412 lines
13 KiB
C++
412 lines
13 KiB
C++
// //////////////////////////////////////////////////////////
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// sha256.cpp
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// Copyright (c) 2014,2015 Stephan Brumme. All rights reserved.
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// see http://create.stephan-brumme.com/disclaimer.html
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//
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#include "sha256.h"
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// big endian architectures need #define __BYTE_ORDER __BIG_ENDIAN
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#ifndef _MSC_VER
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//#include <endian.h>
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#endif
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/// same as reset()
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SHA256::SHA256()
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{
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reset();
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}
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/// restart
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void SHA256::reset()
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{
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m_numBytes = 0;
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m_bufferSize = 0;
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// according to RFC 1321
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m_hash[0] = 0x6a09e667;
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m_hash[1] = 0xbb67ae85;
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m_hash[2] = 0x3c6ef372;
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m_hash[3] = 0xa54ff53a;
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m_hash[4] = 0x510e527f;
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m_hash[5] = 0x9b05688c;
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m_hash[6] = 0x1f83d9ab;
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m_hash[7] = 0x5be0cd19;
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}
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namespace
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{
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inline uint32_t rotate(uint32_t a, uint32_t c)
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{
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return (a >> c) | (a << (32 - c));
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}
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inline uint32_t swap(uint32_t x)
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{
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#if defined(__GNUC__) || defined(__clang__)
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return __builtin_bswap32(x);
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#endif
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#ifdef MSC_VER
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return _byteswap_ulong(x);
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#endif
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return (x >> 24) |
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((x >> 8) & 0x0000FF00) |
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((x << 8) & 0x00FF0000) |
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(x << 24);
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}
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// mix functions for processBlock()
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inline uint32_t f1(uint32_t e, uint32_t f, uint32_t g)
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{
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uint32_t term1 = rotate(e, 6) ^ rotate(e, 11) ^ rotate(e, 25);
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uint32_t term2 = (e & f) ^ (~e & g); //(g ^ (e & (f ^ g)))
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return term1 + term2;
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}
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inline uint32_t f2(uint32_t a, uint32_t b, uint32_t c)
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{
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uint32_t term1 = rotate(a, 2) ^ rotate(a, 13) ^ rotate(a, 22);
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uint32_t term2 = ((a | b) & c) | (a & b); //(a & (b ^ c)) ^ (b & c);
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return term1 + term2;
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}
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}
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/// process 64 bytes
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void SHA256::processBlock(const void* data)
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{
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// get last hash
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uint32_t a = m_hash[0];
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uint32_t b = m_hash[1];
