Merge tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
[sfrench/cifs-2.6.git] / arch / arm / crypto / ghash-ce-glue.c
1 /*
2  * Accelerated GHASH implementation with ARMv8 vmull.p64 instructions.
3  *
4  * Copyright (C) 2015 - 2018 Linaro Ltd. <ard.biesheuvel@linaro.org>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License version 2 as published
8  * by the Free Software Foundation.
9  */
10
11 #include <asm/hwcap.h>
12 #include <asm/neon.h>
13 #include <asm/simd.h>
14 #include <asm/unaligned.h>
15 #include <crypto/cryptd.h>
16 #include <crypto/internal/hash.h>
17 #include <crypto/internal/simd.h>
18 #include <crypto/gf128mul.h>
19 #include <linux/cpufeature.h>
20 #include <linux/crypto.h>
21 #include <linux/module.h>
22
23 MODULE_DESCRIPTION("GHASH secure hash using ARMv8 Crypto Extensions");
24 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
25 MODULE_LICENSE("GPL v2");
26 MODULE_ALIAS_CRYPTO("ghash");
27
28 #define GHASH_BLOCK_SIZE        16
29 #define GHASH_DIGEST_SIZE       16
30
31 struct ghash_key {
32         u64     h[2];
33         u64     h2[2];
34         u64     h3[2];
35         u64     h4[2];
36 };
37
38 struct ghash_desc_ctx {
39         u64 digest[GHASH_DIGEST_SIZE/sizeof(u64)];
40         u8 buf[GHASH_BLOCK_SIZE];
41         u32 count;
42 };
43
44 struct ghash_async_ctx {
45         struct cryptd_ahash *cryptd_tfm;
46 };
47
48 asmlinkage void pmull_ghash_update_p64(int blocks, u64 dg[], const char *src,
49                                        struct ghash_key const *k,
50                                        const char *head);
51
52 asmlinkage void pmull_ghash_update_p8(int blocks, u64 dg[], const char *src,
53                                       struct ghash_key const *k,
54                                       const char *head);
55
56 static void (*pmull_ghash_update)(int blocks, u64 dg[], const char *src,
57                                   struct ghash_key const *k,
58                                   const char *head);
59
60 static int ghash_init(struct shash_desc *desc)
61 {
62         struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
63
64         *ctx = (struct ghash_desc_ctx){};
65         return 0;
66 }
67
68 static int ghash_update(struct shash_desc *desc, const u8 *src,
69                         unsigned int len)
70 {
71         struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
72         unsigned int partial = ctx->count % GHASH_BLOCK_SIZE;
73
74         ctx->count += len;
75
76         if ((partial + len) >= GHASH_BLOCK_SIZE) {
77                 struct ghash_key *key = crypto_shash_ctx(desc->tfm);
78                 int blocks;
79
80                 if (partial) {
81                         int p = GHASH_BLOCK_SIZE - partial;
82
83                         memcpy(ctx->buf + partial, src, p);
84                         src += p;
85                         len -= p;
86                 }
87
88                 blocks = len / GHASH_BLOCK_SIZE;
89                 len %= GHASH_BLOCK_SIZE;
90
91                 kernel_neon_begin();
92                 pmull_ghash_update(blocks, ctx->digest, src, key,
93                                    partial ? ctx->buf : NULL);
94                 kernel_neon_end();
95                 src += blocks * GHASH_BLOCK_SIZE;
96                 partial = 0;
97         }
98         if (len)
99                 memcpy(ctx->buf + partial, src, len);
100         return 0;
101 }
102
103 static int ghash_final(struct shash_desc *desc, u8 *dst)
104 {
105         struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
106         unsigned int partial = ctx->count % GHASH_BLOCK_SIZE;
107
108         if (partial) {
109                 struct ghash_key *key = crypto_shash_ctx(desc->tfm);
110
111                 memset(ctx->buf + partial, 0, GHASH_BLOCK_SIZE - partial);
112                 kernel_neon_begin();
113                 pmull_ghash_update(1, ctx->digest, ctx->buf, key, NULL);
114                 kernel_neon_end();
115         }
116         put_unaligned_be64(ctx->digest[1], dst);
117         put_unaligned_be64(ctx->digest[0], dst + 8);
118
119         *ctx = (struct ghash_desc_ctx){};
120         return 0;
121 }
122
123 static void ghash_reflect(u64 h[], const be128 *k)
124 {
125         u64 carry = be64_to_cpu(k->a) >> 63;
126
127         h[0] = (be64_to_cpu(k->b) << 1) | carry;
128         h[1] = (be64_to_cpu(k->a) << 1) | (be64_to_cpu(k->b) >> 63);
129
130         if (carry)
131                 h[1] ^= 0xc200000000000000UL;
132 }
133
134 static int ghash_setkey(struct crypto_shash *tfm,
135                         const u8 *inkey, unsigned int keylen)
