3 * $Id: noekeon.c,v 1.1 2001/05/08 22:17:41 mdw Exp $
5 * The Noekeon block cipher
7 * (c) 2001 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 1.1 2001/05/08 22:17:41 mdw
34 * New cipher Noekeon added.
38 /*----- Header files ------------------------------------------------------*/
43 #include <mLib/bits.h>
49 /*----- Global variables --------------------------------------------------*/
51 const octet noekeon_keysz
[] = { KSZ_SET
, NOEKEON_KEYSZ
, 0 };
53 /*----- Magic constants ---------------------------------------------------*/
55 /* --- To generate the magic --- *
57 * perl -e'@r=();$x=0x80;for(0..16){push(@r,$x);$x<<=1;$x^=0x11b if$x&0x100;}
58 * i;print join(", ",map{sprintf"0x%02x",$_}@r),"\n";'
61 static const octet rcon
[17] = {
62 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a,
63 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a,
67 /*----- Main code ---------------------------------------------------------*/
69 /* --- @noekeon_init@--- *
71 * Arguments: @noekeon_ctx *k@ = pointer to key block to fill in
72 * @const void *buf@ = pointer to buffer of key material
73 * @size_t sz@ = size of key material
77 * Use: Initializes a Noekeon key buffer. Noekeon accepts a 128-bit
81 void noekeon_init(noekeon_ctx
*k
, const void *buf
, size_t sz
)
84 static const noekeon_ctx nullkey
= { { 0, 0, 0, 0 } };
86 KSZ_ASSERT(noekeon
, sz
);
87 k
->k
[0] = LOAD32(p
+ 0);
88 k
->k
[1] = LOAD32(p
+ 4);
89 k
->k
[2] = LOAD32(p
+ 8);
90 k
->k
[3] = LOAD32(p
+ 12);
91 noekeon_eblk(&nullkey
, k
->k
, k
->k
);
94 /* --- @noekeon_eblk@, @noekeon_dblk@ --- *
96 * Arguments: @const noekeon_ctx *k@ = pointer to key block
97 * @const uint32 s[2]@ = pointer to source block
98 * @uint32 d[2]@ = pointer to destination block
102 * Use: Low-level block encryption and decryption.
105 #define GAMMA(a, b, c, d) do { \
107 b ^= ~(c | d); a ^= b & c; \
108 _x = d; d = a; a = _x; \
110 b ^= ~(c | d); a ^= b & c; \
113 #define THETA(ka, kb, kc, kd, a, b, c, d) do { \
115 _x = a ^ c; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); b ^= _x; d ^= _x; \
116 a ^= ka; b ^= kb; c ^= kc; d ^= kd; \
117 _x = b ^ d; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); a ^= _x; c ^= _x; \
120 #define ITHETA(ka, kb, kc, kd, a, b, c, d) do { \
122 _x = b ^ d; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); a ^= _x; c ^= _x; \
123 a ^= ka; b ^= kb; c ^= kc; d ^= kd; \
124 _x = a ^ c; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); b ^= _x; d ^= _x; \
127 #define PI1(a, b, c, d) do { \
128 b = ROL32(b, 1); c = ROL32(c, 5); d = ROL32(d, 2); \
131 #define PI2(a, b, c, d) do { \
132 b = ROR32(b, 1); c = ROR32(c, 5); d = ROR32(d, 2); \
135 #define ROUND(r, ka, kb, kc, kd, a, b, c, d) do { \
136 a ^= *r++; THETA(ka, kb, kc, kd, a, b, c, d); \
137 PI1(a, b, c, d); GAMMA(a, b, c, d); PI2(a, b, c, d); \
140 #define IROUND(r, ka, kb, kc, kd, a, b, c, d) do { \
141 ITHETA(ka, kb, kc, kd, a, b, c, d); a ^= *--r; \
142 PI1(a, b, c, d); GAMMA(a, b, c, d); PI2(a, b, c, d); \
145 void noekeon_eblk(const noekeon_ctx
*k
, const uint32
*src
, uint32
*dst
)
147 uint32 ka
= k
->k
[0], kb
= k
->k
[1], kc
= k
->k
[2], kd
= k
->k
[3];
148 uint32 a
= src
[0], b
= src
[1], c
= src
[2], d
= src
[3];
149 const octet
*r
= rcon
;
151 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
152 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
153 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
154 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
155 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
156 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
157 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
158 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
159 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
160 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
161 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
162 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
163 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
164 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
165 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
166 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
168 a
^= *r
++; THETA(ka
, kb
, kc
, kd
, a
, b
, c
, d
);
170 dst
[0] = a
; dst
[1] = b
; dst
[2] = c
; dst
[3] = d
;
173 void noekeon_dblk(const noekeon_ctx
*k
, const uint32
*src
, uint32
*dst
)
175 uint32 ka
= k
->k
[0], kb
= k
->k
[1], kc
= k
->k
[2], kd
= k
->k
[3];
176 uint32 a
= src
[0], b
= src
[1], c
= src
[2], d
= src
[3];
177 const octet
*r
= rcon
+ sizeof(rcon
);
179 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
180 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
181 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
182 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
183 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
184 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
185 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
186 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
187 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
188 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
189 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
190 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
191 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
192 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
193 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
194 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
196 ITHETA(ka
, kb
, kc
, kd
, a
, b
, c
, d
); a
^= *--r
;
198 dst
[0] = a
; dst
[1] = b
; dst
[2] = c
; dst
[3] = d
;
201 BLKC_TEST(NOEKEON
, noekeon
)
203 /*----- That's all, folks -------------------------------------------------*/