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uint32_t c = m_hash[2];
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uint32_t d = m_hash[3];
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uint32_t e = m_hash[4];
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uint32_t f = m_hash[5];
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uint32_t g = m_hash[6];
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uint32_t h = m_hash[7];
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// data represented as 16x 32-bit words
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const uint32_t* input = (uint32_t*) data;
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// convert to big endian
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uint32_t words[64];
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int i;
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for (i = 0; i < 16; i++)
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#if defined(__BYTE_ORDER) && (__BYTE_ORDER != 0) && (__BYTE_ORDER == __BIG_ENDIAN)
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words[i] = input[i];
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#else
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words[i] = swap(input[i]);
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#endif
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uint32_t x,y; // temporaries
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// first round
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x = h + f1(e,f,g) + 0x428a2f98 + words[ 0]; y = f2(a,b,c); d += x; h = x + y;
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x = g + f1(d,e,f) + 0x71374491 + words[ 1]; y = f2(h,a,b); c += x; g = x + y;
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x = f + f1(c,d,e) + 0xb5c0fbcf + words[ 2]; y = f2(g,h,a); b += x; f = x + y;
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x = e + f1(b,c,d) + 0xe9b5dba5 + words[ 3]; y = f2(f,g,h); a += x; e = x + y;
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x = d + f1(a,b,c) + 0x3956c25b + words[ 4]; y = f2(e,f,g); h += x; d = x + y;
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x = c + f1(h,a,b) + 0x59f111f1 + words[ 5]; y = f2(d,e,f); g += x; c = x + y;
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x = b + f1(g,h,a) + 0x923f82a4 + words[ 6]; y = f2(c,d,e); f += x; b = x + y;
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x = a + f1(f,g,h) + 0xab1c5ed5 + words[ 7]; y = f2(b,c,d); e += x; a = x + y;
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// secound round
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x = h + f1(e,f,g) + 0xd807aa98 + words[ 8]; y = f2(a,b,c); d += x; h = x + y;
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x = g + f1(d,e,f) + 0x12835b01 + words[ 9]; y = f2(h,a,b); c += x; g = x + y;
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x = f + f1(c,d,e) + 0x243185be + words[10]; y = f2(g,h,a); b += x; f = x + y;
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x = e + f1(b,c,d) + 0x550c7dc3 + words[11]; y = f2(f,g,h); a += x; e = x + y;
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x = d + f1(a,b,c) + 0x72be5d74 + words[12]; y = f2(e,f,g); h += x; d = x + y;
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x = c + f1(h,a,b) + 0x80deb1fe + words[13]; y = f2(d,e,f); g += x; c = x + y;
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x = b + f1(g,h,a) + 0x9bdc06a7 + words[14]; y = f2(c,d,e); f += x; b = x + y;
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x = a + f1(f,g,h) + 0xc19bf174 + words[15]; y = f2(b,c,d); e += x; a = x + y;
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// extend to 24 words
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for (; i < 24; i++)
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words[i] = words[i-16] +
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(rotate(words[i-15], 7) ^ rotate(words[i-15], 18) ^ (words[i-15] >> 3)) +
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words[i-7] +
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(rotate(words[i- 2], 17) ^ rotate(words[i- 2], 19) ^ (words[i- 2] >> 10));
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// third round
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x = h + f1(e,f,g) + 0xe49b69c1 + words[16]; y = f2(a,b,c); d += x; h = x + y;
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x = g + f1(d,e,f) + 0xefbe4786 + words[17]; y = f2(h,a,b); c += x; g = x + y;
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x = f + f1(c,d,e) + 0x0fc19dc6 + words[18]; y = f2(g,h,a); b += x; f = x + y;
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x = e + f1(b,c,d) + 0x240ca1cc + words[19]; y = f2(f,g,h); a += x; e = x + y;
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x = d + f1(a,b,c) + 0x2de92c6f + words[20]; y = f2(e,f,g); h += x; d = x + y;
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x = c + f1(h,a,b) + 0x4a7484aa + words[21]; y = f2(d,e,f); g += x; c = x + y;
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x = b + f1(g,h,a) + 0x5cb0a9dc + words[22]; y = f2(c,d,e); f += x; b = x + y;
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x = a + f1(f,g,h) + 0x76f988da + words[23]; y = f2(b,c,d); e += x; a = x + y;
