xtea.c File Reference

XTEA 32-bit implementation. More...

#include <string.h>
#include "config.h"
#include "intreadwrite.h"
#include "mem.h"
#include "xtea.h"

Go to the source code of this file.

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.
void	av_xtea_le_init (AVXTEA *ctx, const uint8_t key[16])
	Initialize an AVXTEA context.
static void	xtea_crypt_ecb (AVXTEA *ctx, uint8_t *dst, const uint8_t *src, int decrypt, uint8_t *iv)
static void	xtea_le_crypt_ecb (AVXTEA *ctx, uint8_t *dst, const uint8_t *src, int decrypt, uint8_t *iv)
static void	xtea_crypt (AVXTEA *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt, void(*crypt)(AVXTEA *, uint8_t *, const uint8_t *, int, uint8_t *))
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.
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.

Detailed Description

XTEA 32-bit implementation.

Author

Samuel Pitoiset

Definition in file xtea.c.

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)

Referenced by xtea_crypt_ecb().

ESTEP

#define ESTEP	(		SUM,
			K0,
			K1 )

Value:

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

Referenced by xtea_crypt_ecb().

Function Documentation

xtea_crypt_ecb()

static void xtea_crypt_ecb ( AVXTEA * ctx, uint8_t * dst, const uint8_t * src, int decrypt, uint8_t * iv )

static

Definition at line 58 of file xtea.c.

Referenced by av_xtea_crypt().

xtea_le_crypt_ecb()

static void xtea_le_crypt_ecb ( AVXTEA * ctx, uint8_t * dst, const uint8_t * src, int decrypt, uint8_t * iv )

static

Definition at line 178 of file xtea.c.

Referenced by av_xtea_le_crypt().

xtea_crypt()

static void xtea_crypt ( AVXTEA * ctx, uint8_t * dst, const uint8_t * src, int count, uint8_t * iv, int decrypt, void(* crypt )(AVXTEA *, uint8_t *, const uint8_t *, int, uint8_t *) )

static

Definition at line 214 of file xtea.c.

Referenced by av_xtea_crypt(), and av_xtea_le_crypt().