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Annotation of src/include/blf.h, Revision 1.8

1.8     ! djm         1: /* $OpenBSD: blf.h,v 1.7 2007/03/14 17:59:41 grunk 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.
1.8     ! djm        16:  * 3. The name of the author may not be used to endorse or promote products
1.2       provos     17:  *    derived from this software without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     20:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     21:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     22:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     23:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     24:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     25:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     26:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     27:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     28:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.1       provos     29:  */
                     30:
                     31: #ifndef _BLF_H_
                     32: #define _BLF_H_
                     33:
1.5       aaron      34: /* Schneier specifies a maximum key length of 56 bytes.
                     35:  * This ensures that every key bit affects every cipher
                     36:  * bit.  However, the subkeys can hold up to 72 bytes.
1.1       provos     37:  * Warning: For normal blowfish encryption only 56 bytes
                     38:  * of the key affect all cipherbits.
                     39:  */
                     40:
                     41: #define BLF_N  16                      /* Number of Subkeys */
                     42: #define BLF_MAXKEYLEN ((BLF_N-2)*4)    /* 448 bits */
1.7       grunk      43: #define BLF_MAXUTILIZED ((BLF_N+2)*4)  /* 576 bits */
1.1       provos     44:
                     45: /* Blowfish context */
                     46: typedef struct BlowfishContext {
                     47:        u_int32_t S[4][256];    /* S-Boxes */
                     48:        u_int32_t P[BLF_N + 2]; /* Subkeys */
                     49: } blf_ctx;
                     50:
                     51: /* Raw access to customized Blowfish
                     52:  *     blf_key is just:
                     53:  *     Blowfish_initstate( state )
                     54:  *     Blowfish_expand0state( state, key, keylen )
                     55:  */
                     56:
1.6       millert    57: void Blowfish_encipher(blf_ctx *, u_int32_t *, u_int32_t *);
                     58: void Blowfish_decipher(blf_ctx *, u_int32_t *, u_int32_t *);
                     59: void Blowfish_initstate(blf_ctx *);
                     60: void Blowfish_expand0state(blf_ctx *, const u_int8_t *, u_int16_t);
1.3       provos     61: void Blowfish_expandstate
1.6       millert    62: (blf_ctx *, const u_int8_t *, u_int16_t, const u_int8_t *, u_int16_t);
1.1       provos     63:
                     64: /* Standard Blowfish */
                     65:
1.6       millert    66: void blf_key(blf_ctx *, const u_int8_t *, u_int16_t);
                     67: void blf_enc(blf_ctx *, u_int32_t *, u_int16_t);
                     68: void blf_dec(blf_ctx *, u_int32_t *, u_int16_t);
1.4       provos     69:
1.6       millert    70: void blf_ecb_encrypt(blf_ctx *, u_int8_t *, u_int32_t);
                     71: void blf_ecb_decrypt(blf_ctx *, u_int8_t *, u_int32_t);
1.4       provos     72:
1.6       millert    73: void blf_cbc_encrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
                     74: void blf_cbc_decrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
1.1       provos     75:
                     76: /* Converts u_int8_t to u_int32_t */
1.6       millert    77: u_int32_t Blowfish_stream2word(const u_int8_t *, u_int16_t , u_int16_t *);
1.1       provos     78:
                     79: #endif