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// extend to 32 words
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for (; i < 32; i++)
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words[i] = words[i-16] +
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(rotate(words[i-15], 7) ^ rotate(words[i-15], 18) ^ (words[i-15] >> 3)) +
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words[i-7] +
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(rotate(words[i- 2], 17) ^ rotate(words[i- 2], 19) ^ (words[i- 2] >> 10));
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// fourth round
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x = h + f1(e,f,g) + 0x983e5152 + words[24]; y = f2(a,b,c); d += x; h = x + y;
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x = g + f1(d,e,f) + 0xa831c66d + words[25]; y = f2(h,a,b); c += x; g = x + y;
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x = f + f1(c,d,e) + 0xb00327c8 + words[26]; y = f2(g,h,a); b += x; f = x + y;
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x = e + f1(b,c,d) + 0xbf597fc7 + words[27]; y = f2(f,g,h); a += x; e = x + y;
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x = d + f1(a,b,c) + 0xc6e00bf3 + words[28]; y = f2(e,f,g); h += x; d = x + y;
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x = c + f1(h,a,b) + 0xd5a79147 + words[29]; y = f2(d,e,f); g += x; c = x + y;
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x = b + f1(g,h,a) + 0x06ca6351 + words[30]; y = f2(c,d,e); f += x; b = x + y;
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x = a + f1(f,g,h) + 0x14292967 + words[31]; y = f2(b,c,d); e += x; a = x + y;
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// extend to 40 words
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for (; i < 40; i++)
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words[i] = words[i-16] +
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(rotate(words[i-15], 7) ^ rotate(words[i-15], 18) ^ (words[i-15] >> 3)) +
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words[i-7] +
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(rotate(words[i- 2], 17) ^ rotate(words[i- 2], 19) ^ (words[i- 2] >> 10));
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// fifth round
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x = h + f1(e,f,g) + 0x27b70a85 + words[32]; y = f2(a,b,c); d += x; h = x + y;
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x = g + f1(d,e,f) + 0x2e1b2138 + words[33]; y = f2(h,a,b); c += x; g = x + y;
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x = f + f1(c,d,e) + 0x4d2c6dfc + words[34]; y = f2(g,h,a); b += x; f = x + y;
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x = e + f1(b,c,d) + 0x53380d13 + words[35]; y = f2(f,g,h); a += x; e = x + y;
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x = d + f1(a,b,c) + 0x650a7354 + words[36]; y = f2(e,f,g); h += x; d = x + y;
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x = c + f1(h,a,b) + 0x766a0abb + words[37]; y = f2(d,e,f); g += x; c = x + y;
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x = b + f1(g,h,a) + 0x81c2c92e + words[38]; y = f2(c,d,e); f += x; b = x + y;
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x = a + f1(f,g,h) + 0x92722c85 + words[39]; y = f2(b,c,d); e += x; a = x + y;
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// extend to 48 words
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for (; i < 48; i++)
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words[i] = words[i-16] +
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(rotate(words[i-15], 7) ^ rotate(words[i-15], 18) ^ (words[i-15] >> 3)) +
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words[i-7] +
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(rotate(words[i- 2], 17) ^ rotate(words[i- 2], 19) ^ (words[i- 2] >> 10));
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// sixth round
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x = h + f1(e,f,g) + 0xa2bfe8a1 + words[40]; y = f2(a,b,c); d += x; h = x + y;
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x = g + f1(d,e,f) + 0xa81a664b + words[41]; y = f2(h,a,b); c += x; g = x + y;
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x = f + f1(c,d,e) + 0xc24b8b70 + words[42]; y = f2(g,h,a); b += x; f = x + y;
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x = e + f1(b,c,d) + 0xc76c51a3 + words[43]; y = f2(f,g,h); a += x; e = x + y;
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x = d + f1(a,b,c) + 0xd192e819 + words[44]; y = f2(e,f,g); h += x; d = x + y;
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x = c + f1(h,a,b) + 0xd6990624 + words[45]; y = f2(d,e,f); g += x; c = x + y;
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x = b + f1(g,h,a) + 0xf40e3585 + words[46]; y = f2(c,d,e); f += x; b = x + y;
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x = a + f1(f,g,h) + 0x106aa070 + words[47]; y = f2(b,c,d); e += x; a = x + y;
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// extend to 56 words
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for (; i < 56; i++)
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words[i] = words[i-16] +
