GNU Linux-libre 4.19.264-gnu1
[releases.git] / arch / arm / crypto / aes-cipher-glue.c
1 /*
2  * Scalar AES core transform
3  *
4  * Copyright (C) 2017 Linaro Ltd.
5  * Author: Ard Biesheuvel <ard.biesheuvel@linaro.org>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11
12 #include <crypto/aes.h>
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15
16 asmlinkage void __aes_arm_encrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
17 EXPORT_SYMBOL(__aes_arm_encrypt);
18
19 asmlinkage void __aes_arm_decrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
20 EXPORT_SYMBOL(__aes_arm_decrypt);
21
22 static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
23 {
24         struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
25         int rounds = 6 + ctx->key_length / 4;
26
27         __aes_arm_encrypt(ctx->key_enc, rounds, in, out);
28 }
29
30 static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
31 {
32         struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
33         int rounds = 6 + ctx->key_length / 4;
34
35         __aes_arm_decrypt(ctx->key_dec, rounds, in, out);
36 }
37
38 static struct crypto_alg aes_alg = {
39         .cra_name                       = "aes",
40         .cra_driver_name                = "aes-arm",
41         .cra_priority                   = 200,
42         .cra_flags                      = CRYPTO_ALG_TYPE_CIPHER,
43         .cra_blocksize                  = AES_BLOCK_SIZE,
44         .cra_ctxsize                    = sizeof(struct crypto_aes_ctx),
45         .cra_module                     = THIS_MODULE,
46
47         .cra_cipher.cia_min_keysize     = AES_MIN_KEY_SIZE,
48         .cra_cipher.cia_max_keysize     = AES_MAX_KEY_SIZE,
49         .cra_cipher.cia_setkey          = crypto_aes_set_key,
50         .cra_cipher.cia_encrypt         = aes_encrypt,
51         .cra_cipher.cia_decrypt         = aes_decrypt,
52
53 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
54         .cra_alignmask                  = 3,
55 #endif
56 };
57
58 static int __init aes_init(void)
59 {
60         return crypto_register_alg(&aes_alg);
61 }
62
63 static void __exit aes_fini(void)
64 {
65         crypto_unregister_alg(&aes_alg);
66 }
67
68 module_init(aes_init);
69 module_exit(aes_fini);
70
71 MODULE_DESCRIPTION("Scalar AES cipher for ARM");
72 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
73 MODULE_LICENSE("GPL v2");
74 MODULE_ALIAS_CRYPTO("aes");