2 * linux/arch/arm64/crypto/aes-glue.c - wrapper code for ARMv8 AES
4 * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
12 #include <asm/hwcap.h>
13 #include <crypto/aes.h>
14 #include <crypto/ablk_helper.h>
15 #include <crypto/algapi.h>
16 #include <linux/module.h>
17 #include <linux/cpufeature.h>
19 #include "aes-ce-setkey.h"
21 #ifdef USE_V8_CRYPTO_EXTENSIONS
24 #define aes_setkey ce_aes_setkey
25 #define aes_expandkey ce_aes_expandkey
26 #define aes_ecb_encrypt ce_aes_ecb_encrypt
27 #define aes_ecb_decrypt ce_aes_ecb_decrypt
28 #define aes_cbc_encrypt ce_aes_cbc_encrypt
29 #define aes_cbc_decrypt ce_aes_cbc_decrypt
30 #define aes_ctr_encrypt ce_aes_ctr_encrypt
31 #define aes_xts_encrypt ce_aes_xts_encrypt
32 #define aes_xts_decrypt ce_aes_xts_decrypt
33 MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 Crypto Extensions");
37 #define aes_setkey crypto_aes_set_key
38 #define aes_expandkey crypto_aes_expand_key
39 #define aes_ecb_encrypt neon_aes_ecb_encrypt
40 #define aes_ecb_decrypt neon_aes_ecb_decrypt
41 #define aes_cbc_encrypt neon_aes_cbc_encrypt
42 #define aes_cbc_decrypt neon_aes_cbc_decrypt
43 #define aes_ctr_encrypt neon_aes_ctr_encrypt
44 #define aes_xts_encrypt neon_aes_xts_encrypt
45 #define aes_xts_decrypt neon_aes_xts_decrypt
46 MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 NEON");
47 MODULE_ALIAS_CRYPTO("ecb(aes)");
48 MODULE_ALIAS_CRYPTO("cbc(aes)");
49 MODULE_ALIAS_CRYPTO("ctr(aes)");
50 MODULE_ALIAS_CRYPTO("xts(aes)");
53 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
54 MODULE_LICENSE("GPL v2");
56 /* defined in aes-modes.S */
57 asmlinkage void aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[],
58 int rounds, int blocks, int first);
59 asmlinkage void aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[],
60 int rounds, int blocks, int first);
62 asmlinkage void aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[],
63 int rounds, int blocks, u8 iv[], int first);
64 asmlinkage void aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[],
65 int rounds, int blocks, u8 iv[], int first);
67 asmlinkage void aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[],
68 int rounds, int blocks, u8 ctr[], int first);
70 asmlinkage void aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[],
71 int rounds, int blocks, u8 const rk2[], u8 iv[],
73 asmlinkage void aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[],
74 int rounds, int blocks, u8 const rk2[], u8 iv[],
77 struct crypto_aes_xts_ctx {
78 struct crypto_aes_ctx key1;
79 struct crypto_aes_ctx __aligned(8) key2;
82 static int xts_set_key(struct crypto_tfm *tfm, const u8 *in_key,
85 struct crypto_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm);
88 ret = aes_expandkey(&ctx->key1, in_key, key_len / 2);
90 ret = aes_expandkey(&ctx->key2, &in_key[key_len / 2],
95 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
99 static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
100 struct scatterlist *src, unsigned int nbytes)
102 struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
103 int err, first, rounds = 6 + ctx->key_length / 4;
104 struct blkcipher_walk walk;
107 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
108 blkcipher_walk_init(&walk, dst, src, nbytes);
109 err = blkcipher_walk_virt(desc, &walk);
112 for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
113 aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
114 (u8 *)ctx->key_enc, rounds, blocks, first);
115 err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
121 static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
122 struct scatterlist *src, unsigned int nbytes)
124 struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
125 int err, first, rounds = 6 + ctx->key_length / 4;
126 struct blkcipher_walk walk;
129 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
130 blkcipher_walk_init(&walk, dst, src, nbytes);
131 err = blkcipher_walk_virt(desc, &walk);
134 for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
135 aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
136 (u8 *)ctx->key_dec, rounds, blocks, first);
137 err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
143 static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
