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Man Pages


Manual Reference Pages  -  RIPEMD160_FILECHUNK (3)

NAME

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

CONTENTS

Library
Synopsis
Description
See Also
History
Authors
Bugs

LIBRARY


.Lb libmd

SYNOPSIS


.In sys/types.h
.In ripemd.h void RIPEMD160_Init RIPEMD160_CTX *context void RIPEMD160_Update RIPEMD160_CTX *context const unsigned char *data unsigned int len void 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

DESCRIPTION

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 does not disclose the actual input.

The RIPEMD160_Init, RIPEMD160_Update, and RIPEMD160_Final functions are the core functions. Allocate an
.Vt 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 return 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.

SEE ALSO

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

HISTORY

These functions appeared in
.Fx 4.0 .

AUTHORS

The core hash routines were implemented by Eric Young based on the published RIPEMD160 specification.

BUGS

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.
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