Quelle aes_ti.c Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Scalar fixed time AES core transform
*
* Copyright (C) 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
*/

#include <crypto/aes.h>
#include <crypto/algapi.h>
#include <linux/module.h>

static int aesti_set_key(struct crypto_tfm *tfm, const u8 *in_key,
    unsigned int key_len)
{
struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);

return aes_expandkey(ctx, in_key, key_len);
}

static void aesti_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
unsigned long flags;

/*
* Temporarily disable interrupts to avoid races where cachelines are
* evicted when the CPU is interrupted to do something else.
*/
local_irq_save(flags);

aes_encrypt(ctx, out, in);

local_irq_restore(flags);
}

static void aesti_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
unsigned long flags;

/*
* Temporarily disable interrupts to avoid races where cachelines are
* evicted when the CPU is interrupted to do something else.
*/
local_irq_save(flags);

aes_decrypt(ctx, out, in);

local_irq_restore(flags);
}

static struct crypto_alg aes_alg = {
.cra_name   = "aes",
.cra_driver_name  = "aes-fixed-time",
.cra_priority   = 100 + 1,
.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  = aesti_set_key,
.cra_cipher.cia_encrypt  = aesti_encrypt,
.cra_cipher.cia_decrypt  = aesti_decrypt
};

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("Generic fixed time AES");
MODULE_AUTHOR("Ard Biesheuvel ");
MODULE_LICENSE("GPL v2");

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