gl/arcfour.h

   1 /* arcfour.h --- The arcfour stream cipher
   2  * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005
   3  *    Free Software Foundation, Inc.
   4  *
   5  * This file is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published
   7  * by the Free Software Foundation; either version 2, or (at your
   8  * option) any later version.
   9  *
  10  * This file is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this file; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA.
  19  *
  20  */
  21
  22 /* Code from Libgcrypt adapted for gnulib by Simon Josefsson. */
  23
  24 #ifndef ARCFOUR_H
  25 # define ARCFOUR_H
  26
  27 # include <stddef.h>
  28 # include <stdint.h>
  29
  30 #define ARCFOUR_SBOX_SIZE 256
  31
  32 typedef struct
  33 {
  34   char sbox[ARCFOUR_SBOX_SIZE];
  35   uint8_t idx_i, idx_j;
  36 } arcfour_context;
  37
  38 /* Apply ARCFOUR stream to INBUF placing the result in OUTBUF, both of
  39    LENGTH size.  CONTEXT must be initialized with arcfour_setkey
  40    before this function is called. */
  41 extern void
  42 arcfour_stream (arcfour_context * context,
  43                 const char *inbuf, char *outbuf, size_t length);
  44
  45 /* Initialize CONTEXT using encryption KEY of KEYLEN bytes.  KEY
  46    should be 40 bits (5 bytes) or longer.  The KEY cannot be zero
  47    length.  */
  48 extern void
  49 arcfour_setkey (arcfour_context * context, const char *key, size_t keylen);
  50
  51 #endif /* ARCFOUR_H */