9ced44c26b182c29e763fec47c7bac57634d0953
3 * $Id: rc2.c,v 1.1 2000/06/17 11:54:34 mdw Exp $
7 * (c) 2000 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 2000/06/17 11:54:34 mdw
38 /*----- Header files ------------------------------------------------------*/
43 #include <mLib/bits.h>
50 /*----- Global variables --------------------------------------------------*/
52 const octet rc2_keysz
[] = { KSZ_RANGE
, RC2_KEYSZ
, 1, 128, 1 };
54 /*----- Important tables --------------------------------------------------*/
56 static const octet pi
[] = {
57 0xd9, 0x78, 0xf9, 0xc4, 0x19, 0xdd, 0xb5, 0xed,
58 0x28, 0xe9, 0xfd, 0x79, 0x4a, 0xa0, 0xd8, 0x9d,
59 0xc6, 0x7e, 0x37, 0x83, 0x2b, 0x76, 0x53, 0x8e,
60 0x62, 0x4c, 0x64, 0x88, 0x44, 0x8b, 0xfb, 0xa2,
61 0x17, 0x9a, 0x59, 0xf5, 0x87, 0xb3, 0x4f, 0x13,
62 0x61, 0x45, 0x6d, 0x8d, 0x09, 0x81, 0x7d, 0x32,
63 0xbd, 0x8f, 0x40, 0xeb, 0x86, 0xb7, 0x7b, 0x0b,
64 0xf0, 0x95, 0x21, 0x22, 0x5c, 0x6b, 0x4e, 0x82,
65 0x54, 0xd6, 0x65, 0x93, 0xce, 0x60, 0xb2, 0x1c,
66 0x73, 0x56, 0xc0, 0x14, 0xa7, 0x8c, 0xf1, 0xdc,
67 0x12, 0x75, 0xca, 0x1f, 0x3b, 0xbe, 0xe4, 0xd1,
68 0x42, 0x3d, 0xd4, 0x30, 0xa3, 0x3c, 0xb6, 0x26,
69 0x6f, 0xbf, 0x0e, 0xda, 0x46, 0x69, 0x07, 0x57,
70 0x27, 0xf2, 0x1d, 0x9b, 0xbc, 0x94, 0x43, 0x03,
71 0xf8, 0x11, 0xc7, 0xf6, 0x90, 0xef, 0x3e, 0xe7,
72 0x06, 0xc3, 0xd5, 0x2f, 0xc8, 0x66, 0x1e, 0xd7,
73 0x08, 0xe8, 0xea, 0xde, 0x80, 0x52, 0xee, 0xf7,
74 0x84, 0xaa, 0x72, 0xac, 0x35, 0x4d, 0x6a, 0x2a,
75 0x96, 0x1a, 0xd2, 0x71, 0x5a, 0x15, 0x49, 0x74,
76 0x4b, 0x9f, 0xd0, 0x5e, 0x04, 0x18, 0xa4, 0xec,
77 0xc2, 0xe0, 0x41, 0x6e, 0x0f, 0x51, 0xcb, 0xcc,
78 0x24, 0x91, 0xaf, 0x50, 0xa1, 0xf4, 0x70, 0x39,
79 0x99, 0x7c, 0x3a, 0x85, 0x23, 0xb8, 0xb4, 0x7a,
80 0xfc, 0x02, 0x36, 0x5b, 0x25, 0x55, 0x97, 0x31,
81 0x2d, 0x5d, 0xfa, 0x98, 0xe3, 0x8a, 0x92, 0xae,
82 0x05, 0xdf, 0x29, 0x10, 0x67, 0x6c, 0xba, 0xc9,
83 0xd3, 0x00, 0xe6, 0xcf, 0xe1, 0x9e, 0xa8, 0x2c,
84 0x63, 0x16, 0x01, 0x3f, 0x58, 0xe2, 0x89, 0xa9,
85 0x0d, 0x38, 0x34, 0x1b, 0xab, 0x33, 0xff, 0xb0,
86 0xbb, 0x48, 0x0c, 0x5f, 0xb9, 0xb1, 0xcd, 0x2e,
87 0xc5, 0xf3, 0xdb, 0x47, 0xe5, 0xa5, 0x9c, 0x77,
88 0x0a, 0xa6, 0x20, 0x68, 0xfe, 0x7f, 0xc1, 0xad
91 /*----- Main code ---------------------------------------------------------*/
93 /* --- @rc2_braindamage@ --- *
95 * Arguments: @rc2_ctx *k@ = pointer to context to initialize
96 * @const void *buf@ = pointer to key material
97 * @size_t sz@ = size of key material in bytes
98 * @unsigned eb@ = desired effective key size, in bits
102 * Use: Initializes an RC2 expanded key, and braindamages it to the
103 * requested effective key size. This is here for compatibility
104 * reasons. You should be using @rc2_init@ in normal code,
105 * which doesn't actually apply braindamage.
