src/liblzma/check/sha256.c File Reference

SHA256. More...

#include "check.h"
#include "../../common/bswap.h"

Defines

#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

SHA256.


Define Documentation

#define rotr_32 ( num,
amount   )     ((num) >> (amount) | (num) << (32 - (amount)))
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.
#define blk2 (  ) 
Value:
(W[i & 15] += s1(W[(i - 2) & 15]) + W[(i - 7) & 15] \
                + s0(W[(i - 15) & 15]))
#define R (  ) 
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_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, 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, 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,
}

Generated on Tue Oct 6 14:02:22 2009 for XZ Utils by  doxygen 1.6.1