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(rotate(words[i-15], 7) ^ rotate(words[i-15], 18) ^ (words[i-15] >> 3)) +
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words[i-7] +
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(rotate(words[i- 2], 17) ^ rotate(words[i- 2], 19) ^ (words[i- 2] >> 10));
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// seventh round
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x = h + f1(e,f,g) + 0x19a4c116 + words[48]; y = f2(a,b,c); d += x; h = x + y;
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x = g + f1(d,e,f) + 0x1e376c08 + words[49]; y = f2(h,a,b); c += x; g = x + y;
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x = f + f1(c,d,e) + 0x2748774c + words[50]; y = f2(g,h,a); b += x; f = x + y;
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x = e + f1(b,c,d) + 0x34b0bcb5 + words[51]; y = f2(f,g,h); a += x; e = x + y;
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x = d + f1(a,b,c) + 0x391c0cb3 + words[52]; y = f2(e,f,g); h += x; d = x + y;
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x = c + f1(h,a,b) + 0x4ed8aa4a + words[53]; y = f2(d,e,f); g += x; c = x + y;
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x = b + f1(g,h,a) + 0x5b9cca4f + words[54]; y = f2(c,d,e); f += x; b = x + y;
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x = a + f1(f,g,h) + 0x682e6ff3 + words[55]; y = f2(b,c,d); e += x; a = x + y;
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// extend to 64 words
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for (; i < 64; i++)
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words[i] = words[i-16] +
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(rotate(words[i-15], 7) ^ rotate(words[i-15], 18) ^ (words[i-15] >> 3)) +
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words[i-7] +
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(rotate(words[i- 2], 17) ^ rotate(words[i- 2], 19) ^ (words[i- 2] >> 10));
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// eigth round
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x = h + f1(e,f,g) + 0x748f82ee + words[56]; y = f2(a,b,c); d += x; h = x + y;
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x = g + f1(d,e,f) + 0x78a5636f + words[57]; y = f2(h,a,b); c += x; g = x + y;
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x = f + f1(c,d,e) + 0x84c87814 + words[58]; y = f2(g,h,a); b += x; f = x + y;
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x = e + f1(b,c,d) + 0x8cc70208 + words[59]; y = f2(f,g,h); a += x; e = x + y;
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x = d + f1(a,b,c) + 0x90befffa + words[60]; y = f2(e,f,g); h += x; d = x + y;
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x = c + f1(h,a,b) + 0xa4506ceb + words[61]; y = f2(d,e,f); g += x; c = x + y;
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x = b + f1(g,h,a) + 0xbef9a3f7 + words[62]; y = f2(c,d,e); f += x; b = x + y;
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x = a + f1(f,g,h) + 0xc67178f2 + words[63]; y = f2(b,c,d); e += x; a = x + y;
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// update hash
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m_hash[0] += a;
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m_hash[1] += b;
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m_hash[2] += c;
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m_hash[3] += d;
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m_hash[4] += e;
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m_hash[5] += f;
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m_hash[6] += g;
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m_hash[7] += h;
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}
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/// add arbitrary number of bytes
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void SHA256::add(const void* data, size_t numBytes)
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{
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const uint8_t* current = (const uint8_t*) data;
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if (m_bufferSize > 0)
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{
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while (numBytes > 0 && m_bufferSize < BlockSize)
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{
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m_buffer[m_bufferSize++] = *current++;
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numBytes--;
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}
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}
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// full buffer
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if (m_bufferSize == BlockSize)
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{
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processBlock(m_buffer);
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m_numBytes += BlockSize;
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m_bufferSize = 0;
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}
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// no more data ?
