forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
aria_generic.c
313 lines (259 loc) · 7.34 KB
/
aria_generic.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Cryptographic API.
*
* ARIA Cipher Algorithm.
*
* Documentation of ARIA can be found in RFC 5794.
* Copyright (c) 2022 Taehee Yoo <[email protected]>
*
* Information for ARIA
* http://210.104.33.10/ARIA/index-e.html (English)
* http://seed.kisa.or.kr/ (Korean)
*
* Public domain version is distributed above.
*/
#include <crypto/aria.h>
static const u32 key_rc[20] = {
0x517cc1b7, 0x27220a94, 0xfe13abe8, 0xfa9a6ee0,
0x6db14acc, 0x9e21c820, 0xff28b1d5, 0xef5de2b0,
0xdb92371d, 0x2126e970, 0x03249775, 0x04e8c90e,
0x517cc1b7, 0x27220a94, 0xfe13abe8, 0xfa9a6ee0,
0x6db14acc, 0x9e21c820, 0xff28b1d5, 0xef5de2b0
};
static void aria_set_encrypt_key(struct aria_ctx *ctx, const u8 *in_key,
unsigned int key_len)
{
const __be32 *key = (const __be32 *)in_key;
u32 w0[4], w1[4], w2[4], w3[4];
u32 reg0, reg1, reg2, reg3;
const u32 *ck;
int rkidx = 0;
ck = &key_rc[(key_len - 16) / 2];
w0[0] = be32_to_cpu(key[0]);
w0[1] = be32_to_cpu(key[1]);
w0[2] = be32_to_cpu(key[2]);
w0[3] = be32_to_cpu(key[3]);
reg0 = w0[0] ^ ck[0];
reg1 = w0[1] ^ ck[1];
reg2 = w0[2] ^ ck[2];
reg3 = w0[3] ^ ck[3];
aria_subst_diff_odd(®0, ®1, ®2, ®3);
if (key_len > 16) {
w1[0] = be32_to_cpu(key[4]);
w1[1] = be32_to_cpu(key[5]);
if (key_len > 24) {
w1[2] = be32_to_cpu(key[6]);
w1[3] = be32_to_cpu(key[7]);
} else {
w1[2] = 0;
w1[3] = 0;
}
} else {
w1[0] = 0;
w1[1] = 0;
w1[2] = 0;
w1[3] = 0;
}
w1[0] ^= reg0;
w1[1] ^= reg1;
w1[2] ^= reg2;
w1[3] ^= reg3;
reg0 = w1[0];
reg1 = w1[1];
reg2 = w1[2];
reg3 = w1[3];
reg0 ^= ck[4];
reg1 ^= ck[5];
reg2 ^= ck[6];
reg3 ^= ck[7];
aria_subst_diff_even(®0, ®1, ®2, ®3);
reg0 ^= w0[0];
reg1 ^= w0[1];
reg2 ^= w0[2];
reg3 ^= w0[3];
w2[0] = reg0;
w2[1] = reg1;
w2[2] = reg2;
w2[3] = reg3;
reg0 ^= ck[8];
reg1 ^= ck[9];
reg2 ^= ck[10];
reg3 ^= ck[11];
aria_subst_diff_odd(®0, ®1, ®2, ®3);
w3[0] = reg0 ^ w1[0];
w3[1] = reg1 ^ w1[1];
w3[2] = reg2 ^ w1[2];
w3[3] = reg3 ^ w1[3];
aria_gsrk(ctx->enc_key[rkidx], w0, w1, 19);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w1, w2, 19);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w2, w3, 19);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w3, w0, 19);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w0, w1, 31);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w1, w2, 31);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w2, w3, 31);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w3, w0, 31);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w0, w1, 67);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w1, w2, 67);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w2, w3, 67);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w3, w0, 67);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w0, w1, 97);
if (key_len > 16) {
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w1, w2, 97);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w2, w3, 97);
if (key_len > 24) {
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w3, w0, 97);
rkidx++;
aria_gsrk(ctx->enc_key[rkidx], w0, w1, 109);
}
}
}
static void aria_set_decrypt_key(struct aria_ctx *ctx)
{
int i;
for (i = 0; i < 4; i++) {
ctx->dec_key[0][i] = ctx->enc_key[ctx->rounds][i];
ctx->dec_key[ctx->rounds][i] = ctx->enc_key[0][i];
}
for (i = 1; i < ctx->rounds; i++) {
ctx->dec_key[i][0] = aria_m(ctx->enc_key[ctx->rounds - i][0]);
ctx->dec_key[i][1] = aria_m(ctx->enc_key[ctx->rounds - i][1]);
ctx->dec_key[i][2] = aria_m(ctx->enc_key[ctx->rounds - i][2]);
ctx->dec_key[i][3] = aria_m(ctx->enc_key[ctx->rounds - i][3]);
