md4.h

经典的ppp程序

/*
** ********************************************************************
** md4.h -- Header file for implementation of                        **
** MD4 Message Digest Algorithm                                      **
** Updated: 2/13/90 by Ronald L. Rivest                              **
** (C) 1990 RSA Data Security, Inc.                                  **
** ********************************************************************
*/

#ifndef __P
# if defined(__STDC__) || defined(__GNUC__)
#  define __P(x) x
# else
#  define __P(x) ()
# endif
#endif


/* MDstruct is the data structure for a message digest computation.
*/
typedef struct {
	unsigned int buffer[4]; /* Holds 4-word result of MD computation */
	unsigned char count[8]; /* Number of bits processed so far */
	unsigned int done;      /* Nonzero means MD computation finished */
} MD4_CTX;

/* MD4Init(MD4_CTX *)
** Initialize the MD4_CTX prepatory to doing a message digest
** computation.
*/
extern void MD4Init __P((MD4_CTX *MD));

/* MD4Update(MD,X,count)
** Input: X -- a pointer to an array of unsigned characters.
**        count -- the number of bits of X to use (an unsigned int).
** Updates MD using the first "count" bits of X.
** The array pointed to by X is not modified.
** If count is not a multiple of 8, MD4Update uses high bits of
** last byte.
** This is the basic input routine for a user.
** The routine terminates the MD computation when count < 512, so
** every MD computation should end with one call to MD4Update with a
** count less than 512.  Zero is OK for a count.
*/
extern void MD4Update __P((MD4_CTX *MD, unsigned char *X, unsigned int count));

/* MD4Print(MD)
** Prints message digest buffer MD as 32 hexadecimal digits.
** Order is from low-order byte of buffer[0] to high-order byte
** of buffer[3].
** Each byte is printed with high-order hexadecimal digit first.
*/
extern void MD4Print __P((MD4_CTX *));

/* MD4Final(buf, MD)
** Returns message digest from MD and terminates the message
** digest computation.
*/
extern void MD4Final __P((unsigned char *, MD4_CTX *));

/*
** End of md4.h
****************************(cut)***********************************/