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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
81edb426 AB |
2 | /* |
3 | * Scalar AES core transform | |
4 | * | |
5 | * Copyright (C) 2017 Linaro Ltd. | |
6 | * Author: Ard Biesheuvel <ard.biesheuvel@linaro.org> | |
81edb426 AB |
7 | */ |
8 | ||
9 | #include <crypto/aes.h> | |
14386d47 | 10 | #include <crypto/algapi.h> |
81edb426 AB |
11 | #include <linux/module.h> |
12 | ||
13 | asmlinkage void __aes_arm_encrypt(u32 *rk, int rounds, const u8 *in, u8 *out); | |
81edb426 | 14 | asmlinkage void __aes_arm_decrypt(u32 *rk, int rounds, const u8 *in, u8 *out); |
81edb426 | 15 | |
724ecd3c | 16 | static void aes_arm_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) |
81edb426 AB |
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 | ||
724ecd3c | 24 | static void aes_arm_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) |
81edb426 AB |
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, | |
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44 | .cra_cipher.cia_encrypt = aes_arm_encrypt, |
45 | .cra_cipher.cia_decrypt = aes_arm_decrypt, | |
81edb426 AB |
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"); |