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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 AEGIS128L_BLOCK_ALIGN 16
23#define AEGIS128L_BLOCK_SIZE 32
24#define AEGIS128L_NONCE_SIZE 16
25#define AEGIS128L_STATE_BLOCKS 8
26#define AEGIS128L_KEY_SIZE 16
27#define AEGIS128L_MIN_AUTH_SIZE 8
28#define AEGIS128L_MAX_AUTH_SIZE 16
29
30asmlinkage void crypto_aegis128l_aesni_init(void *state, void *key, void *iv);
31
32asmlinkage void crypto_aegis128l_aesni_ad(
33 void *state, unsigned int length, const void *data);
34
35asmlinkage void crypto_aegis128l_aesni_enc(
36 void *state, unsigned int length, const void *src, void *dst);
37
38asmlinkage void crypto_aegis128l_aesni_dec(
39 void *state, unsigned int length, const void *src, void *dst);
40
41asmlinkage void crypto_aegis128l_aesni_enc_tail(
42 void *state, unsigned int length, const void *src, void *dst);
43
44asmlinkage void crypto_aegis128l_aesni_dec_tail(
45 void *state, unsigned int length, const void *src, void *dst);
46
47asmlinkage void crypto_aegis128l_aesni_final(
48 void *state, void *tag_xor, unsigned int cryptlen,
49 unsigned int assoclen);
50
51struct aegis_block {
52 u8 bytes[AEGIS128L_BLOCK_SIZE] __aligned(AEGIS128L_BLOCK_ALIGN);
53};
54
55struct aegis_state {
56 struct aegis_block blocks[AEGIS128L_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_aegis128l_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 >= AEGIS128L_BLOCK_SIZE) {
89 if (pos > 0) {
90 unsigned int fill = AEGIS128L_BLOCK_SIZE - pos;
91 memcpy(buf.bytes + pos, src, fill);
92 crypto_aegis128l_aesni_ad(state,
93 AEGIS128L_BLOCK_SIZE,
94 buf.bytes);
95 pos = 0;
96 left -= fill;
97 src += fill;
98 }
99
100 crypto_aegis128l_aesni_ad(state, left, src);
101
102 src += left & ~(AEGIS128L_BLOCK_SIZE - 1);
103 left &= AEGIS128L_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, AEGIS128L_BLOCK_SIZE - pos);
117 crypto_aegis128l_aesni_ad(state, AEGIS128L_BLOCK_SIZE, buf.bytes);
118 }
119}
120
121static void crypto_aegis128l_aesni_process_crypt(
122 struct aegis_state *state, struct aead_request *req,
123 const struct aegis_crypt_ops *ops)
124{
125 struct skcipher_walk walk;
126 u8 *src, *dst;
127 unsigned int chunksize, base;
128
129 ops->skcipher_walk_init(&walk, req, false);
130
131 while (walk.nbytes) {
132 src = walk.src.virt.addr;
133 dst = walk.dst.virt.addr;
134 chunksize = walk.nbytes;
135
136 ops->crypt_blocks(state, chunksize, src, dst);
137
138 base = chunksize & ~(AEGIS128L_BLOCK_SIZE - 1);
139 src += base;
140 dst += base;
141 chunksize &= AEGIS128L_BLOCK_SIZE - 1;
142
143 if (chunksize > 0)
144 ops->crypt_tail(state, chunksize, src, dst);
145
146 skcipher_walk_done(&walk, 0);
147 }
148}
149
150static struct aegis_ctx *crypto_aegis128l_aesni_ctx(struct crypto_aead *aead)
151{
152 u8 *ctx = crypto_aead_ctx(aead);
153 ctx = PTR_ALIGN(ctx, __alignof__(struct aegis_ctx));
154 return (void *)ctx;
155}
156
157static int crypto_aegis128l_aesni_setkey(struct crypto_aead *aead,
158 const u8 *key, unsigned int keylen)
159{
160 struct aegis_ctx *ctx = crypto_aegis128l_aesni_ctx(aead);
161
162 if (keylen != AEGIS128L_KEY_SIZE) {
163 crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
164 return -EINVAL;
165 }
166
167 memcpy(ctx->key.bytes, key, AEGIS128L_KEY_SIZE);
168
169 return 0;
170}
171
172static int crypto_aegis128l_aesni_setauthsize(struct crypto_aead *tfm,
173 unsigned int authsize)
174{
175 if (authsize > AEGIS128L_MAX_AUTH_SIZE)
176 return -EINVAL;
