1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * Cryptographic API. 2 * Cryptographic API.
4 * 3 *
5 * TEA, XTEA, and XETA crypto alogrithms 4 * TEA, XTEA, and XETA crypto alogrithms
6 * 5 *
7 * The TEA and Xtended TEA algorithms were dev 6 * The TEA and Xtended TEA algorithms were developed by David Wheeler
8 * and Roger Needham at the Computer Laborator 7 * and Roger Needham at the Computer Laboratory of Cambridge University.
9 * 8 *
10 * Due to the order of evaluation in XTEA many 9 * Due to the order of evaluation in XTEA many people have incorrectly
11 * implemented it. XETA (XTEA in the wrong or 10 * implemented it. XETA (XTEA in the wrong order), exists for
12 * compatibility with these implementations. 11 * compatibility with these implementations.
13 * 12 *
14 * Copyright (c) 2004 Aaron Grothe ajgrothe@ya 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 *
15 */ 20 */
16 21
17 #include <crypto/algapi.h> <<
18 #include <linux/init.h> 22 #include <linux/init.h>
19 #include <linux/module.h> 23 #include <linux/module.h>
20 #include <linux/mm.h> 24 #include <linux/mm.h>
21 #include <asm/byteorder.h> 25 #include <asm/byteorder.h>
>> 26 #include <linux/crypto.h>
22 #include <linux/types.h> 27 #include <linux/types.h>
23 28
24 #define TEA_KEY_SIZE 16 29 #define TEA_KEY_SIZE 16
25 #define TEA_BLOCK_SIZE 8 30 #define TEA_BLOCK_SIZE 8
26 #define TEA_ROUNDS 32 31 #define TEA_ROUNDS 32
27 #define TEA_DELTA 0x9e3779b9 32 #define TEA_DELTA 0x9e3779b9
28 33
29 #define XTEA_KEY_SIZE 16 34 #define XTEA_KEY_SIZE 16
30 #define XTEA_BLOCK_SIZE 8 35 #define XTEA_BLOCK_SIZE 8
31 #define XTEA_ROUNDS 32 36 #define XTEA_ROUNDS 32
32 #define XTEA_DELTA 0x9e3779b9 37 #define XTEA_DELTA 0x9e3779b9
33 38
34 struct tea_ctx { 39 struct tea_ctx {
35 u32 KEY[4]; 40 u32 KEY[4];
36 }; 41 };
37 42
38 struct xtea_ctx { 43 struct xtea_ctx {
39 u32 KEY[4]; 44 u32 KEY[4];
40 }; 45 };
41 46
42 static int tea_setkey(struct crypto_tfm *tfm, 47 static int tea_setkey(struct crypto_tfm *tfm, const u8 *in_key,
43 unsigned int key_len) 48 unsigned int key_len)
44 { 49 {
45 struct tea_ctx *ctx = crypto_tfm_ctx(t 50 struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
46 const __le32 *key = (const __le32 *)in 51 const __le32 *key = (const __le32 *)in_key;
47 52
48 ctx->KEY[0] = le32_to_cpu(key[0]); 53 ctx->KEY[0] = le32_to_cpu(key[0]);
49 ctx->KEY[1] = le32_to_cpu(key[1]); 54 ctx->KEY[1] = le32_to_cpu(key[1]);
50 ctx->KEY[2] = le32_to_cpu(key[2]); 55 ctx->KEY[2] = le32_to_cpu(key[2]);
51 ctx->KEY[3] = le32_to_cpu(key[3]); 56 ctx->KEY[3] = le32_to_cpu(key[3]);
52 57
53 return 0; 58 return 0;
54 59
55 } 60 }
56 61
57 static void tea_encrypt(struct crypto_tfm *tfm 62 static void tea_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
