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d03ab969 | 1 | /* -*-c-*- |
d03ab969 | 2 | * |
3 | * The Blowfish block cipher | |
4 | * | |
5 | * (c) 1998 Straylight/Edgeware | |
6 | */ | |
7 | ||
45c0fd36 | 8 | /*----- Licensing notice --------------------------------------------------* |
d03ab969 | 9 | * |
10 | * This file is part of Catacomb. | |
11 | * | |
12 | * Catacomb is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU Library General Public License as | |
14 | * published by the Free Software Foundation; either version 2 of the | |
15 | * License, or (at your option) any later version. | |
45c0fd36 | 16 | * |
d03ab969 | 17 | * Catacomb is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU Library General Public License for more details. | |
45c0fd36 | 21 | * |
d03ab969 | 22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free | |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
25 | * MA 02111-1307, USA. | |
26 | */ | |
27 | ||
d03ab969 | 28 | /*----- Header files ------------------------------------------------------*/ |
29 | ||
30 | #include <mLib/bits.h> | |
31 | ||
32 | #include "blowfish.h" | |
d03ab969 | 33 | #include "blkc.h" |
2e6a5ab5 | 34 | #include "gcipher.h" |
d03ab969 | 35 | #include "paranoia.h" |
36 | ||
37 | /*----- Global variables --------------------------------------------------*/ | |
38 | ||
e5b61a8d | 39 | extern const blowfish_ctx blowfish_ikey; |
d03ab969 | 40 | |
2e6a5ab5 | 41 | const octet blowfish_keysz[] = { KSZ_RANGE, BLOWFISH_KEYSZ, 1, 56, 1 }; |
42 | ||
d03ab969 | 43 | /*----- Macros ------------------------------------------------------------*/ |
44 | ||
2e6a5ab5 | 45 | #define ROUND(k, x, y, r) do { \ |
46 | x ^= *r; \ | |
47 | y ^= ((k->s0[U8(x >> 24)] + \ | |
48 | k->s1[U8(x >> 16)]) ^ \ | |
45c0fd36 MW |
49 | k->s2[U8(x >> 8)]) + \ |
50 | k->s3[U8(x >> 0)]; \ | |
2e6a5ab5 | 51 | } while (0) |
d03ab969 | 52 | |
53 | #define EBLK(k, a, b, c, d) do { \ | |
2e6a5ab5 | 54 | const uint32 *_r = k->p; \ |
55 | uint32 _x = a; \ | |
56 | uint32 _y = b; \ | |
57 | ROUND(k, _x, _y, _r++); \ | |
58 | ROUND(k, _y, _x, _r++); \ | |
59 | ROUND(k, _x, _y, _r++); \ | |
60 | ROUND(k, _y, _x, _r++); \ | |
61 | ROUND(k, _x, _y, _r++); \ | |
62 | ROUND(k, _y, _x, _r++); \ | |
63 | ROUND(k, _x, _y, _r++); \ | |
64 | ROUND(k, _y, _x, _r++); \ | |
65 | ROUND(k, _x, _y, _r++); \ | |
66 | ROUND(k, _y, _x, _r++); \ | |
67 | ROUND(k, _x, _y, _r++); \ | |
68 | ROUND(k, _y, _x, _r++); \ | |
69 | ROUND(k, _x, _y, _r++); \ | |
70 | ROUND(k, _y, _x, _r++); \ | |
71 | ROUND(k, _x, _y, _r++); \ | |
72 | ROUND(k, _y, _x, _r++); \ | |
73 | c = _y ^ k->p[17]; \ | |
74 | d = _x ^ k->p[16]; \ | |
d03ab969 | 75 | } while (0) |
76 | ||
77 | #define DBLK(k, a, b, c, d) do { \ | |
2e6a5ab5 | 78 | const uint32 *_r = k->p + 18; \ |
79 | uint32 _x = a; \ | |
80 | uint32 _y = b; \ | |
81 | ROUND(k, _x, _y, --_r); \ | |
82 | ROUND(k, _y, _x, --_r); \ | |
83 | ROUND(k, _x, _y, --_r); \ | |
84 | ROUND(k, _y, _x, --_r); \ | |
85 | ROUND(k, _x, _y, --_r); \ | |
86 | ROUND(k, _y, _x, --_r); \ | |
87 | ROUND(k, _x, _y, --_r); \ | |
88 | ROUND(k, _y, _x, --_r); \ | |
89 | ROUND(k, _x, _y, --_r); \ | |
90 | ROUND(k, _y, _x, --_r); \ | |
91 | ROUND(k, _x, _y, --_r); \ | |
92 | ROUND(k, _y, _x, --_r); \ | |
