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d03ab969 | 1 | /* -*-c-*- |
2 | * | |
b817bfc6 | 3 | * $Id: des3.c,v 1.3 2004/04/08 01:36:15 mdw Exp $ |
d03ab969 | 4 | * |
5 | * Implementation of double- and triple-DES | |
6 | * | |
7 | * (c) 1999 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 <assert.h> | |
33 | #include <stdio.h> | |
34 | #include <stdlib.h> | |
35 | #include <string.h> | |
36 | ||
37 | #include <mLib/bits.h> | |
38 | ||
39 | #include "blkc.h" | |
40 | #include "des-base.h" | |
41 | #include "des.h" | |
42 | #include "des3.h" | |
89ae755d | 43 | #include "gcipher.h" |
44 | ||
45 | /*----- Global variables --------------------------------------------------*/ | |
46 | ||
47 | const octet des3_keysz[] = { KSZ_SET, 21, 7, 8, 14, 16, 24, 0 }; | |
d03ab969 | 48 | |
49 | /*----- Main code ---------------------------------------------------------*/ | |
50 | ||
51 | /* --- @des3_init@ --- * | |
52 | * | |
53 | * Arguments: @des3_ctx *k@ = pointer to key block | |
54 | * @const void *buf@ = pointer to key buffer | |
55 | * @size_t sz@ = size of key material | |
56 | * | |
57 | * Returns: --- | |
58 | * | |
59 | * Use: Initializes a DES key buffer. The key buffer may have length | |
45c0fd36 MW |
60 | * 7, 8, 14, 16, 21, or 24. These correspond to one, two or |
61 | * three DES keys, either packed or unpacked (i.e., still | |
62 | * containing parity bits). | |
d03ab969 | 63 | */ |
64 | ||
65 | void des3_init(des3_ctx *k, const void *buf, size_t sz) | |
66 | { | |
67 | size_t step; | |
68 | const octet *p = buf; | |
69 | ||
89ae755d | 70 | KSZ_ASSERT(des3, sz); |
d03ab969 | 71 | |
72 | if (sz % 7 == 0) | |
73 | step = 7; | |
74 | else | |
75 | step = 8; | |
76 | ||
77 | des_init(&k->a, p, step); | |
78 | if (sz > 8) p += step; | |
79 | des_init(&k->b, p, step); | |
80 | if (sz > 16) p += step; else p = buf; | |
81 | des_init(&k->c, p, step); | |
82 | } | |
83 | ||
84 | /* --- @des3_eblk@, @des3_dblk@ --- * | |
85 | * | |
86 | * Arguments: @const des3_ctx *k@ = pointer to key block | |
87 | * @const uint32 s[2]@ = pointer to source block | |
88 | * @uint32 d[2]@ = pointer to destination block | |
89 | * | |
90 | * Returns: --- | |
91 | * | |
92 | * Use: Low-level block encryption and decryption. | |
93 | */ | |
94 | ||
95 | void des3_eblk(const des3_ctx *k, const uint32 *s, uint32 *d) | |
96 | { | |
97 | uint32 x = s[0], y = s[1]; | |
98 | DES_IP(x, y); | |
99 | DES_EBLK(k->a.k, x, y, x, y); | |
100 | DES_DBLK(k->b.k, x, y, x, y); | |
101 | DES_EBLK(k->c.k, x, y, x, y); | |
102 | DES_IPINV(x, y); | |
103 | d[0] = x, d[1] = y; | |
104 | } | |
105 | ||
106 | void des3_dblk(const des3_ctx *k, const uint32 *s, uint32 *d) | |
107 | { | |
108 | uint32 x = s[0], y = s[1]; | |
109 | DES_IP(x, y); | |
110 | DES_DBLK(k->c.k, x, y, x, y); | |
111 | DES_EBLK(k->b.k, x, y, x, y); | |
112 | DES_DBLK(k->a.k, x, y, x, y); | |
113 | DES_IPINV(x, y); | |
114 | d[0] = x, d[1] = y; | |
115 | } | |
116 | ||
117 | BLKC_TEST(DES3, des3) | |
118 | ||
119 | /*----- That's all, folks -------------------------------------------------*/ |