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
13asmlinkage void __aes_arm_encrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
14asmlinkage void __aes_arm_decrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
15
16static 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
24static 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
32static 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
52static int __init aes_init(void)
53{
54	return crypto_register_alg(&aes_alg);
55}
56
57static void __exit aes_fini(void)
58{
59	crypto_unregister_alg(&aes_alg);
60}
61
62module_init(aes_init);
63module_exit(aes_fini);
64
65MODULE_DESCRIPTION("Scalar AES cipher for ARM");
66MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
67MODULE_LICENSE("GPL v2");
68MODULE_ALIAS_CRYPTO("aes");
69