shishi_n_fold(3)						      shishi							  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>.

COPYRIGHT

       Copyright (C) 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.

shishi								       1.0.1							  shishi_n_fold(3)