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authorTiger Wang <ziwei.tiger@hotmail.co.uk>2013-11-24 18:33:47 +0100
committerTiger Wang <ziwei.tiger@hotmail.co.uk>2013-11-24 18:33:47 +0100
commit16435995a55f142538228100d61d2445ce6bb851 (patch)
tree146e54fb811dfc922851b7dda4aac07e48b7c6f4 /src/md5/md5.cpp
parentRemoved old project files (diff)
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diff --git a/src/md5/md5.cpp b/src/md5/md5.cpp
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-/* MD5
- converted to C++ class by Frank Thilo (thilo@unix-ag.org)
- for bzflag (http://www.bzflag.org)
-
- based on:
-
- md5.h and md5.c
- reference implemantion of RFC 1321
-
- Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
-rights reserved.
-
-License to copy and use this software is granted provided that it
-is identified as the "RSA Data Security, Inc. MD5 Message-Digest
-Algorithm" in all material mentioning or referencing this software
-or this function.
-
-License is also granted to make and use derivative works provided
-that such works are identified as "derived from the RSA Data
-Security, Inc. MD5 Message-Digest Algorithm" in all material
-mentioning or referencing the derived work.
-
-RSA Data Security, Inc. makes no representations concerning either
-the merchantability of this software or the suitability of this
-software for any particular purpose. It is provided "as is"
-without express or implied warranty of any kind.
-
-These notices must be retained in any copies of any part of this
-documentation and/or software.
-
-*/
-
-/* interface header */
-#include "md5.h"
-
-/* system implementation headers */
-#include <stdio.h>
-
-#ifndef _WIN32
- #include <cstring>
-#endif
-
-
-
-
-
-// Constants for MD5Transform routine.
-#define S11 7
-#define S12 12
-#define S13 17
-#define S14 22
-#define S21 5
-#define S22 9
-#define S23 14
-#define S24 20
-#define S31 4
-#define S32 11
-#define S33 16
-#define S34 23
-#define S41 6
-#define S42 10
-#define S43 15
-#define S44 21
-
-///////////////////////////////////////////////
-
-// F, G, H and I are basic MD5 functions.
-inline MD5::uint4 MD5::F(uint4 x, uint4 y, uint4 z) {
- return x&y | ~x&z;
-}
-
-inline MD5::uint4 MD5::G(uint4 x, uint4 y, uint4 z) {
- return x&z | y&~z;
-}
-
-inline MD5::uint4 MD5::H(uint4 x, uint4 y, uint4 z) {
- return x^y^z;
-}
-
-inline MD5::uint4 MD5::I(uint4 x, uint4 y, uint4 z) {
- return y ^ (x | ~z);
-}
-
-// rotate_left rotates x left n bits.
-inline MD5::uint4 MD5::rotate_left(uint4 x, int n) {
- return (x << n) | (x >> (32-n));
-}
-
-// FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
-// Rotation is separate from addition to prevent recomputation.
-inline void MD5::FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
- a = rotate_left(a+ F(b,c,d) + x + ac, s) + b;
-}
-
-inline void MD5::GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
- a = rotate_left(a + G(b,c,d) + x + ac, s) + b;
-}
-
-inline void MD5::HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
- a = rotate_left(a + H(b,c,d) + x + ac, s) + b;
-}
-
-inline void MD5::II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
- a = rotate_left(a + I(b,c,d) + x + ac, s) + b;
-}
-
-//////////////////////////////////////////////
-
-// default ctor, just initailize
-MD5::MD5()
-{
- init();
-}
-
-//////////////////////////////////////////////
-
-// nifty shortcut ctor, compute MD5 for string and finalize it right away
-MD5::MD5(const std::string &text)
-{
- init();
- update(text.c_str(), text.length());
- finalize();
-}
-
-//////////////////////////////
-
-void MD5::init()
-{
- finalized=false;
-
- count[0] = 0;
- count[1] = 0;
-
- // load magic initialization constants.
- state[0] = 0x67452301;
- state[1] = 0xefcdab89;
- state[2] = 0x98badcfe;
- state[3] = 0x10325476;
-}
-
-//////////////////////////////
-
-// decodes input (unsigned char) into output (uint4). Assumes len is a multiple of 4.
-void MD5::decode(uint4 output[], const uint1 input[], size_type len)
-{
- for (unsigned int i = 0, j = 0; j < len; i++, j += 4)
- output[i] = ((uint4)input[j]) | (((uint4)input[j+1]) << 8) |
- (((uint4)input[j+2]) << 16) | (((uint4)input[j+3]) << 24);
-}
-
-//////////////////////////////
-
-// encodes input (uint4) into output (unsigned char). Assumes len is
-// a multiple of 4.
