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
14EXPORT_SYMBOL_GPL(__aes_arm_encrypt);
15EXPORT_SYMBOL_GPL(__aes_arm_decrypt);
16
17static 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
25static 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
33static 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
53static int __init aes_init(void)
54{
55 return crypto_register_alg(alg: &aes_alg);
56}
57
58static void __exit aes_fini(void)
59{
60 crypto_unregister_alg(alg: &aes_alg);
61}
62
63module_init(aes_init);
64module_exit(aes_fini);
65
66MODULE_DESCRIPTION("Scalar AES cipher for ARM");
67MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
68MODULE_LICENSE("GPL v2");
69MODULE_ALIAS_CRYPTO("aes");
70

source code of linux/arch/arm/crypto/aes-cipher-glue.c