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Linux kernel mirror (for testing)
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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 <linux/crypto.h>
11#include <linux/module.h>
12
13asmlinkage void __aes_arm_encrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
14EXPORT_SYMBOL(__aes_arm_encrypt);
15
16asmlinkage void __aes_arm_decrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
17EXPORT_SYMBOL(__aes_arm_decrypt);
18
19static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
20{
21 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
22 int rounds = 6 + ctx->key_length / 4;
23
24 __aes_arm_encrypt(ctx->key_enc, rounds, in, out);
25}
26
27static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
28{
29 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
30 int rounds = 6 + ctx->key_length / 4;
31
32 __aes_arm_decrypt(ctx->key_dec, rounds, in, out);
33}
34
35static struct crypto_alg aes_alg = {
36 .cra_name = "aes",
37 .cra_driver_name = "aes-arm",
38 .cra_priority = 200,
39 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
40 .cra_blocksize = AES_BLOCK_SIZE,
41 .cra_ctxsize = sizeof(struct crypto_aes_ctx),
42 .cra_module = THIS_MODULE,
43
44 .cra_cipher.cia_min_keysize = AES_MIN_KEY_SIZE,
45 .cra_cipher.cia_max_keysize = AES_MAX_KEY_SIZE,
46 .cra_cipher.cia_setkey = crypto_aes_set_key,
47 .cra_cipher.cia_encrypt = aes_encrypt,
48 .cra_cipher.cia_decrypt = aes_decrypt,
49
50#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
51 .cra_alignmask = 3,
52#endif
53};
54
55static int __init aes_init(void)
56{
57 return crypto_register_alg(&aes_alg);
58}
59
60static void __exit aes_fini(void)
61{
62 crypto_unregister_alg(&aes_alg);
63}
64
65module_init(aes_init);
66module_exit(aes_fini);
67
68MODULE_DESCRIPTION("Scalar AES cipher for ARM");
69MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
70MODULE_LICENSE("GPL v2");
71MODULE_ALIAS_CRYPTO("aes");