1/*
2 * The AEGIS-128 Authenticated-Encryption Algorithm
3 * Glue for AES-NI + SSE2 implementation
4 *
5 * Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
6 * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
11 * any later version.
12 */
13
14#include <crypto/cryptd.h>
15#include <crypto/internal/aead.h>
16#include <crypto/internal/skcipher.h>
17#include <crypto/scatterwalk.h>
18#include <linux/module.h>
19#include <asm/fpu/api.h>
20#include <asm/cpu_device_id.h>
21
22#define AEGIS128_BLOCK_ALIGN 16
23#define AEGIS128_BLOCK_SIZE 16
24#define AEGIS128_NONCE_SIZE 16
25#define AEGIS128_STATE_BLOCKS 5
26#define AEGIS128_KEY_SIZE 16
27#define AEGIS128_MIN_AUTH_SIZE 8
28#define AEGIS128_MAX_AUTH_SIZE 16
29
30asmlinkage void crypto_aegis128_aesni_init(void *state, void *key, void *iv);
31
32asmlinkage void crypto_aegis128_aesni_ad(
33 void *state, unsigned int length, const void *data);
34
35asmlinkage void crypto_aegis128_aesni_enc(
36 void *state, unsigned int length, const void *src, void *dst);
37
38asmlinkage void crypto_aegis128_aesni_dec(
39 void *state, unsigned int length, const void *src, void *dst);
40
41asmlinkage void crypto_aegis128_aesni_enc_tail(
42 void *state, unsigned int length, const void *src, void *dst);
43
44asmlinkage void crypto_aegis128_aesni_dec_tail(
45 void *state, unsigned int length, const void *src, void *dst);
46
47asmlinkage void crypto_aegis128_aesni_final(
48 void *state, void *tag_xor, unsigned int cryptlen,
49 unsigned int assoclen);
50
51struct aegis_block {
52 u8 bytes[AEGIS128_BLOCK_SIZE] __aligned(AEGIS128_BLOCK_ALIGN);
53};
54
55struct aegis_state {
56 struct aegis_block blocks[AEGIS128_STATE_BLOCKS];
57};
58
59struct aegis_ctx {
60 struct aegis_block key;
61};
62
63struct aegis_crypt_ops {
64 int (*skcipher_walk_init)(struct skcipher_walk *walk,
65 struct aead_request *req, bool atomic);
66
67 void (*crypt_blocks)(void *state, unsigned int length, const void *src,
68 void *dst);
69 void (*crypt_tail)(void *state, unsigned int length, const void *src,
70 void *dst);
71};
72
73static void crypto_aegis128_aesni_process_ad(
74 struct aegis_state *state, struct scatterlist *sg_src,
75 unsigned int assoclen)
76{
77 struct scatter_walk walk;
78 struct aegis_block buf;
79 unsigned int pos = 0;
80
81 scatterwalk_start(&walk, sg_src);
82 while (assoclen != 0) {
83 unsigned int size = scatterwalk_clamp(&walk, assoclen);
84 unsigned int left = size;
85 void *mapped = scatterwalk_map(&walk);
86 const u8 *src = (const u8 *)mapped;
87
88 if (pos + size >= AEGIS128_BLOCK_SIZE) {
89 if (pos > 0) {
90 unsigned int fill = AEGIS128_BLOCK_SIZE - pos;
91 memcpy(buf.bytes + pos, src, fill);
92 crypto_aegis128_aesni_ad(state,
93 AEGIS128_BLOCK_SIZE,
94 buf.bytes);
95 pos = 0;
96 left -= fill;
97 src += fill;
98 }
99
100 crypto_aegis128_aesni_ad(state, left, src);
101
102 src += left & ~(AEGIS128_BLOCK_SIZE - 1);
103 left &= AEGIS128_BLOCK_SIZE - 1;
104 }
105
106 memcpy(buf.bytes + pos, src, left);
107 pos += left;
108 assoclen -= size;
109
110 scatterwalk_unmap(mapped);
111 scatterwalk_advance(&walk, size);
112 scatterwalk_done(&walk, 0, assoclen);
113 }
114
115 if (pos > 0) {
116 memset(buf.bytes + pos, 0, AEGIS128_BLOCK_SIZE - pos);
117 crypto_aegis128_aesni_ad(state, AEGIS128_BLOCK_SIZE, buf.bytes);
118 }
119}
120
121static void crypto_aegis128_aesni_process_crypt(
122 struct aegis_state *state, struct skcipher_walk *walk,
123 const struct aegis_crypt_ops *ops)
124{
125 while (walk->nbytes >= AEGIS128_BLOCK_SIZE) {
126 ops->crypt_blocks(state,
127 round_down(walk->nbytes, AEGIS128_BLOCK_SIZE),
128 walk->src.virt.addr, walk->dst.virt.addr);
129 skcipher_walk_done(walk, walk->nbytes % AEGIS128_BLOCK_SIZE);
130 }
131
132 if (walk->nbytes) {
133 ops->crypt_tail(state, walk->nbytes, walk->src.virt.addr,
134 walk->dst.virt.addr);
135 skcipher_walk_done(walk, 0);
136 }
137}
138
