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>.
COPYRIGHT¶
Copyright © 2002-2010 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.