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349 lines
9.9 KiB
C++
349 lines
9.9 KiB
C++
/* MD5
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converted to C++ class by Frank Thilo (thilo@unix-ag.org)
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for bzflag (http://www.bzflag.org)
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based on:
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md5.h and md5.c
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reference implemantion of RFC 1321
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Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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rights reserved.
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License to copy and use this software is granted provided that it
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is identified as the "RSA Data Security, Inc. MD5 Message-Digest
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Algorithm" in all material mentioning or referencing this software
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or this function.
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License is also granted to make and use derivative works provided
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that such works are identified as "derived from the RSA Data
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Security, Inc. MD5 Message-Digest Algorithm" in all material
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mentioning or referencing the derived work.
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RSA Data Security, Inc. makes no representations concerning either
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the merchantability of this software or the suitability of this
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software for any particular purpose. It is provided "as is"
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without express or implied warranty of any kind.
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These notices must be retained in any copies of any part of this
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documentation and/or software.
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*/
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/* interface header */
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#include "MD5.h"
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/* system implementation headers */
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#include <cstdio>
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// Constants for MD5Transform routine.
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#define S11 7
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#define S12 12
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#define S13 17
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#define S14 22
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#define S21 5
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#define S22 9
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#define S23 14
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#define S24 20
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#define S31 4
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#define S32 11
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#define S33 16
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#define S34 23
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#define S41 6
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#define S42 10
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#define S43 15
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#define S44 21
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///////////////////////////////////////////////
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// F, G, H and I are basic MD5 functions.
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inline MD5::uint4 MD5::F(uint4 x, uint4 y, uint4 z) {
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return x & y | ~x & z;
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}
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inline MD5::uint4 MD5::G(uint4 x, uint4 y, uint4 z) {
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return x & z | y & ~z;
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}
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inline MD5::uint4 MD5::H(uint4 x, uint4 y, uint4 z) {
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return x ^ y ^ z;
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}
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inline MD5::uint4 MD5::I(uint4 x, uint4 y, uint4 z) {
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return y ^ (x | ~z);
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}
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// rotate_left rotates x left n bits.
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inline MD5::uint4 MD5::rotate_left(uint4 x, int n) {
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return (x << n) | (x >> (32 - n));
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}
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// FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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// Rotation is separate from addition to prevent recomputation.
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inline void MD5::FF(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
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a = rotate_left(a + F(b, c, d) + x + ac, s) + b;
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}
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inline void MD5::GG(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
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a = rotate_left(a + G(b, c, d) + x + ac, s) + b;
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}
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inline void MD5::HH(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
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a = rotate_left(a + H(b, c, d) + x + ac, s) + b;
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}
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inline void MD5::II(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
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a = rotate_left(a + I(b, c, d) + x + ac, s) + b;
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}
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//////////////////////////////////////////////
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// default ctor, just initailize
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MD5::MD5() {
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init();
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}
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//////////////////////////////////////////////
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// nifty shortcut ctor, compute MD5 for string and finalize it right away
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MD5::MD5(const std::string& text) {
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init();
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update(text.c_str(), text.length());
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finalize();
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}
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//////////////////////////////
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void MD5::init() {
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finalized = false;
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count[0] = 0;
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count[1] = 0;
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// load magic 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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}
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//////////////////////////////
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// decodes input (unsigned char) into output (uint4). Assumes len is a multiple of 4.
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void MD5::decode(uint4 output[], const uint1 input[], size_type len) {
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for (unsigned int i = 0, j = 0; j < len; i++, j += 4)
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output[i] = ((uint4)input[j]) | (((uint4)input[j + 1]) << 8) |
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(((uint4)input[j + 2]) << 16) | (((uint4)input[j + 3]) << 24);
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}
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//////////////////////////////
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// encodes input (uint4) into output (unsigned char). Assumes len is
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// a multiple of 4.
