sha512_256.c File Reference

Calculation of SHA-512/256 digest as defined in FIPS PUB 180-4 (2015). More...

#include "sha512_256.h"
#include <string.h>
#include "mhd_bithelpers.h"
#include "mhd_assert.h"

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Macros
#define	Ch(x, y, z)
#define	Maj(x, y, z)
#define	SIG0(x)
#define	SIG1(x)
#define	sig0(x)
#define	sig1(x)
#define	SHA2STEP64(vA, vB, vC, vD, vE, vF, vG, vH, kt, wt)
#define	GET_W_FROM_DATA(buf, t)
#define	Wgen(w, t)
#define	SHA512_256_SIZE_OF_LEN_ADD_BITS   128
#define	SHA512_256_SIZE_OF_LEN_ADD   (SHA512_256_SIZE_OF_LEN_ADD_BITS / 8)

Functions
void	MHD_SHA512_256_init (struct Sha512_256Ctx *ctx)
static MHD_DATA_TRUNCATION_RUNTIME_CHECK_DISABLE_ void	sha512_256_transform (uint64_t H[SHA512_256_HASH_SIZE_WORDS], const void *data)
void	MHD_SHA512_256_update (struct Sha512_256Ctx *ctx, const uint8_t *data, size_t length)
void	MHD_SHA512_256_finish (struct Sha512_256Ctx *ctx, uint8_t digest[SHA512_256_DIGEST_SIZE])

Detailed Description

Calculation of SHA-512/256 digest as defined in FIPS PUB 180-4 (2015).

Author

Karlson2k (Evgeny Grin)

Definition in file sha512_256.c.

Macro Definition Documentation

Ch

#define Ch	(		x,
			y,
			z )

Value:

( (z) ^ ((x) & ((y) ^ (z))) )

GET_W_FROM_DATA

#define GET_W_FROM_DATA	(		buf,
			t )

Value:

  _MHD_GET_64BIT_BE (((const uint64_t*) (buf)) + (t))

Maj

#define Maj	(		x,
			y,
			z )

Value:

( ((x) & (y)) ^ ((z) & ((x) ^ (y))) )

SHA2STEP64

#define SHA2STEP64	(		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)

Referenced by sha512_256_transform().

SHA512_256_SIZE_OF_LEN_ADD

#define SHA512_256_SIZE_OF_LEN_ADD   (SHA512_256_SIZE_OF_LEN_ADD_BITS / 8)

Size of "length" insertion in bytes.

Definition at line 530 of file sha512_256.c.

Referenced by MHD_SHA512_256_finish().

SHA512_256_SIZE_OF_LEN_ADD_BITS

#define SHA512_256_SIZE_OF_LEN_ADD_BITS   128

Size of "length" insertion in bits. See FIPS PUB 180-4 clause 5.1.2.

Definition at line 525 of file sha512_256.c.

SIG0

#define SIG0

(

x

)

Value:

  ( _MHD_ROTR64 ((x), 28) ^ _MHD_ROTR64 ((x), 34) ^ _MHD_ROTR64 ((x), 39) )

sig0

#define sig0

(

x

)

Value:

  ( _MHD_ROTR64 ((x), 1) ^ _MHD_ROTR64 ((x), 8) ^ ((x) >> 7) )

SIG1

#define SIG1

(

x

)

Value:

  ( _MHD_ROTR64 ((x), 14) ^ _MHD_ROTR64 ((x), 18) ^ _MHD_ROTR64 ((x), 41) )

sig1

#define sig1

(

x

)

Value:

  ( _MHD_ROTR64 ((x), 19) ^ _MHD_ROTR64 ((x), 61) ^ ((x) >> 6) )

Wgen

#define Wgen	(		w,
			t )

Value:

                    ( (w)[(t - 16) & 15] + sig1 ((w)[((t) - 2) & 15])   \
                    + (w)[((t) - 7) & 15] + sig0 ((w)[((t) - 15) & 15]) )

Function Documentation

MHD_SHA512_256_finish()

void MHD_SHA512_256_finish	(	struct Sha512_256Ctx *	ctx,
		uint8_t	digest[SHA512_256_DIGEST_SIZE] )

Finalise SHA-512/256 calculation, return digest.

Parameters

	ctx	the calculation context
[out]	digest	set to the hash, must be SHA512_256_DIGEST_SIZE bytes

< Number of processed bits

< Number of bytes in the context buffer

Definition at line 539 of file sha512_256.c.

References _MHD_PUT_64BIT_BE, _MHD_UINT64_ALIGN, Sha512_256Ctx::buffer, Sha512_256Ctx::count, Sha512_256Ctx::count_bits_hi, Sha512_256Ctx::H, SHA512_256_BLOCK_SIZE, SHA512_256_BLOCK_SIZE_WORDS, SHA512_256_BYTES_IN_WORD, SHA512_256_DIGEST_SIZE, SHA512_256_DIGEST_SIZE_WORDS, SHA512_256_SIZE_OF_LEN_ADD, and sha512_256_transform().

Referenced by digest_calc_hash().

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MHD_SHA512_256_init()

void MHD_SHA512_256_init

(

struct Sha512_256Ctx *

ctx

)

Initialise structure for SHA-512/256 calculation.

Parameters

ctx	the calculation context

Definition at line 41 of file sha512_256.c.

References Sha512_256Ctx::count, Sha512_256Ctx::count_bits_hi, and Sha512_256Ctx::H.

Referenced by digest_init_one_time(), and digest_reset().

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MHD_SHA512_256_update()

void MHD_SHA512_256_update	(	struct Sha512_256Ctx *	ctx,
		const uint8_t *	data,
		size_t	length )

Process portion of bytes.

Parameters

ctx	the calculation context
data	bytes to add to hash
length	number of bytes in data

< Number of bytes in the context buffer

< The high part to be moved to another variable

Definition at line 460 of file sha512_256.c.

References Sha512_256Ctx::buffer, Sha512_256Ctx::count, Sha512_256Ctx::count_bits_hi, data, Sha512_256Ctx::H, mhd_assert, NULL, SHA512_256_BLOCK_SIZE, and sha512_256_transform().

Referenced by digest_update().

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sha512_256_transform()

MHD_DATA_TRUNCATION_RUNTIME_CHECK_DISABLE_ void sha512_256_transform ( uint64_t H[SHA512_256_HASH_SIZE_WORDS], const void * data )

static

Base of SHA-512/256 transformation. Gets full 128 bytes block of data and updates hash values;

Parameters

H	hash values
data	the data buffer with SHA512_256_BLOCK_SIZE bytes block

Definition at line 70 of file sha512_256.c.

References _MHD_UINT64_ALIGN, data, GET_W_FROM_DATA, SHA2STEP64, SHA512_256_HASH_SIZE_WORDS, and Wgen.

Referenced by MHD_SHA512_256_finish(), and MHD_SHA512_256_update().

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