58 { 63 {
59 u32 y, z, n, sum = 0; 64 u32 y, z, n, sum = 0;
60 u32 k0, k1, k2, k3; 65 u32 k0, k1, k2, k3;
61 struct tea_ctx *ctx = crypto_tfm_ctx(t 66 struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
62 const __le32 *in = (const __le32 *)src 67 const __le32 *in = (const __le32 *)src;
63 __le32 *out = (__le32 *)dst; 68 __le32 *out = (__le32 *)dst;
64 69
65 y = le32_to_cpu(in[0]); 70 y = le32_to_cpu(in[0]);
66 z = le32_to_cpu(in[1]); 71 z = le32_to_cpu(in[1]);
67 72
68 k0 = ctx->KEY[0]; 73 k0 = ctx->KEY[0];
69 k1 = ctx->KEY[1]; 74 k1 = ctx->KEY[1];
70 k2 = ctx->KEY[2]; 75 k2 = ctx->KEY[2];
71 k3 = ctx->KEY[3]; 76 k3 = ctx->KEY[3];
72 77
73 n = TEA_ROUNDS; 78 n = TEA_ROUNDS;
74 79
75 while (n-- > 0) { 80 while (n-- > 0) {
76 sum += TEA_DELTA; 81 sum += TEA_DELTA;
77 y += ((z << 4) + k0) ^ (z + su 82 y += ((z << 4) + k0) ^ (z + sum) ^ ((z >> 5) + k1);
78 z += ((y << 4) + k2) ^ (y + su 83 z += ((y << 4) + k2) ^ (y + sum) ^ ((y >> 5) + k3);
79 } 84 }
80 85
81 out[0] = cpu_to_le32(y); 86 out[0] = cpu_to_le32(y);
82 out[1] = cpu_to_le32(z); 87 out[1] = cpu_to_le32(z);
83 } 88 }
84 89
85 static void tea_decrypt(struct crypto_tfm *tfm 90 static void tea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
86 { 91 {
87 u32 y, z, n, sum; 92 u32 y, z, n, sum;
88 u32 k0, k1, k2, k3; 93 u32 k0, k1, k2, k3;
89 struct tea_ctx *ctx = crypto_tfm_ctx(t 94 struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
90 const __le32 *in = (const __le32 *)src 95 const __le32 *in = (const __le32 *)src;
91 __le32 *out = (__le32 *)dst; 96 __le32 *out = (__le32 *)dst;
92 97
93 y = le32_to_cpu(in[0]); 98 y = le32_to_cpu(in[0]);
94 z = le32_to_cpu(in[1]); 99 z = le32_to_cpu(in[1]);
95 100
96 k0 = ctx->KEY[0]; 101 k0 = ctx->KEY[0];
97 k1 = ctx->KEY[1]; 102 k1 = ctx->KEY[1];
98 k2 = ctx->KEY[2]; 103 k2 = ctx->KEY[2];
99 k3 = ctx->KEY[3]; 104 k3 = ctx->KEY[3];
100 105
101 sum = TEA_DELTA << 5; 106 sum = TEA_DELTA << 5;
102 107
103 n = TEA_ROUNDS; 108 n = TEA_ROUNDS;
104 109
105 while (n-- > 0) { 110 while (n-- > 0) {
106 z -= ((y << 4) + k2) ^ (y + su 111 z -= ((y << 4) + k2) ^ (y + sum) ^ ((y >> 5) + k3);
107 y -= ((z << 4) + k0) ^ (z + su 112 y -= ((z << 4) + k0) ^ (z + sum) ^ ((z >> 5) + k1);
108 sum -= TEA_DELTA; 113 sum -= TEA_DELTA;
109 } 114 }
110 115
111 out[0] = cpu_to_le32(y); 116 out[0] = cpu_to_le32(y);
112 out[1] = cpu_to_le32(z); 117 out[1] = cpu_to_le32(z);
113 } 118 }
114 119
115 static int xtea_setkey(struct crypto_tfm *tfm, 120 static int xtea_setkey(struct crypto_tfm *tfm, const u8 *in_key,
116 unsigned int key_len) 121 unsigned int key_len)
117 { 122 {
118 struct xtea_ctx *ctx = crypto_tfm_ctx( 123 struct xtea_ctx *ctx = crypto_tfm_ctx(tfm);
