1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Glue code for CAMELLIA encryption optimized for sparc64 crypto opcodes.
3 *
4 * Copyright (C) 2012 David S. Miller <davem@davemloft.net>
5 */
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
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>
15 #include <crypto/internal/skcipher.h>
16
17 #include <asm/fpumacro.h>
18 #include <asm/pstate.h>
19 #include <asm/elf.h>
20
21 #include "opcodes.h"
22
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;
42
43 if (key_len != 16 && key_len != 24 && key_len != 32)
44 return -EINVAL;
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
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
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
88 static int __ecb_crypt(struct skcipher_request *req, bool encrypt)
89 {
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;
93 ecb_crypt_op *op;
94 const u64 *key;
95 unsigned int nbytes;
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
102 err = skcipher_walk_virt(&walk, req, true);
103 if (err)
104 return err;
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);
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);
115 }
116 fprs_write(0);
117 return err;
118 }
119
120 static int ecb_encrypt(struct skcipher_request *req)
121 {
122 return __ecb_crypt(req, true);
123 }
124
125 static int ecb_decrypt(struct skcipher_request *req)
126 {
127 return __ecb_crypt(req, false);
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
138 static int cbc_encrypt(struct skcipher_request *req)
139 {
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;
143 cbc_crypt_op *op;
144 const u64 *key;
145 unsigned int nbytes;
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
152 err = skcipher_walk_virt(&walk, req, true);
153 if (err)
154 return err;
155
156 key = &ctx->encrypt_key[0];
157 camellia_sparc64_load_keys(key, ctx->key_len);
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);
162 }
163 fprs_write(0);
164 return err;
165 }
166
167 static int cbc_decrypt(struct skcipher_request *req)
168 {
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;
172 cbc_crypt_op *op;
173 const u64 *key;
174 unsigned int nbytes;
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
181 err = skcipher_walk_virt(&walk, req, true);
182 if (err)
183 return err;
184
185 key = &ctx->decrypt_key[0];
186 camellia_sparc64_load_keys(key, ctx->key_len);
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);
191 }
192 fprs_write(0);
193 return err;
194 }
195
196 static struct crypto_alg cipher_alg = {
197 .cra_name = "camellia",
198 .cra_driver_name = "camellia-sparc64",
199 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
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 }
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 }
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 {
263 int err;
264
265 if (!sparc64_has_camellia_opcode()) {
266 pr_info("sparc64 camellia opcodes not available.\n");
267 return -ENODEV;
268 }
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;
278 }
279
280 static void __exit camellia_sparc64_mod_fini(void)
281 {
282 crypto_unregister_alg(&cipher_alg);
283 crypto_unregister_skciphers(skcipher_algs, ARRAY_SIZE(skcipher_algs));
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
292 MODULE_ALIAS_CRYPTO("camellia");
293
294 #include "crop_devid.c"
295
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