139static struct aegis_ctx *crypto_aegis128_aesni_ctx(struct crypto_aead *aead)
140{
141 u8 *ctx = crypto_aead_ctx(aead);
142 ctx = PTR_ALIGN(ctx, __alignof__(struct aegis_ctx));
143 return (void *)ctx;
144}
145
146static int crypto_aegis128_aesni_setkey(struct crypto_aead *aead, const u8 *key,
147 unsigned int keylen)
148{
149 struct aegis_ctx *ctx = crypto_aegis128_aesni_ctx(aead);
150
151 if (keylen != AEGIS128_KEY_SIZE) {
152 crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
153 return -EINVAL;
154 }
155
156 memcpy(ctx->key.bytes, key, AEGIS128_KEY_SIZE);
157
158 return 0;
159}
160
161static int crypto_aegis128_aesni_setauthsize(struct crypto_aead *tfm,
162 unsigned int authsize)
163{
164 if (authsize > AEGIS128_MAX_AUTH_SIZE)
165 return -EINVAL;
166 if (authsize < AEGIS128_MIN_AUTH_SIZE)
167 return -EINVAL;
168 return 0;
169}
170
171static void crypto_aegis128_aesni_crypt(struct aead_request *req,
172 struct aegis_block *tag_xor,
173 unsigned int cryptlen,
174 const struct aegis_crypt_ops *ops)
175{
176 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
177 struct aegis_ctx *ctx = crypto_aegis128_aesni_ctx(tfm);
178 struct skcipher_walk walk;
179 struct aegis_state state;
180
181 ops->skcipher_walk_init(&walk, req, true);
182
183 kernel_fpu_begin();
184
185 crypto_aegis128_aesni_init(&state, ctx->key.bytes, req->iv);
186 crypto_aegis128_aesni_process_ad(&state, req->src, req->assoclen);
187 crypto_aegis128_aesni_process_crypt(&state, &walk, ops);
188 crypto_aegis128_aesni_final(&state, tag_xor, req->assoclen, cryptlen);
189
190 kernel_fpu_end();
191}
192
193static int crypto_aegis128_aesni_encrypt(struct aead_request *req)
194{
195 static const struct aegis_crypt_ops OPS = {
196 .skcipher_walk_init = skcipher_walk_aead_encrypt,
197 .crypt_blocks = crypto_aegis128_aesni_enc,
198 .crypt_tail = crypto_aegis128_aesni_enc_tail,
199 };
200
201 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
202 struct aegis_block tag = {};
203 unsigned int authsize = crypto_aead_authsize(tfm);
204 unsigned int cryptlen = req->cryptlen;
205
206 crypto_aegis128_aesni_crypt(req, &tag, cryptlen, &OPS);
207
208 scatterwalk_map_and_copy(tag.bytes, req->dst,
209 req->assoclen + cryptlen, authsize, 1);
210 return 0;
211}
212
213static int crypto_aegis128_aesni_decrypt(struct aead_request *req)
214{
215 static const struct aegis_block zeros = {};
216
217 static const struct aegis_crypt_ops OPS = {
218 .skcipher_walk_init = skcipher_walk_aead_decrypt,
219 .crypt_blocks = crypto_aegis128_aesni_dec,
220 .crypt_tail = crypto_aegis128_aesni_dec_tail,
221 };
222
223 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
224 struct aegis_block tag;
225 unsigned int authsize = crypto_aead_authsize(tfm);
226 unsigned int cryptlen = req->cryptlen - authsize;
227
228 scatterwalk_map_and_copy(tag.bytes, req->src,
229 req->assoclen + cryptlen, authsize, 0);
230
231 crypto_aegis128_aesni_crypt(req, &tag, cryptlen, &OPS);
232
233 return crypto_memneq(tag.bytes, zeros.bytes, authsize) ? -EBADMSG : 0;
234}
235
236static int crypto_aegis128_aesni_init_tfm(struct crypto_aead *aead)
237{
238 return 0;
239}
240
241static void crypto_aegis128_aesni_exit_tfm(struct crypto_aead *aead)
242{
243}
244
245static int cryptd_aegis128_aesni_setkey(struct crypto_aead *aead,
246 const u8 *key, unsigned int keylen)
247{
248 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
249 struct cryptd_aead *cryptd_tfm = *ctx;
250
251 return crypto_aead_setkey(&cryptd_tfm->base, key, keylen);
252}
253
254static int cryptd_aegis128_aesni_setauthsize(struct crypto_aead *aead,
255 unsigned int authsize)
256{
257 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
258 struct cryptd_aead *cryptd_tfm = *ctx;
259
260 return crypto_aead_setauthsize(&cryptd_tfm->base, authsize);
261}
262
263static int cryptd_aegis128_aesni_encrypt(struct aead_request *req)