136 {
137         struct ghash_key *key = crypto_shash_ctx(tfm);
138         be128 h, k;
139
140         if (keylen != GHASH_BLOCK_SIZE) {
141                 crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
142                 return -EINVAL;
143         }
144
145         memcpy(&k, inkey, GHASH_BLOCK_SIZE);
146         ghash_reflect(key->h, &k);
147
148         h = k;
149         gf128mul_lle(&h, &k);
150         ghash_reflect(key->h2, &h);
151
152         gf128mul_lle(&h, &k);
153         ghash_reflect(key->h3, &h);
154
155         gf128mul_lle(&h, &k);
156         ghash_reflect(key->h4, &h);
157
158         return 0;
159 }
160
161 static struct shash_alg ghash_alg = {
162         .digestsize             = GHASH_DIGEST_SIZE,
163         .init                   = ghash_init,
164         .update                 = ghash_update,
165         .final                  = ghash_final,
166         .setkey                 = ghash_setkey,
167         .descsize               = sizeof(struct ghash_desc_ctx),
168         .base                   = {
169                 .cra_name       = "__ghash",
170                 .cra_driver_name = "__driver-ghash-ce",
171                 .cra_priority   = 0,
172                 .cra_flags      = CRYPTO_ALG_INTERNAL,
173                 .cra_blocksize  = GHASH_BLOCK_SIZE,
174                 .cra_ctxsize    = sizeof(struct ghash_key),
175                 .cra_module     = THIS_MODULE,
176         },
177 };
178
179 static int ghash_async_init(struct ahash_request *req)
180 {
181         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
182         struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
183         struct ahash_request *cryptd_req = ahash_request_ctx(req);
184         struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
185         struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
186         struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
187
188         desc->tfm = child;
189         return crypto_shash_init(desc);
190 }
191
192 static int ghash_async_update(struct ahash_request *req)
193 {
194         struct ahash_request *cryptd_req = ahash_request_ctx(req);
195         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
196         struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
197         struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
198
199         if (!crypto_simd_usable() ||
200             (in_atomic() && cryptd_ahash_queued(cryptd_tfm))) {
201                 memcpy(cryptd_req, req, sizeof(*req));
202                 ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
203                 return crypto_ahash_update(cryptd_req);
204         } else {
205                 struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
206                 return shash_ahash_update(req, desc);
207         }
208 }
209
210 static int ghash_async_final(struct ahash_request *req)
211 {
212         struct ahash_request *cryptd_req = ahash_request_ctx(req);
213         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
214         struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
215         struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
216
217         if (!crypto_simd_usable() ||
218             (in_atomic() && cryptd_ahash_queued(cryptd_tfm))) {
219                 memcpy(cryptd_req, req, sizeof(*req));
220                 ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
221                 return crypto_ahash_final(cryptd_req);
222         } else {
223                 struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
224                 return crypto_shash_final(desc, req->result);
225         }
226 }
227
228 static int ghash_async_digest(struct ahash_request *req)
229 {
230         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
231         struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
232         struct ahash_request *cryptd_req = ahash_request_ctx(req);
233         struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
234
235         if (!crypto_simd_usable() ||
236             (in_atomic() && cryptd_ahash_queued(cryptd_tfm))) {
237                 memcpy(cryptd_req, req, sizeof(*req));
238                 ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
239                 return crypto_ahash_digest(cryptd_req);
240         } else {
241                 struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
242                 struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
243
244                 desc->tfm = child;
