3 * $Id: des3.c,v 1.2 2000/06/17 10:52:32 mdw Exp $
5 * Implementation of double- and triple-DES
7 * (c) 1999 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
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.
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.
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,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.2 2000/06/17 10:52:32 mdw
34 * Support new key size interface.
36 * Revision 1.1 1999/09/03 08:41:11 mdw
41 /*----- Header files ------------------------------------------------------*/
48 #include <mLib/bits.h>
56 /*----- Global variables --------------------------------------------------*/
58 const octet des3_keysz[] = { KSZ_SET, 21, 7, 8, 14, 16, 24, 0 };
60 /*----- Main code ---------------------------------------------------------*/
62 /* --- @des3_init@ --- *
64 * Arguments: @des3_ctx *k@ = pointer to key block
65 * @const void *buf@ = pointer to key buffer
66 * @size_t sz@ = size of key material
70 * Use: Initializes a DES key buffer. The key buffer may have length
71 * 7, 8, 14, 16, 21, or 24. These correspond to one, two or
72 * three DES keys, either packed or unpacked (i.e., still
73 * containing parity bits).
76 void des3_init(des3_ctx *k, const void *buf, size_t sz)
88 des_init(&k->a, p, step);
89 if (sz > 8) p += step;
90 des_init(&k->b, p, step);
91 if (sz > 16) p += step; else p = buf;
92 des_init(&k->c, p, step);
95 /* --- @des3_eblk@, @des3_dblk@ --- *
97 * Arguments: @const des3_ctx *k@ = pointer to key block
98 * @const uint32 s[2]@ = pointer to source block
99 * @uint32 d[2]@ = pointer to destination block
103 * Use: Low-level block encryption and decryption.
106 void des3_eblk(const des3_ctx *k, const uint32 *s, uint32 *d)
108 uint32 x = s[0], y = s[1];
110 DES_EBLK(k->a.k, x, y, x, y);
111 DES_DBLK(k->b.k, x, y, x, y);
112 DES_EBLK(k->c.k, x, y, x, y);
117 void des3_dblk(const des3_ctx *k, const uint32 *s, uint32 *d)
119 uint32 x = s[0], y = s[1];
121 DES_DBLK(k->c.k, x, y, x, y);
122 DES_EBLK(k->b.k, x, y, x, y);
123 DES_DBLK(k->a.k, x, y, x, y);
128 BLKC_TEST(DES3, des3)
130 /*----- That's all, folks -------------------------------------------------*/