273 lines
6.9 KiB
C++
273 lines
6.9 KiB
C++
/**
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* @file md5.cpp
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* @The implement of md5.
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* @author Jiewei Wei
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* @mail weijieweijerry@163.com
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* @github https://github.com/JieweiWei
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* @data Oct 19 2014
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*
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*/
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#include "md5.h"
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/* Define the static member of MD5. */
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const byte MD5::PADDING[64] = { 0x80 };
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const char MD5::HEX_NUMBERS[16] = {
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'0', '1', '2', '3',
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'4', '5', '6', '7',
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'8', '9', 'a', 'b',
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'c', 'd', 'e', 'f'
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};
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/**
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* @Construct a MD5 object with a string.
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*
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* @param {message} the message will be transformed.
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*
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*/
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MD5::MD5(const string& message) {
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finished = false;
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/* Reset number of bits. */
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count[0] = count[1] = 0;
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/* Initialization constants. */
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state[0] = 0x67452301;
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state[1] = 0xefcdab89;
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state[2] = 0x98badcfe;
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state[3] = 0x10325476;
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/* Initialization the object according to message. */
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init((const byte*)message.c_str(), message.length());
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}
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/**
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* @Generate md5 digest.
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*
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* @return the message-digest.
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*
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*/
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const byte* MD5::getDigest() {
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if (!finished) {
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finished = true;
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byte bits[8];
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bit32 oldState[4];
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bit32 oldCount[2];
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bit32 index, padLen;
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/* Save current state and count. */
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memcpy(oldState, state, 16);
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memcpy(oldCount, count, 8);
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/* Save number of bits */
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encode(count, bits, 8);
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/* Pad out to 56 mod 64. */
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index = (bit32)((count[0] >> 3) & 0x3f);
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padLen = (index < 56) ? (56 - index) : (120 - index);
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init(PADDING, padLen);
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/* Append length (before padding) */
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init(bits, 8);
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/* Store state in digest */
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encode(state, digest, 16);
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/* Restore current state and count. */
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memcpy(state, oldState, 16);
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memcpy(count, oldCount, 8);
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}
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return digest;
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}
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/**
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* @Initialization the md5 object, processing another message block,
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* and updating the context.
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*
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* @param {input} the input message.
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*
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* @param {len} the number btye of message.
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*
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*/
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void MD5::init(const byte* input, size_t len) {
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bit32 i, index, partLen;
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finished = false;
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/* Compute number of bytes mod 64 */
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index = (bit32)((count[0] >> 3) & 0x3f);
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/* update number of bits */
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if ((count[0] += ((bit32)len << 3)) < ((bit32)len << 3)) {
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++count[1];
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}
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count[1] += ((bit32)len >> 29);
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partLen = 64 - index;
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/* transform as many times as possible. */
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if (len >= partLen) {
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memcpy(&buffer[index], input, partLen);
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transform(buffer);
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for (i = partLen; i + 63 < len; i += 64) {
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transform(&input[i]);
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}
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index = 0;
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} else {
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i = 0;
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}
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/* Buffer remaining input */
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memcpy(&buffer[index], &input[i], len - i);
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}
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/**
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* @MD5 basic transformation. Transforms state based on block.
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*
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* @param {block} the message block.
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*/
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void MD5::transform(const byte block[64]) {
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bit32 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
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decode(block, x, 64);
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/* Round 1 */
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FF (a, b, c, d, x[ 0], s11, 0xd76aa478);
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FF (d, a, b, c, x[ 1], s12, 0xe8c7b756);
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FF (c, d, a, b, x[ 2], s13, 0x242070db);
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FF (b, c, d, a, x[ 3], s14, 0xc1bdceee);
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FF (a, b, c, d, x[ 4], s11, 0xf57c0faf);
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FF (d, a, b, c, x[ 5], s12, 0x4787c62a);
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FF (c, d, a, b, x[ 6], s13, 0xa8304613);
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FF (b, c, d, a, x[ 7], s14, 0xfd469501);
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FF (a, b, c, d, x[ 8], s11, 0x698098d8);
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FF (d, a, b, c, x[ 9], s12, 0x8b44f7af);
