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1 | /* Kernel cryptographic api. |
2 | * cast6.c - Cast6 cipher algorithm [rfc2612]. |
3 | * |
4 | * CAST-256 (*cast6*) is a DES like Substitution-Permutation Network (SPN) |
5 | * cryptosystem built upon the CAST-128 (*cast5*) [rfc2144] encryption |
6 | * algorithm. |
7 | * |
8 | * Copyright (C) 2003 Kartikey Mahendra Bhatt <kartik_me@hotmail.com>. |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify it |
11 | * under the terms of GNU General Public License as published by the Free |
12 | * Software Foundation; either version 2 of the License, or (at your option) |
13 | * any later version. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
18 | */ |
19 | |
20 | |
21 | #include <asm/byteorder.h> |
22 | #include <linux/init.h> |
23 | #include <linux/crypto.h> |
24 | #include <linux/module.h> |
25 | #include <linux/errno.h> |
26 | #include <linux/string.h> |
27 | #include <linux/types.h> |
28 | #include <crypto/cast6.h> |
29 | |
30 | #define s1 cast_s1 |
31 | #define s2 cast_s2 |
32 | #define s3 cast_s3 |
33 | #define s4 cast_s4 |
34 | |
35 | #define F1(D, r, m) ((I = ((m) + (D))), (I = rol32(I, (r))), \ |
36 | (((s1[I >> 24] ^ s2[(I>>16)&0xff]) - s3[(I>>8)&0xff]) + s4[I&0xff])) |
37 | #define F2(D, r, m) ((I = ((m) ^ (D))), (I = rol32(I, (r))), \ |
38 | (((s1[I >> 24] - s2[(I>>16)&0xff]) + s3[(I>>8)&0xff]) ^ s4[I&0xff])) |
39 | #define F3(D, r, m) ((I = ((m) - (D))), (I = rol32(I, (r))), \ |
40 | (((s1[I >> 24] + s2[(I>>16)&0xff]) ^ s3[(I>>8)&0xff]) - s4[I&0xff])) |
41 | |
42 | static const u32 Tm[24][8] = { |
43 | { 0x5a827999, 0xc95c653a, 0x383650db, 0xa7103c7c, 0x15ea281d, |
44 | 0x84c413be, 0xf39dff5f, 0x6277eb00 } , |
45 | { 0xd151d6a1, 0x402bc242, 0xaf05ade3, 0x1ddf9984, 0x8cb98525, |
46 | 0xfb9370c6, 0x6a6d5c67, 0xd9474808 } , |
47 | { 0x482133a9, 0xb6fb1f4a, 0x25d50aeb, 0x94aef68c, 0x0388e22d, |
48 | 0x7262cdce, 0xe13cb96f, 0x5016a510 } , |
49 | { 0xbef090b1, 0x2dca7c52, 0x9ca467f3, 0x0b7e5394, 0x7a583f35, |
50 | 0xe9322ad6, 0x580c1677, 0xc6e60218 } , |
51 | { 0x35bfedb9, 0xa499d95a, 0x1373c4fb, 0x824db09c, 0xf1279c3d, |
52 | 0x600187de, 0xcedb737f, 0x3db55f20 } , |
53 | { 0xac8f4ac1, 0x1b693662, 0x8a432203, 0xf91d0da4, 0x67f6f945, |
54 | 0xd6d0e4e6, 0x45aad087, 0xb484bc28 } , |
55 | { 0x235ea7c9, 0x9238936a, 0x01127f0b, 0x6fec6aac, 0xdec6564d, |
56 | 0x4da041ee, 0xbc7a2d8f, 0x2b541930 } , |
57 | { 0x9a2e04d1, 0x0907f072, 0x77e1dc13, 0xe6bbc7b4, 0x5595b355, |
58 | 0xc46f9ef6, 0x33498a97, 0xa2237638 } , |
59 | { 0x10fd61d9, 0x7fd74d7a, 0xeeb1391b, 0x5d8b24bc, 0xcc65105d, |
60 | 0x3b3efbfe, 0xaa18e79f, 0x18f2d340 } , |
61 | { 0x87ccbee1, 0xf6a6aa82, 0x65809623, 0xd45a81c4, 0x43346d65, |
62 | 0xb20e5906, 0x20e844a7, 0x8fc23048 } , |
63 | { 0xfe9c1be9, 0x6d76078a, 0xdc4ff32b, 0x4b29decc, 0xba03ca6d, |
64 | 0x28ddb60e, 0x97b7a1af, 0x06918d50 } , |