177 if (authsize < AEGIS128L_MIN_AUTH_SIZE)
178 return -EINVAL;
179 return 0;
180}
181
182static void crypto_aegis128l_aesni_crypt(struct aead_request *req,
183 struct aegis_block *tag_xor,
184 unsigned int cryptlen,
185 const struct aegis_crypt_ops *ops)
186{
187 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
188 struct aegis_ctx *ctx = crypto_aegis128l_aesni_ctx(tfm);
189 struct aegis_state state;
190
191 kernel_fpu_begin();
192
193 crypto_aegis128l_aesni_init(&state, ctx->key.bytes, req->iv);
194 crypto_aegis128l_aesni_process_ad(&state, req->src, req->assoclen);
195 crypto_aegis128l_aesni_process_crypt(&state, req, ops);
196 crypto_aegis128l_aesni_final(&state, tag_xor, req->assoclen, cryptlen);
197
198 kernel_fpu_end();
199}
200
201static int crypto_aegis128l_aesni_encrypt(struct aead_request *req)
202{
203 static const struct aegis_crypt_ops OPS = {
204 .skcipher_walk_init = skcipher_walk_aead_encrypt,
205 .crypt_blocks = crypto_aegis128l_aesni_enc,
206 .crypt_tail = crypto_aegis128l_aesni_enc_tail,
207 };
208
209 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
210 struct aegis_block tag = {};
211 unsigned int authsize = crypto_aead_authsize(tfm);
212 unsigned int cryptlen = req->cryptlen;
213
214 crypto_aegis128l_aesni_crypt(req, &tag, cryptlen, &OPS);
215
216 scatterwalk_map_and_copy(tag.bytes, req->dst,
217 req->assoclen + cryptlen, authsize, 1);
218 return 0;
219}
220
221static int crypto_aegis128l_aesni_decrypt(struct aead_request *req)
222{
223 static const struct aegis_block zeros = {};
224
225 static const struct aegis_crypt_ops OPS = {
226 .skcipher_walk_init = skcipher_walk_aead_decrypt,
227 .crypt_blocks = crypto_aegis128l_aesni_dec,
228 .crypt_tail = crypto_aegis128l_aesni_dec_tail,
229 };
230
231 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
232 struct aegis_block tag;
233 unsigned int authsize = crypto_aead_authsize(tfm);
234 unsigned int cryptlen = req->cryptlen - authsize;
235
236 scatterwalk_map_and_copy(tag.bytes, req->src,
237 req->assoclen + cryptlen, authsize, 0);
238
239 crypto_aegis128l_aesni_crypt(req, &tag, cryptlen, &OPS);
240
241 return crypto_memneq(tag.bytes, zeros.bytes, authsize) ? -EBADMSG : 0;
242}
243
244static int crypto_aegis128l_aesni_init_tfm(struct crypto_aead *aead)
245{
246 return 0;
247}
248
249static void crypto_aegis128l_aesni_exit_tfm(struct crypto_aead *aead)
250{
251}
252
253static int cryptd_aegis128l_aesni_setkey(struct crypto_aead *aead,
254 const u8 *key, unsigned int keylen)
255{
256 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
257 struct cryptd_aead *cryptd_tfm = *ctx;
258
259 return crypto_aead_setkey(&cryptd_tfm->base, key, keylen);
260}
261
262static int cryptd_aegis128l_aesni_setauthsize(struct crypto_aead *aead,
263 unsigned int authsize)
264{
265 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
266 struct cryptd_aead *cryptd_tfm = *ctx;
267
268 return crypto_aead_setauthsize(&cryptd_tfm->base, authsize);
269}
270
271static int cryptd_aegis128l_aesni_encrypt(struct aead_request *req)
272{
273 struct crypto_aead *aead = crypto_aead_reqtfm(req);
274 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
275 struct cryptd_aead *cryptd_tfm = *ctx;
276
277 aead = &cryptd_tfm->base;
278 if (irq_fpu_usable() && (!in_atomic() ||
279 !cryptd_aead_queued(cryptd_tfm)))
280 aead = cryptd_aead_child(cryptd_tfm);
281
282 aead_request_set_tfm(req, aead);
283
284 return crypto_aead_encrypt(req);
285}
286
