TIGER(3) BSD Programmer's Manual TIGER(3)NAME
TIGERInit, TIGERUpdate, TIGERPad, TIGERFinal, TIGERTransform, TIGEREnd,
TIGERFile, TIGERFileChunk, TIGERData - calculate the TIGER message digest
SYNOPSIS
#include <sys/types.h>
#include <tiger.h>
void
TIGERInit(TIGER_CTX *ctx);
void
TIGERUpdate(TIGER_CTX *ctx, const uint8_t *data, size_t noctets);
void
TIGERPad(TIGER_CTX *ctx);
void
TIGERFinal(uint8_t digest[TIGER_DIGEST_LENGTH], TIGER_CTX *ctx);
void
TIGERTransform(uint64_t state[3],
const uint8_t block[TIGER_BLOCK_LENGTH]);
char *
TIGEREnd(TIGER_CTX *ctx, char *digest);
char *
TIGERFile(const char *filename, char *digest);
char *
TIGERFileChunk(const char *filename, char *digest, off_t offset,
off_t length);
char *
TIGERData(const uint8_t *data, size_t len, char *digest);
DESCRIPTION
The TIGER functions implement the 192-bit TIGER message digest hash algo-
rithm.
The TIGER functions are of a different family than the md4(3), md5(3),
rmd160(3), sha1(3), and sha2(3) functions, as well of a different family
from the whirlpool(3) functions and, despite not having been cryp-
tanalysed that much, are considered pretty secure. All share a similar
interface, though.
The TIGERInit() function initialises a TIGER_CTX context for use with
TIGERUpdate() and TIGERFinal(). The TIGERUpdate() function adds (con-
denses) data of length noctets to the context. TIGERFinal() is called
after processing and stores a message digest in the digest parameter.
For a description of the other functions, please refer e.g. the rmd160(3)
manual page.
EXAMPLES
The follow code fragment will calculate the digest for the string "abc",
which is "2aab1484e8c158f2bfb8c5ff41b57a525129131c957b5f93".
TIGER_CTX context;
uint8_t result[TIGER_DIGEST_LENGTH];
const char buf[] = "abc";
size_t n = strlen(buf);
TIGERInit(&context);
TIGERUpdate(&context, buf, n);
TIGERFinal(result, &context);
/* print the digest as one long sedecimal value */
printf("0x");
for (n = 0; n < TIGER_DIGEST_LENGTH; n++)
printf("%02x", result[n]);
putchar('\n');
Alternately, the helper functions could be used in the following way:
TIGER_CTX context;
uint8_t output[TIGER_DIGEST_STRING_LENGTH];
const char buf[] = "abc";
printf("0x%s\n", TIGERData(buf, strlen(buf), output));
SEE ALSOcksum(1), adler32(3), md4(3), md5(3), rmd160(3), sfv(3), sha1(3),
sha2(3), suma(3), whirlpool(3)
http://www.cs.technion.ac.il/~biham/Reports/Tiger/
HISTORY
The TIGER functions appeared in MirOS #10.
AUTHORS
This implementation of TIGER was written by Thorsten Glaser
<tg@mirbsd.de> modelled after the RIPEMD-160 implementation already in
libc and the TIGER reference implementation.
The TIGEREnd(), TIGERFile(), TIGERFileChunk(), and TIGERData() helper
functions are derived from code written by Poul-Henning Kamp.
MirOS BSD #10-current November 22, 2009 1