2 * Blowfish - a fast block cipher designed by Bruce Schneier
4 * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Niels Provos.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 * FreeBSD implementation by Paul Herman <pherman@frenchfries.net>
42 /* Schneier states the maximum key length to be 56 bytes.
43 * The way how the subkeys are initalized by the key up
44 * to (N+2)*4 i.e. 72 bytes are utilized.
45 * Warning: For normal blowfish encryption only 56 bytes
46 * of the key affect all cipherbits.
49 #define BLF_N 16 /* Number of Subkeys */
50 #define BLF_MAXKEYLEN ((BLF_N-2)*4) /* 448 bits */
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 */
58 /* Raw access to customized Blowfish
60 * Blowfish_initstate( state )
61 * Blowfish_expand0state( state, key, keylen )
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);
71 /* Standard Blowfish */
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);
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);
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);
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 *);