ia64/linux-2.6.18-xen.hg

view crypto/tea.c @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents 831230e53067
children
line source
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 */
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/mm.h>
25 #include <asm/byteorder.h>
26 #include <asm/scatterlist.h>
27 #include <linux/crypto.h>
28 #include <linux/types.h>
30 #define TEA_KEY_SIZE 16
31 #define TEA_BLOCK_SIZE 8
32 #define TEA_ROUNDS 32
33 #define TEA_DELTA 0x9e3779b9
35 #define XTEA_KEY_SIZE 16
36 #define XTEA_BLOCK_SIZE 8
37 #define XTEA_ROUNDS 32
38 #define XTEA_DELTA 0x9e3779b9
40 struct tea_ctx {
41 u32 KEY[4];
42 };
44 struct xtea_ctx {
45 u32 KEY[4];
46 };
48 static int tea_setkey(struct crypto_tfm *tfm, const u8 *in_key,
49 unsigned int key_len, u32 *flags)
50 {
51 struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
52 const __le32 *key = (const __le32 *)in_key;
54 if (key_len != 16)
55 {
56 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
57 return -EINVAL;
58 }
60 ctx->KEY[0] = le32_to_cpu(key[0]);
61 ctx->KEY[1] = le32_to_cpu(key[1]);
62 ctx->KEY[2] = le32_to_cpu(key[2]);
63 ctx->KEY[3] = le32_to_cpu(key[3]);
65 return 0;
67 }
69 static void tea_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
70 {
71 u32 y, z, n, sum = 0;
72 u32 k0, k1, k2, k3;
73 struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
74 const __le32 *in = (const __le32 *)src;
75 __le32 *out = (__le32 *)dst;
77 y = le32_to_cpu(in[0]);
78 z = le32_to_cpu(in[1]);
80 k0 = ctx->KEY[0];
81 k1 = ctx->KEY[1];
82 k2 = ctx->KEY[2];
83 k3 = ctx->KEY[3];
85 n = TEA_ROUNDS;
87 while (n-- > 0) {
88 sum += TEA_DELTA;
89 y += ((z << 4) + k0) ^ (z + sum) ^ ((z >> 5) + k1);
90 z += ((y << 4) + k2) ^ (y + sum) ^ ((y >> 5) + k3);
91 }
93 out[0] = cpu_to_le32(y);
94 out[1] = cpu_to_le32(z);
95 }
97 static void tea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
98 {
99 u32 y, z, n, sum;
100 u32 k0, k1, k2, k3;
101 struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
102 const __le32 *in = (const __le32 *)src;
103 __le32 *out = (__le32 *)dst;
105 y = le32_to_cpu(in[0]);
106 z = le32_to_cpu(in[1]);
108 k0 = ctx->KEY[0];
109 k1 = ctx->KEY[1];
110 k2 = ctx->KEY[2];
111 k3 = ctx->KEY[3];
113 sum = TEA_DELTA << 5;
115 n = TEA_ROUNDS;
117 while (n-- > 0) {
118 z -= ((y << 4) + k2) ^ (y + sum) ^ ((y >> 5) + k3);
119 y -= ((z << 4) + k0) ^ (z + sum) ^ ((z >> 5) + k1);
120 sum -= TEA_DELTA;
121 }
123 out[0] = cpu_to_le32(y);
124 out[1] = cpu_to_le32(z);
125 }
127 static int xtea_setkey(struct crypto_tfm *tfm, const u8 *in_key,
128 unsigned int key_len, u32 *flags)
129 {
130 struct xtea_ctx *ctx = crypto_tfm_ctx(tfm);
131 const __le32 *key = (const __le32 *)in_key;
133 if (key_len != 16)
134 {
135 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
136 return -EINVAL;
137 }
139 ctx->KEY[0] = le32_to_cpu(key[0]);
140 ctx->KEY[1] = le32_to_cpu(key[1]);
141 ctx->KEY[2] = le32_to_cpu(key[2]);
142 ctx->KEY[3] = le32_to_cpu(key[3]);
144 return 0;
146 }
148 static void xtea_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
149 {
150 u32 y, z, sum = 0;
151 u32 limit = XTEA_DELTA * XTEA_ROUNDS;
152 struct xtea_ctx *ctx = crypto_tfm_ctx(tfm);
153 const __le32 *in = (const __le32 *)src;
154 __le32 *out = (__le32 *)dst;
156 y = le32_to_cpu(in[0]);
157 z = le32_to_cpu(in[1]);
159 while (sum != limit) {
160 y += ((z << 4 ^ z >> 5) + z) ^ (sum + ctx->KEY[sum&3]);
161 sum += XTEA_DELTA;
162 z += ((y << 4 ^ y >> 5) + y) ^ (sum + ctx->KEY[sum>>11 &3]);
163 }
165 out[0] = cpu_to_le32(y);
166 out[1] = cpu_to_le32(z);
167 }
169 static void xtea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
170 {
171 u32 y, z, sum;
172 struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
173 const __le32 *in = (const __le32 *)src;
174 __le32 *out = (__le32 *)dst;
