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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Scalar fixed time AES core transform
- *
- * Copyright (C) 2017 Linaro Ltd <[email protected]>
- */
- #include <crypto/aes.h>
- #include <linux/crypto.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 <[email protected]>");
- MODULE_LICENSE("GPL v2");
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