HMAC

Enumerations
enum	AVHMACType {   AV_HMAC_MD5, AV_HMAC_SHA1, AV_HMAC_SHA224 = 10, AV_HMAC_SHA256,   AV_HMAC_SHA384, AV_HMAC_SHA512 }

Functions
AVHMAC *	av_hmac_alloc (enum AVHMACType type)
	Allocate an AVHMAC context.
void	av_hmac_free (AVHMAC *ctx)
	Free an AVHMAC context.
void	av_hmac_init (AVHMAC *ctx, const uint8_t *key, unsigned int keylen)
	Initialize an AVHMAC context with an authentication key.
void	av_hmac_update (AVHMAC *ctx, const uint8_t *data, unsigned int len)
	Hash data with the HMAC.
int	av_hmac_final (AVHMAC *ctx, uint8_t *out, unsigned int outlen)
	Finish hashing and output the HMAC digest.
int	av_hmac_calc (AVHMAC *ctx, const uint8_t *data, unsigned int len, const uint8_t *key, unsigned int keylen, uint8_t *out, unsigned int outlen)
	Hash an array of data with a key.

Detailed Description

Enumeration Type Documentation

enum AVHMACType

Enumerator:

AV_HMAC_MD5
AV_HMAC_SHA1
AV_HMAC_SHA224
AV_HMAC_SHA256
AV_HMAC_SHA384
AV_HMAC_SHA512

Definition at line 32 of file hmac.h.

Function Documentation

AVHMAC* av_hmac_alloc

(

enum AVHMACType

type

)

Allocate an AVHMAC context.

Parameters

type	The hash function used for the HMAC.

Definition at line 61 of file hmac.c.

Referenced by ff_srtp_set_crypto().

void av_hmac_free

(

AVHMAC *

ctx

)

Free an AVHMAC context.

Parameters

ctx	The context to free, may be NULL

Definition at line 126 of file hmac.c.

Referenced by ff_srtp_free().

void av_hmac_init	(	AVHMAC *	ctx,
		const uint8_t *	key,
		unsigned int	keylen
	)

Initialize an AVHMAC context with an authentication key.

Parameters

ctx	The HMAC context
key	The authentication key
keylen	The length of the key, in bytes

Definition at line 134 of file hmac.c.

Referenced by av_hmac_calc(), ff_srtp_decrypt(), and ff_srtp_encrypt().

void av_hmac_update	(	AVHMAC *	ctx,
		const uint8_t *	data,
		unsigned int	len
	)

Hash data with the HMAC.

Parameters

ctx	The HMAC context
data	The data to hash
len	The length of the data, in bytes

Definition at line 155 of file hmac.c.

Referenced by av_hmac_calc(), ff_srtp_decrypt(), and ff_srtp_encrypt().

int av_hmac_final	(	AVHMAC *	ctx,
		uint8_t *	out,
		unsigned int	outlen
	)

Finish hashing and output the HMAC digest.

Parameters

ctx	The HMAC context
out	The output buffer to write the digest into
outlen	The length of the out buffer, in bytes

Returns

The number of bytes written to out, or a negative error code.

Definition at line 160 of file hmac.c.

Referenced by av_hmac_calc(), ff_srtp_decrypt(), and ff_srtp_encrypt().

int av_hmac_calc	(	AVHMAC *	ctx,
		const uint8_t *	data,
		unsigned int	len,
		const uint8_t *	key,
		unsigned int	keylen,
		uint8_t *	out,
		unsigned int	outlen
	)

Hash an array of data with a key.

Parameters

ctx	The HMAC context
data	The data to hash
len	The length of the data, in bytes
key	The authentication key
keylen	The length of the key, in bytes
out	The output buffer to write the digest into
outlen	The length of the out buffer, in bytes

Returns

The number of bytes written to out, or a negative error code.

Definition at line 178 of file hmac.c.