shishi_n_fold(3)

NAME
shishi_n_fold - API function

SYNOPSIS
#include <shishi.h>

int shishi_n_fold(Shishi * handle, const char * in, size_t inlen, char * out, size_t outlen);

ARGUMENTS

Shishi * handle
    shishi handle as allocated by shishi_init().

const char * in
    input array with data to decrypt.

size_t inlen
    size of input array with data to decrypt ("M").

char * out
    output array with decrypted data.

size_t outlen
    size of output array ("N").

DESCRIPTION
Fold data into a fixed length output array, with the intent to give each input bit approximately equal weight in determining the value of each output bit.

The algorithm is from "A Better Key Schedule For DES-like Ciphers" by Uri Blumenthal and Steven M. Bellovin, http://www.research.att.com/~smb/papers/ides.pdf, although the sample vectors provided by the paper are incorrect.

RETURN VALUE
Returns SHISHI_OK iff successful.

REPORTING BUGS
Report bugs to <bug-shishi@gnu.org>. GNU Shishi home page: http://www.gnu.org/software/shishi/ General help using GNU software: http://www.gnu.org/gethelp/

COPYRIGHT
Copyright © 2002-2022 Simon Josefsson.
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

SEE ALSO
The full documentation for shishi is maintained as a Texinfo manual. If the info and shishi programs are properly installed at your site, the command

    info shishi

should give you access to the complete manual.