DES

Data Structures
struct	AVDES

Functions
AVDES *	av_des_alloc (void)
	Allocate an AVDES context. More...
int	av_des_init (struct AVDES *d, const uint8_t *key, int key_bits, int decrypt)
	Initializes an AVDES context. More...
void	av_des_crypt (struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
	Encrypts / decrypts using the DES algorithm. More...
void	av_des_mac (struct AVDES *d, uint8_t *dst, const uint8_t *src, int count)
	Calculates CBC-MAC using the DES algorithm. More...

Detailed Description

Function Documentation

av_des_alloc()

AVDES * av_des_alloc

(

void

)

Allocate an AVDES context.

av_des_init()

int av_des_init	(	struct AVDES *	d,
		const uint8_t *	key,
		int	key_bits,
		int	decrypt
	)

Initializes an AVDES context.

Parameters

key_bits	must be 64 or 192
decrypt	0 for encryption/CBC-MAC, 1 for decryption

Returns

zero on success, negative value otherwise

av_des_crypt()

void av_des_crypt	(	struct AVDES *	d,
		uint8_t *	dst,
		const uint8_t *	src,
		int	count,
		uint8_t *	iv,
		int	decrypt
	)

Encrypts / decrypts using the DES algorithm.

Parameters

count	number of 8 byte blocks
dst	destination array, can be equal to src, must be 8-byte aligned
src	source array, can be equal to dst, must be 8-byte aligned, may be NULL
iv	initialization vector for CBC mode, if NULL then ECB will be used, must be 8-byte aligned
decrypt	0 for encryption, 1 for decryption

av_des_mac()

void av_des_mac	(	struct AVDES *	d,
		uint8_t *	dst,
		const uint8_t *	src,
		int	count
	)

Calculates CBC-MAC using the DES algorithm.

Parameters

count	number of 8 byte blocks
dst	destination array, can be equal to src, must be 8-byte aligned
src	source array, can be equal to dst, must be 8-byte aligned, may be NULL