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
13 asmlinkage void __aes_arm_encrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
14 asmlinkage void __aes_arm_decrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
15
16 static void aes_arm_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
17 {
18 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
19 int rounds = 6 + ctx->key_length / 4;
20
21 __aes_arm_encrypt(ctx->key_enc, rounds, in, out);
22 }
23
24 static void aes_arm_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
25 {
26 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
27 int rounds = 6 + ctx->key_length / 4;
28
29 __aes_arm_decrypt(ctx->key_dec, rounds, in, out);
30 }
31
32 static struct crypto_alg aes_alg = {
33 .cra_name = "aes",
34 .cra_driver_name = "aes-arm",
35 .cra_priority = 200,
36 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
37 .cra_blocksize = AES_BLOCK_SIZE,
38 .cra_ctxsize = sizeof(struct crypto_aes_ctx),
39 .cra_module = THIS_MODULE,
40
41 .cra_cipher.cia_min_keysize = AES_MIN_KEY_SIZE,
42 .cra_cipher.cia_max_keysize = AES_MAX_KEY_SIZE,
43 .cra_cipher.cia_setkey = crypto_aes_set_key,
44 .cra_cipher.cia_encrypt = aes_arm_encrypt,
45 .cra_cipher.cia_decrypt = aes_arm_decrypt,
46
47 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
48 .cra_alignmask = 3,
49 #endif
50 };
51
52 static int __init aes_init(void)
53 {
54 return crypto_register_alg(&aes_alg);
55 }
56
57 static void __exit aes_fini(void)
58 {
59 crypto_unregister_alg(&aes_alg);
60 }
61
62 module_init(aes_init);
63 module_exit(aes_fini);
64
65 MODULE_DESCRIPTION("Scalar AES cipher for ARM");
66 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
67 MODULE_LICENSE("GPL v2");
68 MODULE_ALIAS_CRYPTO("aes");
69
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.