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sha2: add implementation of the sha256 digest algo
Add a minimal implementation of the SHA-256 digest algorithm. This implementation is pulled from the OpenBSD project, and [1] [2] were used as a base. [1] https://github.com/openbsd/src/blob/master/lib/libc/hash/sha2.c [2] https://github.com/openbsd/src/blob/master/include/sha2.h Signed-off-by: Igor Opaniuk <igor.opaniuk@oss.qualcomm.com>
This commit is contained in:
Igor Opaniuk
475
sha2.c
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475
sha2.c
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@@ -0,0 +1,475 @@
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/* $OpenBSD: sha2.c,v 1.28 2019/07/23 12:35:22 dtucker Exp $ */
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/*
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* FILE: sha2.c
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* AUTHOR: Aaron D. Gifford <me@aarongifford.com>
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*
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* Copyright (c) 2000-2001, Aaron D. Gifford
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTOR(S) BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $From: sha2.c,v 1.1 2001/11/08 00:01:51 adg Exp adg $
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*/
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#include <sys/types.h>
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#include <string.h>
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#include "sha2.h"
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/*
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* UNROLLED TRANSFORM LOOP NOTE:
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* You can define SHA2_UNROLL_TRANSFORM to use the unrolled transform
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* loop version for the hash transform rounds (defined using macros
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* later in this file). Either define on the command line, for example:
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*
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* cc -DSHA2_UNROLL_TRANSFORM -o sha2 sha2.c sha2prog.c
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*
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* or define below:
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*
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* #define SHA2_UNROLL_TRANSFORM
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*
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*/
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#ifndef SHA2_SMALL
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#if defined(__amd64__) || defined(__i386__)
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#define SHA2_UNROLL_TRANSFORM
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#endif
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#endif
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/*** SHA-224/256/384/512 Machine Architecture Definitions *****************/
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/*
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* BYTE_ORDER NOTE:
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*
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* Please make sure that your system defines BYTE_ORDER. If your
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* architecture is little-endian, make sure it also defines
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* LITTLE_ENDIAN and that the two (BYTE_ORDER and LITTLE_ENDIAN) are
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* equivalent.
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*
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* If your system does not define the above, then you can do so by
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* hand like this:
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*
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* #define LITTLE_ENDIAN 1234
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* #define BIG_ENDIAN 4321
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*
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* And for little-endian machines, add:
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*
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* #define BYTE_ORDER LITTLE_ENDIAN
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*
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* Or for big-endian machines:
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*
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* #define BYTE_ORDER BIG_ENDIAN
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*
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* The FreeBSD machine this was written on defines BYTE_ORDER
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* appropriately by including <sys/types.h> (which in turn includes
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* <machine/endian.h> where the appropriate definitions are actually
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* made).
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*/
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#if defined(__MINGW32__) || defined(__MINGW64__)
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#include <sys/param.h>
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#endif
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#if !defined(BYTE_ORDER) || (BYTE_ORDER != LITTLE_ENDIAN && BYTE_ORDER != BIG_ENDIAN)
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#error Define BYTE_ORDER to be equal to either LITTLE_ENDIAN or BIG_ENDIAN
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#endif
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/*** SHA-224/256/384/512 Various Length Definitions ***********************/
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/* NOTE: Most of these are in sha2.h */
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#define SHA256_SHORT_BLOCK_LENGTH (SHA256_BLOCK_LENGTH - 8)
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/*** ENDIAN SPECIFIC COPY MACROS **************************************/
