+//
+// MD5 message-digest algorithm
+// Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved.
+//
+// C++/object oriented translation and modification:
+// Copyright (C) 1995 Mordechai T. Abzug
+//
+// Further adaptations for SuperTux:
+// Copyright (C) 2008 Christoph Sommer <christoph.sommer@2008.expires.deltadevelopment.de>
+//
+// This translation/modification is provided "as is," without express or
+// implied warranty of any kind.
+//
+// The translators/modifiers do not claim:
+// (1) that MD5 will do what you think it does;
+// (2) that this translation/ modification is accurate; or
+// (3) that this software is "merchantible."
+//
+// based on:
+//
+// MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
+// MDDRIVER.C - test driver for MD2, MD4 and MD5
+// 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.
+//
+
+#include "md5.hpp"
+
+#include <assert.h>
+#include <strings.h>
+#include <iostream>
+#include <stdexcept>
+
+MD5::MD5() {
+ init();
+}
+
+void MD5::update (uint8_t* input, uint32_t input_length) {
+
+ uint32_t input_index, buffer_index;
+ uint32_t buffer_space; // how much space is left in buffer
+
+ if (finalized) throw std::runtime_error("MD5::update: Can't update a finalized digest!");
+
+ // Compute number of bytes mod 64
+ buffer_index = (unsigned int)((count[0] >> 3) & 0x3F);
+
+ // Update number of bits
+ if ( (count[0] += ((uint32_t) input_length << 3))<((uint32_t) input_length << 3) ) count[1]++;
+
+ count[1] += ((uint32_t)input_length >> 29);
+
+
+ buffer_space = 64 - buffer_index; // how much space is left in buffer
+
+ // Transform as many times as possible.
+ if (input_length >= buffer_space) { // ie. we have enough to fill the buffer
+ // fill the rest of the buffer and transform
+ memcpy (buffer + buffer_index, input, buffer_space);
+ transform (buffer);
+
+ // now, transform each 64-byte piece of the input, bypassing the buffer
+ for (input_index = buffer_space; input_index + 63 < input_length;
+ input_index += 64)
+ transform (input+input_index);
+
+ buffer_index = 0; // so we can buffer remaining
+ } else
+ input_index=0; // so we can buffer the whole input
+
+
+ // and here we do the buffering:
+ memcpy(buffer+buffer_index, input+input_index, input_length-input_index);
+}
+
+void MD5::update(FILE *file) {
+ uint8_t buffer[1024];
+ int len;
+
+ while ((len=fread(buffer, 1, 1024, file))) update(buffer, len);
+
+ fclose (file);
+}
+
+void MD5::update(std::istream& stream) {
+ uint8_t buffer[1024];
+ int len;
+
+ while (stream.good()) {
+ stream.read((char*)buffer, 1024); // note that return value of read is unusable.
+ len=stream.gcount();
+ update(buffer, len);
+ }
+}
+
+void MD5::update(std::ifstream& stream) {
+ uint8_t buffer[1024];
+ int len;
+
+ while (stream.good()) {
+ stream.read((char*)buffer, 1024); // note that return value of read is unusable.
+ len=stream.gcount();
+ update(buffer, len);
+ }
+}
+
+
+MD5::MD5(FILE *file) {
+ init(); // must be called be all constructors
+ update(file);
+ finalize ();
+}
+
+MD5::MD5(std::istream& stream) {
+ init(); // must called by all constructors
+ update (stream);
+ finalize();
+}
+
+MD5::MD5(std::ifstream& stream) {
+ init(); // must called by all constructors
+ update (stream);
+ finalize();
+}
+
+uint8_t* MD5::raw_digest() {
+ uint8_t* s = new uint8_t[16];
+
+ finalize();
+
+ memcpy(s, digest, 16);
+ return s;
+}
+
+std::string MD5::hex_digest() {
+ int i;
+ char* s= new char[33];
+
+ finalize();
+
+ for (i=0; i<16; i++) sprintf(s+i*2, "%02x", digest[i]);
+
+ s[32]='\0';
+
+ return s;
+}
+
+std::ostream& operator<<(std::ostream &stream, MD5 context) {
+ stream << context.hex_digest();
+ return stream;
+}
+
+
+// PRIVATE METHODS:
+
+void MD5::init() {
+ finalized=false;
+
+ // Nothing counted, so count=0
+ count[0] = 0;
+ count[1] = 0;
+
+ // Load magic initialization constants.