65 | { 0x756b78f1, 0xe4456492, 0x531f5033, 0xc1f93bd4, 0x30d32775, |
66 | 0x9fad1316, 0x0e86feb7, 0x7d60ea58 } , |
67 | { 0xec3ad5f9, 0x5b14c19a, 0xc9eead3b, 0x38c898dc, 0xa7a2847d, |
68 | 0x167c701e, 0x85565bbf, 0xf4304760 } , |
69 | { 0x630a3301, 0xd1e41ea2, 0x40be0a43, 0xaf97f5e4, 0x1e71e185, |
70 | 0x8d4bcd26, 0xfc25b8c7, 0x6affa468 } , |
71 | { 0xd9d99009, 0x48b37baa, 0xb78d674b, 0x266752ec, 0x95413e8d, |
72 | 0x041b2a2e, 0x72f515cf, 0xe1cf0170 } , |
73 | { 0x50a8ed11, 0xbf82d8b2, 0x2e5cc453, 0x9d36aff4, 0x0c109b95, |
74 | 0x7aea8736, 0xe9c472d7, 0x589e5e78 } , |
75 | { 0xc7784a19, 0x365235ba, 0xa52c215b, 0x14060cfc, 0x82dff89d, |
76 | 0xf1b9e43e, 0x6093cfdf, 0xcf6dbb80 } , |
77 | { 0x3e47a721, 0xad2192c2, 0x1bfb7e63, 0x8ad56a04, 0xf9af55a5, |
78 | 0x68894146, 0xd7632ce7, 0x463d1888 } , |
79 | { 0xb5170429, 0x23f0efca, 0x92cadb6b, 0x01a4c70c, 0x707eb2ad, |
80 | 0xdf589e4e, 0x4e3289ef, 0xbd0c7590 } , |
81 | { 0x2be66131, 0x9ac04cd2, 0x099a3873, 0x78742414, 0xe74e0fb5, |
82 | 0x5627fb56, 0xc501e6f7, 0x33dbd298 } , |
83 | { 0xa2b5be39, 0x118fa9da, 0x8069957b, 0xef43811c, 0x5e1d6cbd, |
84 | 0xccf7585e, 0x3bd143ff, 0xaaab2fa0 } , |
85 | { 0x19851b41, 0x885f06e2, 0xf738f283, 0x6612de24, 0xd4ecc9c5, |
86 | 0x43c6b566, 0xb2a0a107, 0x217a8ca8 } , |
87 | { 0x90547849, 0xff2e63ea, 0x6e084f8b, 0xdce23b2c, 0x4bbc26cd, |
88 | 0xba96126e, 0x296ffe0f, 0x9849e9b0 } , |
89 | { 0x0723d551, 0x75fdc0f2, 0xe4d7ac93, 0x53b19834, 0xc28b83d5, |
90 | 0x31656f76, 0xa03f5b17, 0x0f1946b8 } |
91 | }; |
92 | |
93 | static const u8 Tr[4][8] = { |
94 | { 0x13, 0x04, 0x15, 0x06, 0x17, 0x08, 0x19, 0x0a } , |
95 | { 0x1b, 0x0c, 0x1d, 0x0e, 0x1f, 0x10, 0x01, 0x12 } , |
96 | { 0x03, 0x14, 0x05, 0x16, 0x07, 0x18, 0x09, 0x1a } , |
97 | { 0x0b, 0x1c, 0x0d, 0x1e, 0x0f, 0x00, 0x11, 0x02 } |
98 | }; |
99 | |
100 | /* forward octave */ |
101 | static inline void W(u32 *key, unsigned int i) |
102 | { |
103 | u32 I; |
104 | key[6] ^= F1(key[7], Tr[i % 4][0], Tm[i][0]); |
105 | key[5] ^= F2(key[6], Tr[i % 4][1], Tm[i][1]); |
106 | key[4] ^= F3(key[5], Tr[i % 4][2], Tm[i][2]); |
107 | key[3] ^= F1(key[4], Tr[i % 4][3], Tm[i][3]); |
108 | key[2] ^= F2(key[3], Tr[i % 4][4], Tm[i][4]); |
109 | key[1] ^= F3(key[2], Tr[i % 4][5], Tm[i][5]); |
110 | key[0] ^= F1(key[1], Tr[i % 4][6], Tm[i][6]); |
111 | key[7] ^= F2(key[0], Tr[i % 4][7], Tm[i][7]); |
112 | } |
113 | |
114 | int __cast6_setkey(struct cast6_ctx *c, const u8 *in_key, |
115 | unsigned key_len, u32 *flags) |
116 | { |
117 | int i; |
118 | u32 key[8]; |
119 | __be32 p_key[8]; /* padded key */ |
120 | |
121 | if (key_len % 4 != 0) { |
122 | *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; |
123 | return -EINVAL; |
124 | } |
125 | |
126 | memset(p_key, 0, 32); |
127 | memcpy(p_key, in_key, key_len); |
128 | |
129 | key[0] = be32_to_cpu(p_key[0]); /* A */ |
130 | key[1] = be32_to_cpu(p_key[1]); /* B */ |
