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d03ab969 | 1 | /* -*-c-*- |
2 | * | |
b817bfc6 | 3 | * $Id: blowfish.c,v 1.4 2004/04/08 01:36:15 mdw Exp $ |
d03ab969 | 4 | * |
5 | * The Blowfish block cipher | |
6 | * | |
7 | * (c) 1998 Straylight/Edgeware | |
8 | */ | |
9 | ||
45c0fd36 | 10 | /*----- Licensing notice --------------------------------------------------* |
d03ab969 | 11 | * |
12 | * This file is part of Catacomb. | |
13 | * | |
14 | * Catacomb is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU Library General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of the | |
17 | * License, or (at your option) any later version. | |
45c0fd36 | 18 | * |
d03ab969 | 19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU Library General Public License for more details. | |
45c0fd36 | 23 | * |
d03ab969 | 24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free | |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
27 | * MA 02111-1307, USA. | |
28 | */ | |
29 | ||
d03ab969 | 30 | /*----- Header files ------------------------------------------------------*/ |
31 | ||
32 | #include <mLib/bits.h> | |
33 | ||
34 | #include "blowfish.h" | |
2e6a5ab5 | 35 | #include "blowfish-tab.h" |
d03ab969 | 36 | #include "blkc.h" |
2e6a5ab5 | 37 | #include "gcipher.h" |
d03ab969 | 38 | #include "paranoia.h" |
39 | ||
40 | /*----- Global variables --------------------------------------------------*/ | |
41 | ||
4e66da02 | 42 | static const blowfish_ctx ikey = BLOWFISH_IKEY; |
d03ab969 | 43 | |
2e6a5ab5 | 44 | const octet blowfish_keysz[] = { KSZ_RANGE, BLOWFISH_KEYSZ, 1, 56, 1 }; |
45 | ||
d03ab969 | 46 | /*----- Macros ------------------------------------------------------------*/ |
47 | ||
2e6a5ab5 | 48 | #define ROUND(k, x, y, r) do { \ |
49 | x ^= *r; \ | |
50 | y ^= ((k->s0[U8(x >> 24)] + \ | |
51 | k->s1[U8(x >> 16)]) ^ \ | |
45c0fd36 MW |
52 | k->s2[U8(x >> 8)]) + \ |
53 | k->s3[U8(x >> 0)]; \ | |
2e6a5ab5 | 54 | } while (0) |
d03ab969 | 55 | |
56 | #define EBLK(k, a, b, c, d) do { \ | |
2e6a5ab5 | 57 | const uint32 *_r = k->p; \ |
58 | uint32 _x = a; \ | |
59 | uint32 _y = b; \ | |
60 | ROUND(k, _x, _y, _r++); \ | |
61 | ROUND(k, _y, _x, _r++); \ | |
62 | ROUND(k, _x, _y, _r++); \ | |
63 | ROUND(k, _y, _x, _r++); \ | |
64 | ROUND(k, _x, _y, _r++); \ | |
65 | ROUND(k, _y, _x, _r++); \ | |
66 | ROUND(k, _x, _y, _r++); \ | |
67 | ROUND(k, _y, _x, _r++); \ | |
68 | ROUND(k, _x, _y, _r++); \ | |
69 | ROUND(k, _y, _x, _r++); \ | |
70 | ROUND(k, _x, _y, _r++); \ | |
71 | ROUND(k, _y, _x, _r++); \ | |
72 | ROUND(k, _x, _y, _r++); \ | |
73 | ROUND(k, _y, _x, _r++); \ | |
74 | ROUND(k, _x, _y, _r++); \ | |
75 | ROUND(k, _y, _x, _r++); \ | |
76 | c = _y ^ k->p[17]; \ | |
77 | d = _x ^ k->p[16]; \ | |
d03ab969 | 78 | } while (0) |
79 | ||
80 | #define DBLK(k, a, b, c, d) do { \ | |
2e6a5ab5 | 81 | const uint32 *_r = k->p + 18; \ |
82 | uint32 _x = a; \ | |
83 | uint32 _y = b; \ | |
84 | ROUND(k, _x, _y, --_r); \ | |
85 | ROUND(k, _y, _x, --_r); \ | |
86 | ROUND(k, _x, _y, --_r); \ | |
87 | ROUND(k, _y, _x, --_r); \ | |
88 | ROUND(k, _x, _y, --_r); \ | |
89 | ROUND(k, _y, _x, --_r); \ | |
90 | ROUND(k, _x, _y, --_r); \ | |
91 | ROUND(k, _y, _x, --_r); \ | |
92 | ROUND(k, _x, _y, --_r); \ | |
93 | ROUND(k, _y, _x, --_r); \ | |