+ state[0] = 0x67452301;
+ state[1] = 0xefcdab89;
+ state[2] = 0x98badcfe;
+ state[3] = 0x10325476;
+}
+
+void MD5::finalize() {
+ if (finalized) return;
+
+ uint8_t bits[8];
+ unsigned int index, padLen;
+ static uint8_t 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
+ };
+
+ // Save number of bits
+ encode (bits, count, 8);
+
+ // Pad out to 56 mod 64.
+ index = (uint32_t) ((count[0] >> 3) & 0x3f);
+ 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));
+
+ finalized=true;
+}
+
+// Constants for MD5Transform routine.
+// Although we could use C++ style constants, defines are actually better,
+// since they let us easily evade scope clashes.
+
+#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
+
+void MD5::transform (uint8_t block[64]) {
+ uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
+
+ decode (x, block, 64);
+
+ assert(!finalized); // not just a user error, since the method is private
+
+ /* 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, 0x02441453); /* 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, 0x04881d05); /* 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 ( (uint8_t* ) x, 0, sizeof(x));
+}
+
+void MD5::encode (uint8_t* output, uint32_t* input, uint32_t len) {
+ unsigned int i, j;
+
+ for (i = 0, j = 0; j < len; i++, j += 4) {
+ output[j] = (uint8_t) (input[i] & 0xff);
+ output[j+1] = (uint8_t) ((input[i] >> 8) & 0xff);
+ output[j+2] = (uint8_t) ((input[i] >> 16) & 0xff);
+ output[j+3] = (uint8_t) ((input[i] >> 24) & 0xff);
+ }
+}
+
+void MD5::decode (uint32_t* output, uint8_t* input, uint32_t len) {
+ unsigned int i, j;
+
+ for (i = 0, j = 0; j < len; i++, j += 4) {
+ output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) | (((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);
+ }
+}
+
+// Note: Replace "for loop" with standard memcpy if possible.
+void MD5::memcpy (uint8_t* output, uint8_t* input, uint32_t len) {
+ unsigned int i;
+
+ for (i = 0; i < len; i++) output[i] = input[i];
+}
+
+// Note: Replace "for loop" with standard memset if possible.
+void MD5::memset (uint8_t* output, uint8_t value, uint32_t len) {
+ unsigned int i;
+
+ for (i = 0; i < len; i++) output[i] = value;
+}
+
+inline unsigned int MD5::rotate_left(uint32_t x, uint32_t n) {
+ return (x << n) | (x >> (32-n));
+}
+
+inline unsigned int MD5::F(uint32_t x, uint32_t y, uint32_t z) {
+ return (x & y) | (~x & z);
+}
+
+inline unsigned int MD5::G(uint32_t x, uint32_t y, uint32_t z) {
+ return (x & z) | (y & ~z);
+}
+
+inline unsigned int MD5::H(uint32_t x, uint32_t y, uint32_t z) {
+ return x ^ y ^ z;
+}
+
+inline unsigned int MD5::I(uint32_t x, uint32_t y, uint32_t z) {
+ return y ^ (x | ~z);
+}
+
+inline void MD5::FF(uint32_t& a, uint32_t b, uint32_t c, uint32_t d, uint32_t x, uint32_t s, uint32_t ac) {
+ a += F(b, c, d) + x + ac;
+ a = rotate_left (a, s) +b;
+}
+
+inline void MD5::GG(uint32_t& a, uint32_t b, uint32_t c, uint32_t d, uint32_t x, uint32_t s, uint32_t ac) {
+ a += G(b, c, d) + x + ac;
+ a = rotate_left (a, s) +b;
+}
+
+inline void MD5::HH(uint32_t& a, uint32_t b, uint32_t c, uint32_t d, uint32_t x, uint32_t s, uint32_t ac) {
+ a += H(b, c, d) + x + ac;
+ a = rotate_left (a, s) +b;
+}
+
+inline void MD5::II(uint32_t& a, uint32_t b, uint32_t c, uint32_t d, uint32_t x, uint32_t s, uint32_t ac) {
+ a += I(b, c, d) + x + ac;
+ a = rotate_left (a, s) +b;
+}