119 const __le32 *key = (const __le32 *)in 124 const __le32 *key = (const __le32 *)in_key;
120 125
121 ctx->KEY[0] = le32_to_cpu(key[0]); 126 ctx->KEY[0] = le32_to_cpu(key[0]);
122 ctx->KEY[1] = le32_to_cpu(key[1]); 127 ctx->KEY[1] = le32_to_cpu(key[1]);
123 ctx->KEY[2] = le32_to_cpu(key[2]); 128 ctx->KEY[2] = le32_to_cpu(key[2]);
124 ctx->KEY[3] = le32_to_cpu(key[3]); 129 ctx->KEY[3] = le32_to_cpu(key[3]);
125 130
126 return 0; 131 return 0;
127 132
128 } 133 }
129 134
130 static void xtea_encrypt(struct crypto_tfm *tf 135 static void xtea_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
131 { 136 {
132 u32 y, z, sum = 0; 137 u32 y, z, sum = 0;
133 u32 limit = XTEA_DELTA * XTEA_ROUNDS; 138 u32 limit = XTEA_DELTA * XTEA_ROUNDS;
134 struct xtea_ctx *ctx = crypto_tfm_ctx( 139 struct xtea_ctx *ctx = crypto_tfm_ctx(tfm);
135 const __le32 *in = (const __le32 *)src 140 const __le32 *in = (const __le32 *)src;
136 __le32 *out = (__le32 *)dst; 141 __le32 *out = (__le32 *)dst;
137 142
138 y = le32_to_cpu(in[0]); 143 y = le32_to_cpu(in[0]);
139 z = le32_to_cpu(in[1]); 144 z = le32_to_cpu(in[1]);
140 145
141 while (sum != limit) { 146 while (sum != limit) {
142 y += ((z << 4 ^ z >> 5) + z) ^ 147 y += ((z << 4 ^ z >> 5) + z) ^ (sum + ctx->KEY[sum&3]);
143 sum += XTEA_DELTA; 148 sum += XTEA_DELTA;
144 z += ((y << 4 ^ y >> 5) + y) ^ 149 z += ((y << 4 ^ y >> 5) + y) ^ (sum + ctx->KEY[sum>>11 &3]);
145 } 150 }
146 151
147 out[0] = cpu_to_le32(y); 152 out[0] = cpu_to_le32(y);
148 out[1] = cpu_to_le32(z); 153 out[1] = cpu_to_le32(z);
149 } 154 }
150 155
151 static void xtea_decrypt(struct crypto_tfm *tf 156 static void xtea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
152 { 157 {
153 u32 y, z, sum; 158 u32 y, z, sum;
154 struct tea_ctx *ctx = crypto_tfm_ctx(t 159 struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
155 const __le32 *in = (const __le32 *)src 160 const __le32 *in = (const __le32 *)src;
156 __le32 *out = (__le32 *)dst; 161 __le32 *out = (__le32 *)dst;
157 162
158 y = le32_to_cpu(in[0]); 163 y = le32_to_cpu(in[0]);
159 z = le32_to_cpu(in[1]); 164 z = le32_to_cpu(in[1]);
160 165
161 sum = XTEA_DELTA * XTEA_ROUNDS; 166 sum = XTEA_DELTA * XTEA_ROUNDS;
162 167
163 while (sum) { 168 while (sum) {
164 z -= ((y << 4 ^ y >> 5) + y) ^ 169 z -= ((y << 4 ^ y >> 5) + y) ^ (sum + ctx->KEY[sum>>11 & 3]);
165 sum -= XTEA_DELTA; 170 sum -= XTEA_DELTA;
166 y -= ((z << 4 ^ z >> 5) + z) ^ 171 y -= ((z << 4 ^ z >> 5) + z) ^ (sum + ctx->KEY[sum & 3]);
167 } 172 }
168 173
169 out[0] = cpu_to_le32(y); 174 out[0] = cpu_to_le32(y);
170 out[1] = cpu_to_le32(z); 175 out[1] = cpu_to_le32(z);
171 } 176 }
172 177
173 178
174 static void xeta_encrypt(struct crypto_tfm *tf 179 static void xeta_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
