1 /* $OpenBSD: blf.h,v 1.8 2021/11/29 01:04:45 djm 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. The name of the author may not be used to endorse or promote products 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. 29 */ 30 31 #ifndef _BLF_H_ 32 #define _BLF_H_ 33 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. 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 */ 43 #define BLF_MAXUTILIZED ((BLF_N+2)*4) /* 576 bits */ 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 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); 61 void Blowfish_expandstate 62 (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 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); 72 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); 75 76 /* Converts u_int8_t to u_int32_t */ 77 u_int32_t Blowfish_stream2word(const u_int8_t *, u_int16_t , u_int16_t *); 78 79 #endif 80