131 | key[2] = be32_to_cpu(p_key[2]); /* C */ |
132 | key[3] = be32_to_cpu(p_key[3]); /* D */ |
133 | key[4] = be32_to_cpu(p_key[4]); /* E */ |
134 | key[5] = be32_to_cpu(p_key[5]); /* F */ |
135 | key[6] = be32_to_cpu(p_key[6]); /* G */ |
136 | key[7] = be32_to_cpu(p_key[7]); /* H */ |
137 | |
138 | for (i = 0; i < 12; i++) { |
139 | W(key, 2 * i); |
140 | W(key, 2 * i + 1); |
141 | |
142 | c->Kr[i][0] = key[0] & 0x1f; |
143 | c->Kr[i][1] = key[2] & 0x1f; |
144 | c->Kr[i][2] = key[4] & 0x1f; |
145 | c->Kr[i][3] = key[6] & 0x1f; |
146 | |
147 | c->Km[i][0] = key[7]; |
148 | c->Km[i][1] = key[5]; |
149 | c->Km[i][2] = key[3]; |
150 | c->Km[i][3] = key[1]; |
151 | } |
152 | |
153 | return 0; |
154 | } |
155 | EXPORT_SYMBOL_GPL(__cast6_setkey); |
156 | |
157 | int cast6_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
158 | { |
159 | return __cast6_setkey(crypto_tfm_ctx(tfm), key, keylen, |
160 | &tfm->crt_flags); |
161 | } |
162 | EXPORT_SYMBOL_GPL(cast6_setkey); |
163 | |
164 | /*forward quad round*/ |
165 | static inline void Q(u32 *block, u8 *Kr, u32 *Km) |
166 | { |
167 | u32 I; |
168 | block[2] ^= F1(block[3], Kr[0], Km[0]); |
169 | block[1] ^= F2(block[2], Kr[1], Km[1]); |
170 | block[0] ^= F3(block[1], Kr[2], Km[2]); |
171 | block[3] ^= F1(block[0], Kr[3], Km[3]); |
172 | } |
173 | |
174 | /*reverse quad round*/ |
175 | static inline void QBAR(u32 *block, u8 *Kr, u32 *Km) |
176 | { |
177 | u32 I; |
178 | block[3] ^= F1(block[0], Kr[3], Km[3]); |
179 | block[0] ^= F3(block[1], Kr[2], Km[2]); |
180 | block[1] ^= F2(block[2], Kr[1], Km[1]); |
181 | block[2] ^= F1(block[3], Kr[0], Km[0]); |
182 | } |
183 | |
184 | void __cast6_encrypt(struct cast6_ctx *c, u8 *outbuf, const u8 *inbuf) |
185 | { |
186 | const __be32 *src = (const __be32 *)inbuf; |
187 | __be32 *dst = (__be32 *)outbuf; |
188 | u32 block[4]; |
189 | u32 *Km; |
190 | u8 *Kr; |
191 | |
192 | block[0] = be32_to_cpu(src[0]); |
193 | block[1] = be32_to_cpu(src[1]); |
194 | block[2] = be32_to_cpu(src[2]); |
195 | block[3] = be32_to_cpu(src[3]); |
196 | |
197 | Km = c->Km[0]; Kr = c->Kr[0]; Q(block, Kr, Km); |
198 | Km = c->Km[1]; Kr = c->Kr[1]; Q(block, Kr, Km); |
199 | Km = c->Km[2]; Kr = c->Kr[2]; Q(block, Kr, Km); |
200 | Km = c->Km[3]; Kr = c->Kr[3]; Q(block, Kr, Km); |
201 | Km = c->Km[4]; Kr = c->Kr[4]; Q(block, Kr, Km); |
202 | Km = c->Km[5]; Kr = c->Kr[5]; Q(block, Kr, Km); |
203 | Km = c->Km[6]; Kr = c->Kr[6]; QBAR(block, Kr, Km); |
204 | Km = c->Km[7]; Kr = c->Kr[7]; QBAR(block, Kr, Km); |
205 | Km = c->Km[8]; Kr = c->Kr[8]; QBAR(block, Kr, Km); |
206 | Km = c->Km[9]; Kr = c->Kr[9]; QBAR(block, Kr, Km); |
207 | Km = c->Km[10]; Kr = c->Kr[10]; QBAR(block, Kr, Km); |
208 | Km = c->Km[11]; Kr = c->Kr[11]; QBAR(block, Kr, Km); |
209 | |
210 | dst[0] = cpu_to_be32(block[0]); |
211 | dst[1] = cpu_to_be32(block[1]); |
212 | dst[2] = cpu_to_be32(block[2]); |
213 | dst[3] = cpu_to_be32(block[3]); |
