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.