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