108 void rc2_braindamage(rc2_ctx
*k
, const void *buf
, size_t sz
, unsigned eb
)
118 /* --- Compute the braindamage parameters --- */
121 tm
= 0xff & ((1 << (8 + eb
- 8 * t8
)) - 1);
123 /* --- Copy and expand the initial key --- */
129 for (i
= sz
; i
< sizeof(l
); i
++)
130 l
[i
] = pi
[U8(l
[i
- 1] + l
[i
- sz
])];
132 /* --- Braindamage the key --- */
135 l
[i
] = pi
[l
[i
] & tm
];
138 l
[i
] = pi
[U8(l
[i
+ 1] ^ l
[i
+ t8
])];
141 /* --- Write it to the key block --- */
144 for (i
= 0; i
< sizeof(l
); i
+= 2)
145 *kk
++ = LOAD16_L(l
+ i
);
149 /* --- @rc2_init@ --- *
151 * Arguments: @rc2_ctx *k@ = pointer to context to initialize
152 * @const void *buf@ = pointer to key material
153 * @size_t sz@ = size of key material in bytes
157 * Use: Initializes an RC2 expanded key. The effective key size is
158 * set to be equal to the real key size, in bits.
161 void rc2_init(rc2_ctx
*k
, const void *buf
, size_t sz
)
163 rc2_braindamage(k
, buf
, sz
, sz
* 8);
166 /*----- Encryption and decryption -----------------------------------------*/
168 #define MIX(a, b, c, d, r, kk) do { \
169 a += *kk++ + (d & c) + (~d & b); \
173 #define MASH(a, d, k) do { \
177 #define UNMIX(a, b, c, d, r, kk) do { \
179 a -= *--kk + (d & c) + (~d & b); \
182 #define UNMASH(a, d, k) do { \
186 /* --- @rc2_eblk@, @rc2_dblk@ --- *
188 * Arguments: @const rc2_ctx *k@ = pointer to RC2 context
189 * @const uint32 s[2]@ = pointer to source block
190 * @const uint32 d[2]@ = pointer to destination block
194 * Use: Low-level block encryption and decryption.
