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/*
* Scalar AES core transform
*
* Copyright (C) 2017 Linaro Ltd.
* Author: Ard Biesheuvel <ard.biesheuvel@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <crypto/aes.h>
#include <linux/crypto.h>
#include <linux/module.h>
asmlinkage void __aes_arm_encrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
EXPORT_SYMBOL(__aes_arm_encrypt);
asmlinkage void __aes_arm_decrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
EXPORT_SYMBOL(__aes_arm_decrypt);
static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
int rounds = 6 + ctx->key_length / 4;
__aes_arm_encrypt(ctx->key_enc, rounds, in, out);
}
static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
int rounds = 6 + ctx->key_length / 4;
__aes_arm_decrypt(ctx->key_dec, rounds, in, out);
}
static struct crypto_alg aes_alg = {
.cra_name = "aes",
.cra_driver_name = "aes-arm",
.cra_priority = 200,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
.cra_module = THIS_MODULE,
.cra_cipher.cia_min_keysize = AES_MIN_KEY_SIZE,
.cra_cipher.cia_max_keysize = AES_MAX_KEY_SIZE,
.cra_cipher.cia_setkey = crypto_aes_set_key,
.cra_cipher.cia_encrypt = aes_encrypt,
.cra_cipher.cia_decrypt = aes_decrypt,
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
.cra_alignmask = 3,
#endif
};
static int __init aes_init(void)
{
return crypto_register_alg(&aes_alg);
}
static void __exit aes_fini(void)
{
crypto_unregister_alg(&aes_alg);
}
module_init(aes_init);
module_exit(aes_fini);
MODULE_DESCRIPTION("Scalar AES cipher for ARM");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS_CRYPTO("aes");
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