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#define BE_8_TO_32(dst, cp) do { \
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(dst) = (uint32_t)(cp)[3] | ((uint32_t)(cp)[2] << 8) | \
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((uint32_t)(cp)[1] << 16) | ((uint32_t)(cp)[0] << 24); \
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} while(0)
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#define BE_8_TO_64(dst, cp) do { \
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(dst) = (uint64_t)(cp)[7] | ((uint64_t)(cp)[6] << 8) | \
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((uint64_t)(cp)[5] << 16) | ((uint64_t)(cp)[4] << 24) | \
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((uint64_t)(cp)[3] << 32) | ((uint64_t)(cp)[2] << 40) | \
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((uint64_t)(cp)[1] << 48) | ((uint64_t)(cp)[0] << 56); \
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} while (0)
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#define BE_64_TO_8(cp, src) do { \
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(cp)[0] = (src) >> 56; \
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(cp)[1] = (src) >> 48; \
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(cp)[2] = (src) >> 40; \
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(cp)[3] = (src) >> 32; \
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(cp)[4] = (src) >> 24; \
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(cp)[5] = (src) >> 16; \
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(cp)[6] = (src) >> 8; \
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(cp)[7] = (src); \
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} while (0)
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#define BE_32_TO_8(cp, src) do { \
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(cp)[0] = (src) >> 24; \
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(cp)[1] = (src) >> 16; \
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(cp)[2] = (src) >> 8; \
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(cp)[3] = (src); \
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} while (0)
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/*
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* Macro for incrementally adding the unsigned 64-bit integer n to the
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* unsigned 128-bit integer (represented using a two-element array of
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* 64-bit words):
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*/
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#define ADDINC128(w,n) do { \
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(w)[0] += (uint64_t)(n); \
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if ((w)[0] < (n)) { \
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(w)[1]++; \
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} \
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} while (0)
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/*** THE SIX LOGICAL FUNCTIONS ****************************************/
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/*
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* Bit shifting and rotation (used by the six SHA-XYZ logical functions:
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*
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* NOTE: The naming of R and S appears backwards here (R is a SHIFT and
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* S is a ROTATION) because the SHA-224/256/384/512 description document
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* (see http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf) uses this
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* same "backwards" definition.
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*/
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/* Shift-right (used in SHA-224, SHA-256, SHA-384, and SHA-512): */
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#define R(b,x) ((x) >> (b))
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/* 32-bit Rotate-right (used in SHA-224 and SHA-256): */
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#define S32(b,x) (((x) >> (b)) | ((x) << (32 - (b))))
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/* Two of six logical functions used in SHA-224, SHA-256, SHA-384, and SHA-512: */
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#define Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
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#define Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
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/* Four of six logical functions used in SHA-224 and SHA-256: */
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#define Sigma0_256(x) (S32(2, (x)) ^ S32(13, (x)) ^ S32(22, (x)))
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#define Sigma1_256(x) (S32(6, (x)) ^ S32(11, (x)) ^ S32(25, (x)))
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#define sigma0_256(x) (S32(7, (x)) ^ S32(18, (x)) ^ R(3 , (x)))
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#define sigma1_256(x) (S32(17, (x)) ^ S32(19, (x)) ^ R(10, (x)))
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/*** SHA-XYZ INITIAL HASH VALUES AND CONSTANTS ************************/
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/* Hash constant words K for SHA-224 and SHA-256: */
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static const uint32_t K256[64] = {
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0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
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0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
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0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,
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0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,
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0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
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0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,
