blf.h (3208B)
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 #include <stdint.h> 32 33 #ifndef _BLF_H_ 34 #define _BLF_H_ 35 36 /* Schneier specifies a maximum key length of 56 bytes. 37 * This ensures that every key bit affects every cipher 38 * bit. However, the subkeys can hold up to 72 bytes. 39 * Warning: For normal blowfish encryption only 56 bytes 40 * of the key affect all cipherbits. 41 */ 42 43 #define BLF_N 16 /* Number of Subkeys */ 44 #define BLF_MAXKEYLEN ((BLF_N-2)*4) /* 448 bits */ 45 #define BLF_MAXUTILIZED ((BLF_N+2)*4) /* 576 bits */ 46 47 /* Blowfish context */ 48 typedef struct BlowfishContext { 49 uint32_t S[4][256]; /* S-Boxes */ 50 uint32_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(blf_ctx *, uint32_t *, uint32_t *); 60 void Blowfish_decipher(blf_ctx *, uint32_t *, uint32_t *); 61 void Blowfish_initstate(blf_ctx *); 62 void Blowfish_expand0state(blf_ctx *, const uint8_t *, uint16_t); 63 void Blowfish_expandstate 64 (blf_ctx *, const uint8_t *, uint16_t, const uint8_t *, uint16_t); 65 66 /* Standard Blowfish */ 67 68 void blf_key(blf_ctx *, const uint8_t *, uint16_t); 69 void blf_enc(blf_ctx *, uint32_t *, uint16_t); 70 void blf_dec(blf_ctx *, uint32_t *, uint16_t); 71 72 void blf_ecb_encrypt(blf_ctx *, uint8_t *, uint32_t); 73 void blf_ecb_decrypt(blf_ctx *, uint8_t *, uint32_t); 74 75 void blf_cbc_encrypt(blf_ctx *, uint8_t *, uint8_t *, uint32_t); 76 void blf_cbc_decrypt(blf_ctx *, uint8_t *, uint8_t *, uint32_t); 77 78 /* Converts uint8_t to uint32_t */ 79 uint32_t Blowfish_stream2word(const uint8_t *, uint16_t , uint16_t *); 80 81 #endif