3 * The SAFER 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 #include "safer-tab.h"
41 /*----- Global variables --------------------------------------------------*/
43 const octet safer_keysz
[] = { KSZ_SET
, 8, 16, 0 };
45 /*----- Important tables --------------------------------------------------*/
47 static const octet s
[265] = SAFER_S
, si
[256] = SAFER_SI
;
49 /*----- Main code ---------------------------------------------------------*/
51 /* --- @safer_setup@ --- *
53 * Arguments: @safer_ctx *k@ = pointer to context to initialize
54 * @unsigned r@ = number of rounds wanted
55 * @unsigned f@ = various other flags
56 * @const void *buf@ = pointer to key material
57 * @size_t sz@ = size of key material in bytes
61 * Use: Initializes an SAFER expanded key. A default number of
62 * rounds is chosen, based on the key length.
70 static void init(struct ksched
*t
, const octet
*k
)
76 static void init_sk(struct ksched
*t
, const octet
*k
)
81 for (x
= 0, i
= 0; i
< 8; x
^= k
[i
++])
87 static void next(struct ksched
*t
, octet
*k
)
93 for (i
= 0; i
< 8; i
++)
94 k
[i
] += s
[s
[U8(9*t
->i
+ i
+ 1)]];
97 for (i
= 0; i
< 8; i
++)
98 t
->x
[i
] = ROL8(t
->x
[i
], 3);
102 static void next_sk(struct ksched
*t
, octet
*k
)
108 memcpy(k
, t
->x
+ i
, 8);
110 memcpy(k
, t
->x
+ i
, 9 - i
);
111 memcpy(k
+ 9 - i
, t
->x
, i
- 1);
114 for (i
= 0; i
< 8; i
++)
115 k
[i
] += s
[s
[U8(9*t
->i
+ i
+ 1)]];
118 for (i
= 0; i
< 9; i
++)
119 t
->x
[i
] = ROL8(t
->x
[i
], 3);
123 void safer_setup(safer_ctx
*k
, unsigned r
, unsigned f
,
124 const void *buf
, size_t sz
)
126 struct ksched ka
, kb
;
127 void (*in
)(struct ksched
*, const octet
*);
128 void (*nx
)(struct ksched
*, octet
*);
131 assert(r
<= SAFER_MAXROUNDS
);
132 KSZ_ASSERT(safer
, sz
);
143 in(&ka
, sz
== 8 ? buf
: (const octet
*)buf
+ 8);
148 nx(&ka
, kk
); nx(&kb
, 0); kk
+= 8;
149 nx(&kb
, kk
); nx(&ka
, 0); kk
+= 8;
152 nx(&ka
, kk
); kk
+= 8;
155 /* --- @safer_init@, @safersk_init@ --- *
157 * Arguments: @safer_ctx *k@ = pointer to context to initialize
158 * @const void *buf@ = pointer to key material
159 * @size_t sz@ = size of key material in bytes
163 * Use: Initializes an SAFER expanded key. A default number of
164 * rounds is chosen, based on the key length.
167 void safer_init(safer_ctx
*k
, const void *buf
, size_t sz
)
169 safer_setup(k
, sz
== 8 ?
6 : 10, 0, buf
, sz
);
172 void safersk_init(safer_ctx
*k
, const void *buf
, size_t sz
)
174 safer_setup(k
, sz
== 8 ?
8 : 10, SAFER_SK
, buf
, sz
);
177 /* --- @safer_eblk@, @safer_dblk@ --- *
179 * Arguments: @const safer_ctx *k@ = pointer to SAFER context
180 * @const uint32 s[2]@ = pointer to source block
181 * @const uint32 d[2]@ = pointer to destination block
185 * Use: Low-level block encryption and decryption.