144 struct scatterlist *src, unsigned int nbytes)
146 struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
147 int err, first, rounds = 6 + ctx->key_length / 4;
148 struct blkcipher_walk walk;
151 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
152 blkcipher_walk_init(&walk, dst, src, nbytes);
153 err = blkcipher_walk_virt(desc, &walk);
156 for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
157 aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
158 (u8 *)ctx->key_enc, rounds, blocks, walk.iv,
160 err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
166 static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
167 struct scatterlist *src, unsigned int nbytes)
169 struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
170 int err, first, rounds = 6 + ctx->key_length / 4;
171 struct blkcipher_walk walk;
174 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
175 blkcipher_walk_init(&walk, dst, src, nbytes);
176 err = blkcipher_walk_virt(desc, &walk);
179 for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
180 aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
181 (u8 *)ctx->key_dec, rounds, blocks, walk.iv,
183 err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
189 static int ctr_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
190 struct scatterlist *src, unsigned int nbytes)
192 struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
193 int err, first, rounds = 6 + ctx->key_length / 4;
194 struct blkcipher_walk walk;
197 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
198 blkcipher_walk_init(&walk, dst, src, nbytes);
199 err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
203 while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
204 aes_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
205 (u8 *)ctx->key_enc, rounds, blocks, walk.iv,
208 nbytes -= blocks * AES_BLOCK_SIZE;
209 if (nbytes && nbytes == walk.nbytes % AES_BLOCK_SIZE)
211 err = blkcipher_walk_done(desc, &walk,
212 walk.nbytes % AES_BLOCK_SIZE);
215 u8 *tdst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE;
216 u8 *tsrc = walk.src.virt.addr + blocks * AES_BLOCK_SIZE;
217 u8 __aligned(8) tail[AES_BLOCK_SIZE];
220 * Minimum alignment is 8 bytes, so if nbytes is <= 8, we need
221 * to tell aes_ctr_encrypt() to only read half a block.
223 blocks = (nbytes <= 8) ? -1 : 1;
225 aes_ctr_encrypt(tail, tsrc, (u8 *)ctx->key_enc, rounds,
226 blocks, walk.iv, first);
227 memcpy(tdst, tail, nbytes);
228 err = blkcipher_walk_done(desc, &walk, 0);
235 static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
236 struct scatterlist *src, unsigned int nbytes)
238 struct crypto_aes_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
239 int err, first, rounds = 6 + ctx->key1.key_length / 4;
240 struct blkcipher_walk walk;
243 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
244 blkcipher_walk_init(&walk, dst, src, nbytes);
245 err = blkcipher_walk_virt(desc, &walk);
248 for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
249 aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
250 (u8 *)ctx->key1.key_enc, rounds, blocks,
251 (u8 *)ctx->key2.key_enc, walk.iv, first);
252 err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
259 static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
260 struct scatterlist *src, unsigned int nbytes)
262 struct crypto_aes_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
263 int err, first, rounds = 6 + ctx->key1.key_length / 4;
264 struct blkcipher_walk walk;
267 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
268 blkcipher_walk_init(&walk, dst, src, nbytes);
269 err = blkcipher_walk_virt(desc, &walk);
272 for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
273 aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
274 (u8 *)ctx->key1.key_dec, rounds, blocks,
275 (u8 *)ctx->key2.key_enc, walk.iv, first);
276 err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
283 static struct crypto_alg aes_algs[] = { {
284 .cra_name = "__ecb-aes-" MODE,
285 .cra_driver_name = "__driver-ecb-aes-" MODE,
287 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
289 .cra_blocksize = AES_BLOCK_SIZE,
290 .cra_ctxsize = sizeof(struct crypto_aes_ctx),