175 { 180 {
176 u32 y, z, sum = 0; 181 u32 y, z, sum = 0;
177 u32 limit = XTEA_DELTA * XTEA_ROUNDS; 182 u32 limit = XTEA_DELTA * XTEA_ROUNDS;
178 struct xtea_ctx *ctx = crypto_tfm_ctx( 183 struct xtea_ctx *ctx = crypto_tfm_ctx(tfm);
179 const __le32 *in = (const __le32 *)src 184 const __le32 *in = (const __le32 *)src;
180 __le32 *out = (__le32 *)dst; 185 __le32 *out = (__le32 *)dst;
181 186
182 y = le32_to_cpu(in[0]); 187 y = le32_to_cpu(in[0]);
183 z = le32_to_cpu(in[1]); 188 z = le32_to_cpu(in[1]);
184 189
185 while (sum != limit) { 190 while (sum != limit) {
186 y += (z << 4 ^ z >> 5) + (z ^ 191 y += (z << 4 ^ z >> 5) + (z ^ sum) + ctx->KEY[sum&3];
187 sum += XTEA_DELTA; 192 sum += XTEA_DELTA;
188 z += (y << 4 ^ y >> 5) + (y ^ 193 z += (y << 4 ^ y >> 5) + (y ^ sum) + ctx->KEY[sum>>11 &3];
189 } 194 }
190 195
191 out[0] = cpu_to_le32(y); 196 out[0] = cpu_to_le32(y);
192 out[1] = cpu_to_le32(z); 197 out[1] = cpu_to_le32(z);
193 } 198 }
194 199
195 static void xeta_decrypt(struct crypto_tfm *tf 200 static void xeta_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
196 { 201 {
197 u32 y, z, sum; 202 u32 y, z, sum;
198 struct tea_ctx *ctx = crypto_tfm_ctx(t 203 struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
199 const __le32 *in = (const __le32 *)src 204 const __le32 *in = (const __le32 *)src;
200 __le32 *out = (__le32 *)dst; 205 __le32 *out = (__le32 *)dst;
201 206
202 y = le32_to_cpu(in[0]); 207 y = le32_to_cpu(in[0]);
203 z = le32_to_cpu(in[1]); 208 z = le32_to_cpu(in[1]);
204 209
205 sum = XTEA_DELTA * XTEA_ROUNDS; 210 sum = XTEA_DELTA * XTEA_ROUNDS;
206 211
207 while (sum) { 212 while (sum) {
208 z -= (y << 4 ^ y >> 5) + (y ^ 213 z -= (y << 4 ^ y >> 5) + (y ^ sum) + ctx->KEY[sum>>11 & 3];
209 sum -= XTEA_DELTA; 214 sum -= XTEA_DELTA;
210 y -= (z << 4 ^ z >> 5) + (z ^ 215 y -= (z << 4 ^ z >> 5) + (z ^ sum) + ctx->KEY[sum & 3];
211 } 216 }
212 217
213 out[0] = cpu_to_le32(y); 218 out[0] = cpu_to_le32(y);
214 out[1] = cpu_to_le32(z); 219 out[1] = cpu_to_le32(z);
215 } 220 }
216 221
217 static struct crypto_alg tea_algs[3] = { { 222 static struct crypto_alg tea_algs[3] = { {
218 .cra_name = "tea", 223 .cra_name = "tea",
219 .cra_driver_name = "tea-g <<
220 .cra_flags = CRYPTO 224 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
221 .cra_blocksize = TEA_BL 225 .cra_blocksize = TEA_BLOCK_SIZE,
222 .cra_ctxsize = sizeof 226 .cra_ctxsize = sizeof (struct tea_ctx),
223 .cra_alignmask = 3, 227 .cra_alignmask = 3,
224 .cra_module = THIS_M 228 .cra_module = THIS_MODULE,
225 .cra_u = { .cip 229 .cra_u = { .cipher = {
226 .cia_min_keysize = TEA_KE 230 .cia_min_keysize = TEA_KEY_SIZE,
227 .cia_max_keysize = TEA_KE 231 .cia_max_keysize = TEA_KEY_SIZE,
228 .cia_setkey = tea_se 232 .cia_setkey = tea_setkey,
