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1 | /* |
2 | * Cryptographic API. |
3 | * |
4 | * TEA, XTEA, and XETA crypto alogrithms |
5 | * |
6 | * The TEA and Xtended TEA algorithms were developed by David Wheeler |
7 | * and Roger Needham at the Computer Laboratory of Cambridge University. |
8 | * |
9 | * Due to the order of evaluation in XTEA many people have incorrectly |
10 | * implemented it. XETA (XTEA in the wrong order), exists for |
11 | * compatibility with these implementations. |
12 | * |
13 | * Copyright (c) 2004 Aaron Grothe ajgrothe@yahoo.com |
14 | * |
15 | * This program is free software; you can redistribute it and/or modify |
16 | * it under the terms of the GNU General Public License as published by |
17 | * the Free Software Foundation; either version 2 of the License, or |
18 | * (at your option) any later version. |
19 | * |
20 | */ |
21 | |
22 | #include <linux/init.h> |
23 | #include <linux/module.h> |
24 | #include <linux/mm.h> |
25 | #include <asm/byteorder.h> |
26 | #include <linux/crypto.h> |
27 | #include <linux/types.h> |
28 | |
29 | #define TEA_KEY_SIZE 16 |
30 | #define TEA_BLOCK_SIZE 8 |
31 | #define TEA_ROUNDS 32 |
32 | #define TEA_DELTA 0x9e3779b9 |
33 | |
34 | #define XTEA_KEY_SIZE 16 |
35 | #define XTEA_BLOCK_SIZE 8 |
36 | #define XTEA_ROUNDS 32 |
37 | #define XTEA_DELTA 0x9e3779b9 |
38 | |
39 | struct tea_ctx { |
40 | u32 KEY[4]; |
41 | }; |
42 | |
43 | struct xtea_ctx { |
44 | u32 KEY[4]; |
45 | }; |
46 | |
47 | static int tea_setkey(struct crypto_tfm *tfm, const u8 *in_key, |
48 | unsigned int key_len) |
49 | { |
50 | struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
51 | const __le32 *key = (const __le32 *)in_key; |
52 | |
53 | ctx->KEY[0] = le32_to_cpu(key[0]); |
54 | ctx->KEY[1] = le32_to_cpu(key[1]); |
55 | ctx->KEY[2] = le32_to_cpu(key[2]); |
56 | ctx->KEY[3] = le32_to_cpu(key[3]); |
57 | |
58 | return 0; |
59 | |
60 | } |
61 | |
62 | static void tea_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
63 | { |
64 | u32 y, z, n, sum = 0; |
65 | u32 k0, k1, k2, k3; |
66 | struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
67 | const __le32 *in = (const __le32 *)src; |
68 | __le32 *out = (__le32 *)dst; |
69 | |
70 | y = le32_to_cpu(in[0]); |
71 | z = le32_to_cpu(in[1]); |
72 | |
73 | k0 = ctx->KEY[0]; |
74 | k1 = ctx->KEY[1]; |
75 | k2 = ctx->KEY[2]; |
76 | k3 = ctx->KEY[3]; |
77 | |
78 | n = TEA_ROUNDS; |
79 | |
80 | while (n-- > 0) { |
81 | sum += TEA_DELTA; |
82 | y += ((z << 4) + k0) ^ (z + sum) ^ ((z >> 5) + k1); |
83 | z += ((y << 4) + k2) ^ (y + sum) ^ ((y >> 5) + k3); |
84 | } |
85 | |
86 | out[0] = cpu_to_le32(y); |
87 | out[1] = cpu_to_le32(z); |
88 | } |
89 | |
90 | static void tea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
91 | { |
92 | u32 y, z, n, sum; |
93 | u32 k0, k1, k2, k3; |
94 | struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
