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Annotation of src/include/blf.h, Revision 1.2

1.2     ! provos      1: /* $OpenBSD: blf.h,v 1.1 1997/02/13 16:32:11 provos Exp $ */
1.1       provos      2: /*
                      3:  * Blowfish - a fast block cipher designed by Bruce Schneier
                      4:  *
                      5:  * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
1.2     ! provos      6:  * All rights reserved.
1.1       provos      7:  *
1.2     ! provos      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 Theo de Raadt.
        !            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.
1.1       provos     32:  */
                     33:
                     34: #ifndef _BLF_H_
                     35: #define _BLF_H_
                     36:
                     37: /* Schneier states the maximum key length to be 56 bytes.
                     38:  * The way how the subkeys are initalized by the key up
                     39:  * to (N+2)*4 i.e. 72 bytes are utilized.
                     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:
                     47: /* Blowfish context */
                     48: typedef struct BlowfishContext {
                     49:        u_int32_t S[4][256];    /* S-Boxes */
                     50:        u_int32_t P[BLF_N + 2]; /* Subkeys */
                     51: } blf_ctx;
                     52:
                     53: /* Raw access to customized Blowfish
                     54:  *     blf_key is just:
                     55:  *     Blowfish_initstate( state )
                     56:  *     Blowfish_expand0state( state, key, keylen )
                     57:  */
                     58:
                     59: void Blowfish_encipher __P((blf_ctx *, u_int32_t *, u_int32_t *));
                     60: void Blowfish_decipher __P((blf_ctx *, u_int32_t *, u_int32_t *));
                     61: void Blowfish_initstate __P((blf_ctx *));
                     62: void Blowfish_expand0state __P((blf_ctx *, u_int8_t *, u_int16_t));
                     63: void    Blowfish_expandstate
                     64:         __P((blf_ctx *, u_int8_t *, u_int16_t, u_int8_t *, u_int16_t));
                     65:
                     66: /* Standard Blowfish */
                     67:
                     68: void blf_key __P((blf_ctx *, u_int8_t *, u_int16_t));
                     69: void blf_enc __P((blf_ctx *, u_int32_t *, u_int16_t));
                     70: void blf_dec __P((blf_ctx *, u_int32_t *, u_int16_t));
                     71:
                     72: /* Converts u_int8_t to u_int32_t */
                     73: u_int32_t Blowfish_stream2word __P((u_int8_t *, u_int16_t , u_int16_t *));
                     74:
                     75: #endif