NAME
Tiger - Perl interface to the Tiger Hash Algorithm
SYNOPSIS
use Tiger;
$context = new Tiger;
$context->reset();
$context->add(LIST);
$context->addfile(HANDLE);
$digest = $context->digest();
$string = $context->hexdigest();
$digest = $context->hash($string);
$string = $context->hexhash($string);
DESCRIPTION
The Tiger module allows you to use the Tiger hash algorithm
developed by Ross Anderson and Eli Biham in Perl programs.
A new Tiger context object is created with the new operation.
Multiple simultaneous digest context can be maintained if
desired. The context is updated with the add operation which
adds the strings contained in the *LIST* parameter.
The final message digest value is returned by the digest
operation as a 24-byte binary string. This operation delivers
the result of operations since the last new or reset operation.
Once the operation has been performed, the context must be reset
before being used to calculate another digest value.
Several convenience functions are also provided. The addfile
operation takes an open file-handle and reads it until end-of
file in 8192-byte blocks adding the contents to the context. The
hexdigest operation calls digest and returns the result as a
printable string of hexadecimal digits in eight-digit groups.
The hash operation performs the complete series of steps: reset,
add, digest on the supplied scalar value, and returns the result
as a 24-byte binary string. The hexhash operation does the same
thing, but returns the result in the format of the hexdigest
operation.
NOTE
The Tiger extension may be redistributed either under the GPL or
the Perl Artistic License. The Tiger code has been appropriated
from the GNU Privacy Guard, and slightly modified to interface
with Perl.
AUTHOR
The Tiger interface was written by Rafael Sevilla
(`dido@pacific.net.ph'), shamelessly stealing from the SHA
interface written by Uwe Hollerbach (`uh@alumni.caltech.edu').