93 | ROUND(k, _x, _y, --_r); \ | |
94 | ROUND(k, _y, _x, --_r); \ | |
95 | ROUND(k, _x, _y, --_r); \ | |
96 | ROUND(k, _y, _x, --_r); \ | |
97 | c = _y ^ k->p[0]; \ | |
98 | d = _x ^ k->p[1]; \ | |
d03ab969 | 99 | } while (0) |
100 | ||
101 | /*----- Low-level encryption interface ------------------------------------*/ | |
102 | ||
103 | /* --- @blowfish_init@ --- * | |
104 | * | |
105 | * Arguments: @blowfish_ctx *k@ = pointer to key block to fill in | |
106 | * @const void *buf@ = pointer to buffer of key material | |
107 | * @size_t sz@ = size of key material | |
108 | * | |
109 | * Returns: --- | |
110 | * | |
111 | * Use: Initializes a Blowfish key buffer. Blowfish accepts | |
112 | * a more-or-less arbitrary size key. | |
113 | */ | |
114 | ||
115 | void blowfish_init(blowfish_ctx *k, const void *buf, size_t sz) | |
116 | { | |
2e6a5ab5 | 117 | KSZ_ASSERT(blowfish, sz); |
118 | ||
d03ab969 | 119 | /* --- Copy the initial value over --- */ |
120 | ||
e5b61a8d | 121 | *k = blowfish_ikey; |
d03ab969 | 122 | |
123 | /* --- Initialize the %$P$% array --- */ | |
124 | ||
125 | { | |
126 | const octet *p = buf; | |
127 | const octet *q = p + sz; | |
128 | int i = 0, j = 0; | |
129 | uint32 x = 0; | |
130 | ||
131 | while (i < 18) { | |
132 | x = (x << 8) | U8(*p++); | |
133 | if (p >= q) | |
134 | p = buf; | |
135 | if (++j >= 4) { | |
136 | k->p[i++] ^= x; | |
137 | x = 0; | |
138 | j = 0; | |
139 | } | |
140 | } | |
141 | ||
142 | x = 0; | |
143 | } | |
144 | ||
145 | /* --- Now mangle the complete array of keys --- */ | |
146 | ||
147 | { | |
148 | uint32 b[2]; | |
149 | int i; | |
150 | ||
151 | b[0] = b[1] = 0; | |
152 | ||
153 | for (i = 0; i < 18; i += 2) { | |
154 | blowfish_eblk(k, b, b); | |
155 | k->p[i] = b[0]; k->p[i + 1] = b[1]; | |
156 | } | |
157 | ||
158 | for (i = 0; i < 256; i += 2) { | |
159 | blowfish_eblk(k, b, b); | |
160 | k->s0[i] = b[0]; k->s0[i + 1] = b[1]; | |
161 | } | |
162 | ||
163 | for (i = 0; i < 256; i += 2) { | |
164 | blowfish_eblk(k, b, b); | |
165 | k->s1[i] = b[0]; k->s1[i + 1] = b[1]; | |
166 | } | |
167 | ||
168 | for (i = 0; i < 256; i += 2) { | |
169 | blowfish_eblk(k, b, b); | |
170 | k->s2[i] = b[0]; k->s2[i + 1] = b[1]; | |
171 | } | |
172 | ||
173 | for (i = 0; i < 256; i += 2) { | |
174 | blowfish_eblk(k, b, b); | |
175 | k->s3[i] = b[0]; k->s3[i + 1] = b[1]; | |
176 | } | |
177 | ||
178 | BURN(b); | |
179 | } | |
180 | } | |
181 | ||
182 | /* --- @blowfish_eblk@, @blowfish_dblk@ --- * | |
183 | * | |
184 | * Arguments: @const blowfish_ctx *k@ = pointer to key block | |
185 | * @const uint32 s[2]@ = pointer to source block | |
186 | * @uint32 d[2]@ = pointer to destination block | |
187 | * | |
188 | * Returns: --- | |
189 | * | |
190 | * Use: Low-level block encryption and decryption. | |
191 | */ | |
192 | ||
193 | void blowfish_eblk(const blowfish_ctx *k, const uint32 *s, uint32 *d) | |
194 | { | |
195 | EBLK(k, s[0], s[1], d[0], d[1]); | |
196 | } | |
197 | ||
198 | void blowfish_dblk(const blowfish_ctx *k, const uint32 *s, uint32 *d) | |
199 | { | |
200 | DBLK(k, s[0], s[1], d[0], d[1]); | |
201 | } | |
202 | ||
203 | BLKC_TEST(BLOWFISH, blowfish) | |
204 | ||
205 | /*----- That's all, folks -------------------------------------------------*/ |