include/blf.h

   1 /* $OpenBSD: blf.h,v 1.7 2007/03/14 17:59:41 grunk Exp $ */
   2 /*
   3  * Blowfish - a fast block cipher designed by Bruce Schneier
   4  *
   5  * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by Niels Provos.
  19  * 4. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef _BLF_H_
  35 #define _BLF_H_
  36
  37 /* Schneier specifies a maximum key length of 56 bytes.
  38  * This ensures that every key bit affects every cipher
  39  * bit.  However, the subkeys can hold up to 72 bytes.
  40  * Warning: For normal blowfish encryption only 56 bytes
  41  * of the key affect all cipherbits.
  42  */
  43
  44 #define BLF_N   16                      /* Number of Subkeys */
  45 #define BLF_MAXKEYLEN ((BLF_N-2)*4)     /* 448 bits */
  46 #define BLF_MAXUTILIZED ((BLF_N+2)*4)   /* 576 bits */
  47
  48 /* Blowfish context */
  49 typedef struct BlowfishContext {
  50         u_int32_t S[4][256];    /* S-Boxes */
  51         u_int32_t P[BLF_N + 2]; /* Subkeys */
  52 } blf_ctx;
  53
  54 /* Raw access to customized Blowfish
  55  *      blf_key is just:
  56  *      Blowfish_initstate( state )
  57  *      Blowfish_expand0state( state, key, keylen )
  58  */
  59
  60 void Blowfish_encipher(blf_ctx *, u_int32_t *, u_int32_t *);
  61 void Blowfish_decipher(blf_ctx *, u_int32_t *, u_int32_t *);
  62 void Blowfish_initstate(blf_ctx *);
  63 void Blowfish_expand0state(blf_ctx *, const u_int8_t *, u_int16_t);
  64 void Blowfish_expandstate
  65 (blf_ctx *, const u_int8_t *, u_int16_t, const u_int8_t *, u_int16_t);
  66
  67 /* Standard Blowfish */
  68
  69 void blf_key(blf_ctx *, const u_int8_t *, u_int16_t);
  70 void blf_enc(blf_ctx *, u_int32_t *, u_int16_t);
  71 void blf_dec(blf_ctx *, u_int32_t *, u_int16_t);
  72
  73 void blf_ecb_encrypt(blf_ctx *, u_int8_t *, u_int32_t);
  74 void blf_ecb_decrypt(blf_ctx *, u_int8_t *, u_int32_t);
  75
  76 void blf_cbc_encrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
  77 void blf_cbc_decrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
  78
  79 /* Converts u_int8_t to u_int32_t */
  80 u_int32_t Blowfish_stream2word(const u_int8_t *, u_int16_t , u_int16_t *);
  81
  82 #endif