188 #define UNPACK(src, a, b, c, d, e, f, g, h) do { \
189 a = U8(src[0] >> 24); b = U8(src[0] >> 16); \
190 c = U8(src[0] >> 8); d = U8(src[0] >> 0); \
191 e = U8(src[1] >> 24); f = U8(src[1] >> 16); \
192 g = U8(src[1] >> 8); h = U8(src[1] >> 0); \
195 #define PACK(dst, a, b, c, d, e, f, g, h) do { \
196 dst[0] = (U8(a) << 24) | (U8(b) << 16) | (U8(c) << 8) | U8(d); \
197 dst[1] = (U8(e) << 24) | (U8(f) << 16) | (U8(g) << 8) | U8(h); \
200 #define F(x, y) y += x, x += y
201 #define G(x, y) x -= y, y -= x
203 #define PHT(a, b, c, d, e, f, g, h) do { \
204 F(a, b); F(c, d); F(e, f); F(g, h); \
205 F(a, c); F(e, g); F(b, d); F(f, h); \
206 F(a, e); F(b, f); F(c, g); F(d, h); \
208 #define IPHT(a, b, c, d, e, f, g, h) do { \
209 G(a, e); G(b, f); G(c, g); G(d, h); \
210 G(a, c); G(e, g); G(b, d); G(f, h); \
211 G(a, b); G(c, d); G(e, f); G(g, h); \
214 #define KXA(k, a, b, c, d, e, f, g, h) do { \
215 a ^= *k++; b += *k++; c += *k++; d ^= *k++; \
216 e ^= *k++; f += *k++; g += *k++; h ^= *k++; \
218 #define SUB(a, b, c, d, e, f, g, h) do { \
219 a = s[U8(a)]; b = si[U8(b)]; c = si[U8(c)]; d = s[U8(d)]; \
220 e = s[U8(e)]; f = si[U8(f)]; g = si[U8(g)]; h = s[U8(h)]; \
222 #define KAX(k, a, b, c, d, e, f, g, h) do { \
223 a += *k++; b ^= *k++; c ^= *k++; d += *k++; \
224 e += *k++; f ^= *k++; g ^= *k++; h += *k++; \
227 #define KXS(k, a, b, c, d, e, f, g, h) do { \
228 h ^= *--k; g -= *--k; f -= *--k; e ^= *--k; \
229 d ^= *--k; c -= *--k; b -= *--k; a ^= *--k; \
231 #define ISUB(a, b, c, d, e, f, g, h) do { \
232 a = si[U8(a)]; b = s[U8(b)]; c = s[U8(c)]; d = si[U8(d)]; \
233 e = si[U8(e)]; f = s[U8(f)]; g = s[U8(g)]; h = si[U8(h)]; \
235 #define KSX(k, a, b, c, d, e, f, g, h) do { \
236 h -= *--k; g ^= *--k; f ^= *--k; e -= *--k; \
237 d -= *--k; c ^= *--k; b ^= *--k; a -= *--k; \
240 #define EROUND(k, a, b, c, d, e, f, g, h) do { \
241 KXA(k, a, b, c, d, e, f, g, h); \
242 SUB(a, b, c, d, e, f, g, h); \
243 KAX(k, a, b, c, d, e, f, g, h); \
244 PHT(a, b, c, d, e, f, g, h); \
247 #define DROUND(k, a, b, c, d, e, f, g, h) do { \
248 IPHT(a, b, c, d, e, f, g, h); \
249 KSX(k, a, b, c, d, e, f, g, h); \
250 ISUB(a, b, c, d, e, f, g, h); \
251 KXS(k, a, b, c, d, e, f, g, h); \
255 void safer_eblk(const safer_ctx
*k
, const uint32
*src
, uint32
*dst
)
257 octet a
, b
, c
, d
, e
, f
, g
, h
;
259 const octet
*kk
= k
->k
;
261 UNPACK(src
, a
, b
, c
, d
, e
, f
, g
, h
);
263 EROUND(kk
, a
, b
, c
, d
, e
, f
, g
, h
);
264 EROUND(kk
, a
, e
, b
, f
, c
, g
, d
, h
);
265 EROUND(kk
, a
, c
, e
, g
, b
, d
, f
, h
);
270 KXA(kk
, a
, b
, c
, d
, e
, f
, g
, h
);
271 PACK(dst
, a
, b
, c
, d
, e
, f
, g
,h
);
274 EROUND(kk
, a
, b
, c
, d
, e
, f
, g
, h
);
275 KXA(kk
, a
, e
, b
, f
, c
, g
, d
, h
);
276 PACK(dst
, a
, e
, b
, f
, c
, g
, d
, h
);
279 EROUND(kk
, a
, b
, c
, d
, e
, f
, g
, h
);
280 EROUND(kk
, a
, e
, b
, f
, c
, g
, d
, h
);
281 KXA(kk
, a
, c
, e
, g
, b
, d
, f
, h
);
282 PACK(dst
, a
, c
, e
, g
, b
, d
, f
, h
);
287 void safer_dblk(const safer_ctx
*k
, const uint32
*src
, uint32
*dst
)
289 octet a
, b
, c
, d
, e
, f
, g
, h
;
291 const octet
*kk
= k
->k
+ 16 * r
+ 8;
295 UNPACK(src
, a
, b
, c
, d
, e
, f
, g
, h
);
296 KXS(kk
, a
, b
, c
, d
, e
, f
, g
, h
);
299 UNPACK(src
, a
, e
, b
, f
, c
, g
, d
, h
);
300 KXS(kk
, a
, e
, b
, f
, c
, g
, d
, h
);
304 UNPACK(src
, a
, c
, e
, g
, b
, d
, f
, h
);
305 KXS(kk
, a
, c
, e
, g
, b
, d
, f
, h
);
307 DROUND(kk
, a
, e
, b
, f
, c
, g
, d
, h
);
309 DROUND(kk
, a
, b
, c
, d
, e
, f
, g
, h
);
313 DROUND(kk
, a
, c
, e
, g
, b
, d
, f
, h
);
314 DROUND(kk
, a
, e
, b
, f
, c
, g
, d
, h
);
315 DROUND(kk
, a
, b
, c
, d
, e
, f
, g
, h
);
318 PACK(dst
, a
, b
, c
, d
, e
, f
, g
, h
);
321 BLKC_TEST(SAFER
, safer
)
323 /*----- That's all, folks -------------------------------------------------*/