3 * The Noekeon block cipher
5 * (c) 2001 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Catacomb.
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.
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.
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,
28 /*----- Header files ------------------------------------------------------*/
33 #include <mLib/bits.h>
39 /*----- Global variables --------------------------------------------------*/
41 const octet noekeon_keysz
[] = { KSZ_SET
, NOEKEON_KEYSZ
, 0 };
43 /*----- Magic constants ---------------------------------------------------*/
45 /* --- To generate the magic --- *
47 * perl -e'@@r=();$x=0x80;for(0..16){push(@@r,$x);$x<<=1;$x^=0x11b
48 * if$x&0x100;};print join(", ",map{sprintf"0x%02x",$_}@@r),"\n";'
51 static const octet rcon
[17] = {
52 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a,
53 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a,
57 /*----- Main code ---------------------------------------------------------*/
59 /* --- @noekeon_init@--- *
61 * Arguments: @noekeon_ctx *k@ = pointer to key block to fill in
62 * @const void *buf@ = pointer to buffer of key material
63 * @size_t sz@ = size of key material
67 * Use: Initializes a Noekeon key buffer. Noekeon accepts a 128-bit
71 void noekeon_init(noekeon_ctx
*k
, const void *buf
, size_t sz
)
74 static const noekeon_ctx nullkey
= { { 0, 0, 0, 0 } };
76 KSZ_ASSERT(noekeon
, sz
);
77 k
->k
[0] = LOAD32(p
+ 0);
78 k
->k
[1] = LOAD32(p
+ 4);
79 k
->k
[2] = LOAD32(p
+ 8);
80 k
->k
[3] = LOAD32(p
+ 12);
81 noekeon_eblk(&nullkey
, k
->k
, k
->k
);
84 /* --- @noekeon_eblk@, @noekeon_dblk@ --- *
86 * Arguments: @const noekeon_ctx *k@ = pointer to key block
87 * @const uint32 s[2]@ = pointer to source block
88 * @uint32 d[2]@ = pointer to destination block
92 * Use: Low-level block encryption and decryption.
95 #define GAMMA(a, b, c, d) do { \
97 b ^= ~(c | d); a ^= b & c; \
98 _x = d; d = a; a = _x; \
100 b ^= ~(c | d); a ^= b & c; \
103 #define THETA(ka, kb, kc, kd, a, b, c, d) do { \
105 _x = a ^ c; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); b ^= _x; d ^= _x; \
106 a ^= ka; b ^= kb; c ^= kc; d ^= kd; \
107 _x = b ^ d; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); a ^= _x; c ^= _x; \
110 #define ITHETA(ka, kb, kc, kd, a, b, c, d) do { \
112 _x = b ^ d; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); a ^= _x; c ^= _x; \
113 a ^= ka; b ^= kb; c ^= kc; d ^= kd; \
114 _x = a ^ c; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); b ^= _x; d ^= _x; \
117 #define PI1(a, b, c, d) do { \
118 b = ROL32(b, 1); c = ROL32(c, 5); d = ROL32(d, 2); \
121 #define PI2(a, b, c, d) do { \
122 b = ROR32(b, 1); c = ROR32(c, 5); d = ROR32(d, 2); \
125 #define ROUND(r, ka, kb, kc, kd, a, b, c, d) do { \
126 a ^= *r++; THETA(ka, kb, kc, kd, a, b, c, d); \
127 PI1(a, b, c, d); GAMMA(a, b, c, d); PI2(a, b, c, d); \
130 #define IROUND(r, ka, kb, kc, kd, a, b, c, d) do { \
131 ITHETA(ka, kb, kc, kd, a, b, c, d); a ^= *--r; \
132 PI1(a, b, c, d); GAMMA(a, b, c, d); PI2(a, b, c, d); \
135 void noekeon_eblk(const noekeon_ctx
*k
, const uint32
*src
, uint32
*dst
)
137 uint32 ka
= k
->k
[0], kb
= k
->k
[1], kc
= k
->k
[2], kd
= k
->k
[3];
138 uint32 a
= src
[0], b
= src
[1], c
= src
[2], d
= src
[3];
139 const octet
*r
= rcon
;
141 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
142 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
143 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
144 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
145 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
146 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
147 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
148 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
149 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
150 ROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
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
);
158 a
^= *r
++; THETA(ka
, kb
, kc
, kd
, a
, b
, c
, d
);
160 dst
[0] = a
; dst
[1] = b
; dst
[2] = c
; dst
[3] = d
;
163 void noekeon_dblk(const noekeon_ctx
*k
, const uint32
*src
, uint32
*dst
)
165 uint32 ka
= k
->k
[0], kb
= k
->k
[1], kc
= k
->k
[2], kd
= k
->k
[3];
166 uint32 a
= src
[0], b
= src
[1], c
= src
[2], d
= src
[3];
167 const octet
*r
= rcon
+ sizeof(rcon
);
169 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
170 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
171 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
172 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
173 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
174 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
175 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
176 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
177 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
178 IROUND(r
, ka
, kb
, kc
, kd
, a
, b
, c
, d
);
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
);
186 ITHETA(ka
, kb
, kc
, kd
, a
, b
, c
, d
); a
^= *--r
;
188 dst
[0] = a
; dst
[1] = b
; dst
[2] = c
; dst
[3] = d
;
191 BLKC_TEST(NOEKEON
, noekeon
)
193 /*----- That's all, folks -------------------------------------------------*/