197 void rc2_eblk(const rc2_ctx
*k
, const uint32
*s
, uint32
*dst
)
199 uint16 a
= U16(s
[0] >> 0), b
= U16(s
[0] >> 16);
200 uint16 c
= U16(s
[1] >> 0), d
= U16(s
[1] >> 16);
201 const uint16
*kk
= k
->k
;
203 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
204 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
205 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
206 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
207 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
208 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
209 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
210 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
211 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
212 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
213 MASH(a
, d
, k
->k
); MASH(b
, a
, k
->k
);
214 MASH(c
, b
, k
->k
); MASH(d
, c
, k
->k
);
215 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
216 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
217 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
218 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
219 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
220 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
221 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
222 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
223 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
224 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
225 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
226 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
227 MASH(a
, d
, k
->k
); MASH(b
, a
, k
->k
);
228 MASH(c
, b
, k
->k
); MASH(d
, c
, k
->k
);
229 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
230 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
231 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
232 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
233 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
234 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
235 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
236 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
237 MIX(a
, b
, c
, d
, 1, kk
); MIX(b
, c
, d
, a
, 2, kk
);
238 MIX(c
, d
, a
, b
, 3, kk
); MIX(d
, a
, b
, c
, 5, kk
);
240 dst
[0] = a
| (b
<< 16); dst
[1] = c
| (d
<< 16);
243 void rc2_dblk(const rc2_ctx
*k
, const uint32
*s
, uint32
*dst
)
245 uint16 a
= U16(s
[0] >> 0), b
= U16(s
[0] >> 16);
246 uint16 c
= U16(s
[1] >> 0), d
= U16(s
[1] >> 16);
247 const uint16
*kk
= k
->k
+ 64;
249 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
250 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
251 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
252 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
253 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
254 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
255 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
256 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
257 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
258 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
259 UNMASH(d
, c
, k
->k
); UNMASH(c
, b
, k
->k
);
260 UNMASH(b
, a
, k
->k
); UNMASH(a
, d
, k
->k
);
261 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
262 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
263 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
264 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
265 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
266 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
267 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
268 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
269 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
270 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
271 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
272 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
273 UNMASH(d
, c
, k
->k
); UNMASH(c
, b
, k
->k
);
274 UNMASH(b
, a
, k
->k
); UNMASH(a
, d
, k
->k
);
275 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
276 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
277 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
278 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
279 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
280 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
281 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
282 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
283 UNMIX(d
, a
, b
, c
, 5, kk
); UNMIX(c
, d
, a
, b
, 3, kk
);
284 UNMIX(b
, c
, d
, a
, 2, kk
); UNMIX(a
, b
, c
, d
, 1, kk
);
286 dst
[0] = a
| (b
<< 16); dst
[1] = c
| (d
<< 16);
289 /*----- Custom test rig ---------------------------------------------------*
291 * I need to test the braindamage feature.
296 #include <mLib/quis.h>
297 #include <mLib/testrig.h>
299 static int verify(dstr
*v
)
302 uint32 p
[RC2_BLKSZ
/ 4];
303 uint32 c
[RC2_BLKSZ
/ 4];
304 uint32 d
[RC2_BLKSZ
/ 4];
306 unsigned bd
= *(unsigned *)v
[1].buf
;
309 /* --- Initialize the key buffer --- */
311 dstr_ensure(&b
, RC2_BLKSZ
);
313 rc2_braindamage(&k
, v
[0].buf
, v
[0].len
, bd
);
314 BLKC_LOAD(RC2
, p
, v
[2].buf
);
315 BLKC_LOAD(RC2
, c
, v
[3].buf
);
317 /* --- Test encryption --- */
319 BLKC_MOVE(RC2
, d
, p
);
321 BLKC_STORE(RC2
, b
.buf
, d
);
322 if (memcmp(b
.buf
, v
[3].buf
, RC2_BLKSZ
)) {
324 printf("\nfail encryption:"
326 type_hex
.dump(&v
[0], stdout
);
327 printf("\n\tbraindamage= %u", bd
);
328 printf("\n\tplaintext = "); type_hex
.dump(&v
[2], stdout
);
329 printf("\n\texpected = "); type_hex
.dump(&v
[3], stdout
);
330 printf("\n\tcalculated = "); type_hex
.dump(&b
, stdout
);
334 /* --- Test decryption --- */
336 BLKC_MOVE(RC2
, d
, c
);
338 BLKC_STORE(RC2
, b
.buf
, d
);
339 if (memcmp(b
.buf
, v
[2].buf
, RC2_BLKSZ
)) {
341 printf("\nfail decryption:"
343 type_hex
.dump(&v
[0], stdout
);
344 printf("\n\tbraindamage= %u", bd
);
345 printf("\n\tciphertext = "); type_hex
.dump(&v
[3], stdout
);
346 printf("\n\texpected = "); type_hex
.dump(&v
[2], stdout
);
347 printf("\n\tcalculated = "); type_hex
.dump(&b
, stdout
);
356 static test_chunk defs
[] = {
357 { "rc2", verify
, { &type_hex
, &type_int
, &type_hex
, &type_hex
, 0 } },
361 int main(int argc
, char *argv
[])
363 test_run(argc
, argv
, defs
, SRCDIR
"/tests/rc2");
369 /*----- That's all, folks -------------------------------------------------*/