libavutil/aes.c File Reference

#include "common.h"
#include "aes.h"

Go to the source code of this file.

Data Structures
union	av_aes_block
struct	AVAES
Functions
static void	addkey (av_aes_block *dst, const av_aes_block *src, const av_aes_block *round_key)
static void	subshift (av_aes_block s0[2], int s, const uint8_t *box)
static int	mix_core (uint32_t multbl[][256], int a, int b, int c, int d)
static void	mix (av_aes_block state[2], uint32_t multbl[][256], int s1, int s3)
static void	crypt (AVAES *a, int s, const uint8_t *sbox, uint32_t multbl[][256])
void	av_aes_crypt (AVAES *a, uint8_t *dst_, const uint8_t *src_, int count, uint8_t *iv_, int decrypt)
	Encrypt or decrypt a buffer using a previously initialized context.
static void	init_multbl2 (uint8_t tbl[1024], const int c[4], const uint8_t *log8, const uint8_t *alog8, const uint8_t *sbox)
int	av_aes_init (AVAES *a, const uint8_t *key, int key_bits, int decrypt)
	Initialize an AVAES context.
Variables
const int	av_aes_size = sizeof(AVAES)
static const uint8_t	rcon [10]
static uint8_t	sbox [256]
static uint8_t	inv_sbox [256]
static uint32_t	enc_multbl [4][256]
static uint32_t	dec_multbl [4][256]

---

Function Documentation

static void addkey	(	av_aes_block *	dst,
		const av_aes_block *	src,
		const av_aes_block *	round_key
	)			[inline, static]

Definition at line 57 of file aes.c.

Referenced by av_aes_crypt(), and crypt().

void av_aes_crypt	(	struct AVAES *	a,
		uint8_t *	dst,
		const uint8_t *	src,
		int	count,
		uint8_t *	iv,
		int	decrypt
	)

Encrypt or decrypt a buffer using a previously initialized context.

Parameters:

	count	number of 16 byte blocks
	dst	destination array, can be equal to src
	src	source array, can be equal to dst
	iv	initialization vector for CBC mode, if NULL then ECB will be used
	decrypt	0 for encryption, 1 for decryption

Definition at line 98 of file aes.c.

Referenced by crypto_read(), and mxf_decrypt_triplet().

int av_aes_init	(	struct AVAES *	a,
		const uint8_t *	key,
		int	key_bits,
		int	decrypt
	)

Initialize an AVAES context.

Parameters:

	key_bits	128, 192 or 256
	decrypt	0 for encryption, 1 for decryption

Definition at line 136 of file aes.c.

Referenced by crypto_open(), and mxf_decrypt_triplet().

static void crypt	(	AVAES *	a,
		int	s,
		const uint8_t *	sbox,
		uint32_t	multbl[][256]
	)			[inline, static]

Definition at line 88 of file aes.c.

Referenced by av_aes_crypt().

static void init_multbl2	(	uint8_t	tbl[1024],
		const int	c[4],
		const uint8_t *	log8,
		const uint8_t *	alog8,
		const uint8_t *	sbox
	)			[static]

Definition at line 122 of file aes.c.

Referenced by av_aes_init().

static void mix	(	av_aes_block	state[2],
		uint32_t	multbl[][256],
		int	s1,
		int	s3
	)			[inline, static]

Definition at line 80 of file aes.c.

static int mix_core	(	uint32_t	multbl[][256],
		int	a,
		int	b,
		int	c,
		int	d
	)			[inline, static]

Definition at line 71 of file aes.c.

Referenced by mix().

static void subshift	(	av_aes_block	s0[2],
		int	s,
		const uint8_t *	box
	)			[static]

Definition at line 62 of file aes.c.

Referenced by av_aes_init(), and crypt().

---

Variable Documentation

const int av_aes_size = sizeof(AVAES)

Definition at line 41 of file aes.c.

Referenced by crypto_open(), and mxf_decrypt_triplet().

uint32_t dec_multbl[4][256] [static]

Definition at line 54 of file aes.c.

Referenced by av_aes_crypt(), and av_aes_init().

uint32_t enc_multbl[4][256] [static]

Definition at line 53 of file aes.c.

Referenced by av_aes_crypt(), and av_aes_init().

uint8_t inv_sbox[256] [static]

Definition at line 48 of file aes.c.

Referenced by av_aes_crypt(), and av_aes_init().

const uint8_t rcon[10] [static]

Initial value:

 {
  0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36
}

Definition at line 43 of file aes.c.

Referenced by av_aes_init().

uint8_t sbox[256] [static]

Definition at line 47 of file aes.c.

Referenced by av_aes_crypt(), and av_aes_init().