287static int cryptd_aegis128l_aesni_decrypt(struct aead_request *req)
288{
289 struct crypto_aead *aead = crypto_aead_reqtfm(req);
290 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
291 struct cryptd_aead *cryptd_tfm = *ctx;
292
293 aead = &cryptd_tfm->base;
294 if (irq_fpu_usable() && (!in_atomic() ||
295 !cryptd_aead_queued(cryptd_tfm)))
296 aead = cryptd_aead_child(cryptd_tfm);
297
298 aead_request_set_tfm(req, aead);
299
300 return crypto_aead_decrypt(req);
301}
302
303static int cryptd_aegis128l_aesni_init_tfm(struct crypto_aead *aead)
304{
305 struct cryptd_aead *cryptd_tfm;
306 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
307
308 cryptd_tfm = cryptd_alloc_aead("__aegis128l-aesni", CRYPTO_ALG_INTERNAL,
309 CRYPTO_ALG_INTERNAL);
310 if (IS_ERR(cryptd_tfm))
311 return PTR_ERR(cryptd_tfm);
312
313 *ctx = cryptd_tfm;
314 crypto_aead_set_reqsize(aead, crypto_aead_reqsize(&cryptd_tfm->base));
315 return 0;
316}
317
318static void cryptd_aegis128l_aesni_exit_tfm(struct crypto_aead *aead)
319{
320 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
321
322 cryptd_free_aead(*ctx);
323}
324
325static struct aead_alg crypto_aegis128l_aesni_alg[] = {
326 {
327 .setkey = crypto_aegis128l_aesni_setkey,
328 .setauthsize = crypto_aegis128l_aesni_setauthsize,
329 .encrypt = crypto_aegis128l_aesni_encrypt,
330 .decrypt = crypto_aegis128l_aesni_decrypt,
331 .init = crypto_aegis128l_aesni_init_tfm,
332 .exit = crypto_aegis128l_aesni_exit_tfm,
333
334 .ivsize = AEGIS128L_NONCE_SIZE,
335 .maxauthsize = AEGIS128L_MAX_AUTH_SIZE,
336 .chunksize = AEGIS128L_BLOCK_SIZE,
337
338 .base = {
339 .cra_flags = CRYPTO_ALG_INTERNAL,
340 .cra_blocksize = 1,
341 .cra_ctxsize = sizeof(struct aegis_ctx) +
342 __alignof__(struct aegis_ctx),
343 .cra_alignmask = 0,
344
345 .cra_name = "__aegis128l",
346 .cra_driver_name = "__aegis128l-aesni",
347
348 .cra_module = THIS_MODULE,
349 }
350 }, {
351 .setkey = cryptd_aegis128l_aesni_setkey,
352 .setauthsize = cryptd_aegis128l_aesni_setauthsize,
353 .encrypt = cryptd_aegis128l_aesni_encrypt,
354 .decrypt = cryptd_aegis128l_aesni_decrypt,
355 .init = cryptd_aegis128l_aesni_init_tfm,
356 .exit = cryptd_aegis128l_aesni_exit_tfm,
357
358 .ivsize = AEGIS128L_NONCE_SIZE,
359 .maxauthsize = AEGIS128L_MAX_AUTH_SIZE,
360 .chunksize = AEGIS128L_BLOCK_SIZE,
361
362 .base = {
363 .cra_flags = CRYPTO_ALG_ASYNC,
364 .cra_blocksize = 1,
365 .cra_ctxsize = sizeof(struct cryptd_aead *),
366 .cra_alignmask = 0,
367
368 .cra_priority = 400,
369
370 .cra_name = "aegis128l",
371 .cra_driver_name = "aegis128l-aesni",
372
373 .cra_module = THIS_MODULE,
374 }
375 }
376};
377
378static int __init crypto_aegis128l_aesni_module_init(void)
379{
380 if (!boot_cpu_has(X86_FEATURE_XMM2) ||
381 !boot_cpu_has(X86_FEATURE_AES) ||
382 !cpu_has_xfeatures(XFEATURE_MASK_SSE, NULL))
383 return -ENODEV;
384
385 return crypto_register_aeads(crypto_aegis128l_aesni_alg,
386 ARRAY_SIZE(crypto_aegis128l_aesni_alg));
387}
388
389static void __exit crypto_aegis128l_aesni_module_exit(void)
390{
391 crypto_unregister_aeads(crypto_aegis128l_aesni_alg,
392 ARRAY_SIZE(crypto_aegis128l_aesni_alg));
393}
394
395module_init(crypto_aegis128l_aesni_module_init);
396module_exit(crypto_aegis128l_aesni_module_exit);
397
398MODULE_LICENSE("GPL");
399MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
400MODULE_DESCRIPTION("AEGIS-128L AEAD algorithm -- AESNI+SSE2 implementation");
401MODULE_ALIAS_CRYPTO("aegis128l");
402MODULE_ALIAS_CRYPTO("aegis128l-aesni");
403