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0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL,
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0xc6e00bf3UL, 0xd5a79147UL, 0x06ca6351UL, 0x14292967UL,
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0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL,
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0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
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0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL,
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0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,
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0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL,
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0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,
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0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
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0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
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};
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/* Initial hash value H for SHA-256: */
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static const uint32_t sha256_initial_hash_value[8] = {
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0x6a09e667UL,
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0xbb67ae85UL,
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0x3c6ef372UL,
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0xa54ff53aUL,
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0x510e527fUL,
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0x9b05688cUL,
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0x1f83d9abUL,
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0x5be0cd19UL
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};
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/*** SHA-256: *********************************************************/
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void
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SHA256Init(SHA2_CTX *context)
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{
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memcpy(context->state.st32, sha256_initial_hash_value,
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sizeof(sha256_initial_hash_value));
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memset(context->buffer, 0, sizeof(context->buffer));
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context->bitcount[0] = 0;
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}
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#ifdef SHA2_UNROLL_TRANSFORM
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/* Unrolled SHA-256 round macros: */
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#define ROUND256_0_TO_15(a,b,c,d,e,f,g,h) do { \
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BE_8_TO_32(W256[j], data); \
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data += 4; \
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T1 = (h) + Sigma1_256((e)) + Ch((e), (f), (g)) + K256[j] + W256[j]; \
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(d) += T1; \
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(h) = T1 + Sigma0_256((a)) + Maj((a), (b), (c)); \
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j++; \
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} while(0)
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#define ROUND256(a,b,c,d,e,f,g,h) do { \
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s0 = W256[(j+1)&0x0f]; \
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s0 = sigma0_256(s0); \
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s1 = W256[(j+14)&0x0f]; \
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s1 = sigma1_256(s1); \
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T1 = (h) + Sigma1_256((e)) + Ch((e), (f), (g)) + K256[j] + \
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(W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0); \
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(d) += T1; \
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(h) = T1 + Sigma0_256((a)) + Maj((a), (b), (c)); \
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j++; \
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} while(0)
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void
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SHA256Transform(uint32_t state[8], const uint8_t data[SHA256_BLOCK_LENGTH])
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{
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uint32_t a, b, c, d, e, f, g, h, s0, s1;
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uint32_t T1, W256[16];
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int j;
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/* Initialize registers with the prev. intermediate value */
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a = state[0];
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b = state[1];
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c = state[2];
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d = state[3];
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e = state[4];
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f = state[5];
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g = state[6];
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h = state[7];
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j = 0;
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do {
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/* Rounds 0 to 15 (unrolled): */
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ROUND256_0_TO_15(a,b,c,d,e,f,g,h);
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ROUND256_0_TO_15(h,a,b,c,d,e,f,g);
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ROUND256_0_TO_15(g,h,a,b,c,d,e,f);
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ROUND256_0_TO_15(f,g,h,a,b,c,d,e);
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ROUND256_0_TO_15(e,f,g,h,a,b,c,d);
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ROUND256_0_TO_15(d,e,f,g,h,a,b,c);
