| 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 9.3 |