381 lines
11 KiB
C++
381 lines
11 KiB
C++
// //////////////////////////////////////////////////////////
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// md5.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 "md5.h"
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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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MD5::MD5()
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{
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reset();
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}
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/// restart
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void MD5::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] = 0x67452301;
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m_hash[1] = 0xefcdab89;
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m_hash[2] = 0x98badcfe;
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m_hash[3] = 0x10325476;
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}
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namespace
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{
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// mix functions for processBlock()
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inline uint32_t f1(uint32_t b, uint32_t c, uint32_t d)
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{
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return d ^ (b & (c ^ d)); // original: f = (b & c) | ((~b) & d);
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}
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inline uint32_t f2(uint32_t b, uint32_t c, uint32_t d)
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{
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return c ^ (d & (b ^ c)); // original: f = (b & d) | (c & (~d));
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}
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inline uint32_t f3(uint32_t b, uint32_t c, uint32_t d)
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{
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return b ^ c ^ d;
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}
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inline uint32_t f4(uint32_t b, uint32_t c, uint32_t d)
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{
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return c ^ (b | ~d);
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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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#if defined(__BYTE_ORDER) && (__BYTE_ORDER != 0) && (__BYTE_ORDER == __BIG_ENDIAN)
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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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#endif
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}
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/// process 64 bytes
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void MD5::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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// data represented as 16x 32-bit words
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const uint32_t* words = (uint32_t*) data;
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// computations are little endian, swap data if necessary
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#if defined(__BYTE_ORDER) && (__BYTE_ORDER != 0) && (__BYTE_ORDER == __BIG_ENDIAN)
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#define LITTLEENDIAN(x) swap(x)
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#else
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#define LITTLEENDIAN(x) (x)
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#endif
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// first round
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uint32_t word0 = LITTLEENDIAN(words[ 0]);
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a = rotate(a + f1(b,c,d) + word0 + 0xd76aa478, 7) + b;
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uint32_t word1 = LITTLEENDIAN(words[ 1]);
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d = rotate(d + f1(a,b,c) + word1 + 0xe8c7b756, 12) + a;
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uint32_t word2 = LITTLEENDIAN(words[ 2]);
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c = rotate(c + f1(d,a,b) + word2 + 0x242070db, 17) + d;
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uint32_t word3 = LITTLEENDIAN(words[ 3]);
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b = rotate(b + f1(c,d,a) + word3 + 0xc1bdceee, 22) + c;
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uint32_t word4 = LITTLEENDIAN(words[ 4]);
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a = rotate(a + f1(b,c,d) + word4 + 0xf57c0faf, 7) + b;
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uint32_t word5 = LITTLEENDIAN(words[ 5]);
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d = rotate(d + f1(a,b,c) + word5 + 0x4787c62a, 12) + a;
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uint32_t word6 = LITTLEENDIAN(words[ 6]);
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c = rotate(c + f1(d,a,b) + word6 + 0xa8304613, 17) + d;
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uint32_t word7 = LITTLEENDIAN(words[ 7]);
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b = rotate(b + f1(c,d,a) + word7 + 0xfd469501, 22) + c;
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uint32_t word8 = LITTLEENDIAN(words[ 8]);
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a = rotate(a + f1(b,c,d) + word8 + 0x698098d8, 7) + b;
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uint32_t word9 = LITTLEENDIAN(words[ 9]);
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d = rotate(d + f1(a,b,c) + word9 + 0x8b44f7af, 12) + a;
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uint32_t word10 = LITTLEENDIAN(words[10]);
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c = rotate(c + f1(d,a,b) + word10 + 0xffff5bb1, 17) + d;
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uint32_t word11 = LITTLEENDIAN(words[11]);
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b = rotate(b + f1(c,d,a) + word11 + 0x895cd7be, 22) + c;
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uint32_t word12 = LITTLEENDIAN(words[12]);
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a = rotate(a + f1(b,c,d) + word12 + 0x6b901122, 7) + b;
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uint32_t word13 = LITTLEENDIAN(words[13]);
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d = rotate(d + f1(a,b,c) + word13 + 0xfd987193, 12) + a;
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uint32_t word14 = LITTLEENDIAN(words[14]);
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c = rotate(c + f1(d,a,b) + word14 + 0xa679438e, 17) + d;
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uint32_t word15 = LITTLEENDIAN(words[15]);
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b = rotate(b + f1(c,d,a) + word15 + 0x49b40821, 22) + c;
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// second round
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a = rotate(a + f2(b,c,d) + word1 + 0xf61e2562, 5) + b;
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d = rotate(d + f2(a,b,c) + word6 + 0xc040b340, 9) + a;
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c = rotate(c + f2(d,a,b) + word11 + 0x265e5a51, 14) + d;
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b = rotate(b + f2(c,d,a) + word0 + 0xe9b6c7aa, 20) + c;
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a = rotate(a + f2(b,c,d) + word5 + 0xd62f105d, 5) + b;
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d = rotate(d + f2(a,b,c) + word10 + 0x02441453, 9) + a;
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c = rotate(c + f2(d,a,b) + word15 + 0xd8a1e681, 14) + d;
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b = rotate(b + f2(c,d,a) + word4 + 0xe7d3fbc8, 20) + c;
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a = rotate(a + f2(b,c,d) + word9 + 0x21e1cde6, 5) + b;
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d = rotate(d + f2(a,b,c) + word14 + 0xc33707d6, 9) + a;
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c = rotate(c + f2(d,a,b) + word3 + 0xf4d50d87, 14) + d;
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b = rotate(b + f2(c,d,a) + word8 + 0x455a14ed, 20) + c;
