lib/libcrypt/blowfish.h

   1 /*
   2  * Blowfish - a fast block cipher designed by Bruce Schneier
   3  *
   4  * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Niels Provos.
  18  * 4. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/secure/lib/libcrypt/blowfish.h,v 1.1.2.1 2001/05/24 12:20:03 markm Exp $
  33  * $DragonFly: src/secure/lib/libcrypt/blowfish.h,v 1.3 2003/11/14 03:54:32 dillon Exp $
  34  */
  35
  36 /*
  37  * FreeBSD implementation by Paul Herman <pherman@frenchfries.net>
  38  */
  39
  40 #ifndef _BLF_H_
  41 #define _BLF_H_
  42
  43 /* Schneier states the maximum key length to be 56 bytes.
  44  * The way how the subkeys are initalized by the key up
  45  * to (N+2)*4 i.e. 72 bytes are utilized.
  46  * Warning: For normal blowfish encryption only 56 bytes
  47  * of the key affect all cipherbits.
  48  */
  49
  50 #define BLF_N   16                      /* Number of Subkeys */
  51 #define BLF_MAXKEYLEN ((BLF_N-2)*4)     /* 448 bits */
  52
  53 /* Blowfish context */
  54 typedef struct BlowfishContext {
  55         u_int32_t S[4][256];    /* S-Boxes */
  56         u_int32_t P[BLF_N + 2]; /* Subkeys */
  57 } blf_ctx;
  58
  59 /* Raw access to customized Blowfish
  60  *      blf_key is just:
  61  *      Blowfish_initstate( state )
  62  *      Blowfish_expand0state( state, key, keylen )
  63  */
  64
  65 void Blowfish_encipher (blf_ctx *, u_int32_t *, u_int32_t *);
  66 void Blowfish_decipher (blf_ctx *, u_int32_t *, u_int32_t *);
  67 void Blowfish_initstate (blf_ctx *);
  68 void Blowfish_expand0state (blf_ctx *, const u_int8_t *, u_int16_t);
  69 void Blowfish_expandstate
  70     (blf_ctx *, const u_int8_t *, u_int16_t, const u_int8_t *, u_int16_t);
  71
  72 /* Standard Blowfish */
  73
  74 void blf_key (blf_ctx *, const u_int8_t *, u_int16_t);
  75 void blf_enc (blf_ctx *, u_int32_t *, u_int16_t);
  76 void blf_dec (blf_ctx *, u_int32_t *, u_int16_t);
  77
  78 void blf_ecb_encrypt (blf_ctx *, u_int8_t *, u_int32_t);
  79 void blf_ecb_decrypt (blf_ctx *, u_int8_t *, u_int32_t);
  80
  81 void blf_cbc_encrypt (blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
  82 void blf_cbc_decrypt (blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
  83
  84 /* Converts u_int8_t to u_int32_t */
  85 u_int32_t Blowfish_stream2word (const u_int8_t *, u_int16_t , u_int16_t *);
  86
  87 #endif