SHA

SHA-1 and SHA-256 (Secure Hash Algorithm) hash function implementations. More...

Files
file	sha.h
	Public header for SHA-1 & SHA-256 hash function implementations.

Functions
struct AVSHA *	av_sha_alloc (void)
	Allocate an AVSHA context. More...
int	av_sha_init (struct AVSHA *context, int bits)
	Initialize SHA-1 or SHA-2 hashing. More...
void	av_sha_update (struct AVSHA *ctx, const uint8_t *data, size_t len)
	Update hash value. More...
void	av_sha_final (struct AVSHA *context, uint8_t *digest)
	Finish hashing and output digest value. More...

Variables
const int	av_sha_size

Detailed Description

SHA-1 and SHA-256 (Secure Hash Algorithm) hash function implementations.

This module supports the following SHA hash functions:

• SHA-1: 160 bits
• SHA-224: 224 bits, as a variant of SHA-2
• SHA-256: 256 bits, as a variant of SHA-2

See also

For SHA-384, SHA-512, and variants thereof, see SHA-512.

Function Documentation

av_sha_alloc()

struct AVSHA * av_sha_alloc

(

void

)

Allocate an AVSHA context.

av_sha_init()

int av_sha_init	(	struct AVSHA *	context,
		int	bits
	)

Initialize SHA-1 or SHA-2 hashing.

Parameters

context	pointer to the function context (of size av_sha_size)
bits	number of bits in digest (SHA-1 - 160 bits, SHA-2 224 or 256 bits)

Returns

zero if initialization succeeded, -1 otherwise

av_sha_update()

void av_sha_update	(	struct AVSHA *	ctx,
		const uint8_t *	data,
		size_t	len
	)

Update hash value.

Parameters

ctx	hash function context
data	input data to update hash with
len	input data length

av_sha_final()

void av_sha_final	(	struct AVSHA *	context,
		uint8_t *	digest
	)

Finish hashing and output digest value.

Parameters

context	hash function context
digest	buffer where output digest value is stored

Variable Documentation

av_sha_size

const int av_sha_size

extern