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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
81658ad0 DM |
2 | /* Glue code for CAMELLIA encryption optimized for sparc64 crypto opcodes. |
3 | * | |
4 | * Copyright (C) 2012 David S. Miller <[email protected]> | |
5 | */ | |
6 | ||
71741680 DM |
7 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
8 | ||
81658ad0 DM |
9 | #include <linux/crypto.h> |
10 | #include <linux/init.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/types.h> | |
14 | #include <crypto/algapi.h> | |
c72a26ef | 15 | #include <crypto/internal/skcipher.h> |
81658ad0 DM |
16 | |
17 | #include <asm/fpumacro.h> | |
18 | #include <asm/pstate.h> | |
19 | #include <asm/elf.h> | |
20 | ||
10803624 DM |
21 | #include "opcodes.h" |
22 | ||
81658ad0 DM |
23 | #define CAMELLIA_MIN_KEY_SIZE 16 |
24 | #define CAMELLIA_MAX_KEY_SIZE 32 | |
25 | #define CAMELLIA_BLOCK_SIZE 16 | |
26 | #define CAMELLIA_TABLE_BYTE_LEN 272 | |
27 | ||
28 | struct camellia_sparc64_ctx { | |
29 | u64 encrypt_key[CAMELLIA_TABLE_BYTE_LEN / sizeof(u64)]; | |
30 | u64 decrypt_key[CAMELLIA_TABLE_BYTE_LEN / sizeof(u64)]; | |
31 | int key_len; | |
32 | }; | |
33 | ||
34 | extern void camellia_sparc64_key_expand(const u32 *in_key, u64 *encrypt_key, | |
35 | unsigned int key_len, u64 *decrypt_key); | |
36 | ||
37 | static int camellia_set_key(struct crypto_tfm *tfm, const u8 *_in_key, | |
38 | unsigned int key_len) | |
39 | { | |
40 | struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm); | |
41 | const u32 *in_key = (const u32 *) _in_key; | |
81658ad0 | 42 | |
674f368a | 43 | if (key_len != 16 && key_len != 24 && key_len != 32) |
81658ad0 | 44 | return -EINVAL; |
81658ad0 DM |
45 | |
46 | ctx->key_len = key_len; | |
47 | ||
48 | camellia_sparc64_key_expand(in_key, &ctx->encrypt_key[0], | |
49 | key_len, &ctx->decrypt_key[0]); | |
50 | return 0; | |
51 | } | |
52 | ||
c72a26ef EB |
53 | static int camellia_set_key_skcipher(struct crypto_skcipher *tfm, |
54 | const u8 *in_key, unsigned int key_len) | |
55 | { | |
56 | return camellia_set_key(crypto_skcipher_tfm(tfm), in_key, key_len); | |
57 | } | |
58 | ||
81658ad0 DM |
59 | extern void camellia_sparc64_crypt(const u64 *key, const u32 *input, |
60 | u32 *output, unsigned int key_len); | |
61 | ||
62 | static void camellia_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) | |
63 | { | |
64 | struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm); | |
65 | ||
66 | camellia_sparc64_crypt(&ctx->encrypt_key[0], | |
67 | (const u32 *) src, | |
68 | (u32 *) dst, ctx->key_len); | |
69 | } | |
70 | ||
71 | static void camellia_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) | |
72 | { | |
73 | struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm); | |
74 | ||
75 | camellia_sparc64_crypt(&ctx->decrypt_key[0], | |
76 | (const u32 *) src, | |
77 | (u32 *) dst, ctx->key_len); | |
78 | } | |
79 | ||
80 | extern void camellia_sparc64_load_keys(const u64 *key, unsigned int key_len); | |
81 | ||
82 | typedef void ecb_crypt_op(const u64 *input, u64 *output, unsigned int len, | |
83 | const u64 *key); | |
84 | ||
85 | extern ecb_crypt_op camellia_sparc64_ecb_crypt_3_grand_rounds; | |
86 | extern ecb_crypt_op camellia_sparc64_ecb_crypt_4_grand_rounds; | |
87 | ||
c72a26ef | 88 | static int __ecb_crypt(struct skcipher_request *req, bool encrypt) |
81658ad0 | 89 | { |
c72a26ef EB |
90 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
91 | const struct camellia_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm); | |
92 | struct skcipher_walk walk; | |
81658ad0 DM |
93 | ecb_crypt_op *op; |
94 | const u64 *key; | |
c72a26ef | 95 | unsigned int nbytes; |
81658ad0 DM |
96 | int err; |
97 | ||
98 | op = camellia_sparc64_ecb_crypt_3_grand_rounds; | |
99 | if (ctx->key_len != 16) | |