95 | const __le32 *in = (const __le32 *)src; |
96 | __le32 *out = (__le32 *)dst; |
97 | |
98 | y = le32_to_cpu(in[0]); |
99 | z = le32_to_cpu(in[1]); |
100 | |
101 | k0 = ctx->KEY[0]; |
102 | k1 = ctx->KEY[1]; |
103 | k2 = ctx->KEY[2]; |
104 | k3 = ctx->KEY[3]; |
105 | |
106 | sum = TEA_DELTA << 5; |
107 | |
108 | n = TEA_ROUNDS; |
109 | |
110 | while (n-- > 0) { |
111 | z -= ((y << 4) + k2) ^ (y + sum) ^ ((y >> 5) + k3); |
112 | y -= ((z << 4) + k0) ^ (z + sum) ^ ((z >> 5) + k1); |
113 | sum -= TEA_DELTA; |
114 | } |
115 | |
116 | out[0] = cpu_to_le32(y); |
117 | out[1] = cpu_to_le32(z); |
118 | } |
119 | |
120 | static int xtea_setkey(struct crypto_tfm *tfm, const u8 *in_key, |
121 | unsigned int key_len) |
122 | { |
123 | struct xtea_ctx *ctx = crypto_tfm_ctx(tfm); |
124 | const __le32 *key = (const __le32 *)in_key; |
125 | |
126 | ctx->KEY[0] = le32_to_cpu(key[0]); |
127 | ctx->KEY[1] = le32_to_cpu(key[1]); |
128 | ctx->KEY[2] = le32_to_cpu(key[2]); |
129 | ctx->KEY[3] = le32_to_cpu(key[3]); |
130 | |
131 | return 0; |
132 | |
133 | } |
134 | |
135 | static void xtea_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
136 | { |
137 | u32 y, z, sum = 0; |
138 | u32 limit = XTEA_DELTA * XTEA_ROUNDS; |
139 | struct xtea_ctx *ctx = crypto_tfm_ctx(tfm); |
140 | const __le32 *in = (const __le32 *)src; |
141 | __le32 *out = (__le32 *)dst; |
142 | |
143 | y = le32_to_cpu(in[0]); |
144 | z = le32_to_cpu(in[1]); |
145 | |
146 | while (sum != limit) { |
147 | y += ((z << 4 ^ z >> 5) + z) ^ (sum + ctx->KEY[sum&3]); |
148 | sum += XTEA_DELTA; |
149 | z += ((y << 4 ^ y >> 5) + y) ^ (sum + ctx->KEY[sum>>11 &3]); |
150 | } |
151 | |
152 | out[0] = cpu_to_le32(y); |
153 | out[1] = cpu_to_le32(z); |
154 | } |
155 | |
156 | static void xtea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
157 | { |
158 | u32 y, z, sum; |
159 | struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
160 | const __le32 *in = (const __le32 *)src; |
161 | __le32 *out = (__le32 *)dst; |
162 | |
163 | y = le32_to_cpu(in[0]); |
164 | z = le32_to_cpu(in[1]); |
165 | |
166 | sum = XTEA_DELTA * XTEA_ROUNDS; |
167 | |
168 | while (sum) { |
169 | z -= ((y << 4 ^ y >> 5) + y) ^ (sum + ctx->KEY[sum>>11 & 3]); |
170 | sum -= XTEA_DELTA; |
171 | y -= ((z << 4 ^ z >> 5) + z) ^ (sum + ctx->KEY[sum & 3]); |
172 | } |
173 | |
174 | out[0] = cpu_to_le32(y); |
175 | out[1] = cpu_to_le32(z); |
176 | } |
177 | |
178 | |
179 | static void xeta_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
180 | { |
181 | u32 y, z, sum = 0; |
182 | u32 limit = XTEA_DELTA * XTEA_ROUNDS; |
183 | struct xtea_ctx *ctx = crypto_tfm_ctx(tfm); |
184 | const __le32 *in = (const __le32 *)src; |
185 | __le32 *out = (__le32 *)dst; |
186 | |
187 | y = le32_to_cpu(in[0]); |
188 | z = le32_to_cpu(in[1]); |
189 | |
190 | while (sum != limit) { |
191 | y += (z << 4 ^ z >> 5) + (z ^ sum) + ctx->KEY[sum&3]; |
192 | sum += XTEA_DELTA; |
