text: /*    $OpenBSD: blf.h,v 1.6 2007/02/21 19:25:40 grunk Exp $    */
  
  /*
   * Blowfish - a fast block cipher designed by Bruce Schneier
   *
   * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *      This product includes software developed by Niels Provos.
   * 4. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef _BLF_H_
  #define _BLF_H_
  
  #include "bcryptc.h"
  
  /* Schneier states the maximum key length to be 56 bytes.
   * The way how the subkeys are initialized by the key up
   * to (N+2)*4 i.e. 72 bytes are utilized.
   * Warning: For normal blowfish encryption only 56 bytes
   * of the key affect all cipherbits.
   */
  
  #define BLF_N    16            /* Number of Subkeys */
  #define BLF_MAXKEYLEN ((BLF_N-2)*4)    /* 448 bits */
  #define BLF_MAXUTILIZED ((BLF_N+2)*4)    /* 576 bits */
  
  /* Blowfish context */
  typedef struct BlowfishContext {
      u_int32_t S[4][256];    /* S-Boxes */
      u_int32_t P[BLF_N + 2];    /* Subkeys */
  } blf_ctx;
  
  /* Raw access to customized Blowfish
   *    blf_key is just:
   *    Blowfish_initstate( state )
   *    Blowfish_expand0state( state, key, keylen )
   */
  
  void Blowfish_encipher(blf_ctx *, u_int32_t *);
  void Blowfish_decipher(blf_ctx *, u_int32_t *);
  void Blowfish_initstate(blf_ctx *);
  void Blowfish_expand0state(blf_ctx *, const u_int8_t *, u_int16_t);
  void Blowfish_expandstate(blf_ctx *, const u_int8_t *, u_int16_t, const u_int8_t *, u_int16_t);
  
  /* Standard Blowfish */
  
  void blf_key(blf_ctx *, const u_int8_t *, u_int16_t);
  void blf_enc(blf_ctx *, u_int32_t *, u_int16_t);
  void blf_dec(blf_ctx *, u_int32_t *, u_int16_t);
  
  /* Converts u_int8_t to u_int32_t */
  u_int32_t Blowfish_stream2word(const u_int8_t *, u_int16_t ,
                                 u_int16_t *);
  
  void blf_ecb_encrypt(blf_ctx *, u_int8_t *, u_int32_t);
  void blf_ecb_decrypt(blf_ctx *, u_int8_t *, u_int32_t);
  
  void blf_cbc_encrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
  void blf_cbc_decrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
  #endif
  