RMD160(3) | Library Functions Manual | RMD160(3) |
RMD160Init
, RMD160Update
,
RMD160Final
, RMD160Transform
,
RMD160End
, RMD160File
,
RMD160Data
—
#include <sys/types.h>
#include <rmd160.h>
void
RMD160Init
(RMD160_CTX
*context);
void
RMD160Update
(RMD160_CTX
*context, const u_char
*data, u_int
nbytes);
void
RMD160Final
(u_char
digest[20], RMD160_CTX
*context);
void
RMD160Transform
(uint32_t
state[5], const uint32_t
block[16]);
char *
RMD160End
(RMD160_CTX
*context, char
*buf);
char *
RMD160File
(char
*filename, char
*buf);
char *
RMD160Data
(u_char
*data, size_t len,
char *buf);
The RMD160 functions are considered to be more secure than the md4(3) and 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. When a null pointer is passed to
RMD160Final
() as first argument only the final
padding will be applied and 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.
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_char results[20]; char *buf; int n; buf = "abc"; n = strlen(buf); RMD160Init(&rmd); RMD160Update(&rmd, (u_char *)buf, n); RMD160Final(results, &rmd); /* Print the digest as one long hex value */ printf("0x"); for (n = 0; n < 20; n++) printf("%02x", results[n]); putchar('\n');
Alternately, the helper functions could be used in the following way:
RMD160_CTX rmd; u_char output[41]; 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
(), and
RMD160Data
() helper functions are derived from code
written by Poul-Henning Kamp.
July 16, 1997 | NetBSD 9.0 |