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ROUND256_0_TO_15(c,d,e,f,g,h,a,b);
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ROUND256_0_TO_15(b,c,d,e,f,g,h,a);
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} while (j < 16);
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/* Now for the remaining rounds up to 63: */
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do {
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ROUND256(a,b,c,d,e,f,g,h);
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ROUND256(h,a,b,c,d,e,f,g);
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ROUND256(g,h,a,b,c,d,e,f);
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ROUND256(f,g,h,a,b,c,d,e);
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ROUND256(e,f,g,h,a,b,c,d);
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ROUND256(d,e,f,g,h,a,b,c);
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ROUND256(c,d,e,f,g,h,a,b);
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ROUND256(b,c,d,e,f,g,h,a);
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} while (j < 64);
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/* Compute the current intermediate hash value */
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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state[4] += e;
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state[5] += f;
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state[6] += g;
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state[7] += h;
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/* Clean up */
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a = b = c = d = e = f = g = h = T1 = 0;
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}
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#else /* SHA2_UNROLL_TRANSFORM */
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void
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SHA256Transform(uint32_t state[8], const uint8_t data[SHA256_BLOCK_LENGTH])
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{
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uint32_t a, b, c, d, e, f, g, h, s0, s1;
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uint32_t T1, T2, W256[16];
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int j;
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/* Initialize registers with the prev. intermediate value */
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a = state[0];
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b = state[1];
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c = state[2];
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d = state[3];
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e = state[4];
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f = state[5];
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g = state[6];
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h = state[7];
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j = 0;
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do {
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BE_8_TO_32(W256[j], data);
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data += 4;
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/* Apply the SHA-256 compression function to update a..h */
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T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + W256[j];
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T2 = Sigma0_256(a) + Maj(a, b, c);
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h = g;
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g = f;
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f = e;
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e = d + T1;
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d = c;
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c = b;
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b = a;
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a = T1 + T2;
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j++;
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} while (j < 16);
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do {
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/* Part of the message block expansion: */
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s0 = W256[(j+1)&0x0f];
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s0 = sigma0_256(s0);
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s1 = W256[(j+14)&0x0f];
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s1 = sigma1_256(s1);
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/* Apply the SHA-256 compression function to update a..h */
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T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] +
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(W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0);
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T2 = Sigma0_256(a) + Maj(a, b, c);
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h = g;
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g = f;
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f = e;
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e = d + T1;
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d = c;
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c = b;
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b = a;
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a = T1 + T2;
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j++;
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} while (j < 64);
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/* Compute the current intermediate hash value */
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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state[4] += e;
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state[5] += f;
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state[6] += g;
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state[7] += h;
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/* Clean up */
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a = b = c = d = e = f = g = h = T1 = T2 = 0;
