#ifndef MD5_H
#define MD5_H

#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

#define FF(a, b, c, d, x, s, ac) \
  {(a) += F ((b), (c), (d)) + (x) + (ac); \
   (a) = ROTL32 ((a), (s)); \
   (a) += (b); \
  }
#define GG(a, b, c, d, x, s, ac) \
  {(a) += G ((b), (c), (d)) + (x) + (ac); \
   (a) = ROTL32 ((a), (s)); \
   (a) += (b); \
  }
#define HH(a, b, c, d, x, s, ac) \
  {(a) += H ((b), (c), (d)) + (x) + (ac); \
   (a) = ROTL32 ((a), (s)); \
   (a) += (b); \
  }
#define II(a, b, c, d, x, s, ac) \
  {(a) += I ((b), (c), (d)) + (x) + (ac); \
   (a) = ROTL32 ((a), (s)); \
   (a) += (b); \
  }

#define MAGIC_A 0x67452301
#define MAGIC_B 0xefcdab89
#define MAGIC_C 0x98badcfe
#define MAGIC_D 0x10325476

static void md5_64H (uint block[16], uint digest[4])
{
  uint a = digest[0];
  uint b = digest[1];
  uint c = digest[2];
  uint d = digest[3];

  #define S11 7
  #define S12 12
  #define S13 17
  #define S14 22

  FF ( a, b, c, d, block[ 0], S11, 0xd76aa478);
  FF ( d, a, b, c, block[ 1], S12, 0xe8c7b756);
  FF ( c, d, a, b, block[ 2], S13, 0x242070db);
  FF ( b, c, d, a, block[ 3], S14, 0xc1bdceee);
  FF ( a, b, c, d, block[ 4], S11, 0xf57c0faf);
  FF ( d, a, b, c, block[ 5], S12, 0x4787c62a);
  FF ( c, d, a, b, block[ 6], S13, 0xa8304613);
  FF ( b, c, d, a, block[ 7], S14, 0xfd469501);
  FF ( a, b, c, d, block[ 8], S11, 0x698098d8);
  FF ( d, a, b, c, block[ 9], S12, 0x8b44f7af);
  FF ( c, d, a, b, block[10], S13, 0xffff5bb1);
  FF ( b, c, d, a, block[11], S14, 0x895cd7be);
  FF ( a, b, c, d, block[12], S11, 0x6b901122);
  FF ( d, a, b, c, block[13], S12, 0xfd987193);
  FF ( c, d, a, b, block[14], S13, 0xa679438e);
  FF ( b, c, d, a, block[15], S14, 0x49b40821);

  #define S21 5
  #define S22 9
  #define S23 14
  #define S24 20

  GG ( a, b, c, d, block[ 1], S21, 0xf61e2562);
  GG ( d, a, b, c, block[ 6], S22, 0xc040b340);
  GG ( c, d, a, b, block[11], S23, 0x265e5a51);
  GG ( b, c, d, a, block[ 0], S24, 0xe9b6c7aa);
  GG ( a, b, c, d, block[ 5], S21, 0xd62f105d);
  GG ( d, a, b, c, block[10], S22, 0x02441453);
  GG ( c, d, a, b, block[15], S23, 0xd8a1e681);
  GG ( b, c, d, a, block[ 4], S24, 0xe7d3fbc8);
  GG ( a, b, c, d, block[ 9], S21, 0x21e1cde6);
  GG ( d, a, b, c, block[14], S22, 0xc33707d6);
  GG ( c, d, a, b, block[ 3], S23, 0xf4d50d87);
  GG ( b, c, d, a, block[ 8], S24, 0x455a14ed);
  GG ( a, b, c, d, block[13], S21, 0xa9e3e905);
  GG ( d, a, b, c, block[ 2], S22, 0xfcefa3f8);
  GG ( c, d, a, b, block[ 7], S23, 0x676f02d9);
  GG ( b, c, d, a, block[12], S24, 0x8d2a4c8a);

  #define S31 4
  #define S32 11
  #define S33 16
  #define S34 23

  HH ( a, b, c, d, block[ 5], S31, 0xfffa3942);
  HH ( d, a, b, c, block[ 8], S32, 0x8771f681);
  HH ( c, d, a, b, block[11], S33, 0x6d9d6122);
  HH ( b, c, d, a, block[14], S34, 0xfde5380c);
  HH ( a, b, c, d, block[ 1], S31, 0xa4beea44);
  HH ( d, a, b, c, block[ 4], S32, 0x4bdecfa9);
  HH ( c, d, a, b, block[ 7], S33, 0xf6bb4b60);
  HH ( b, c, d, a, block[10], S34, 0xbebfbc70);
  HH ( a, b, c, d, block[13], S31, 0x289b7ec6);
  HH ( d, a, b, c, block[ 0], S32, 0xeaa127fa);
  HH ( c, d, a, b, block[ 3], S33, 0xd4ef3085);
  HH ( b, c, d, a, block[ 6], S34, 0x04881d05);
  HH ( a, b, c, d, block[ 9], S31, 0xd9d4d039);
  HH ( d, a, b, c, block[12], S32, 0xe6db99e5);
  HH ( c, d, a, b, block[15], S33, 0x1fa27cf8);
  HH ( b, c, d, a, block[ 2], S34, 0xc4ac5665);

  #define S41 6
  #define S42 10
  #define S43 15
  #define S44 21

  II ( a, b, c, d, block[ 0], S41, 0xf4292244);
  II ( d, a, b, c, block[ 7], S42, 0x432aff97);
  II ( c, d, a, b, block[14], S43, 0xab9423a7);
  II ( b, c, d, a, block[ 5], S44, 0xfc93a039);
  II ( a, b, c, d, block[12], S41, 0x655b59c3);
  II ( d, a, b, c, block[ 3], S42, 0x8f0ccc92);
  II ( c, d, a, b, block[10], S43, 0xffeff47d);
  II ( b, c, d, a, block[ 1], S44, 0x85845dd1);
  II ( a, b, c, d, block[ 8], S41, 0x6fa87e4f);
  II ( d, a, b, c, block[15], S42, 0xfe2ce6e0);
  II ( c, d, a, b, block[ 6], S43, 0xa3014314);
  II ( b, c, d, a, block[13], S44, 0x4e0811a1);
  II ( a, b, c, d, block[ 4], S41, 0xf7537e82);
  II ( d, a, b, c, block[11], S42, 0xbd3af235);
  II ( c, d, a, b, block[ 2], S43, 0x2ad7d2bb);
  II ( b, c, d, a, block[ 9], S44, 0xeb86d391);

  digest[0] += a;
  digest[1] += b;
  digest[2] += c;
  digest[3] += d;
}

#endif /* MD5_H */