shishi_n_fold (3)

#include <shishi.h>

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

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").

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.

Returns SHISHI_OK iff successful.

Report bugs to <[email protected]>.

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.

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.