be 20 byte
*
*/
void sha1_final(sha1_context *ctx, void *digest);
/**
* @brief Calculate a SHA1 hash from the given data
*
* @param[out] digest Result location, must be 20 byte
* @param[in] data Input data
* @param[in] len Length of @p buf
*/
void sha1(void *digest, const void *data, size_t len);
/**
* @brief Initialize SHA-1 message digest context with MAC
*
* @param[in] ctx Pointer to the SHA-1 context to initialize
* @param[in] key Key used in the HMAC-SHA1 computation
* @param[in] key_length The size in bytes of @p key
*/
void sha1_init_hmac(sha1_context *ctx, const void *key, size_t key_length);
/**
* @brief Finalizes the SHA-1 message digest with MAC
*
* @param[in] ctx Pointer to the SHA-1 context
* @param[out] digest Result location, must be 20 byte
*/
void sha1_final_hmac(sha1_context *ctx, void *digest);
#ifdef __cplusplus
}
#endif
#endif /* _SHA1_H */
/** @} */
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