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 -------------------------------------------------*/