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void MD5::encode(uint1 output[], const uint4 input[], size_type len) {
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for (size_type i = 0, j = 0; j < len; i++, j += 4) {
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output[j] = input[i] & 0xff;
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output[j + 1] = (input[i] >> 8) & 0xff;
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output[j + 2] = (input[i] >> 16) & 0xff;
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output[j + 3] = (input[i] >> 24) & 0xff;
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}
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}
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//////////////////////////////
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// apply MD5 algo on a block
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void MD5::transform(const uint1 block[blocksize]) {
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uint4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
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decode(x, block, blocksize);
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/* Round 1 */
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FF(a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
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FF(d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
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FF(c, d, a, b, x[2], S13, 0x242070db); /* 3 */
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FF(b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
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FF(a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
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FF(d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
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FF(c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
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FF(b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
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FF(a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
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FF(d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
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FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
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FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
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FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
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FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
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FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
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FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
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/* Round 2 */
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GG(a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
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GG(d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
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GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
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GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
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GG(a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
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GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */
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GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
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GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
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GG(a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
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GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
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GG(c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
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GG(b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
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GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
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GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
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GG(c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
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GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
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/* Round 3 */
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HH(a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
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HH(d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
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HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
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HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
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HH(a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
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HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
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HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
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HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
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HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
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HH(d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
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HH(c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
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HH(b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
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HH(a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
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HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
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HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
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HH(b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */
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/* Round 4 */
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II(a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
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II(d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
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II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
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II(b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
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II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
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II(d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
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II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
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II(b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
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II(a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
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II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
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II(c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
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II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
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II(a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
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II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
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II(c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
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II(b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */
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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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// Zeroize sensitive information.
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memset(x, 0, sizeof x);
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}
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//////////////////////////////
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// MD5 block update operation. Continues an MD5 message-digest
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// operation, processing another message block
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void MD5::update(const unsigned char input[], size_type length) {
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// compute number of bytes mod 64
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size_type index = count[0] / 8 % blocksize;
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// Update number of bits
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if ((count[0] += (length << 3)) < (length << 3))
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count[1]++;
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count[1] += (length >> 29);
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// number of bytes we need to fill in buffer
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size_type firstpart = 64 - index;
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size_type i;
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// transform as many times as possible.
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if (length >= firstpart) {
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// fill buffer first, transform
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memcpy(&buffer[index], input, firstpart);
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transform(buffer);
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// transform chunks of blocksize (64 bytes)
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for (i = firstpart; i + blocksize <= length; i += blocksize)
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transform(&input[i]);
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index = 0;
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} else
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i = 0;
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// buffer remaining input
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memcpy(&buffer[index], &input[i], length - i);
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}
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//////////////////////////////
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// for convenience provide a verson with signed char
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void MD5::update(const char input[], size_type length) {
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update((const unsigned char*)input, length);
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}
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//////////////////////////////
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// MD5 finalization. Ends an MD5 message-digest operation, writing the
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// the message digest and zeroizing the context.
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MD5& MD5::finalize() {
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static unsigned char padding[64] = {
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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if (!finalized) {
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// Save number of bits
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unsigned char bits[8];
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encode(bits, count, 8);
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// pad out to 56 mod 64.
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size_type index = count[0] / 8 % 64;
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size_type padLen = (index < 56) ? (56 - index) : (120 - index);
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update(padding, padLen);
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// Append length (before padding)
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update(bits, 8);
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// Store state in digest
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encode(digest, state, 16);
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// Zeroize sensitive information.
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memset(buffer, 0, sizeof buffer);
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memset(count, 0, sizeof count);
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finalized = true;
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}
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return *this;
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}
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//////////////////////////////
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// return hex representation of digest as string
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std::string MD5::hexdigest() const {
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if (!finalized)
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return "";
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char buf[33];
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for (int i = 0; i < 16; i++)
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sprintf(buf + i * 2, "%02x", digest[i]);
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buf[32] = 0;
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return std::string(buf);
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}
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//////////////////////////////
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std::ostream& operator<<(std::ostream& out, MD5 md5) {
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return out << md5.hexdigest();
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}
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//////////////////////////////
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std::string md5(const std::string str) {
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MD5 md5 = MD5(str);
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return md5.hexdigest();
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}
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