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RIPEMD(3)		 BSD Library Functions Manual		     RIPEMD(3)

     RIPEMD160_Init, RIPEMD160_Update, RIPEMD160_Final,	RIPEMD160_End,
     RIPEMD160_File, RIPEMD160_FileChunk, RIPEMD160_Data -- calculate the
     RIPEMD160 message digest

     Message Digest (MD4, MD5, etc.) Support Library (libmd, -lmd)

     #include <sys/types.h>
     #include <ripemd.h>

     RIPEMD160_Init(RIPEMD160_CTX *context);

     RIPEMD160_Update(RIPEMD160_CTX *context, const unsigned char *data,
	 unsigned int len);

     RIPEMD160_Final(unsigned char digest[20], RIPEMD160_CTX *context);

     char *
     RIPEMD160_End(RIPEMD160_CTX *context, char	*buf);

     char *
     RIPEMD160_File(const char *filename, char *buf);

     char *
     RIPEMD160_FileChunk(const char *filename, char *buf, off_t	offset,
	 off_t length);

     char *
     RIPEMD160_Data(const unsigned char	*data, unsigned	int len, char *buf);

     The RIPEMD160_ functions calculate	a 160-bit cryptographic	checksum (di-
     gest) for any number of input bytes.  A cryptographic checksum is a one-
     way hash function;	that is, it is computationally impractical to find the
     input corresponding to a particular output.  This net result is a
     "fingerprint" of the input-data, which does not disclose the actual in-

     The RIPEMD160_Init(), RIPEMD160_Update(), and RIPEMD160_Final() functions
     are the core functions.  Allocate an RIPEMD160_CTX, initialize it with
     RIPEMD160_Init(), run over	the data with RIPEMD160_Update(), and finally
     extract the result	using RIPEMD160_Final().

     The RIPEMD160_End() function is a wrapper for RIPEMD160_Final() which
     converts the return value to a 41-character (including the	terminating
     '\0') ASCII string	which represents the 160 bits in hexadecimal.

     The RIPEMD160_File() function calculates the digest of a file, and	uses
     RIPEMD160_End() to	return the result.  If the file	cannot be opened, a
     null pointer is returned.	The RIPEMD160_FileChunk() function is similar
     to	RIPEMD160_File(), but it only calculates the digest over a byte-range
     of	the file specified, starting at	offset and spanning length bytes.  If
     the length	parameter is specified as 0, or	more than the length of	the
     remaining part of the file, RIPEMD160_FileChunk() calculates the digest
     from offset to the	end of file.  The RIPEMD160_Data() function calculates
     the digest	of a chunk of data in memory, and uses RIPEMD160_End() to re-
     turn the result.

     When using	RIPEMD160_End(), RIPEMD160_File(), or RIPEMD160_Data(),	the
     buf argument can be a null	pointer, in which case the returned string is
     allocated with malloc(3) and subsequently must be explicitly deallocated
     using free(3) after use.  If the buf argument is non-null it must point
     to	at least 41 characters of buffer space.

     md2(3), md4(3), md5(3), sha(3)

     These functions appeared in FreeBSD 4.0.

     The core hash routines were implemented by	Eric Young based on the	pub-
     lished RIPEMD160 specification.

     No	method is known	to exist which finds two files having the same hash
     value, nor	to find	a file with a specific hash value.  There is on	the
     other hand	no guarantee that such a method	does not exist.

BSD			       February	26, 1999			   BSD


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