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     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
     (digest) 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 doesn't disclose the actual

     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
     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)


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


     These functions appeared in FreeBSD 4.0.


     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 doesn't exist.

FreeBSD 5.4		       February 26, 1999		   FreeBSD 5.4


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