sha256.h File Reference

Header definitions for the SHA256 hash function. More...

Detailed Description

Header definitions for the SHA256 hash function.

Author

Colin Percival

Christian Mehlis

Rene Kijewski

Hermann Lelong

Definition in file sha256.h.

#include <inttypes.h>
#include <stddef.h>
#include "hashes/sha2xx_common.h"

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Data Structures
struct	hmac_context_t
	Context for HMAC operations based on sha256. More...
struct	sha256_chain_idx_elm_t
	sha256-chain indexed element More...

Macros
#define	SHA256_DIGEST_LENGTH   32
	Length of SHA256 digests in bytes.
#define	SHA256_INTERNAL_BLOCK_SIZE   (64)
	512 Bit (64 Byte) internally used block size for sha256

Typedefs
typedef sha2xx_context_t	sha256_context_t
	Context for cipher operations based on sha256.

Functions
void	sha256_init (sha256_context_t *ctx)
	SHA-256 initialization.
static void	sha256_update (sha256_context_t *ctx, const void *data, size_t len)
	Add bytes into the hash.
static void	sha256_final (sha256_context_t *ctx, void *digest)
	SHA-256 finalization.
void	sha256 (const void *data, size_t len, void *digest)
	A wrapper function to simplify the generation of a hash, this is useful for generating sha256 for one buffer.
void	hmac_sha256_init (hmac_context_t *ctx, const void *key, size_t key_length)
	hmac_sha256_init HMAC SHA-256 calculation.
void	hmac_sha256_update (hmac_context_t *ctx, const void *data, size_t len)
	hmac_sha256_update Add data bytes for HMAC calculation
void	hmac_sha256_final (hmac_context_t *ctx, void *digest)
	hmac_sha256_final HMAC SHA-256 finalization.
void	hmac_sha256 (const void *key, size_t key_length, const void *data, size_t len, void *digest)
	function to compute a hmac-sha256 from a given message
void *	sha256_chain (const void *seed, size_t seed_length, size_t elements, void *tail_element)
	function to produce a hash chain starting with a given seed element.
void *	sha256_chain_with_waypoints (const void *seed, size_t seed_length, size_t elements, void *tail_element, sha256_chain_idx_elm_t *waypoints, size_t *waypoints_length)
	function to produce a hash chain starting with a given seed element.
int	sha256_chain_verify_element (void *element, size_t element_index, void *tail_element, size_t chain_length)
	function to verify if a given chain element is part of the chain.