#ifndef __F_MD5_H__  
#define __F_MD5_H__ 
  
typedef struct  
{  
    unsigned int count[2];  
    unsigned int state[4];  
    unsigned char buffer[64];     
}MD5_CTX;  
  
  
#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 + ac;\
    a = ROTATE_LEFT(a,s);\
    a += b; \
}  

#define GG(a,b,c,d,x,s,ac)\
{\
    a += G(b,c,d) + x + ac;\
    a = ROTATE_LEFT(a,s); \
    a += b; \
}  

#define HH(a,b,c,d,x,s,ac)\
{ \
    a += H(b,c,d) + x + ac; \
    a = ROTATE_LEFT(a,s); \
    a += b; \
}  

#define II(a,b,c,d,x,s,ac)\
{ \
    a += I(b,c,d) + x + ac;\
    a = ROTATE_LEFT(a,s);\
    a += b;\
}                                              
void f_md5_init(MD5_CTX *context);  
void f_md5_update(MD5_CTX *context,unsigned char *input,unsigned int inputlen);  
void f_md5_final(MD5_CTX *context,unsigned char digest[16]);  
void f_md5_transform(unsigned int state[4],unsigned char block[64]);  
void f_md5_encode(unsigned char *output,unsigned int *input,unsigned int len);  
void f_md5_decode(unsigned int *output,unsigned char *input,unsigned int len);  
  
#endif  /*__F_MD5_H__*/