176 y = le32_to_cpu(in[0]);
177 z = le32_to_cpu(in[1]);
179 sum = XTEA_DELTA * XTEA_ROUNDS;
181 while (sum) {
182 z -= ((y << 4 ^ y >> 5) + y) ^ (sum + ctx->KEY[sum>>11 & 3]);
183 sum -= XTEA_DELTA;
184 y -= ((z << 4 ^ z >> 5) + z) ^ (sum + ctx->KEY[sum & 3]);
185 }
187 out[0] = cpu_to_le32(y);
188 out[1] = cpu_to_le32(z);
189 }
192 static void xeta_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
193 {
194 u32 y, z, sum = 0;
195 u32 limit = XTEA_DELTA * XTEA_ROUNDS;
196 struct xtea_ctx *ctx = crypto_tfm_ctx(tfm);
197 const __le32 *in = (const __le32 *)src;
198 __le32 *out = (__le32 *)dst;
200 y = le32_to_cpu(in[0]);
201 z = le32_to_cpu(in[1]);
203 while (sum != limit) {
204 y += (z << 4 ^ z >> 5) + (z ^ sum) + ctx->KEY[sum&3];
205 sum += XTEA_DELTA;
206 z += (y << 4 ^ y >> 5) + (y ^ sum) + ctx->KEY[sum>>11 &3];
207 }
209 out[0] = cpu_to_le32(y);
210 out[1] = cpu_to_le32(z);
211 }
213 static void xeta_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
214 {
215 u32 y, z, sum;
216 struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
217 const __le32 *in = (const __le32 *)src;
218 __le32 *out = (__le32 *)dst;
220 y = le32_to_cpu(in[0]);
221 z = le32_to_cpu(in[1]);
223 sum = XTEA_DELTA * XTEA_ROUNDS;
225 while (sum) {
226 z -= (y << 4 ^ y >> 5) + (y ^ sum) + ctx->KEY[sum>>11 & 3];
227 sum -= XTEA_DELTA;
228 y -= (z << 4 ^ z >> 5) + (z ^ sum) + ctx->KEY[sum & 3];
229 }
231 out[0] = cpu_to_le32(y);
232 out[1] = cpu_to_le32(z);
233 }
235 static struct crypto_alg tea_alg = {
236 .cra_name = "tea",
237 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
238 .cra_blocksize = TEA_BLOCK_SIZE,
239 .cra_ctxsize = sizeof (struct tea_ctx),
240 .cra_alignmask = 3,
241 .cra_module = THIS_MODULE,
242 .cra_list = LIST_HEAD_INIT(tea_alg.cra_list),
243 .cra_u = { .cipher = {
244 .cia_min_keysize = TEA_KEY_SIZE,
245 .cia_max_keysize = TEA_KEY_SIZE,
246 .cia_setkey = tea_setkey,
247 .cia_encrypt = tea_encrypt,
248 .cia_decrypt = tea_decrypt } }
249 };
251 static struct crypto_alg xtea_alg = {
252 .cra_name = "xtea",
253 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
254 .cra_blocksize = XTEA_BLOCK_SIZE,
255 .cra_ctxsize = sizeof (struct xtea_ctx),
256 .cra_alignmask = 3,
257 .cra_module = THIS_MODULE,
258 .cra_list = LIST_HEAD_INIT(xtea_alg.cra_list),
259 .cra_u = { .cipher = {
260 .cia_min_keysize = XTEA_KEY_SIZE,
261 .cia_max_keysize = XTEA_KEY_SIZE,
262 .cia_setkey = xtea_setkey,
263 .cia_encrypt = xtea_encrypt,
264 .cia_decrypt = xtea_decrypt } }
265 };
267 static struct crypto_alg xeta_alg = {
268 .cra_name = "xeta",
269 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
270 .cra_blocksize = XTEA_BLOCK_SIZE,
271 .cra_ctxsize = sizeof (struct xtea_ctx),
272 .cra_alignmask = 3,
273 .cra_module = THIS_MODULE,
274 .cra_list = LIST_HEAD_INIT(xtea_alg.cra_list),
275 .cra_u = { .cipher = {
276 .cia_min_keysize = XTEA_KEY_SIZE,
277 .cia_max_keysize = XTEA_KEY_SIZE,
278 .cia_setkey = xtea_setkey,
279 .cia_encrypt = xeta_encrypt,
280 .cia_decrypt = xeta_decrypt } }
281 };
283 static int __init init(void)
284 {
285 int ret = 0;
287 ret = crypto_register_alg(&tea_alg);
288 if (ret < 0)
289 goto out;
291 ret = crypto_register_alg(&xtea_alg);
292 if (ret < 0) {
293 crypto_unregister_alg(&tea_alg);
294 goto out;
295 }
297 ret = crypto_register_alg(&xeta_alg);
298 if (ret < 0) {
299 crypto_unregister_alg(&tea_alg);
300 crypto_unregister_alg(&xtea_alg);
301 goto out;
302 }
304 out:
305 return ret;
306 }
308 static void __exit fini(void)
309 {
310 crypto_unregister_alg(&tea_alg);
311 crypto_unregister_alg(&xtea_alg);
312 crypto_unregister_alg(&xeta_alg);
313 }
315 MODULE_ALIAS("xtea");
316 MODULE_ALIAS("xeta");
318 module_init(init);
319 module_exit(fini);
321 MODULE_LICENSE("GPL");
322 MODULE_DESCRIPTION("TEA, XTEA & XETA Cryptographic Algorithms");