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if (numBytes == 0)
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return;
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// process full blocks
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while (numBytes >= BlockSize)
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{
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processBlock(current);
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current += BlockSize;
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m_numBytes += BlockSize;
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numBytes -= BlockSize;
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}
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// keep remaining bytes in buffer
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while (numBytes > 0)
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{
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m_buffer[m_bufferSize++] = *current++;
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numBytes--;
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}
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}
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/// process final block, less than 64 bytes
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void SHA256::processBuffer()
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{
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// the input bytes are considered as bits strings, where the first bit is the most significant bit of the byte
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// - append "1" bit to message
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// - append "0" bits until message length in bit mod 512 is 448
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// - append length as 64 bit integer
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// number of bits
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size_t paddedLength = m_bufferSize * 8;
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// plus one bit set to 1 (always appended)
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paddedLength++;
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// number of bits must be (numBits % 512) = 448
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size_t lower11Bits = paddedLength & 511;
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if (lower11Bits <= 448)
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paddedLength += 448 - lower11Bits;
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else
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paddedLength += 512 + 448 - lower11Bits;
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// convert from bits to bytes
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paddedLength /= 8;
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// only needed if additional data flows over into a second block
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unsigned char extra[BlockSize];
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// append a "1" bit, 128 => binary 10000000
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if (m_bufferSize < BlockSize)
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m_buffer[m_bufferSize] = 128;
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else
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extra[0] = 128;
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size_t i;
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for (i = m_bufferSize + 1; i < BlockSize; i++)
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m_buffer[i] = 0;
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for (; i < paddedLength; i++)
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extra[i - BlockSize] = 0;
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// add message length in bits as 64 bit number
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uint64_t msgBits = 8 * (m_numBytes + m_bufferSize);
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// find right position
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unsigned char* addLength;
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if (paddedLength < BlockSize)
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addLength = m_buffer + paddedLength;
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else
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addLength = extra + paddedLength - BlockSize;
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// must be big endian
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*addLength++ = (unsigned char)((msgBits >> 56) & 0xFF);
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*addLength++ = (unsigned char)((msgBits >> 48) & 0xFF);
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*addLength++ = (unsigned char)((msgBits >> 40) & 0xFF);
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*addLength++ = (unsigned char)((msgBits >> 32) & 0xFF);
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*addLength++ = (unsigned char)((msgBits >> 24) & 0xFF);
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*addLength++ = (unsigned char)((msgBits >> 16) & 0xFF);
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*addLength++ = (unsigned char)((msgBits >> 8) & 0xFF);
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*addLength = (unsigned char)( msgBits & 0xFF);
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// process blocks
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processBlock(m_buffer);
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// flowed over into a second block ?
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if (paddedLength > BlockSize)
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processBlock(extra);
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}
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/// return latest hash as 64 hex characters
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std::string SHA256::getHash()
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{
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// compute hash (as raw bytes)
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unsigned char rawHash[HashBytes];
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getHash(rawHash);
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// convert to hex string
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std::string result;
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result.reserve(2 * HashBytes);
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for (int i = 0; i < HashBytes; i++)
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{
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static const char dec2hex[16+1] = "0123456789abcdef";
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result += dec2hex[(rawHash[i] >> 4) & 15];
|
|
result += dec2hex[ rawHash[i] & 15];
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/// return latest hash as bytes
|
|
void SHA256::getHash(unsigned char buffer[SHA256::HashBytes])
|
|
{
|
|
// save old hash if buffer is partially filled
|
|
uint32_t oldHash[HashValues];
|
|
for (int i = 0; i < HashValues; i++)
|
|
oldHash[i] = m_hash[i];
|
|
|
|
// process remaining bytes
|
|
processBuffer();
|
|
|
|
unsigned char* current = buffer;
|
|
for (int i = 0; i < HashValues; i++)
|
|
{
|
|
*current++ = (m_hash[i] >> 24) & 0xFF;
|
|
*current++ = (m_hash[i] >> 16) & 0xFF;
|
|
*current++ = (m_hash[i] >> 8) & 0xFF;
|
|
*current++ = m_hash[i] & 0xFF;
|
|
|
|
// restore old hash
|
|
m_hash[i] = oldHash[i];
|
|
}
|
|
}
|
|
|
|
|
|
/// compute SHA256 of a memory block
|
|
std::string SHA256::operator()(const void* data, size_t numBytes)
|
|
{
|
|
reset();
|
|
add(data, numBytes);
|
|
return getHash();
|
|
}
|
|
|
|
|
|
/// compute SHA256 of a string, excluding final zero
|
|
std::string SHA256::operator()(const std::string& text)
|
|
{
|
|
reset();
|
|
add(text.c_str(), text.size());
|
|
return getHash();
|
|
}
|