214 | } |
215 | EXPORT_SYMBOL_GPL(__cast6_encrypt); |
216 | |
217 | static void cast6_encrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf) |
218 | { |
219 | __cast6_encrypt(crypto_tfm_ctx(tfm), outbuf, inbuf); |
220 | } |
221 | |
222 | void __cast6_decrypt(struct cast6_ctx *c, u8 *outbuf, const u8 *inbuf) |
223 | { |
224 | const __be32 *src = (const __be32 *)inbuf; |
225 | __be32 *dst = (__be32 *)outbuf; |
226 | u32 block[4]; |
227 | u32 *Km; |
228 | u8 *Kr; |
229 | |
230 | block[0] = be32_to_cpu(src[0]); |
231 | block[1] = be32_to_cpu(src[1]); |
232 | block[2] = be32_to_cpu(src[2]); |
233 | block[3] = be32_to_cpu(src[3]); |
234 | |
235 | Km = c->Km[11]; Kr = c->Kr[11]; Q(block, Kr, Km); |
236 | Km = c->Km[10]; Kr = c->Kr[10]; Q(block, Kr, Km); |
237 | Km = c->Km[9]; Kr = c->Kr[9]; Q(block, Kr, Km); |
238 | Km = c->Km[8]; Kr = c->Kr[8]; Q(block, Kr, Km); |
239 | Km = c->Km[7]; Kr = c->Kr[7]; Q(block, Kr, Km); |
240 | Km = c->Km[6]; Kr = c->Kr[6]; Q(block, Kr, Km); |
241 | Km = c->Km[5]; Kr = c->Kr[5]; QBAR(block, Kr, Km); |
242 | Km = c->Km[4]; Kr = c->Kr[4]; QBAR(block, Kr, Km); |
243 | Km = c->Km[3]; Kr = c->Kr[3]; QBAR(block, Kr, Km); |
244 | Km = c->Km[2]; Kr = c->Kr[2]; QBAR(block, Kr, Km); |
245 | Km = c->Km[1]; Kr = c->Kr[1]; QBAR(block, Kr, Km); |
246 | Km = c->Km[0]; Kr = c->Kr[0]; QBAR(block, Kr, Km); |
247 | |
248 | dst[0] = cpu_to_be32(block[0]); |
249 | dst[1] = cpu_to_be32(block[1]); |
250 | dst[2] = cpu_to_be32(block[2]); |
251 | dst[3] = cpu_to_be32(block[3]); |
252 | } |
253 | EXPORT_SYMBOL_GPL(__cast6_decrypt); |
254 | |
255 | static void cast6_decrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf) |
256 | { |
257 | __cast6_decrypt(crypto_tfm_ctx(tfm), outbuf, inbuf); |
258 | } |
259 | |
260 | static struct crypto_alg alg = { |
261 | .cra_name = "cast6", |
262 | .cra_driver_name = "cast6-generic", |
263 | .cra_priority = 100, |
264 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
265 | .cra_blocksize = CAST6_BLOCK_SIZE, |
266 | .cra_ctxsize = sizeof(struct cast6_ctx), |
267 | .cra_alignmask = 3, |
268 | .cra_module = THIS_MODULE, |
269 | .cra_u = { |
270 | .cipher = { |
271 | .cia_min_keysize = CAST6_MIN_KEY_SIZE, |
272 | .cia_max_keysize = CAST6_MAX_KEY_SIZE, |
273 | .cia_setkey = cast6_setkey, |
274 | .cia_encrypt = cast6_encrypt, |
275 | .cia_decrypt = cast6_decrypt} |
276 | } |
277 | }; |
278 | |
279 | static int __init cast6_mod_init(void) |
280 | { |
281 | return crypto_register_alg(&alg); |
282 | } |
283 | |
284 | static void __exit cast6_mod_fini(void) |
285 | { |
286 | crypto_unregister_alg(&alg); |
287 | } |
288 | |
289 | module_init(cast6_mod_init); |
290 | module_exit(cast6_mod_fini); |
291 | |
292 | MODULE_LICENSE("GPL"); |
293 | MODULE_DESCRIPTION("Cast6 Cipher Algorithm"); |
294 | MODULE_ALIAS("cast6"); |
295 |
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