229 .cia_encrypt = tea_en 233 .cia_encrypt = tea_encrypt,
230 .cia_decrypt = tea_de 234 .cia_decrypt = tea_decrypt } }
231 }, { 235 }, {
232 .cra_name = "xtea" 236 .cra_name = "xtea",
233 .cra_driver_name = "xtea- <<
234 .cra_flags = CRYPTO 237 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
235 .cra_blocksize = XTEA_B 238 .cra_blocksize = XTEA_BLOCK_SIZE,
236 .cra_ctxsize = sizeof 239 .cra_ctxsize = sizeof (struct xtea_ctx),
237 .cra_alignmask = 3, 240 .cra_alignmask = 3,
238 .cra_module = THIS_M 241 .cra_module = THIS_MODULE,
239 .cra_u = { .cip 242 .cra_u = { .cipher = {
240 .cia_min_keysize = XTEA_K 243 .cia_min_keysize = XTEA_KEY_SIZE,
241 .cia_max_keysize = XTEA_K 244 .cia_max_keysize = XTEA_KEY_SIZE,
242 .cia_setkey = xtea_s 245 .cia_setkey = xtea_setkey,
243 .cia_encrypt = xtea_e 246 .cia_encrypt = xtea_encrypt,
244 .cia_decrypt = xtea_d 247 .cia_decrypt = xtea_decrypt } }
245 }, { 248 }, {
246 .cra_name = "xeta" 249 .cra_name = "xeta",
247 .cra_driver_name = "xeta- <<
248 .cra_flags = CRYPTO 250 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
249 .cra_blocksize = XTEA_B 251 .cra_blocksize = XTEA_BLOCK_SIZE,
250 .cra_ctxsize = sizeof 252 .cra_ctxsize = sizeof (struct xtea_ctx),
251 .cra_alignmask = 3, 253 .cra_alignmask = 3,
252 .cra_module = THIS_M 254 .cra_module = THIS_MODULE,
253 .cra_u = { .cip 255 .cra_u = { .cipher = {
254 .cia_min_keysize = XTEA_K 256 .cia_min_keysize = XTEA_KEY_SIZE,
255 .cia_max_keysize = XTEA_K 257 .cia_max_keysize = XTEA_KEY_SIZE,
256 .cia_setkey = xtea_s 258 .cia_setkey = xtea_setkey,
257 .cia_encrypt = xeta_e 259 .cia_encrypt = xeta_encrypt,
258 .cia_decrypt = xeta_d 260 .cia_decrypt = xeta_decrypt } }
259 } }; 261 } };
260 262
261 static int __init tea_mod_init(void) 263 static int __init tea_mod_init(void)
262 { 264 {
263 return crypto_register_algs(tea_algs, 265 return crypto_register_algs(tea_algs, ARRAY_SIZE(tea_algs));
264 } 266 }
265 267
266 static void __exit tea_mod_fini(void) 268 static void __exit tea_mod_fini(void)
267 { 269 {
268 crypto_unregister_algs(tea_algs, ARRAY 270 crypto_unregister_algs(tea_algs, ARRAY_SIZE(tea_algs));
269 } 271 }
270 272
271 MODULE_ALIAS_CRYPTO("tea"); 273 MODULE_ALIAS_CRYPTO("tea");
272 MODULE_ALIAS_CRYPTO("xtea"); 274 MODULE_ALIAS_CRYPTO("xtea");
273 MODULE_ALIAS_CRYPTO("xeta"); 275 MODULE_ALIAS_CRYPTO("xeta");
274 276
275 subsys_initcall(tea_mod_init); !! 277 module_init(tea_mod_init);
276 module_exit(tea_mod_fini); 278 module_exit(tea_mod_fini);
277 279
278 MODULE_LICENSE("GPL"); 280 MODULE_LICENSE("GPL");
279 MODULE_DESCRIPTION("TEA, XTEA & XETA Cryptogra 281 MODULE_DESCRIPTION("TEA, XTEA & XETA Cryptographic Algorithms");
280 282
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