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a = rotate(a + f2(b,c,d) + word13 + 0xa9e3e905, 5) + b;
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d = rotate(d + f2(a,b,c) + word2 + 0xfcefa3f8, 9) + a;
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c = rotate(c + f2(d,a,b) + word7 + 0x676f02d9, 14) + d;
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b = rotate(b + f2(c,d,a) + word12 + 0x8d2a4c8a, 20) + c;
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// third round
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a = rotate(a + f3(b,c,d) + word5 + 0xfffa3942, 4) + b;
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d = rotate(d + f3(a,b,c) + word8 + 0x8771f681, 11) + a;
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c = rotate(c + f3(d,a,b) + word11 + 0x6d9d6122, 16) + d;
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b = rotate(b + f3(c,d,a) + word14 + 0xfde5380c, 23) + c;
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a = rotate(a + f3(b,c,d) + word1 + 0xa4beea44, 4) + b;
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d = rotate(d + f3(a,b,c) + word4 + 0x4bdecfa9, 11) + a;
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c = rotate(c + f3(d,a,b) + word7 + 0xf6bb4b60, 16) + d;
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b = rotate(b + f3(c,d,a) + word10 + 0xbebfbc70, 23) + c;
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a = rotate(a + f3(b,c,d) + word13 + 0x289b7ec6, 4) + b;
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d = rotate(d + f3(a,b,c) + word0 + 0xeaa127fa, 11) + a;
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c = rotate(c + f3(d,a,b) + word3 + 0xd4ef3085, 16) + d;
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b = rotate(b + f3(c,d,a) + word6 + 0x04881d05, 23) + c;
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a = rotate(a + f3(b,c,d) + word9 + 0xd9d4d039, 4) + b;
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d = rotate(d + f3(a,b,c) + word12 + 0xe6db99e5, 11) + a;
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c = rotate(c + f3(d,a,b) + word15 + 0x1fa27cf8, 16) + d;
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b = rotate(b + f3(c,d,a) + word2 + 0xc4ac5665, 23) + c;
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// fourth round
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a = rotate(a + f4(b,c,d) + word0 + 0xf4292244, 6) + b;
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d = rotate(d + f4(a,b,c) + word7 + 0x432aff97, 10) + a;
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c = rotate(c + f4(d,a,b) + word14 + 0xab9423a7, 15) + d;
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b = rotate(b + f4(c,d,a) + word5 + 0xfc93a039, 21) + c;
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a = rotate(a + f4(b,c,d) + word12 + 0x655b59c3, 6) + b;
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d = rotate(d + f4(a,b,c) + word3 + 0x8f0ccc92, 10) + a;
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c = rotate(c + f4(d,a,b) + word10 + 0xffeff47d, 15) + d;
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b = rotate(b + f4(c,d,a) + word1 + 0x85845dd1, 21) + c;
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a = rotate(a + f4(b,c,d) + word8 + 0x6fa87e4f, 6) + b;
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d = rotate(d + f4(a,b,c) + word15 + 0xfe2ce6e0, 10) + a;
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c = rotate(c + f4(d,a,b) + word6 + 0xa3014314, 15) + d;
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b = rotate(b + f4(c,d,a) + word13 + 0x4e0811a1, 21) + c;
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a = rotate(a + f4(b,c,d) + word4 + 0xf7537e82, 6) + b;
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d = rotate(d + f4(a,b,c) + word11 + 0xbd3af235, 10) + a;
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c = rotate(c + f4(d,a,b) + word2 + 0x2ad7d2bb, 15) + d;
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b = rotate(b + f4(c,d,a) + word9 + 0xeb86d391, 21) + c;
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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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}
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/// add arbitrary number of bytes
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void MD5::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 MD5::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 little endian
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*addLength++ = msgBits & 0xFF; msgBits >>= 8;
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*addLength++ = msgBits & 0xFF; msgBits >>= 8;
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*addLength++ = msgBits & 0xFF; msgBits >>= 8;
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*addLength++ = msgBits & 0xFF; msgBits >>= 8;
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*addLength++ = msgBits & 0xFF; msgBits >>= 8;
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*addLength++ = msgBits & 0xFF; msgBits >>= 8;
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*addLength++ = msgBits & 0xFF; msgBits >>= 8;
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*addLength++ = 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 32 hex characters
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std::string MD5::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];
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result += dec2hex[ rawHash[i] & 15];
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}
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return result;
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}
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/// return latest hash as bytes
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void MD5::getHash(unsigned char buffer[MD5::HashBytes])
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{
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// save old hash if buffer is partially filled
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uint32_t oldHash[HashValues];
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for (int i = 0; i < HashValues; i++)
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oldHash[i] = m_hash[i];
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// process remaining bytes
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processBuffer();
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unsigned char* current = buffer;
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for (int i = 0; i < HashValues; i++)
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{
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*current++ = m_hash[i] & 0xFF;
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*current++ = (m_hash[i] >> 8) & 0xFF;
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*current++ = (m_hash[i] >> 16) & 0xFF;
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*current++ = (m_hash[i] >> 24) & 0xFF;
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// restore old hash
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m_hash[i] = oldHash[i];
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}
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}
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/// compute MD5 of a memory block
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std::string MD5::operator()(const void* data, size_t numBytes)
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{
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reset();
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add(data, numBytes);
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return getHash();
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}
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/// compute MD5 of a string, excluding final zero
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std::string MD5::operator()(const std::string& text)
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{
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reset();
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add(text.c_str(), text.size());
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return getHash();
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}
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