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sha256.c File Reference

Calculation of SHA-256 digest as defined in FIPS PUB 180-4 (2015) More...

#include "sha256.h"
#include <string.h>
#include "mhd_bithelpers.h"
#include "mhd_assert.h"
Include dependency graph for sha256.c:

Go to the source code of this file.

Macros

#define Ch(x, y, z)   ( (z) ^ ((x) & ((y) ^ (z))) )
 
#define Maj(x, y, z)   ( ((x) & (y)) ^ ((z) & ((x) ^ (y))) )
 
#define SIG0(x)
 
#define SIG1(x)
 
#define sig0(x)
 
#define sig1(x)
 
#define SHA2STEP32(vA, vB, vC, vD, vE, vF, vG, vH, kt, wt)
 
#define GET_W_FROM_DATA(buf, t)    _MHD_GET_32BIT_BE (((const uint8_t*) (buf)) + (t) * SHA256_BYTES_IN_WORD)
 
#define Wgen(w, t)
 
#define SHA256_SIZE_OF_LEN_ADD   (64 / 8)
 

Functions

void MHD_SHA256_init (void *ctx_)
 
static void sha256_transform (uint32_t H[_SHA256_DIGEST_LENGTH], const uint8_t data[SHA256_BLOCK_SIZE])
 
void MHD_SHA256_update (void *ctx_, const uint8_t *data, size_t length)
 
void MHD_SHA256_finish (void *ctx_, uint8_t digest[SHA256_DIGEST_SIZE])
 

Detailed Description

Calculation of SHA-256 digest as defined in FIPS PUB 180-4 (2015)

Author
Karlson2k (Evgeny Grin)

Definition in file sha256.c.

Macro Definition Documentation

◆ Ch

#define Ch (   x,
  y,
 
)    ( (z) ^ ((x) & ((y) ^ (z))) )

◆ GET_W_FROM_DATA

#define GET_W_FROM_DATA (   buf,
 
)     _MHD_GET_32BIT_BE (((const uint8_t*) (buf)) + (t) * SHA256_BYTES_IN_WORD)

◆ Maj

#define Maj (   x,
  y,
 
)    ( ((x) & (y)) ^ ((z) & ((x) ^ (y))) )

◆ SHA256_SIZE_OF_LEN_ADD

#define SHA256_SIZE_OF_LEN_ADD   (64 / 8)

Size of "length" padding addition in bytes. See FIPS PUB 180-4 paragraph 5.1.1.

Definition at line 364 of file sha256.c.

◆ SHA2STEP32

#define SHA2STEP32 (   vA,
  vB,
  vC,
  vD,
  vE,
  vF,
  vG,
  vH,
  kt,
  wt 
)
Value:
do { \
(vD) += ((vH) += SIG1 ((vE)) + Ch ((vE),(vF),(vG)) + (kt) + (wt)); \
(vH) += SIG0 ((vA)) + Maj ((vA),(vB),(vC)); } while (0)
#define SIG0(x)
#define Maj(x, y, z)
#define SIG1(x)
#define Ch(x, y, z)

◆ SIG0

#define SIG0 (   x)
Value:
(_MHD_ROTR32 ((x), 2) ^ _MHD_ROTR32 ((x), 13) ^ \
_MHD_ROTR32 ((x), 22) )
_MHD_static_inline uint32_t _MHD_ROTR32(uint32_t value32, int bits)

◆ sig0

#define sig0 (   x)
Value:
(_MHD_ROTR32 ((x), 7) ^ _MHD_ROTR32 ((x), 18) ^ \
((x) >> 3) )

◆ SIG1

#define SIG1 (   x)
Value:
(_MHD_ROTR32 ((x), 6) ^ _MHD_ROTR32 ((x), 11) ^ \
_MHD_ROTR32 ((x), 25) )

◆ sig1

#define sig1 (   x)
Value:
(_MHD_ROTR32 ((x), 17) ^ _MHD_ROTR32 ((x),19) ^ \
((x) >> 10) )

◆ Wgen

#define Wgen (   w,
 
)
Value:
( (w)[(t - 16) & 0xf] + sig1 ((w)[((t) - 2) & 0xf]) \
+ (w)[((t) - 7) & 0xf] + sig0 ((w)[((t) - 15) & 0xf]) )
#define sig1(x)
#define sig0(x)

Function Documentation

◆ MHD_SHA256_finish()

void MHD_SHA256_finish ( void *  ctx_,
uint8_t  digest[SHA256_DIGEST_SIZE] 
)

Finalise SHA256 calculation, return digest.

Parameters
ctx_must be a struct sha256_ctx *
[out]digestset to the hash, must be SHA256_DIGEST_SIZE bytes

< Number of processed bits

< Number of bytes in buffer

Definition at line 373 of file sha256.c.

References _MHD_PUT_32BIT_BE, _MHD_PUT_64BIT_BE_SAFE(), _MHD_UINT32_ALIGN, _SHA256_DIGEST_LENGTH, sha256_ctx::buffer, sha256_ctx::count, sha256_ctx::H, SHA256_BLOCK_SIZE, SHA256_BYTES_IN_WORD, SHA256_DIGEST_SIZE, SHA256_SIZE_OF_LEN_ADD, and sha256_transform().

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◆ MHD_SHA256_init()

void MHD_SHA256_init ( void *  ctx_)

Initialise structure for SHA256 calculation.

Parameters
ctx_must be a struct sha256_ctx *

Definition at line 41 of file sha256.c.

References sha256_ctx::count, and sha256_ctx::H.

◆ MHD_SHA256_update()

void MHD_SHA256_update ( void *  ctx_,
const uint8_t *  data,
size_t  length 
)

Process portion of bytes.

Parameters
ctx_must be a struct sha256_ctx *
databytes to add to hash
lengthnumber of bytes in data

< Number of bytes in buffer

Definition at line 311 of file sha256.c.

References sha256_ctx::buffer, sha256_ctx::count, data, sha256_ctx::H, mhd_assert, NULL, SHA256_BLOCK_SIZE, and sha256_transform().

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◆ sha256_transform()

static void sha256_transform ( uint32_t  H[_SHA256_DIGEST_LENGTH],
const uint8_t  data[SHA256_BLOCK_SIZE] 
)
static

Base of SHA-256 transformation. Gets full 64 bytes block of data and updates hash values;

Parameters
Hhash values
datadata, must be exactly 64 bytes long

Definition at line 69 of file sha256.c.

References _MHD_UINT32_ALIGN, data, GET_W_FROM_DATA, sha256_ctx::H, SHA256_BLOCK_SIZE, SHA2STEP32, and Wgen.

Referenced by MHD_SHA256_finish(), and MHD_SHA256_update().

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