245                 return shash_ahash_digest(req, desc);
246         }
247 }
248
249 static int ghash_async_import(struct ahash_request *req, const void *in)
250 {
251         struct ahash_request *cryptd_req = ahash_request_ctx(req);
252         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
253         struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
254         struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
255
256         desc->tfm = cryptd_ahash_child(ctx->cryptd_tfm);
257
258         return crypto_shash_import(desc, in);
259 }
260
261 static int ghash_async_export(struct ahash_request *req, void *out)
262 {
263         struct ahash_request *cryptd_req = ahash_request_ctx(req);
264         struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
265
266         return crypto_shash_export(desc, out);
267 }
268
269 static int ghash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
270                               unsigned int keylen)
271 {
272         struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
273         struct crypto_ahash *child = &ctx->cryptd_tfm->base;
274         int err;
275
276         crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
277         crypto_ahash_set_flags(child, crypto_ahash_get_flags(tfm)
278                                & CRYPTO_TFM_REQ_MASK);
279         err = crypto_ahash_setkey(child, key, keylen);
280         crypto_ahash_set_flags(tfm, crypto_ahash_get_flags(child)
281                                & CRYPTO_TFM_RES_MASK);
282
283         return err;
284 }
285
286 static int ghash_async_init_tfm(struct crypto_tfm *tfm)
287 {
288         struct cryptd_ahash *cryptd_tfm;
289         struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
290
291         cryptd_tfm = cryptd_alloc_ahash("__driver-ghash-ce",
292                                         CRYPTO_ALG_INTERNAL,
293                                         CRYPTO_ALG_INTERNAL);
294         if (IS_ERR(cryptd_tfm))
295                 return PTR_ERR(cryptd_tfm);
296         ctx->cryptd_tfm = cryptd_tfm;
297         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
298                                  sizeof(struct ahash_request) +
299                                  crypto_ahash_reqsize(&cryptd_tfm->base));
300
301         return 0;
302 }
303
304 static void ghash_async_exit_tfm(struct crypto_tfm *tfm)
305 {
306         struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
307
308         cryptd_free_ahash(ctx->cryptd_tfm);
309 }
310
311 static struct ahash_alg ghash_async_alg = {
312         .init                   = ghash_async_init,
313         .update                 = ghash_async_update,
314         .final                  = ghash_async_final,
315         .setkey                 = ghash_async_setkey,
316         .digest                 = ghash_async_digest,
317         .import                 = ghash_async_import,
318         .export                 = ghash_async_export,
319         .halg.digestsize        = GHASH_DIGEST_SIZE,
320         .halg.statesize         = sizeof(struct ghash_desc_ctx),
321         .halg.base              = {
322                 .cra_name       = "ghash",
323                 .cra_driver_name = "ghash-ce",
324                 .cra_priority   = 300,
325                 .cra_flags      = CRYPTO_ALG_ASYNC,
326                 .cra_blocksize  = GHASH_BLOCK_SIZE,
327                 .cra_ctxsize    = sizeof(struct ghash_async_ctx),
328                 .cra_module     = THIS_MODULE,
329                 .cra_init       = ghash_async_init_tfm,
330                 .cra_exit       = ghash_async_exit_tfm,
331         },
332 };
333
334 static int __init ghash_ce_mod_init(void)
335 {
336         int err;
337
338         if (!(elf_hwcap & HWCAP_NEON))
339                 return -ENODEV;
340
341         if (elf_hwcap2 & HWCAP2_PMULL)
342                 pmull_ghash_update = pmull_ghash_update_p64;
343         else
344                 pmull_ghash_update = pmull_ghash_update_p8;
345
346         err = crypto_register_shash(&ghash_alg);
347         if (err)
348                 return err;
349         err = crypto_register_ahash(&ghash_async_alg);
350         if (err)
351                 goto err_shash;
352
353         return 0;
354
355 err_shash:
356         crypto_unregister_shash(&ghash_alg);
357         return err;
358 }
359
360 static void __exit ghash_ce_mod_exit(void)
361 {
362         crypto_unregister_ahash(&ghash_async_alg);
363         crypto_unregister_shash(&ghash_alg);
364 }
365
366 module_init(ghash_ce_mod_init);
367 module_exit(ghash_ce_mod_exit);