mirror of
https://github.com/LongSoft/UEFITool.git
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216 lines
7.7 KiB
C
216 lines
7.7 KiB
C
/* sha256.c
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Copyright (c) 2017, LongSoft. All rights reserved.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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*/
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#include "sha256.h"
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#include <stdint.h>
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#include <string.h>
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struct sha256_state {
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uint64_t length;
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uint32_t state[8], curlen;
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uint8_t buf[SHA256_DIGEST_SIZE*2];
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};
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void sha256_init(struct sha256_state *md);
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int sha256_process(struct sha256_state *md, const unsigned char *in, unsigned long inlen);
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int sha256_done(struct sha256_state *md, uint8_t *out);
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#define GET_BE32(a) ((((uint32_t) (a)[0]) << 24) | (((uint32_t) (a)[1]) << 16) | \
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(((uint32_t) (a)[2]) << 8) | ((uint32_t) (a)[3]))
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#define PUT_BE32(a, val) \
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do { \
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(a)[0] = (uint8_t) ((((uint32_t) (val)) >> 24) & 0xff); \
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(a)[1] = (uint8_t) ((((uint32_t) (val)) >> 16) & 0xff); \
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(a)[2] = (uint8_t) ((((uint32_t) (val)) >> 8) & 0xff); \
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(a)[3] = (uint8_t) (((uint32_t) (val)) & 0xff); \
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} while (0)
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#define PUT_BE64(a, val) \
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do { \
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(a)[0] = (uint8_t) (((uint64_t) (val)) >> 56); \
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(a)[1] = (uint8_t) (((uint64_t) (val)) >> 48); \
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(a)[2] = (uint8_t) (((uint64_t) (val)) >> 40); \
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(a)[3] = (uint8_t) (((uint64_t) (val)) >> 32); \
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(a)[4] = (uint8_t) (((uint64_t) (val)) >> 24); \
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(a)[5] = (uint8_t) (((uint64_t) (val)) >> 16); \
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(a)[6] = (uint8_t) (((uint64_t) (val)) >> 8); \
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(a)[7] = (uint8_t) (((uint64_t) (val)) & 0xff); \
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} while (0)
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void sha256(const void *in, unsigned long inlen, void* out)
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{
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struct sha256_state ctx;
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sha256_init(&ctx);
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sha256_process(&ctx, (const unsigned char*)in, inlen);
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sha256_done(&ctx, (unsigned char *)out);
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}
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/* This is based on SHA256 implementation in LibTomCrypt that was released into
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* public domain by Tom St Denis. */
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/* the K array */
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static const unsigned long K[64] = {
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0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL,
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0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL, 0xd807aa98UL, 0x12835b01UL,
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0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL,
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0xc19bf174UL, 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
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0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL, 0x983e5152UL,
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0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL,
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0x06ca6351UL, 0x14292967UL, 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL,
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0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
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0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL,
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0xd6990624UL, 0xf40e3585UL, 0x106aa070UL, 0x19a4c116UL, 0x1e376c08UL,
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0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL,
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0x682e6ff3UL, 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
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0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
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};
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/* Various logical functions */
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#define RORc(x, y) \
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( ((((unsigned long) (x) & 0xFFFFFFFFUL) >> (unsigned long) ((y) & 31)) | \
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((unsigned long) (x) << (unsigned long) (32 - ((y) & 31)))) & 0xFFFFFFFFUL)
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#define Ch(x,y,z) (z ^ (x & (y ^ z)))
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#define Maj(x,y,z) (((x | y) & z) | (x & y))
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#define S(x, n) RORc((x), (n))
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#define R(x, n) (((x)&0xFFFFFFFFUL)>>(n))
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#define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22))
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#define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25))
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#define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3))
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#define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10))
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#ifndef MIN
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#define MIN(x, y) (((x) < (y)) ? (x) : (y))
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#endif
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/* compress 512-bits */
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static int sha256_compress(struct sha256_state *md, unsigned char *buf)
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{
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uint32_t S[8], W[64], t0, t1;
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uint32_t t;
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int i;
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/* copy state into S */
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for (i = 0; i < 8; i++) {
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S[i] = md->state[i];
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}
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/* copy the state into 512-bits into W[0..15] */
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for (i = 0; i < 16; i++)
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W[i] = GET_BE32(buf + (4 * i));
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/* fill W[16..63] */
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for (i = 16; i < 64; i++) {
