292 lines
7.9 KiB
C
292 lines
7.9 KiB
C
/*
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* sha256.c - Implementation of the Secure Hash Algorithm-256 (SHA-256).
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*
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* Implemented from the description on the NIST Web site:
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* http://csrc.nist.gov/cryptval/shs.html
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*
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* Copyright (C) 2002 Southern Storm Software, Pty Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "sha256.h"
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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/*
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* Some helper macros for processing 32-bit values, while
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* being careful about 32-bit vs 64-bit system differences.
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*/
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#if SIZEOF_LONG > 4
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#define TRUNCLONG(x) ((x) & IL_MAX_UINT32)
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#define ROTATE(x,n) (TRUNCLONG(((x) >> (n))) | ((x) << (32 - (n))))
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#define SHIFT(x,n) (TRUNCLONG(((x) >> (n))))
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#else
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#define TRUNCLONG(x) (x)
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#define ROTATE(x,n) (((x) >> (n)) | ((x) << (32 - (n))))
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#define SHIFT(x,n) ((x) >> (n))
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#endif
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/*
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* Helper macros used by the SHA-256 computation.
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*/
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#define CH(x,y,z) (((x) & (y)) ^ (TRUNCLONG(~(x)) & (z)))
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#define MAJ(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
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#define SUM0(x) (ROTATE((x), 2) ^ ROTATE((x), 13) ^ ROTATE((x), 22))
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#define SUM1(x) (ROTATE((x), 6) ^ ROTATE((x), 11) ^ ROTATE((x), 25))
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#define RHO0(x) (ROTATE((x), 7) ^ ROTATE((x), 18) ^ SHIFT((x), 3))
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#define RHO1(x) (ROTATE((x), 17) ^ ROTATE((x), 19) ^ SHIFT((x), 10))
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/*
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* Constants used in each of the SHA-256 rounds.
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*/
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static unsigned int const K[64] = {
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
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0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
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0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
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0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
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0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
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0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
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0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
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0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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};
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void SHA256Init(SHA256Context *sha)
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{
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sha->inputLen = 0;
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sha->A = 0x6a09e667;
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sha->B = 0xbb67ae85;
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sha->C = 0x3c6ef372;
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sha->D = 0xa54ff53a;
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sha->E = 0x510e527f;
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sha->F = 0x9b05688c;
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sha->G = 0x1f83d9ab;
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sha->H = 0x5be0cd19;
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sha->totalLen[0] = 0;
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sha->totalLen[1] = 0;
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}
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/*
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* Process a single block of input using the hash algorithm.
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*/
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static void ProcessBlock(SHA256Context *sha, const unsigned char *block)
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{
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unsigned int W[64];
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unsigned int a, b, c, d, e, f, g, h;
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unsigned int temp, temp2;
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int t;
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/* Unpack the block into 64 32-bit words */
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for(t = 0; t < 16; ++t)
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{
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W[t] = (((unsigned int)(block[t * 4 + 0])) << 24) |
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(((unsigned int)(block[t * 4 + 1])) << 16) |
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(((unsigned int)(block[t * 4 + 2])) << 8) |
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((unsigned int)(block[t * 4 + 3]));
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}
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for(t = 16; t < 64; ++t)
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{
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W[t] = TRUNCLONG(RHO1(W[t - 2]) + W[t - 7] +
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RHO0(W[t - 15]) + W[t - 16]);
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}
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/* Load the SHA-256 state into local variables */
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a = sha->A;
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b = sha->B;
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c = sha->C;
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d = sha->D;
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e = sha->E;
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f = sha->F;
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g = sha->G;
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h = sha->H;
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/* Perform 64 rounds of hash computations */
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for(t = 0; t < 64; ++t)
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{
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temp = TRUNCLONG(h + SUM1(e) + CH(e, f, g) + K[t] + W[t]);
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temp2 = TRUNCLONG(SUM0(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 = TRUNCLONG(d + temp);
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d = c;
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c = b;
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b = a;
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a = TRUNCLONG(temp + temp2);
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}
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/* Combine the previous SHA-256 state with the new state */
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sha->A = TRUNCLONG(sha->A + a);
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sha->B = TRUNCLONG(sha->B + b);
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sha->C = TRUNCLONG(sha->C + c);
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sha->D = TRUNCLONG(sha->D + d);
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sha->E = TRUNCLONG(sha->E + e);
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sha->F = TRUNCLONG(sha->F + f);
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sha->G = TRUNCLONG(sha->G + g);
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sha->H = TRUNCLONG(sha->H + h);
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/* Clear the temporary state */
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//ILMemZero(W, sizeof(unsigned int) * 64);
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memset(W, 0, sizeof(unsigned int) * 64);
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a = b = c = d = e = f = g = h = temp = temp2 = 0;
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}
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void SHA256Data(SHA256Context *sha, const void *buffer, unsigned long len)