264{
265 struct crypto_aead *aead = crypto_aead_reqtfm(req);
266 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
267 struct cryptd_aead *cryptd_tfm = *ctx;
268
269 aead = &cryptd_tfm->base;
270 if (irq_fpu_usable() && (!in_atomic() ||
271 !cryptd_aead_queued(cryptd_tfm)))
272 aead = cryptd_aead_child(cryptd_tfm);
273
274 aead_request_set_tfm(req, aead);
275
276 return crypto_aead_encrypt(req);
277}
278
279static int cryptd_aegis128_aesni_decrypt(struct aead_request *req)
280{
281 struct crypto_aead *aead = crypto_aead_reqtfm(req);
282 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
283 struct cryptd_aead *cryptd_tfm = *ctx;
284
285 aead = &cryptd_tfm->base;
286 if (irq_fpu_usable() && (!in_atomic() ||
287 !cryptd_aead_queued(cryptd_tfm)))
288 aead = cryptd_aead_child(cryptd_tfm);
289
290 aead_request_set_tfm(req, aead);
291
292 return crypto_aead_decrypt(req);
293}
294
295static int cryptd_aegis128_aesni_init_tfm(struct crypto_aead *aead)
296{
297 struct cryptd_aead *cryptd_tfm;
298 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
299
300 cryptd_tfm = cryptd_alloc_aead("__aegis128-aesni", CRYPTO_ALG_INTERNAL,
301 CRYPTO_ALG_INTERNAL);
302 if (IS_ERR(cryptd_tfm))
303 return PTR_ERR(cryptd_tfm);
304
305 *ctx = cryptd_tfm;
306 crypto_aead_set_reqsize(aead, crypto_aead_reqsize(&cryptd_tfm->base));
307 return 0;
308}
309
310static void cryptd_aegis128_aesni_exit_tfm(struct crypto_aead *aead)
311{
312 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
313
314 cryptd_free_aead(*ctx);
315}
316
317static struct aead_alg crypto_aegis128_aesni_alg[] = {
318 {
319 .setkey = crypto_aegis128_aesni_setkey,
320 .setauthsize = crypto_aegis128_aesni_setauthsize,
321 .encrypt = crypto_aegis128_aesni_encrypt,
322 .decrypt = crypto_aegis128_aesni_decrypt,
323 .init = crypto_aegis128_aesni_init_tfm,
324 .exit = crypto_aegis128_aesni_exit_tfm,
325
326 .ivsize = AEGIS128_NONCE_SIZE,
327 .maxauthsize = AEGIS128_MAX_AUTH_SIZE,
328 .chunksize = AEGIS128_BLOCK_SIZE,
329
330 .base = {
331 .cra_flags = CRYPTO_ALG_INTERNAL,
332 .cra_blocksize = 1,
333 .cra_ctxsize = sizeof(struct aegis_ctx) +
334 __alignof__(struct aegis_ctx),
335 .cra_alignmask = 0,
336
337 .cra_name = "__aegis128",
338 .cra_driver_name = "__aegis128-aesni",
339
340 .cra_module = THIS_MODULE,
341 }
342 }, {
343 .setkey = cryptd_aegis128_aesni_setkey,
344 .setauthsize = cryptd_aegis128_aesni_setauthsize,
345 .encrypt = cryptd_aegis128_aesni_encrypt,
346 .decrypt = cryptd_aegis128_aesni_decrypt,
347 .init = cryptd_aegis128_aesni_init_tfm,
348 .exit = cryptd_aegis128_aesni_exit_tfm,
349
350 .ivsize = AEGIS128_NONCE_SIZE,
351 .maxauthsize = AEGIS128_MAX_AUTH_SIZE,
352 .chunksize = AEGIS128_BLOCK_SIZE,
353
354 .base = {
355 .cra_flags = CRYPTO_ALG_ASYNC,
356 .cra_blocksize = 1,
357 .cra_ctxsize = sizeof(struct cryptd_aead *),
358 .cra_alignmask = 0,
359
360 .cra_priority = 400,
361
362 .cra_name = "aegis128",
363 .cra_driver_name = "aegis128-aesni",
364
365 .cra_module = THIS_MODULE,
366 }
367 }
368};
369
370static int __init crypto_aegis128_aesni_module_init(void)
371{
372 if (!boot_cpu_has(X86_FEATURE_XMM2) ||
373 !boot_cpu_has(X86_FEATURE_AES) ||
374 !cpu_has_xfeatures(XFEATURE_MASK_SSE, NULL))
375 return -ENODEV;
376
377 return crypto_register_aeads(crypto_aegis128_aesni_alg,
378 ARRAY_SIZE(crypto_aegis128_aesni_alg));
379}
380
381static void __exit crypto_aegis128_aesni_module_exit(void)
382{
383 crypto_unregister_aeads(crypto_aegis128_aesni_alg,
384 ARRAY_SIZE(crypto_aegis128_aesni_alg));
385}
386
387module_init(crypto_aegis128_aesni_module_init);
388module_exit(crypto_aegis128_aesni_module_exit);
389
390MODULE_LICENSE("GPL");
391MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
392MODULE_DESCRIPTION("AEGIS-128 AEAD algorithm -- AESNI+SSE2 implementation");
393MODULE_ALIAS_CRYPTO("aegis128");
394MODULE_ALIAS_CRYPTO("aegis128-aesni");
395