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}
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#endif /* SHA2_UNROLL_TRANSFORM */
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void
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SHA256Update(SHA2_CTX *context, const uint8_t *data, size_t len)
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{
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uint64_t freespace, usedspace;
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/* Calling with no data is valid (we do nothing) */
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if (len == 0)
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return;
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usedspace = (context->bitcount[0] >> 3) % SHA256_BLOCK_LENGTH;
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if (usedspace > 0) {
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/* Calculate how much free space is available in the buffer */
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freespace = SHA256_BLOCK_LENGTH - usedspace;
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if (len >= freespace) {
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/* Fill the buffer completely and process it */
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memcpy(&context->buffer[usedspace], data, freespace);
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context->bitcount[0] += freespace << 3;
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len -= freespace;
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data += freespace;
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SHA256Transform(context->state.st32, context->buffer);
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} else {
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/* The buffer is not yet full */
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memcpy(&context->buffer[usedspace], data, len);
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context->bitcount[0] += (uint64_t)len << 3;
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/* Clean up: */
|
||||
usedspace = freespace = 0;
|
||||
return;
|
||||
}
|
||||
}
|
||||
while (len >= SHA256_BLOCK_LENGTH) {
|
||||
/* Process as many complete blocks as we can */
|
||||
SHA256Transform(context->state.st32, data);
|
||||
context->bitcount[0] += SHA256_BLOCK_LENGTH << 3;
|
||||
len -= SHA256_BLOCK_LENGTH;
|
||||
data += SHA256_BLOCK_LENGTH;
|
||||
}
|
||||
if (len > 0) {
|
||||
/* There's left-overs, so save 'em */
|
||||
memcpy(context->buffer, data, len);
|
||||
context->bitcount[0] += len << 3;
|
||||
}
|
||||
/* Clean up: */
|
||||
usedspace = freespace = 0;
|
||||
}
|
||||
|
||||
void
|
||||
SHA256Pad(SHA2_CTX *context)
|
||||
{
|
||||
unsigned int usedspace;
|
||||
|
||||
usedspace = (context->bitcount[0] >> 3) % SHA256_BLOCK_LENGTH;
|
||||
if (usedspace > 0) {
|
||||
/* Begin padding with a 1 bit: */
|
||||
context->buffer[usedspace++] = 0x80;
|
||||
|
||||
if (usedspace <= SHA256_SHORT_BLOCK_LENGTH) {
|
||||
/* Set-up for the last transform: */
|
||||
memset(&context->buffer[usedspace], 0,
|
||||
SHA256_SHORT_BLOCK_LENGTH - usedspace);
|
||||
} else {
|
||||
if (usedspace < SHA256_BLOCK_LENGTH) {
|
||||
memset(&context->buffer[usedspace], 0,
|
||||
SHA256_BLOCK_LENGTH - usedspace);
|
||||
}
|
||||
/* Do second-to-last transform: */
|
||||
SHA256Transform(context->state.st32, context->buffer);
|
||||
|
||||
/* Prepare for last transform: */
|
||||
memset(context->buffer, 0, SHA256_SHORT_BLOCK_LENGTH);
|
||||
}
|
||||
} else {
|
||||
/* Set-up for the last transform: */
|
||||
memset(context->buffer, 0, SHA256_SHORT_BLOCK_LENGTH);
|
||||
|
||||
/* Begin padding with a 1 bit: */
|
||||
*context->buffer = 0x80;
|
||||
}
|
||||
/* Store the length of input data (in bits) in big endian format: */
|
||||
BE_64_TO_8(&context->buffer[SHA256_SHORT_BLOCK_LENGTH],
|
||||
context->bitcount[0]);
|
||||
|
||||
/* Final transform: */
|
||||
SHA256Transform(context->state.st32, context->buffer);
|
||||
|
||||
/* Clean up: */
|
||||
usedspace = 0;
|
||||
}
|
||||
|
||||
void
|
||||
SHA256Final(uint8_t digest[SHA256_DIGEST_LENGTH], SHA2_CTX *context)
|
||||
{
|
||||
SHA2_CTX *volatile const contextv = context;
|
||||
SHA256Pad(context);
|
||||
|
||||
#if BYTE_ORDER == LITTLE_ENDIAN
|
||||
int i;
|
||||
|
||||
/* Convert TO host byte order */
|
||||
for (i = 0; i < 8; i++)
|
||||
BE_32_TO_8(digest + i * 4, context->state.st32[i]);
|
||||
#else
|
||||
memcpy(digest, context->state.st32, SHA256_DIGEST_LENGTH);
|
||||
#endif
|
||||
memset(contextv, 0, sizeof(*contextv));
|
||||
}
|
||||
64
sha2.h
Normal file
64
sha2.h
Normal file
@@ -0,0 +1,64 @@
|
||||
/* $OpenBSD: sha2.h,v 1.10 2016/09/03 17:00:29 tedu Exp $ */
|
||||
|
||||
/*
|
||||
* FILE: sha2.h
|
||||
* AUTHOR: Aaron D. Gifford <me@aarongifford.com>
|
||||
*
|
||||
* Copyright (c) 2000-2001, Aaron D. Gifford
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. Neither the name of the copyright holder nor the names of contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTOR(S) BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* $From: sha2.h,v 1.1 2001/11/08 00:02:01 adg Exp adg $
|
||||
*/
|
||||
|
||||
#ifndef __SHA2_H__
|
||||
#define __SHA2_H__
|
||||
|
||||
#include "stdint.h"
|
||||
|
||||
/*** SHA-256/384/512 Various Length Definitions ***********************/
|
||||
#define SHA256_BLOCK_LENGTH 64
|
||||
#define SHA256_DIGEST_LENGTH 32
|
||||
#define SHA256_DIGEST_STRING_LENGTH (SHA256_DIGEST_LENGTH * 2 + 1)
|
||||
|
||||
/*** SHA-224/256/384/512 Context Structure *******************************/
|
||||
typedef struct _SHA2_CTX {
|
||||
union {
|
||||
uint32_t st32[8];
|
||||
uint64_t st64[8];
|
||||
} state;
|
||||
uint64_t bitcount[2];
|
||||
uint8_t buffer[SHA256_BLOCK_LENGTH];
|
||||
} SHA2_CTX;
|
||||
|
||||
void SHA256Init(SHA2_CTX *);
|
||||
void SHA256Transform(uint32_t state[8], const uint8_t [SHA256_BLOCK_LENGTH]);
|
||||
void SHA256Update(SHA2_CTX *, const uint8_t *, size_t);
|
||||
void SHA256Pad(SHA2_CTX *);
|
||||
void SHA256Final(uint8_t [SHA256_DIGEST_LENGTH], SHA2_CTX *);
|
||||
char *SHA256End(SHA2_CTX *, char *);
|
||||
|
||||
#endif /* __SHA2_H__ */
|
||||
Reference in New Issue
Block a user