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{
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unsigned long templen;
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/* Add to the total length of the input stream */
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//sha->totalLen += (unsigned long long)len;
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sha->totalLen[1] += len;
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if ((sha->totalLen[1] & 0xFFFFFFFF) < len)
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sha->totalLen[0]++;
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/* Copy the blocks into the input buffer and process them */
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while(len > 0)
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{
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if(!(sha->inputLen) && len >= 64)
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{
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/* Short cut: no point copying the data twice */
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ProcessBlock(sha, (const unsigned char *)buffer);
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buffer = (const void *)(((const unsigned char *)buffer) + 64);
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len -= 64;
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}
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else
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{
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templen = len;
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if(templen > (64 - sha->inputLen))
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{
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templen = 64 - sha->inputLen;
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}
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memcpy(sha->input + sha->inputLen, buffer, templen);
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if((sha->inputLen += templen) >= 64)
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{
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ProcessBlock(sha, sha->input);
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sha->inputLen = 0;
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}
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buffer = (const void *)(((const unsigned char *)buffer) + templen);
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len -= templen;
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}
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}
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}
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/*
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* Write a 32-bit big-endian long value to a buffer.
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*/
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static void WriteLong(unsigned char *buf, unsigned int value)
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{
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buf[0] = (unsigned char)(value >> 24);
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buf[1] = (unsigned char)(value >> 16);
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buf[2] = (unsigned char)(value >> 8);
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buf[3] = (unsigned char)value;
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}
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void SHA256Finalize(SHA256Context *sha,
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unsigned char hash[SHA256_HASH_SIZE])
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{
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//unsigned long long totalBits;
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unsigned long totalBits[2];
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/* Compute the final hash if necessary */
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if(hash)
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{
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/* Pad the input data to a multiple of 512 bits */
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if(sha->inputLen >= 56)
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{
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/* Need two blocks worth of padding */
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sha->input[(sha->inputLen)++] = (unsigned char)0x80;
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while(sha->inputLen < 64)
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{
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sha->input[(sha->inputLen)++] = (unsigned char)0x00;
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}
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ProcessBlock(sha, sha->input);
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sha->inputLen = 0;
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}
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else
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{
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/* Need one block worth of padding */
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sha->input[(sha->inputLen)++] = (unsigned char)0x80;
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}
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while(sha->inputLen < 56)
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{
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sha->input[(sha->inputLen)++] = (unsigned char)0x00;
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}
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//totalBits = (sha->totalLen << 3);
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//WriteLong(sha->input + 56, (unsigned int)(totalBits >> 32));
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//WriteLong(sha->input + 60, (unsigned int)totalBits);
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totalBits[0] = (sha->totalLen[0]<<3) | ( (sha->totalLen[1]>>29)&7 );
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totalBits[1] = sha->totalLen[1]<<3;
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WriteLong(sha->input+56, totalBits[0]);
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WriteLong(sha->input+60, totalBits[1]);
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ProcessBlock(sha, sha->input);
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/* Write the final hash value to the supplied buffer */
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WriteLong(hash, sha->A);
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WriteLong(hash + 4, sha->B);
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WriteLong(hash + 8, sha->C);
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WriteLong(hash + 12, sha->D);
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WriteLong(hash + 16, sha->E);
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WriteLong(hash + 20, sha->F);
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WriteLong(hash + 24, sha->G);
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WriteLong(hash + 28, sha->H);
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}
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/* Fill the entire context structure with zeros to blank it */
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memset(sha, 0, sizeof(SHA256Context));
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}
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int SHA256File(const char *path, unsigned char hash[SHA256_HASH_SIZE])
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{
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FILE *f;
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unsigned char buffer[16384];
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size_t readlen;
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SHA256Context ctx;
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f = fopen(path, "rb");
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if (f == NULL)
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return -1;
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SHA256Init(&ctx);
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for (;;) {
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readlen = fread(buffer, 1, sizeof(buffer), f);
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if (readlen == 0)
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break;
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SHA256Data(&ctx, buffer, readlen);
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}
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if (ferror(f) != 0) {
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int e = errno;
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fclose(f);
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errno = e;
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return -1;
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}
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if (fclose(f) != 0)
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return -1;
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SHA256Finalize(&ctx, hash);
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return 0;
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} |