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FF (c, d, a, b, x[10], s13, 0xffff5bb1);
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FF (b, c, d, a, x[11], s14, 0x895cd7be);
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FF (a, b, c, d, x[12], s11, 0x6b901122);
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FF (d, a, b, c, x[13], s12, 0xfd987193);
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FF (c, d, a, b, x[14], s13, 0xa679438e);
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FF (b, c, d, a, x[15], s14, 0x49b40821);
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/* Round 2 */
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GG (a, b, c, d, x[ 1], s21, 0xf61e2562);
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GG (d, a, b, c, x[ 6], s22, 0xc040b340);
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GG (c, d, a, b, x[11], s23, 0x265e5a51);
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GG (b, c, d, a, x[ 0], s24, 0xe9b6c7aa);
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GG (a, b, c, d, x[ 5], s21, 0xd62f105d);
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GG (d, a, b, c, x[10], s22, 0x2441453);
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GG (c, d, a, b, x[15], s23, 0xd8a1e681);
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GG (b, c, d, a, x[ 4], s24, 0xe7d3fbc8);
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GG (a, b, c, d, x[ 9], s21, 0x21e1cde6);
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GG (d, a, b, c, x[14], s22, 0xc33707d6);
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GG (c, d, a, b, x[ 3], s23, 0xf4d50d87);
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GG (b, c, d, a, x[ 8], s24, 0x455a14ed);
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GG (a, b, c, d, x[13], s21, 0xa9e3e905);
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GG (d, a, b, c, x[ 2], s22, 0xfcefa3f8);
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GG (c, d, a, b, x[ 7], s23, 0x676f02d9);
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GG (b, c, d, a, x[12], s24, 0x8d2a4c8a);
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/* Round 3 */
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HH (a, b, c, d, x[ 5], s31, 0xfffa3942);
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HH (d, a, b, c, x[ 8], s32, 0x8771f681);
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HH (c, d, a, b, x[11], s33, 0x6d9d6122);
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HH (b, c, d, a, x[14], s34, 0xfde5380c);
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HH (a, b, c, d, x[ 1], s31, 0xa4beea44);
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HH (d, a, b, c, x[ 4], s32, 0x4bdecfa9);
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HH (c, d, a, b, x[ 7], s33, 0xf6bb4b60);
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HH (b, c, d, a, x[10], s34, 0xbebfbc70);
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HH (a, b, c, d, x[13], s31, 0x289b7ec6);
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HH (d, a, b, c, x[ 0], s32, 0xeaa127fa);
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HH (c, d, a, b, x[ 3], s33, 0xd4ef3085);
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HH (b, c, d, a, x[ 6], s34, 0x4881d05);
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HH (a, b, c, d, x[ 9], s31, 0xd9d4d039);
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HH (d, a, b, c, x[12], s32, 0xe6db99e5);
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HH (c, d, a, b, x[15], s33, 0x1fa27cf8);
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HH (b, c, d, a, x[ 2], s34, 0xc4ac5665);
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/* Round 4 */
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II (a, b, c, d, x[ 0], s41, 0xf4292244);
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II (d, a, b, c, x[ 7], s42, 0x432aff97);
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II (c, d, a, b, x[14], s43, 0xab9423a7);
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II (b, c, d, a, x[ 5], s44, 0xfc93a039);
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II (a, b, c, d, x[12], s41, 0x655b59c3);
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II (d, a, b, c, x[ 3], s42, 0x8f0ccc92);
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II (c, d, a, b, x[10], s43, 0xffeff47d);
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II (b, c, d, a, x[ 1], s44, 0x85845dd1);
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II (a, b, c, d, x[ 8], s41, 0x6fa87e4f);
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II (d, a, b, c, x[15], s42, 0xfe2ce6e0);
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II (c, d, a, b, x[ 6], s43, 0xa3014314);
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II (b, c, d, a, x[13], s44, 0x4e0811a1);
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II (a, b, c, d, x[ 4], s41, 0xf7537e82);
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II (d, a, b, c, x[11], s42, 0xbd3af235);
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II (c, d, a, b, x[ 2], s43, 0x2ad7d2bb);
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II (b, c, d, a, x[ 9], s44, 0xeb86d391);
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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}
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/**
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* @Encodes input (unsigned long) into output (byte).
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*
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* @param {input} usigned long.
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*
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* @param {output} byte.
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*
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* @param {length} the length of input.
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*
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*/
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void MD5::encode(const bit32* input, byte* output, size_t length) {
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for (size_t i = 0, j = 0; j < length; ++i, j += 4) {
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output[j]= (byte)(input[i] & 0xff);
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output[j + 1] = (byte)((input[i] >> 8) & 0xff);
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output[j + 2] = (byte)((input[i] >> 16) & 0xff);
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output[j + 3] = (byte)((input[i] >> 24) & 0xff);
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}
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}
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/**
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* @Decodes input (byte) into output (usigned long).
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*
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* @param {input} bytes.
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*
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* @param {output} unsigned long.
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*
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* @param {length} the length of input.
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*
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*/
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void MD5::decode(const byte* input, bit32* output, size_t length) {
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for (size_t i = 0, j = 0; j < length; ++i, j += 4) {
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output[i] = ((bit32)input[j]) | (((bit32)input[j + 1]) << 8) |
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(((bit32)input[j + 2]) << 16) | (((bit32)input[j + 3]) << 24);
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}
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}
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/**
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* @Convert digest to string value.
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*
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* @return the hex string of digest.
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*
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*/
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string MD5::toStr() {
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const byte* digest_ = getDigest();
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string str;
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str.reserve(16 << 1);
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for (size_t i = 0; i < 16; ++i) {
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int t = digest_[i];
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int a = t / 16;
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int b = t % 16;
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str.append(1, HEX_NUMBERS[a]);
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str.append(1, HEX_NUMBERS[b]);
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}
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return str;
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}
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