aes-cipher-glue.c

 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(&aes_alg);
56}
57
58static void __exit aes_fini(void)
59{
60	crypto_unregister_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");