384 lines
12 KiB
C
384 lines
12 KiB
C
/*
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* Written by Aaron D. Gifford <me@aarongifford.com>
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*
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* Copyright 2000 Aaron D. Gifford. 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(S) 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(S) 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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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <inttypes.h>
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#include <libgen.h>
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#include <xbps_api.h>
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/*** SHA-256 Machine Architecture Definitions *****************/
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/*** SHA-256 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 REVERSAL MACROS *******************************************/
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#ifndef WORDS_BIGENDIAN
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#define REVERSE32(w,x) { \
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sha2_word32 tmp = (w); \
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tmp = (tmp >> 16) | (tmp << 16); \
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(x) = ((tmp & 0xff00ff00UL) >> 8) | ((tmp & 0x00ff00ffUL) << 8); \
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}
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#define REVERSE64(w,x) { \
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sha2_word64 tmp = (w); \
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tmp = (tmp >> 32) | (tmp << 32); \
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tmp = ((tmp & 0xff00ff00ff00ff00ULL) >> 8) | \
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((tmp & 0x00ff00ff00ff00ffULL) << 8); \
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(x) = ((tmp & 0xffff0000ffff0000ULL) >> 16) | \
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((tmp & 0x0000ffff0000ffffULL) << 16); \
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}
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#endif /* WORDS_BIGENDIAN */
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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-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-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-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-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-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-256: */
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static const sha2_word32 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 sha2_word32 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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/* Unrolled SHA-256 round macros: */
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#ifndef WORDS_BIGENDIAN
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#define ROUND256_0_TO_15(a,b,c,d,e,f,g,h) \
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REVERSE32(*data++, W256[j]); \
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T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + \
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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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#else /* WORDS__BIGENDIAN */
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#define ROUND256_0_TO_15(a,b,c,d,e,f,g,h) \
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T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + \
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K256[j] + (W256[j] = *data++); \
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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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#endif /* WORDS_BIGENDIAN */
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#define ROUND256(a,b,c,d,e,f,g,h) \
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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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static void SHA256_Final(uint8_t[SHA256_DIGEST_LENGTH], SHA256_CTX*);
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static void SHA256_Transform(SHA256_CTX*, const sha2_word32*);
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/*** SHA-256: *********************************************************/
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void SHA256_Init(SHA256_CTX* context)
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{
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if (context == (SHA256_CTX*)0) {
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return;
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}
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memcpy(context->state, sha256_initial_hash_value, SHA256_DIGEST_LENGTH);
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memset(context->buffer, 0, SHA256_BLOCK_LENGTH);
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context->bitcount = 0;
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}
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static void
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SHA256_Transform(SHA256_CTX* context, const sha2_word32* data)
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{
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sha2_word32 a, b, c, d, e, f, g, h, s0, s1;
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sha2_word32 T1, *W256;
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int j;
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W256 = (sha2_word32*)context->buffer;
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/* Initialize registers with the prev. intermediate value */
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a = context->state[0];
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b = context->state[1];
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c = context->state[2];
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d = context->state[3];
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e = context->state[4];
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f = context->state[5];
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g = context->state[6];
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h = context->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 to 64: */
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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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context->state[0] += a;
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context->state[1] += b;
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context->state[2] += c;
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context->state[3] += d;
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context->state[4] += e;
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context->state[5] += f;
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context->state[6] += g;
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context->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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void
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SHA256_Update(SHA256_CTX* context, const uint8_t *data, size_t len)
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{
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unsigned int freespace, usedspace;
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if (len == 0) {
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/* Calling with no data is valid - we do nothing */
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return;
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}
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/* Sanity check: */
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assert(context != NULL && data != NULL);
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usedspace = (context->bitcount >> 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 += freespace << 3;
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len -= freespace;
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data += freespace;
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SHA256_Transform(context,
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(sha2_word32*)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 += len << 3;
