xtea.c File Reference

XTEA 32-bit implementation. More...

#include "avutil.h"
#include "common.h"
#include "intreadwrite.h"
#include "mem.h"
#include "xtea.h"

Macros
#define	DSTEP(SUM, K0, K1)
#define	ESTEP(SUM, K0, K1)

Functions
AVXTEA *	av_xtea_alloc (void)
	Allocate an AVXTEA context.
void	av_xtea_init (AVXTEA *ctx, const uint8_t key[16])
	Initialize an AVXTEA context. More...
void	av_xtea_le_init (AVXTEA *ctx, const uint8_t key[16])
	Initialize an AVXTEA context. More...
void	av_xtea_crypt (AVXTEA *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
	Encrypt or decrypt a buffer using a previously initialized context, in big endian format. More...
void	av_xtea_le_crypt (AVXTEA *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
	Encrypt or decrypt a buffer using a previously initialized context, in little endian format. More...

Detailed Description

XTEA 32-bit implementation.

Author

Samuel Pitoiset

Macro Definition Documentation

DSTEP

#define DSTEP	(		SUM,
			K0,
			K1
	)

Value:

v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (SUM + K0); \
            v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (SUM - 0x9E3779B9U + K1)

ESTEP

#define ESTEP	(		SUM,
			K0,
			K1
	)

Value:

v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (SUM + K0);\
            v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (SUM + 0x9E3779B9U + K1)