#include "yard.h"


#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


static void MD5Transform (UINT4 state[4], unsigned char block[64]);
static void Encode (unsigned char *output, UINT4 *input, unsigned int len);
static void Decode (UINT4 *output, unsigned char *input, unsigned int len);
static void MD5_memcpy (POINTER output, POINTER input, unsigned int len);
static void MD5_memset (POINTER output, int value, unsigned int len);

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
};


#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 ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))


#define FF(a, b, c, d, x, s, ac) { \
 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define GG(a, b, c, d, x, s, ac) { \
 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define HH(a, b, c, d, x, s, ac) { \
 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define II(a, b, c, d, x, s, ac) { \
 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }

void
md5_calc(unsigned char *output, unsigned char *input, unsigned int inlen)
{

	MD5_CTX	context;

	MD5Init(&context);
	MD5Update(&context, input, inlen);
	MD5Final(output, &context);
}


void MD5Init (MD5_CTX *context)                                        
{
  context->count[0] = context->count[1] = 0;

  context->state[0] = 0x67452301;
  context->state[1] = 0xefcdab89;
  context->state[2] = 0x98badcfe;
  context->state[3] = 0x10325476;
}


void MD5Update (MD5_CTX *context, unsigned char *input, unsigned int inputLen)
{
  unsigned int i, index, partLen;

  index = (unsigned int)((context->count[0] >> 3) & 0x3F);

  if ((context->count[0] += ((UINT4)inputLen << 3))
   < ((UINT4)inputLen << 3))
 context->count[1]++;
  context->count[1] += ((UINT4)inputLen >> 29);

  partLen = 64 - index;


  if (inputLen >= partLen) {
 MD5_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
 MD5Transform (context->state, context->buffer);

 for (i = partLen; i + 63 < inputLen; i += 64)
   MD5Transform (context->state, &input[i]);

 index = 0;
  }
  else
 i = 0;

  MD5_memcpy
 ((POINTER)&context->buffer[index], (POINTER)&input[i],
  inputLen-i);
}


void MD5Final (unsigned char digest[16], MD5_CTX *context)
{
  unsigned char bits[8];
  unsigned int index, padLen;

  Encode (bits, context->count, 8);


  index = (unsigned int)((context->count[0] >> 3) & 0x3f);
  padLen = (index < 56) ? (56 - index) : (120 - index);
  MD5Update (context, PADDING, padLen);

  MD5Update (context, bits, 8);

  Encode (digest, context->state, 16);


  MD5_memset ((POINTER)context, 0, sizeof (*context));
}


static void MD5Transform (UINT4 state[4], unsigned char block[64])
{
  UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

  Decode (x, block, 64);

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

  GG (a, b, c, d, x[ 1], S21, 0xf61e2562); 
  GG (d, a, b, c, x[ 6], S22, 0xc040b340); 
  GG (c, d, a, b, x[11], S23, 0x265e5a51); 
  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); 
  GG (a, b, c, d, x[ 5], S21, 0xd62f105d); 
  GG (d, a, b, c, x[10], S22,  0x2441453); 
  GG (c, d, a, b, x[15], S23, 0xd8a1e681); 
  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); 
  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); 
  GG (d, a, b, c, x[14], S22, 0xc33707d6); 
  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); 
  GG (b, c, d, a, x[ 8], S24, 0x455a14ed); 
  GG (a, b, c, d, x[13], S21, 0xa9e3e905); 
  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); 
  GG (c, d, a, b, x[ 7], S23, 0x676f02d9); 
  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); 

  HH (a, b, c, d, x[ 5], S31, 0xfffa3942); 
  HH (d, a, b, c, x[ 8], S32, 0x8771f681); 
  HH (c, d, a, b, x[11], S33, 0x6d9d6122); 
  HH (b, c, d, a, x[14], S34, 0xfde5380c); 
  HH (a, b, c, d, x[ 1], S31, 0xa4beea44); 
  HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); 
  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); 
  HH (b, c, d, a, x[10], S34, 0xbebfbc70); 
  HH (a, b, c, d, x[13], S31, 0x289b7ec6); 
  HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); 
  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); 
  HH (b, c, d, a, x[ 6], S34,  0x4881d05); 
  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); 
  HH (d, a, b, c, x[12], S32, 0xe6db99e5); 
  HH (c, d, a, b, x[15], S33, 0x1fa27cf8); 
  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); 

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

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


  MD5_memset ((POINTER)x, 0, sizeof (x));
}


static void Encode (unsigned char *output, UINT4 *input, unsigned int len)
{
  unsigned int i, j;

  for (i = 0, j = 0; j < len; i++, j += 4) {
 output[j] = (unsigned char)(input[i] & 0xff);
 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
  }
}


static void Decode (UINT4 *output, unsigned char *input, unsigned int len)
{
  unsigned int i, j;

  for (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);
}



static void MD5_memcpy (POINTER output, POINTER input, unsigned int len)
{
  unsigned int i;

  for (i = 0; i < len; i++)
 output[i] = input[i];
}


static void MD5_memset (POINTER output, int value, unsigned int len)
{
  unsigned int i;

  for (i = 0; i < len; i++)
 ((char *)output)[i] = (char)value;
}