1 /* $OpenBSD: blf.h,v 1.7 2021/11/29 01:04:45 djm Exp $ */ 2 3 /* 4 * Blowfish - a fast block cipher designed by Bruce Schneier 5 * 6 * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _BLF_H_ 33 #define _BLF_H_ 34 35 /* Schneier states the maximum key length to be 56 bytes. 36 * The way how the subkeys are initialized by the key up 37 * to (N+2)*4 i.e. 72 bytes are utilized. 38 * Warning: For normal blowfish encryption only 56 bytes 39 * of the key affect all cipherbits. 40 */ 41 42 #define BLF_N 16 /* Number of Subkeys */ 43 #define BLF_MAXKEYLEN ((BLF_N-2)*4) /* 448 bits */ 44 #define BLF_MAXUTILIZED ((BLF_N+2)*4) /* 576 bits */ 45 46 /* Blowfish context */ 47 typedef struct BlowfishContext { 48 u_int32_t S[4][256]; /* S-Boxes */ 49 u_int32_t P[BLF_N + 2]; /* Subkeys */ 50 } blf_ctx; 51 52 /* Raw access to customized Blowfish 53 * blf_key is just: 54 * Blowfish_initstate( state ) 55 * Blowfish_expand0state( state, key, keylen ) 56 */ 57 58 void Blowfish_encipher(blf_ctx *, u_int32_t *); 59 void Blowfish_decipher(blf_ctx *, u_int32_t *); 60 void Blowfish_initstate(blf_ctx *); 61 void Blowfish_expand0state(blf_ctx *, const u_int8_t *, u_int16_t); 62 void Blowfish_expandstate(blf_ctx *, const u_int8_t *, u_int16_t, const u_int8_t *, u_int16_t); 63 64 /* Standard Blowfish */ 65 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); 69 70 /* Converts u_int8_t to u_int32_t */ 71 u_int32_t Blowfish_stream2word(const u_int8_t *, u_int16_t , 72 u_int16_t *); 73 74 void blf_ecb_encrypt(blf_ctx *, u_int8_t *, u_int32_t); 75 void blf_ecb_decrypt(blf_ctx *, u_int8_t *, u_int32_t); 76 77 void blf_cbc_encrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t); 78 void blf_cbc_decrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t); 79 #endif 80