94 | ROUND(k, _x, _y, --_r); \ | |
95 | ROUND(k, _y, _x, --_r); \ | |
96 | ROUND(k, _x, _y, --_r); \ | |
97 | ROUND(k, _y, _x, --_r); \ | |
98 | ROUND(k, _x, _y, --_r); \ | |
99 | ROUND(k, _y, _x, --_r); \ | |
100 | c = _y ^ k->p[0]; \ | |
101 | d = _x ^ k->p[1]; \ | |
d03ab969 | 102 | } while (0) |
103 | ||
104 | /*----- Low-level encryption interface ------------------------------------*/ | |
105 | ||
106 | /* --- @blowfish_init@ --- * | |
107 | * | |
108 | * Arguments: @blowfish_ctx *k@ = pointer to key block to fill in | |
109 | * @const void *buf@ = pointer to buffer of key material | |
110 | * @size_t sz@ = size of key material | |
111 | * | |
112 | * Returns: --- | |
113 | * | |
114 | * Use: Initializes a Blowfish key buffer. Blowfish accepts | |
115 | * a more-or-less arbitrary size key. | |
116 | */ | |
117 | ||
118 | void blowfish_init(blowfish_ctx *k, const void *buf, size_t sz) | |
119 | { | |
2e6a5ab5 | 120 | KSZ_ASSERT(blowfish, sz); |
121 | ||
d03ab969 | 122 | /* --- Copy the initial value over --- */ |
123 | ||
124 | memcpy(k, &ikey, sizeof(ikey)); | |
125 | ||
126 | /* --- Initialize the %$P$% array --- */ | |
127 | ||
128 | { | |
129 | const octet *p = buf; | |
130 | const octet *q = p + sz; | |
131 | int i = 0, j = 0; | |
132 | uint32 x = 0; | |
133 | ||
134 | while (i < 18) { | |
135 | x = (x << 8) | U8(*p++); | |
136 | if (p >= q) | |
137 | p = buf; | |
138 | if (++j >= 4) { | |
139 | k->p[i++] ^= x; | |
140 | x = 0; | |
141 | j = 0; | |
142 | } | |
143 | } | |
144 | ||
145 | x = 0; | |
146 | } | |
147 | ||
148 | /* --- Now mangle the complete array of keys --- */ | |
149 | ||
150 | { | |
151 | uint32 b[2]; | |
152 | int i; | |
153 | ||
154 | b[0] = b[1] = 0; | |
155 | ||
156 | for (i = 0; i < 18; i += 2) { | |
157 | blowfish_eblk(k, b, b); | |
158 | k->p[i] = b[0]; k->p[i + 1] = b[1]; | |
159 | } | |
160 | ||
161 | for (i = 0; i < 256; i += 2) { | |
162 | blowfish_eblk(k, b, b); | |
163 | k->s0[i] = b[0]; k->s0[i + 1] = b[1]; | |
164 | } | |
165 | ||
166 | for (i = 0; i < 256; i += 2) { | |
167 | blowfish_eblk(k, b, b); | |
168 | k->s1[i] = b[0]; k->s1[i + 1] = b[1]; | |
169 | } | |
170 | ||
171 | for (i = 0; i < 256; i += 2) { | |
172 | blowfish_eblk(k, b, b); | |
173 | k->s2[i] = b[0]; k->s2[i + 1] = b[1]; | |
174 | } | |
175 | ||
176 | for (i = 0; i < 256; i += 2) { | |
177 | blowfish_eblk(k, b, b); | |
178 | k->s3[i] = b[0]; k->s3[i + 1] = b[1]; | |
179 | } | |
180 | ||
181 | BURN(b); | |
182 | } | |
183 | } | |
184 | ||
185 | /* --- @blowfish_eblk@, @blowfish_dblk@ --- * | |
186 | * | |
187 | * Arguments: @const blowfish_ctx *k@ = pointer to key block | |
188 | * @const uint32 s[2]@ = pointer to source block | |
189 | * @uint32 d[2]@ = pointer to destination block | |
190 | * | |
191 | * Returns: --- | |
192 | * | |
193 | * Use: Low-level block encryption and decryption. | |
194 | */ | |
195 | ||
196 | void blowfish_eblk(const blowfish_ctx *k, const uint32 *s, uint32 *d) | |
197 | { | |
198 | EBLK(k, s[0], s[1], d[0], d[1]); | |
199 | } | |
200 | ||
201 | void blowfish_dblk(const blowfish_ctx *k, const uint32 *s, uint32 *d) | |
202 | { | |
203 | DBLK(k, s[0], s[1], d[0], d[1]); | |
204 | } | |
205 | ||
206 | BLKC_TEST(BLOWFISH, blowfish) | |
207 | ||
208 | /*----- That's all, folks -------------------------------------------------*/ |