292 .cra_type = &crypto_blkcipher_type,
293 .cra_module = THIS_MODULE,
295 .min_keysize = AES_MIN_KEY_SIZE,
296 .max_keysize = AES_MAX_KEY_SIZE,
297 .ivsize = AES_BLOCK_SIZE,
298 .setkey = aes_setkey,
299 .encrypt = ecb_encrypt,
300 .decrypt = ecb_decrypt,
303 .cra_name = "__cbc-aes-" MODE,
304 .cra_driver_name = "__driver-cbc-aes-" MODE,
306 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
308 .cra_blocksize = AES_BLOCK_SIZE,
309 .cra_ctxsize = sizeof(struct crypto_aes_ctx),
311 .cra_type = &crypto_blkcipher_type,
312 .cra_module = THIS_MODULE,
314 .min_keysize = AES_MIN_KEY_SIZE,
315 .max_keysize = AES_MAX_KEY_SIZE,
316 .ivsize = AES_BLOCK_SIZE,
317 .setkey = aes_setkey,
318 .encrypt = cbc_encrypt,
319 .decrypt = cbc_decrypt,
322 .cra_name = "__ctr-aes-" MODE,
323 .cra_driver_name = "__driver-ctr-aes-" MODE,
325 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
328 .cra_ctxsize = sizeof(struct crypto_aes_ctx),
330 .cra_type = &crypto_blkcipher_type,
331 .cra_module = THIS_MODULE,
333 .min_keysize = AES_MIN_KEY_SIZE,
334 .max_keysize = AES_MAX_KEY_SIZE,
335 .ivsize = AES_BLOCK_SIZE,
336 .setkey = aes_setkey,
337 .encrypt = ctr_encrypt,
338 .decrypt = ctr_encrypt,
341 .cra_name = "__xts-aes-" MODE,
342 .cra_driver_name = "__driver-xts-aes-" MODE,
344 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
346 .cra_blocksize = AES_BLOCK_SIZE,
347 .cra_ctxsize = sizeof(struct crypto_aes_xts_ctx),
349 .cra_type = &crypto_blkcipher_type,
350 .cra_module = THIS_MODULE,
352 .min_keysize = 2 * AES_MIN_KEY_SIZE,
353 .max_keysize = 2 * AES_MAX_KEY_SIZE,
354 .ivsize = AES_BLOCK_SIZE,
355 .setkey = xts_set_key,
356 .encrypt = xts_encrypt,
357 .decrypt = xts_decrypt,
360 .cra_name = "ecb(aes)",
361 .cra_driver_name = "ecb-aes-" MODE,
362 .cra_priority = PRIO,
363 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
364 .cra_blocksize = AES_BLOCK_SIZE,
365 .cra_ctxsize = sizeof(struct async_helper_ctx),
367 .cra_type = &crypto_ablkcipher_type,
368 .cra_module = THIS_MODULE,
369 .cra_init = ablk_init,
370 .cra_exit = ablk_exit,
372 .min_keysize = AES_MIN_KEY_SIZE,
373 .max_keysize = AES_MAX_KEY_SIZE,
374 .ivsize = AES_BLOCK_SIZE,
375 .setkey = ablk_set_key,
376 .encrypt = ablk_encrypt,
377 .decrypt = ablk_decrypt,
380 .cra_name = "cbc(aes)",
381 .cra_driver_name = "cbc-aes-" MODE,
382 .cra_priority = PRIO,
383 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
384 .cra_blocksize = AES_BLOCK_SIZE,
385 .cra_ctxsize = sizeof(struct async_helper_ctx),
387 .cra_type = &crypto_ablkcipher_type,
388 .cra_module = THIS_MODULE,
389 .cra_init = ablk_init,
390 .cra_exit = ablk_exit,
392 .min_keysize = AES_MIN_KEY_SIZE,
393 .max_keysize = AES_MAX_KEY_SIZE,
394 .ivsize = AES_BLOCK_SIZE,
395 .setkey = ablk_set_key,
396 .encrypt = ablk_encrypt,
397 .decrypt = ablk_decrypt,
400 .cra_name = "ctr(aes)",
401 .cra_driver_name = "ctr-aes-" MODE,
402 .cra_priority = PRIO,
403 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
405 .cra_ctxsize = sizeof(struct async_helper_ctx),
407 .cra_type = &crypto_ablkcipher_type,
408 .cra_module = THIS_MODULE,
409 .cra_init = ablk_init,
410 .cra_exit = ablk_exit,
412 .min_keysize = AES_MIN_KEY_SIZE,
413 .max_keysize = AES_MAX_KEY_SIZE,
414 .ivsize = AES_BLOCK_SIZE,
415 .setkey = ablk_set_key,
416 .encrypt = ablk_encrypt,
417 .decrypt = ablk_decrypt,
420 .cra_name = "xts(aes)",
421 .cra_driver_name = "xts-aes-" MODE,
422 .cra_priority = PRIO,
423 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
424 .cra_blocksize = AES_BLOCK_SIZE,
425 .cra_ctxsize = sizeof(struct async_helper_ctx),
427 .cra_type = &crypto_ablkcipher_type,
428 .cra_module = THIS_MODULE,
429 .cra_init = ablk_init,
430 .cra_exit = ablk_exit,
432 .min_keysize = 2 * AES_MIN_KEY_SIZE,
433 .max_keysize = 2 * AES_MAX_KEY_SIZE,
434 .ivsize = AES_BLOCK_SIZE,
435 .setkey = ablk_set_key,
436 .encrypt = ablk_encrypt,
437 .decrypt = ablk_decrypt,
441 static int __init aes_init(void)
443 return crypto_register_algs(aes_algs, ARRAY_SIZE(aes_algs));
446 static void __exit aes_exit(void)
448 crypto_unregister_algs(aes_algs, ARRAY_SIZE(aes_algs));
451 #ifdef USE_V8_CRYPTO_EXTENSIONS
452 module_cpu_feature_match(AES, aes_init);
454 module_init(aes_init);
456 module_exit(aes_exit);