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W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) +
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W[i - 16];
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}
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/* Compress */
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#define RND(a,b,c,d,e,f,g,h,i) \
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t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \
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t1 = Sigma0(a) + Maj(a, b, c); \
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d += t0; \
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h = t0 + t1;
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for (i = 0; i < 64; ++i) {
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RND(S[0], S[1], S[2], S[3], S[4], S[5], S[6], S[7], i);
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t = S[7]; S[7] = S[6]; S[6] = S[5]; S[5] = S[4];
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S[4] = S[3]; S[3] = S[2]; S[2] = S[1]; S[1] = S[0]; S[0] = t;
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}
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/* feedback */
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for (i = 0; i < 8; i++) {
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md->state[i] = md->state[i] + S[i];
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}
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return 0;
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}
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/* Initialize the hash state */
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void sha256_init(struct sha256_state *md)
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{
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md->curlen = 0;
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md->length = 0;
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md->state[0] = 0x6A09E667UL;
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md->state[1] = 0xBB67AE85UL;
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md->state[2] = 0x3C6EF372UL;
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md->state[3] = 0xA54FF53AUL;
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md->state[4] = 0x510E527FUL;
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md->state[5] = 0x9B05688CUL;
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md->state[6] = 0x1F83D9ABUL;
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md->state[7] = 0x5BE0CD19UL;
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}
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/**
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Process a block of memory though the hash
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@param md The hash state
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@param in The data to hash
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@param inlen The length of the data (octets)
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@return CRYPT_OK if successful
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*/
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int sha256_process(struct sha256_state *md, const unsigned char *in,
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unsigned long inlen)
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{
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unsigned long n;
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#define block_size 64
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if (md->curlen > sizeof(md->buf))
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return -1;
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while (inlen > 0) {
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if (md->curlen == 0 && inlen >= block_size) {
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if (sha256_compress(md, (unsigned char *) in) < 0)
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return -1;
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md->length += block_size * 8;
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in += block_size;
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inlen -= block_size;
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} else {
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n = MIN(inlen, (block_size - md->curlen));
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memcpy(md->buf + md->curlen, in, n);
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md->curlen += n;
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in += n;
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inlen -= n;
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if (md->curlen == block_size) {
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if (sha256_compress(md, md->buf) < 0)
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return -1;
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md->length += 8 * block_size;
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md->curlen = 0;
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}
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}
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}
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return 0;
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}
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/**
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Terminate the hash to get the digest
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@param md The hash state
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@param out [out] The destination of the hash (32 bytes)
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@return CRYPT_OK if successful
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*/
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int sha256_done(struct sha256_state *md, unsigned char *out)
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{
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int i;
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if (md->curlen >= sizeof(md->buf))
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return -1;
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/* increase the length of the message */
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md->length += md->curlen * 8;
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/* append the '1' bit */
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md->buf[md->curlen++] = (unsigned char) 0x80;
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/* if the length is currently above 56 bytes we append zeros
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* then compress. Then we can fall back to padding zeros and length
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* encoding like normal.
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*/
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if (md->curlen > 56) {
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while (md->curlen < 64) {
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md->buf[md->curlen++] = (unsigned char) 0;
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}
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sha256_compress(md, md->buf);
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md->curlen = 0;
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}
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/* pad upto 56 bytes of zeroes */
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while (md->curlen < 56) {
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md->buf[md->curlen++] = (unsigned char) 0;
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}
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/* store length */
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PUT_BE64(md->buf + 56, md->length);
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sha256_compress(md, md->buf);
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/* copy output */
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for (i = 0; i < 8; i++)
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PUT_BE32(out + (4 * i), md->state[i]);
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return 0;
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}
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