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/* Clean up: */
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usedspace = freespace = 0;
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return;
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}
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}
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while (len >= SHA256_BLOCK_LENGTH) {
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/* Process as many complete blocks as we can */
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SHA256_Transform(context, (const sha2_word32*)data);
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context->bitcount += SHA256_BLOCK_LENGTH << 3;
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len -= SHA256_BLOCK_LENGTH;
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data += SHA256_BLOCK_LENGTH;
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}
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if (len > 0) {
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/* There's left-overs, so save 'em */
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memcpy(context->buffer, data, len);
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context->bitcount += len << 3;
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}
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/* Clean up: */
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usedspace = freespace = 0;
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}
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static void
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SHA256_Final(sha2_byte digest[], SHA256_CTX* context)
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{
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sha2_word32 *d = (sha2_word32*)digest;
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unsigned int usedspace;
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/* Sanity check: */
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assert(context != NULL);
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/* If no digest buffer is passed, we don't bother doing this: */
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if (digest != (sha2_byte*)0) {
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usedspace = (context->bitcount >> 3) % SHA256_BLOCK_LENGTH;
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#ifndef WORDS_BIGENDIAN
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/* Convert FROM host byte order */
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REVERSE64(context->bitcount,context->bitcount);
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#endif
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if (usedspace > 0) {
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/* Begin padding with a 1 bit: */
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context->buffer[usedspace++] = 0x80;
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if (usedspace <= SHA256_SHORT_BLOCK_LENGTH) {
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/* Set-up for the last transform: */
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memset(&context->buffer[usedspace], 0,
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SHA256_SHORT_BLOCK_LENGTH - usedspace);
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} else {
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if (usedspace < SHA256_BLOCK_LENGTH) {
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memset(&context->buffer[usedspace], 0,
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SHA256_BLOCK_LENGTH - usedspace);
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}
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/* Do second-to-last transform: */
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SHA256_Transform(context,
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(sha2_word32*)context->buffer);
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/* And set-up for the last transform: */
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memset(context->buffer, 0,
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SHA256_SHORT_BLOCK_LENGTH);
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}
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} else {
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/* Set-up for the last transform: */
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memset(context->buffer, 0, SHA256_SHORT_BLOCK_LENGTH);
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/* Begin padding with a 1 bit: */
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*context->buffer = 0x80;
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}
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/* Set the bit count: */
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*(sha2_word64*)&context->buffer[SHA256_SHORT_BLOCK_LENGTH] =
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context->bitcount;
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/* Final transform: */
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SHA256_Transform(context, (sha2_word32*)context->buffer);
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#ifndef WORDS_BIGENDIAN
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{
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/* Convert TO host byte order */
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int j;
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for (j = 0; j < 8; j++) {
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REVERSE32(context->state[j],context->state[j]);
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*d++ = context->state[j];
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}
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}
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#else
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memcpy(d, context->state, SHA256_DIGEST_LENGTH);
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#endif
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}
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/* Clean up state data: */
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memset(context, 0, sizeof(SHA256_CTX));
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usedspace = 0;
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}
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/*
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* Constant used by SHA256/384/512_End() functions for converting the
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* digest to a readable hexadecimal character string:
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*/
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static const char sha2_hex_digits[] = "0123456789abcdef";
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char *
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SHA256_End(SHA256_CTX *ctx, uint8_t *buffer)
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{
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uint8_t digest[SHA256_DIGEST_LENGTH], *d = digest;
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uint8_t *ret;
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int i;
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/* Sanity check: */
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assert(ctx != NULL);
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if ((ret = buffer) != NULL) {
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SHA256_Final(digest, ctx);
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for (i = 0; i < SHA256_DIGEST_LENGTH; i++) {
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*buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
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*buffer++ = sha2_hex_digits[*d & 0x0f];
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d++;
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}
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*buffer = (char) 0;
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} else {
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(void)memset(ctx, 0, sizeof(SHA256_CTX));
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}
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(void)memset(digest, 0, SHA256_DIGEST_LENGTH);
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return (char *)ret;
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}
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