1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Scalar AES core transform
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2017 Linaro Ltd.
6*4882a593Smuzhiyun * Author: Ard Biesheuvel <ard.biesheuvel@linaro.org>
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <crypto/aes.h>
10*4882a593Smuzhiyun #include <linux/crypto.h>
11*4882a593Smuzhiyun #include <linux/module.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun asmlinkage void __aes_arm_encrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
14*4882a593Smuzhiyun asmlinkage void __aes_arm_decrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
15*4882a593Smuzhiyun
aes_arm_encrypt(struct crypto_tfm * tfm,u8 * out,const u8 * in)16*4882a593Smuzhiyun static void aes_arm_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
19*4882a593Smuzhiyun int rounds = 6 + ctx->key_length / 4;
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun __aes_arm_encrypt(ctx->key_enc, rounds, in, out);
22*4882a593Smuzhiyun }
23*4882a593Smuzhiyun
aes_arm_decrypt(struct crypto_tfm * tfm,u8 * out,const u8 * in)24*4882a593Smuzhiyun static void aes_arm_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
27*4882a593Smuzhiyun int rounds = 6 + ctx->key_length / 4;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun __aes_arm_decrypt(ctx->key_dec, rounds, in, out);
30*4882a593Smuzhiyun }
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun static struct crypto_alg aes_alg = {
33*4882a593Smuzhiyun .cra_name = "aes",
34*4882a593Smuzhiyun .cra_driver_name = "aes-arm",
35*4882a593Smuzhiyun .cra_priority = 200,
36*4882a593Smuzhiyun .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
37*4882a593Smuzhiyun .cra_blocksize = AES_BLOCK_SIZE,
38*4882a593Smuzhiyun .cra_ctxsize = sizeof(struct crypto_aes_ctx),
39*4882a593Smuzhiyun .cra_module = THIS_MODULE,
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun .cra_cipher.cia_min_keysize = AES_MIN_KEY_SIZE,
42*4882a593Smuzhiyun .cra_cipher.cia_max_keysize = AES_MAX_KEY_SIZE,
43*4882a593Smuzhiyun .cra_cipher.cia_setkey = crypto_aes_set_key,
44*4882a593Smuzhiyun .cra_cipher.cia_encrypt = aes_arm_encrypt,
45*4882a593Smuzhiyun .cra_cipher.cia_decrypt = aes_arm_decrypt,
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
48*4882a593Smuzhiyun .cra_alignmask = 3,
49*4882a593Smuzhiyun #endif
50*4882a593Smuzhiyun };
51*4882a593Smuzhiyun
aes_init(void)52*4882a593Smuzhiyun static int __init aes_init(void)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun return crypto_register_alg(&aes_alg);
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
aes_fini(void)57*4882a593Smuzhiyun static void __exit aes_fini(void)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun crypto_unregister_alg(&aes_alg);
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun module_init(aes_init);
63*4882a593Smuzhiyun module_exit(aes_fini);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun MODULE_DESCRIPTION("Scalar AES cipher for ARM");
66*4882a593Smuzhiyun MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
67*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
68*4882a593Smuzhiyun MODULE_ALIAS_CRYPTO("aes");
69