| Damien Miller | 1ff130d | 2013-12-07 11:51:51 +1100 | [diff] [blame] | 1 | /* $OpenBSD: blf.h,v 1.7 2007/03/14 17:59:41 grunk 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 | #include "includes.h" |
| 38 | |
| 39 | #if !defined(HAVE_BCRYPT_PBKDF) && !defined(HAVE_BLH_H) |
| 40 | |
| 41 | /* Schneier specifies a maximum key length of 56 bytes. |
| 42 | * This ensures that every key bit affects every cipher |
| 43 | * bit. However, the subkeys can hold up to 72 bytes. |
| 44 | * Warning: For normal blowfish encryption only 56 bytes |
| 45 | * of the key affect all cipherbits. |
| 46 | */ |
| 47 | |
| 48 | #define BLF_N 16 /* Number of Subkeys */ |
| 49 | #define BLF_MAXKEYLEN ((BLF_N-2)*4) /* 448 bits */ |
| 50 | #define BLF_MAXUTILIZED ((BLF_N+2)*4) /* 576 bits */ |
| 51 | |
| 52 | /* Blowfish context */ |
| 53 | typedef struct BlowfishContext { |
| 54 | u_int32_t S[4][256]; /* S-Boxes */ |
| 55 | u_int32_t P[BLF_N + 2]; /* Subkeys */ |
| 56 | } blf_ctx; |
| 57 | |
| 58 | /* Raw access to customized Blowfish |
| 59 | * blf_key is just: |
| 60 | * Blowfish_initstate( state ) |
| 61 | * Blowfish_expand0state( state, key, keylen ) |
| 62 | */ |
| 63 | |
| 64 | void Blowfish_encipher(blf_ctx *, u_int32_t *, u_int32_t *); |
| 65 | void Blowfish_decipher(blf_ctx *, u_int32_t *, u_int32_t *); |
| 66 | void Blowfish_initstate(blf_ctx *); |
| 67 | void Blowfish_expand0state(blf_ctx *, const u_int8_t *, u_int16_t); |
| 68 | void Blowfish_expandstate |
| 69 | (blf_ctx *, const u_int8_t *, u_int16_t, const u_int8_t *, u_int16_t); |
| 70 | |
| 71 | /* Standard Blowfish */ |
| 72 | |
| 73 | void blf_key(blf_ctx *, const u_int8_t *, u_int16_t); |
| 74 | void blf_enc(blf_ctx *, u_int32_t *, u_int16_t); |
| 75 | void blf_dec(blf_ctx *, u_int32_t *, u_int16_t); |
| 76 | |
| 77 | void blf_ecb_encrypt(blf_ctx *, u_int8_t *, u_int32_t); |
| 78 | void blf_ecb_decrypt(blf_ctx *, u_int8_t *, u_int32_t); |
| 79 | |
| 80 | void blf_cbc_encrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t); |
| 81 | void blf_cbc_decrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t); |
| 82 | |
| 83 | /* Converts u_int8_t to u_int32_t */ |
| 84 | u_int32_t Blowfish_stream2word(const u_int8_t *, u_int16_t , u_int16_t *); |
| 85 | |
| 86 | #endif /* !defined(HAVE_BCRYPT_PBKDF) && !defined(HAVE_BLH_H) */ |
| 87 | #endif /* _BLF_H */ |
| 88 | |