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/*	 
	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. 
*/ 
 
/* 
	Following work is derived from "derived from the RSA Data 
	Security, Inc. MD5 Message-Digest Algorithm" 
*/ 
 
 
//	POINTER defines a generic pointer type  
typedef unsigned char *POINTER; 
 
//	UINT2 defines a two byte word  
typedef unsigned short int UINT2; 
 
//	UINT4 defines a four byte word  
typedef unsigned long int UINT4; 
 
typedef struct  
{ 
	UINT4 state[4];             //	state (ABCD) 
	UINT4 count[2];				//	number of bits, modulo 2^64 (lsb first) 
	unsigned char buffer[64];   //	input buffer  
 
} MD5_CTX; 
 
 
 
 
#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 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 
}; 
 
//	F, G, H and I are basic MD5 functions. 
 
#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))) 
 
//	ROTATE_LEFT rotates x left n bits. 
 
#define ROTATE_LEFT(x, n) (((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. 
// 
#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); \ 
  } 
 
extern void	MD5Init(MD5_CTX *); 
 
extern void	MD5Update(MD5_CTX *, unsigned char *, unsigned int); 
 
extern void	MD5Final(unsigned char [16], MD5_CTX *); 
 
extern void	hmac_md5( 
				 unsigned char*  text,		 
				 int             text_len,   
				 unsigned char*  key,        
				 int             key_len,    
				 unsigned char*  digest      
				 );