sha256.c File Reference

SHA-256. More...

#include "check.h"

Macros
#define	rotr_32(num, amount)   ((num) >> (amount) | (num) << (32 - (amount)))
#define	blk0(i)   (W[i] = data[i])
#define	blk2(i)
#define	Ch(x, y, z)   (z ^ (x & (y ^ z)))
#define	Maj(x, y, z)   ((x & y) | (z & (x | y)))
#define	a(i)   T[(0 - i) & 7]
#define	b(i)   T[(1 - i) & 7]
#define	c(i)   T[(2 - i) & 7]
#define	d(i)   T[(3 - i) & 7]
#define	e(i)   T[(4 - i) & 7]
#define	f(i)   T[(5 - i) & 7]
#define	g(i)   T[(6 - i) & 7]
#define	h(i)   T[(7 - i) & 7]
#define	R(i)
#define	S0(x)   (rotr_32(x, 2) ^ rotr_32(x, 13) ^ rotr_32(x, 22))
#define	S1(x)   (rotr_32(x, 6) ^ rotr_32(x, 11) ^ rotr_32(x, 25))
#define	s0(x)   (rotr_32(x, 7) ^ rotr_32(x, 18) ^ (x >> 3))
#define	s1(x)   (rotr_32(x, 17) ^ rotr_32(x, 19) ^ (x >> 10))

Functions
static void	transform (uint32_t state[static 8], const uint32_t data[static 16])
static void	process (lzma_check_state *check)
void	lzma_sha256_init (lzma_check_state *check)
	Prepare SHA-256 state for new input.
void	lzma_sha256_update (const uint8_t *buf, size_t size, lzma_check_state *check)
	Update the SHA-256 hash state.
void	lzma_sha256_finish (lzma_check_state *check)
	Finish the SHA-256 calculation and store the result to check->buffer.u8.

Variables
static const uint32_t	SHA256_K [64]

Detailed Description

SHA-256.

Todo:

Crypto++ has x86 ASM optimizations. They use SSE so if they are imported to liblzma, SSE instructions need to be used conditionally to keep the code working on older boxes. We could also support using some external libary for SHA-256.

Macro Definition Documentation

#define blk2

(

i

)

Value:

(W[i & 15] += s1(W[(i - 2) & 15]) + W[(i - 7) & 15] \
                + s0(W[(i - 15) & 15]))

#define R

(

i

)

Value:

h(i) += S1(e(i)) + Ch(e(i), f(i), g(i)) + SHA256_K[i + j] \
                + (j ? blk2(i) : blk0(i)); \
        d(i) += h(i); \
        h(i) += S0(a(i)) + Maj(a(i), b(i), c(i))

Function Documentation

void lzma_sha256_init

(

lzma_check_state *

check

)

Prepare SHA-256 state for new input.

References lzma_sha256_state::size, lzma_sha256_state::state, and lzma_check_state::state.

Referenced by lzma_check_init().

void lzma_sha256_update	(	const uint8_t *	buf,
		size_t	size,
		lzma_check_state *	check
	)

Update the SHA-256 hash state.

References lzma_check_state::buffer, lzma_sha256_state::size, and lzma_check_state::state.

Referenced by lzma_check_update().

void lzma_sha256_finish

(

lzma_check_state *

check

)

Finish the SHA-256 calculation and store the result to check->buffer.u8.

References lzma_check_state::buffer, lzma_sha256_state::size, lzma_sha256_state::state, and lzma_check_state::state.

Referenced by lzma_check_finish().

Variable Documentation

const uint32_t SHA256_K[64]

static

Initial value:

 {
        0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
        0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
        0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
        0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
        0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
        0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
        0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
        0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
        0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
        0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
        0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
        0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
        0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
        0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
        0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
        0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2,
}