RMD160INIT(3) | Library Functions Manual | RMD160INIT(3) |
RMD160Init
, RMD160Update
,
RMD160Pad
, RMD160Final
,
RMD160Transform
, RMD160End
,
RMD160File
, RMD160FileChunk
,
RMD160Data
—
#include <sys/types.h>
#include <rmd160.h>
void
RMD160Init
(RMD160_CTX
*context);
void
RMD160Update
(RMD160_CTX
*context, const u_int8_t
*data, size_t
nbytes);
void
RMD160Pad
(RMD160_CTX
*context);
void
RMD160Final
(u_int8_t
digest[RMD160_DIGEST_LENGTH],
RMD160_CTX *context);
void
RMD160Transform
(u_int32_t
state[5], const u_int8_t
block[RMD160_BLOCK_LENGTH]);
char *
RMD160End
(RMD160_CTX
*context, char
*buf);
char *
RMD160File
(const
char *filename, char
*buf);
char *
RMD160FileChunk
(const
char *filename, char
*buf, off_t offset,
off_t length);
char *
RMD160Data
(const
u_int8_t *data, size_t
len, char
*buf);
The RMD160 functions are considered to be more secure than the md5(3) functions and at least as secure as the sha1(3) function. All share a similar interface.
The RMD160Init
() function initializes a
RMD160_CTX context for use with
RMD160Update
(), and
RMD160Final
(). The
RMD160Update
() function adds
data of length nbytes to the
RMD160_CTX specified by context.
RMD160Final
() is called when all data has been added
via RMD160Update
() and stores a message digest in
the digest parameter.
The RMD160Pad
() function can be used to
apply padding to the message digest as in
RMD160Final
(), but the current context can still be
used with RMD160Update
().
The RMD160Transform
() function is used by
RMD160Update
() to hash 512-bit blocks and forms the
core of the algorithm. Most programs should use the interface provided by
RMD160Init
(), RMD160Update
()
and RMD160Final
() instead of calling
RMD160Transform
() directly.
The RMD160End
() function is a front end
for RMD160Final
() which converts the digest into an
ASCII representation of the 160 bit digest in hexadecimal.
The RMD160File
() function calculates the
digest for a file and returns the result via
RMD160End
(). If RMD160File
()
is unable to open the file a NULL pointer is returned.
RMD160FileChunk
() behaves like
RMD160File
() but calculates the digest only for that
portion of the file starting at offset and continuing
for length bytes or until end of file is reached,
whichever comes first. A zero length can be specified
to read until end of file. A negative length or
offset will be ignored.
The RMD160Data
() function calculates the
digest of an arbitrary string and returns the result via
RMD160End
().
For each of the RMD160End
(),
RMD160File
(), and
RMD160Data
() functions the buf
parameter should either be a string of at least 41 characters in size or a
NULL pointer. In the latter case, space will be dynamically allocated via
malloc(3) and should be freed using
free(3) when it is no longer needed.
RMD160_CTX rmd; u_int8_t results[RMD160_DIGEST_LENGTH]; char *buf; int n; buf = "abc"; n = strlen(buf); RMD160Init(&rmd); RMD160Update(&rmd, (u_int8_t *)buf, n); RMD160Final(results, &rmd); /* Print the digest as one long hex value */ printf("0x"); for (n = 0; n < RMD160_DIGEST_LENGTH; n++) printf("%02x", results[n]); putchar('\n');
Alternately, the helper functions could be used in the following way:
RMD160_CTX rmd; u_int8_t output[RMD160_DIGEST_STRING_LENGTH]; char *buf = "abc"; printf("0x%s\n", RMD160Data(buf, strlen(buf), output));
H. Dobbertin, A. Bosselaers, B. Preneel, RIPEMD-160, a strengthened version of RIPEMD.
Information technology - Security techniques - Hash-functions - Part 3: Dedicated hash-functions, ISO/IEC 10118-3.
H. Dobbertin, A. Bosselaers, B. Preneel, The RIPEMD-160 cryptographic hash function, Dr. Dobb's Journal, Vol. 22, No. 1, pp. 24-28, January 1997.
The RMD160End
(),
RMD160File
(),
RMD160FileChunk
(), and
RMD160Data
() helper functions are derived from code
written by Poul-Henning Kamp.
January 25, 2019 | OpenBSD-current |