1 files changed, 366 insertions, 0 deletions

diff --git a/source/md5/md5.cpp b/source/md5/md5.cpp
new file mode 100644
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+++ b/source/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();

+}