-void MD5::encode(uint1 output[], const uint4 input[], size_type len)
-{
- for (size_type i = 0, j = 0; j < len; i++, j += 4) {
- output[j] = input[i] & 0xff;
- output[j+1] = (input[i] >> 8) & 0xff;
- output[j+2] = (input[i] >> 16) & 0xff;
- output[j+3] = (input[i] >> 24) & 0xff;
- }
-}
-
-//////////////////////////////
-
-// apply MD5 algo on a block
-void MD5::transform(const uint1 block[blocksize])
-{
- uint4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
- decode (x, block, blocksize);
-
- /* Round 1 */
- FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
- FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
- FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
- FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
- FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
- FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
- FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
- FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
- FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
- FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
- FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
- FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
- FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
- FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
- FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
- FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
-
- /* Round 2 */
- GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
- GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
- GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
- GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
- GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
- GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
- GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
- GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
- GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
- GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
- GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
- GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
- GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
- GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
- GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
- GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
-
- /* Round 3 */
- HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
- HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
- HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
- HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
- HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
- HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
- HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
- HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
- HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
- HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
- HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
- HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
- HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
- HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
- HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
- HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
-
- /* Round 4 */
- II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
- II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
- II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
- II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
- II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
- II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
- II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
- II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
- II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
- II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
- II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
- II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
- II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
- II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
- II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
- II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
-
- state[0] += a;
- state[1] += b;
- state[2] += c;
- state[3] += d;
-
- // Zeroize sensitive information.
- memset(x, 0, sizeof x);
-}
-
-//////////////////////////////
-
-// MD5 block update operation. Continues an MD5 message-digest
-// operation, processing another message block
-void MD5::update(const unsigned char input[], size_type length)
-{
- // compute number of bytes mod 64
- size_type index = count[0] / 8 % blocksize;
-
- // Update number of bits
- if ((count[0] += (length << 3)) < (length << 3))
- count[1]++;
- count[1] += (length >> 29);
-
- // number of bytes we need to fill in buffer
- size_type firstpart = 64 - index;
-
- size_type i;
-
- // transform as many times as possible.
- if (length >= firstpart)
- {
- // fill buffer first, transform
- memcpy(&buffer[index], input, firstpart);
- transform(buffer);
-
- // transform chunks of blocksize (64 bytes)
- for (i = firstpart; i + blocksize <= length; i += blocksize)
- transform(&input[i]);
-
- index = 0;
- }
- else
- i = 0;
-
- // buffer remaining input
- memcpy(&buffer[index], &input[i], length-i);
-}
-
-//////////////////////////////
-
-// for convenience provide a verson with signed char
-void MD5::update(const char input[], size_type length)
-{
- update((const unsigned char*)input, length);
-}
-
-//////////////////////////////
-
-// MD5 finalization. Ends an MD5 message-digest operation, writing the
-// the message digest and zeroizing the context.
-MD5& MD5::finalize()
-{
- static unsigned char padding[64] = {
- 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
- };
-
- if (!finalized) {
- // Save number of bits
- unsigned char bits[8];
- encode(bits, count, 8);
-
- // pad out to 56 mod 64.
- size_type index = count[0] / 8 % 64;
- size_type padLen = (index < 56) ? (56 - index) : (120 - index);
- update(padding, padLen);
-
- // Append length (before padding)
- update(bits, 8);
-
- // Store state in digest
- encode(digest, state, 16);
-
- // Zeroize sensitive information.
- memset(buffer, 0, sizeof buffer);
- memset(count, 0, sizeof count);
-
- finalized=true;
- }
-
- return *this;
-}
-
-//////////////////////////////
-
-// return hex representation of digest as string
-std::string MD5::hexdigest() const
-{
- if (!finalized)
- return "";
-
- char buf[33];
- for (int i=0; i<16; i++)
- sprintf(buf+i*2, "%02x", digest[i]);
- buf[32]=0;
-
- return std::string(buf);
-}
-
-//////////////////////////////
-
-std::ostream& operator<<(std::ostream& out, MD5 md5)
-{
- return out << md5.hexdigest();
-}
-
-//////////////////////////////
-
-std::string md5(const std::string & str)
-{
- MD5 md5 = MD5(str);
-
- return md5.hexdigest();
-}