1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Scalar AES core transform
4 *
5 * Copyright (C) 2017 Linaro Ltd.
6 * Author: Ard Biesheuvel <ard.biesheuvel@linaro.org>
7 */
8
9 #include <crypto/aes.h>
10 #include <crypto/algapi.h>
11 #include <linux/module.h>
12 #include "aes-cipher.h"
13
14 EXPORT_SYMBOL_GPL(__aes_arm_encrypt);
15 EXPORT_SYMBOL_GPL(__aes_arm_decrypt);
16
aes_arm_encrypt(struct crypto_tfm * tfm,u8 * out,const u8 * in)17 static void aes_arm_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
18 {
19 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
20 int rounds = 6 + ctx->key_length / 4;
21
22 __aes_arm_encrypt(ctx->key_enc, rounds, in, out);
23 }
24
aes_arm_decrypt(struct crypto_tfm * tfm,u8 * out,const u8 * in)25 static void aes_arm_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
26 {
27 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
28 int rounds = 6 + ctx->key_length / 4;
29
30 __aes_arm_decrypt(ctx->key_dec, rounds, in, out);
31 }
32
33 static struct crypto_alg aes_alg = {
34 .cra_name = "aes",
35 .cra_driver_name = "aes-arm",
36 .cra_priority = 200,
37 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
38 .cra_blocksize = AES_BLOCK_SIZE,
39 .cra_ctxsize = sizeof(struct crypto_aes_ctx),
40 .cra_module = THIS_MODULE,
41
42 .cra_cipher.cia_min_keysize = AES_MIN_KEY_SIZE,
43 .cra_cipher.cia_max_keysize = AES_MAX_KEY_SIZE,
44 .cra_cipher.cia_setkey = crypto_aes_set_key,
45 .cra_cipher.cia_encrypt = aes_arm_encrypt,
46 .cra_cipher.cia_decrypt = aes_arm_decrypt,
47
48 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
49 .cra_alignmask = 3,
50 #endif
51 };
52
aes_init(void)53 static int __init aes_init(void)
54 {
55 return crypto_register_alg(&aes_alg);
56 }
57
aes_fini(void)58 static void __exit aes_fini(void)
59 {
60 crypto_unregister_alg(&aes_alg);
61 }
62
63 module_init(aes_init);
64 module_exit(aes_fini);
65
66 MODULE_DESCRIPTION("Scalar AES cipher for ARM");
67 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
68 MODULE_LICENSE("GPL v2");
69 MODULE_ALIAS_CRYPTO("aes");
70