193 | z += (y << 4 ^ y >> 5) + (y ^ sum) + ctx->KEY[sum>>11 &3]; |
194 | } |
195 | |
196 | out[0] = cpu_to_le32(y); |
197 | out[1] = cpu_to_le32(z); |
198 | } |
199 | |
200 | static void xeta_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
201 | { |
202 | u32 y, z, sum; |
203 | struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
204 | const __le32 *in = (const __le32 *)src; |
205 | __le32 *out = (__le32 *)dst; |
206 | |
207 | y = le32_to_cpu(in[0]); |
208 | z = le32_to_cpu(in[1]); |
209 | |
210 | sum = XTEA_DELTA * XTEA_ROUNDS; |
211 | |
212 | while (sum) { |
213 | z -= (y << 4 ^ y >> 5) + (y ^ sum) + ctx->KEY[sum>>11 & 3]; |
214 | sum -= XTEA_DELTA; |
215 | y -= (z << 4 ^ z >> 5) + (z ^ sum) + ctx->KEY[sum & 3]; |
216 | } |
217 | |
218 | out[0] = cpu_to_le32(y); |
219 | out[1] = cpu_to_le32(z); |
220 | } |
221 | |
222 | static struct crypto_alg tea_algs[3] = { { |
223 | .cra_name = "tea", |
224 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
225 | .cra_blocksize = TEA_BLOCK_SIZE, |
226 | .cra_ctxsize = sizeof (struct tea_ctx), |
227 | .cra_alignmask = 3, |
228 | .cra_module = THIS_MODULE, |
229 | .cra_u = { .cipher = { |
230 | .cia_min_keysize = TEA_KEY_SIZE, |
231 | .cia_max_keysize = TEA_KEY_SIZE, |
232 | .cia_setkey = tea_setkey, |
233 | .cia_encrypt = tea_encrypt, |
234 | .cia_decrypt = tea_decrypt } } |
235 | }, { |
236 | .cra_name = "xtea", |
237 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
238 | .cra_blocksize = XTEA_BLOCK_SIZE, |
239 | .cra_ctxsize = sizeof (struct xtea_ctx), |
240 | .cra_alignmask = 3, |
241 | .cra_module = THIS_MODULE, |
242 | .cra_u = { .cipher = { |
243 | .cia_min_keysize = XTEA_KEY_SIZE, |
244 | .cia_max_keysize = XTEA_KEY_SIZE, |
245 | .cia_setkey = xtea_setkey, |
246 | .cia_encrypt = xtea_encrypt, |
247 | .cia_decrypt = xtea_decrypt } } |
248 | }, { |
249 | .cra_name = "xeta", |
250 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
251 | .cra_blocksize = XTEA_BLOCK_SIZE, |
252 | .cra_ctxsize = sizeof (struct xtea_ctx), |
253 | .cra_alignmask = 3, |
254 | .cra_module = THIS_MODULE, |
255 | .cra_u = { .cipher = { |
256 | .cia_min_keysize = XTEA_KEY_SIZE, |
257 | .cia_max_keysize = XTEA_KEY_SIZE, |
258 | .cia_setkey = xtea_setkey, |
259 | .cia_encrypt = xeta_encrypt, |
260 | .cia_decrypt = xeta_decrypt } } |
261 | } }; |
262 | |
263 | static int __init tea_mod_init(void) |
264 | { |
265 | return crypto_register_algs(tea_algs, ARRAY_SIZE(tea_algs)); |
266 | } |
267 | |
268 | static void __exit tea_mod_fini(void) |
269 | { |
270 | crypto_unregister_algs(tea_algs, ARRAY_SIZE(tea_algs)); |
271 | } |
272 | |
273 | MODULE_ALIAS("xtea"); |
274 | MODULE_ALIAS("xeta"); |
275 | |
276 | module_init(tea_mod_init); |
277 | module_exit(tea_mod_fini); |
278 | |
279 | MODULE_LICENSE("GPL"); |
280 | MODULE_DESCRIPTION("TEA, XTEA & XETA Cryptographic Algorithms"); |
281 |
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