aria_diff_word(&ctx->dec_key[i][0], &ctx->dec_key[i][1],
&ctx->dec_key[i][2], &ctx->dec_key[i][3]);
aria_diff_byte(&ctx->dec_key[i][1],
&ctx->dec_key[i][2], &ctx->dec_key[i][3]);
aria_diff_word(&ctx->dec_key[i][0], &ctx->dec_key[i][1],
&ctx->dec_key[i][2], &ctx->dec_key[i][3]);
}
}
int aria_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len)
{
struct aria_ctx *ctx = crypto_tfm_ctx(tfm);
if (key_len != 16 && key_len != 24 && key_len != 32)
return -EINVAL;
ctx->key_length = key_len;
ctx->rounds = (key_len + 32) / 4;
aria_set_encrypt_key(ctx, in_key, key_len);
aria_set_decrypt_key(ctx);
return 0;
}
EXPORT_SYMBOL_GPL(aria_set_key);
static void __aria_crypt(struct aria_ctx *ctx, u8 *out, const u8 *in,
u32 key[][ARIA_RD_KEY_WORDS])
{
const __be32 *src = (const __be32 *)in;
__be32 *dst = (__be32 *)out;
u32 reg0, reg1, reg2, reg3;
int rounds, rkidx = 0;
rounds = ctx->rounds;
reg0 = be32_to_cpu(src[0]);
reg1 = be32_to_cpu(src[1]);
reg2 = be32_to_cpu(src[2]);
reg3 = be32_to_cpu(src[3]);
aria_add_round_key(key[rkidx], ®0, ®1, ®2, ®3);
rkidx++;
aria_subst_diff_odd(®0, ®1, ®2, ®3);
aria_add_round_key(key[rkidx], ®0, ®1, ®2, ®3);
rkidx++;
while ((rounds -= 2) > 0) {
aria_subst_diff_even(®0, ®1, ®2, ®3);
aria_add_round_key(key[rkidx], ®0, ®1, ®2, ®3);
rkidx++;
aria_subst_diff_odd(®0, ®1, ®2, ®3);
aria_add_round_key(key[rkidx], ®0, ®1, ®2, ®3);
rkidx++;
}
reg0 = key[rkidx][0] ^ make_u32((u8)(x1[get_u8(reg0, 0)]),
(u8)(x2[get_u8(reg0, 1)] >> 8),
(u8)(s1[get_u8(reg0, 2)]),
(u8)(s2[get_u8(reg0, 3)]));
reg1 = key[rkidx][1] ^ make_u32((u8)(x1[get_u8(reg1, 0)]),
(u8)(x2[get_u8(reg1, 1)] >> 8),
(u8)(s1[get_u8(reg1, 2)]),
(u8)(s2[get_u8(reg1, 3)]));
reg2 = key[rkidx][2] ^ make_u32((u8)(x1[get_u8(reg2, 0)]),
(u8)(x2[get_u8(reg2, 1)] >> 8),
(u8)(s1[get_u8(reg2, 2)]),
(u8)(s2[get_u8(reg2, 3)]));
reg3 = key[rkidx][3] ^ make_u32((u8)(x1[get_u8(reg3, 0)]),
(u8)(x2[get_u8(reg3, 1)] >> 8),
(u8)(s1[get_u8(reg3, 2)]),
(u8)(s2[get_u8(reg3, 3)]));
dst[0] = cpu_to_be32(reg0);
dst[1] = cpu_to_be32(reg1);
dst[2] = cpu_to_be32(reg2);
dst[3] = cpu_to_be32(reg3);
}
void aria_encrypt(void *_ctx, u8 *out, const u8 *in)
{
struct aria_ctx *ctx = (struct aria_ctx *)_ctx;
__aria_crypt(ctx, out, in, ctx->enc_key);
}
EXPORT_SYMBOL_GPL(aria_encrypt);
void aria_decrypt(void *_ctx, u8 *out, const u8 *in)
{
struct aria_ctx *ctx = (struct aria_ctx *)_ctx;
__aria_crypt(ctx, out, in, ctx->dec_key);
}
EXPORT_SYMBOL_GPL(aria_decrypt);
static void __aria_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct aria_ctx *ctx = crypto_tfm_ctx(tfm);
__aria_crypt(ctx, out, in, ctx->enc_key);
}
static void __aria_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct aria_ctx *ctx = crypto_tfm_ctx(tfm);
__aria_crypt(ctx, out, in, ctx->dec_key);
}
static struct crypto_alg aria_alg = {
.cra_name = "aria",
.cra_driver_name = "aria-generic",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = ARIA_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct aria_ctx),
.cra_alignmask = 3,
.cra_module = THIS_MODULE,
.cra_u = {
.cipher = {
.cia_min_keysize = ARIA_MIN_KEY_SIZE,
.cia_max_keysize = ARIA_MAX_KEY_SIZE,
.cia_setkey = aria_set_key,
.cia_encrypt = __aria_encrypt,
.cia_decrypt = __aria_decrypt
}
}
};
static int __init aria_init(void)
{
return crypto_register_alg(&aria_alg);
}
static void __exit aria_fini(void)
{
crypto_unregister_alg(&aria_alg);
}
subsys_initcall(aria_init);
module_exit(aria_fini);
MODULE_DESCRIPTION("ARIA Cipher Algorithm");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Taehee Yoo <[email protected]>");
MODULE_ALIAS_CRYPTO("aria");
MODULE_ALIAS_CRYPTO("aria-generic");