GNU Linux-libre 6.9.1-gnu
[releases.git] / arch / sparc / crypto / camellia_glue.c
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"