100 | op = camellia_sparc64_ecb_crypt_4_grand_rounds; | |
101 | ||
c72a26ef EB |
102 | err = skcipher_walk_virt(&walk, req, true); |
103 | if (err) | |
104 | return err; | |
81658ad0 DM |
105 | |
106 | if (encrypt) | |
107 | key = &ctx->encrypt_key[0]; | |
108 | else | |
109 | key = &ctx->decrypt_key[0]; | |
110 | camellia_sparc64_load_keys(key, ctx->key_len); | |
c72a26ef EB |
111 | while ((nbytes = walk.nbytes) != 0) { |
112 | op(walk.src.virt.addr, walk.dst.virt.addr, | |
113 | round_down(nbytes, CAMELLIA_BLOCK_SIZE), key); | |
114 | err = skcipher_walk_done(&walk, nbytes % CAMELLIA_BLOCK_SIZE); | |
81658ad0 DM |
115 | } |
116 | fprs_write(0); | |
117 | return err; | |
118 | } | |
119 | ||
c72a26ef | 120 | static int ecb_encrypt(struct skcipher_request *req) |
81658ad0 | 121 | { |
c72a26ef | 122 | return __ecb_crypt(req, true); |
81658ad0 DM |
123 | } |
124 | ||
c72a26ef | 125 | static int ecb_decrypt(struct skcipher_request *req) |
81658ad0 | 126 | { |
c72a26ef | 127 | return __ecb_crypt(req, false); |
81658ad0 DM |
128 | } |
129 | ||
130 | typedef void cbc_crypt_op(const u64 *input, u64 *output, unsigned int len, | |
131 | const u64 *key, u64 *iv); | |
132 | ||
133 | extern cbc_crypt_op camellia_sparc64_cbc_encrypt_3_grand_rounds; | |
134 | extern cbc_crypt_op camellia_sparc64_cbc_encrypt_4_grand_rounds; | |
135 | extern cbc_crypt_op camellia_sparc64_cbc_decrypt_3_grand_rounds; | |
136 | extern cbc_crypt_op camellia_sparc64_cbc_decrypt_4_grand_rounds; | |
137 | ||
c72a26ef | 138 | static int cbc_encrypt(struct skcipher_request *req) |
81658ad0 | 139 | { |
c72a26ef EB |
140 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
141 | const struct camellia_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm); | |
142 | struct skcipher_walk walk; | |
81658ad0 DM |
143 | cbc_crypt_op *op; |
144 | const u64 *key; | |
c72a26ef | 145 | unsigned int nbytes; |
81658ad0 DM |
146 | int err; |
147 | ||
148 | op = camellia_sparc64_cbc_encrypt_3_grand_rounds; | |
149 | if (ctx->key_len != 16) | |
150 | op = camellia_sparc64_cbc_encrypt_4_grand_rounds; | |
151 | ||
c72a26ef EB |
152 | err = skcipher_walk_virt(&walk, req, true); |
153 | if (err) | |
154 | return err; | |
81658ad0 DM |
155 | |
156 | key = &ctx->encrypt_key[0]; | |
157 | camellia_sparc64_load_keys(key, ctx->key_len); | |
c72a26ef EB |
158 | while ((nbytes = walk.nbytes) != 0) { |
159 | op(walk.src.virt.addr, walk.dst.virt.addr, | |
160 | round_down(nbytes, CAMELLIA_BLOCK_SIZE), key, walk.iv); | |
161 | err = skcipher_walk_done(&walk, nbytes % CAMELLIA_BLOCK_SIZE); | |
81658ad0 DM |
162 | } |
163 | fprs_write(0); | |
164 | return err; | |
165 | } | |
166 | ||
c72a26ef | 167 | static int cbc_decrypt(struct skcipher_request *req) |
81658ad0 | 168 | { |
c72a26ef EB |
169 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
170 | const struct camellia_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm); | |
171 | struct skcipher_walk walk; | |
81658ad0 DM |
172 | cbc_crypt_op *op; |
173 | const u64 *key; | |
c72a26ef | 174 | unsigned int nbytes; |
81658ad0 DM |
175 | int err; |
176 | ||
177 | op = camellia_sparc64_cbc_decrypt_3_grand_rounds; | |
178 | if (ctx->key_len != 16) | |
179 | op = camellia_sparc64_cbc_decrypt_4_grand_rounds; | |
180 | ||
c72a26ef EB |
181 | err = skcipher_walk_virt(&walk, req, true); |
182 | if (err) | |
183 | return err; | |
81658ad0 DM |
184 | |
185 | key = &ctx->decrypt_key[0]; | |
186 | camellia_sparc64_load_keys(key, ctx->key_len); | |
c72a26ef EB |
187 | while ((nbytes = walk.nbytes) != 0) { |
188 | op(walk.src.virt.addr, walk.dst.virt.addr, | |
189 | round_down(nbytes, CAMELLIA_BLOCK_SIZE), key, walk.iv); | |
190 | err = skcipher_walk_done(&walk, nbytes % CAMELLIA_BLOCK_SIZE); | |
81658ad0 DM |
191 | } |
192 | fprs_write(0); | |
193 | return err; | |
