1 /* $OpenBSD: blf.h,v 1.6 2002/02/16 21:27:17 millert 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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Niels Provos. 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. 32 */ 33 34 #ifndef _BLF_H_ 35 #define _BLF_H_ 36 37 /* Schneier specifies a maximum key length of 56 bytes. 38 * This ensures that every key bit affects every cipher 39 * bit. However, the subkeys can hold up to 72 bytes. 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 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 82