chacha.c File Reference

#include <openssl/chacha.h>
#include <assert.h>
#include <string.h>
#include <openssl/cpu.h>
#include "../internal.h"

Macros
#define	U8TO32_LITTLE(p)
#define	ROTATE(v, n)   (((v) << (n)) | ((v) >> (32 - (n))))
#define	U32TO8_LITTLE(p, v)
#define	QUARTERROUND(a, b, c, d)

Functions
void	CRYPTO_chacha_20 (uint8_t *out, const uint8_t *in, size_t in_len, const uint8_t key[32], const uint8_t nonce[12], uint32_t counter)

Macro Definition Documentation

QUARTERROUND

#define QUARTERROUND	(		a,
			b,
			c,
			d
	)

Value:

x[a] += x[b]; x[d] = ROTATE(x[d] ^ x[a], 16); \
  x[c] += x[d]; x[b] = ROTATE(x[b] ^ x[c], 12); \
  x[a] += x[b]; x[d] = ROTATE(x[d] ^ x[a],  8); \
  x[c] += x[d]; x[b] = ROTATE(x[b] ^ x[c],  7);

ROTATE

#define ROTATE	(		v,
			n
	)		(((v) << (n)) | ((v) >> (32 - (n))))

U32TO8_LITTLE

#define U32TO8_LITTLE	(		p,
			v
	)

Value:

{                            \
    (p)[0] = (v >> 0) & 0xff;  \
    (p)[1] = (v >> 8) & 0xff;  \
    (p)[2] = (v >> 16) & 0xff; \
    (p)[3] = (v >> 24) & 0xff; \
  }

U8TO32_LITTLE

#define U8TO32_LITTLE

(

p

)

Value:

(((uint32_t)((p)[0])) | ((uint32_t)((p)[1]) << 8) | \
   ((uint32_t)((p)[2]) << 16) | ((uint32_t)((p)[3]) << 24))

Function Documentation

CRYPTO_chacha_20()

void CRYPTO_chacha_20	(	uint8_t *	out,
		const uint8_t *	in,
		size_t	in_len,
		const uint8_t	key[32],
		const uint8_t	nonce[12],
		uint32_t	counter
	)