194 | } | |
195 | ||
c72a26ef | 196 | static struct crypto_alg cipher_alg = { |
81658ad0 DM |
197 | .cra_name = "camellia", |
198 | .cra_driver_name = "camellia-sparc64", | |
10803624 | 199 | .cra_priority = SPARC_CR_OPCODE_PRIORITY, |
81658ad0 DM |
200 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
201 | .cra_blocksize = CAMELLIA_BLOCK_SIZE, | |
202 | .cra_ctxsize = sizeof(struct camellia_sparc64_ctx), | |
203 | .cra_alignmask = 3, | |
204 | .cra_module = THIS_MODULE, | |
205 | .cra_u = { | |
206 | .cipher = { | |
207 | .cia_min_keysize = CAMELLIA_MIN_KEY_SIZE, | |
208 | .cia_max_keysize = CAMELLIA_MAX_KEY_SIZE, | |
209 | .cia_setkey = camellia_set_key, | |
210 | .cia_encrypt = camellia_encrypt, | |
211 | .cia_decrypt = camellia_decrypt | |
212 | } | |
213 | } | |
c72a26ef EB |
214 | }; |
215 | ||
216 | static struct skcipher_alg skcipher_algs[] = { | |
217 | { | |
218 | .base.cra_name = "ecb(camellia)", | |
219 | .base.cra_driver_name = "ecb-camellia-sparc64", | |
220 | .base.cra_priority = SPARC_CR_OPCODE_PRIORITY, | |
221 | .base.cra_blocksize = CAMELLIA_BLOCK_SIZE, | |
222 | .base.cra_ctxsize = sizeof(struct camellia_sparc64_ctx), | |
223 | .base.cra_alignmask = 7, | |
224 | .base.cra_module = THIS_MODULE, | |
225 | .min_keysize = CAMELLIA_MIN_KEY_SIZE, | |
226 | .max_keysize = CAMELLIA_MAX_KEY_SIZE, | |
227 | .setkey = camellia_set_key_skcipher, | |
228 | .encrypt = ecb_encrypt, | |
229 | .decrypt = ecb_decrypt, | |
230 | }, { | |
231 | .base.cra_name = "cbc(camellia)", | |
232 | .base.cra_driver_name = "cbc-camellia-sparc64", | |
233 | .base.cra_priority = SPARC_CR_OPCODE_PRIORITY, | |
234 | .base.cra_blocksize = CAMELLIA_BLOCK_SIZE, | |
235 | .base.cra_ctxsize = sizeof(struct camellia_sparc64_ctx), | |
236 | .base.cra_alignmask = 7, | |
237 | .base.cra_module = THIS_MODULE, | |
238 | .min_keysize = CAMELLIA_MIN_KEY_SIZE, | |
239 | .max_keysize = CAMELLIA_MAX_KEY_SIZE, | |
240 | .ivsize = CAMELLIA_BLOCK_SIZE, | |
241 | .setkey = camellia_set_key_skcipher, | |
242 | .encrypt = cbc_encrypt, | |
243 | .decrypt = cbc_decrypt, | |
244 | } | |
81658ad0 DM |
245 | }; |
246 | ||
247 | static bool __init sparc64_has_camellia_opcode(void) | |
248 | { | |
249 | unsigned long cfr; | |
250 | ||
251 | if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) | |
252 | return false; | |
253 | ||
254 | __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); | |
255 | if (!(cfr & CFR_CAMELLIA)) | |
256 | return false; | |
257 | ||
258 | return true; | |
259 | } | |
260 | ||
261 | static int __init camellia_sparc64_mod_init(void) | |
262 | { | |
c72a26ef EB |
263 | int err; |
264 | ||
265 | if (!sparc64_has_camellia_opcode()) { | |
266 | pr_info("sparc64 camellia opcodes not available.\n"); | |
267 | return -ENODEV; | |
81658ad0 | 268 | } |
c72a26ef EB |
269 | pr_info("Using sparc64 camellia opcodes optimized CAMELLIA implementation\n"); |
270 | err = crypto_register_alg(&cipher_alg); | |
271 | if (err) | |
272 | return err; | |
273 | err = crypto_register_skciphers(skcipher_algs, | |
274 | ARRAY_SIZE(skcipher_algs)); | |
275 | if (err) | |
276 | crypto_unregister_alg(&cipher_alg); | |
277 | return err; | |
81658ad0 DM |
278 | } |
279 | ||
280 | static void __exit camellia_sparc64_mod_fini(void) | |
281 | { | |
c72a26ef EB |
282 | crypto_unregister_alg(&cipher_alg); |
283 | crypto_unregister_skciphers(skcipher_algs, ARRAY_SIZE(skcipher_algs)); | |
81658ad0 DM |
284 | } |
285 | ||
286 | module_init(camellia_sparc64_mod_init); | |
287 | module_exit(camellia_sparc64_mod_fini); | |
288 | ||
289 | MODULE_LICENSE("GPL"); | |
290 | MODULE_DESCRIPTION("Camellia Cipher Algorithm, sparc64 camellia opcode accelerated"); | |
291 | ||
7d676fdb | 292 | MODULE_ALIAS_CRYPTO("camellia"); |
226f7cea DM |
293 | |
294 | #include "crop_devid.c" |