Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Scalar fixed time AES core transform
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <crypto/aes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/crypto.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) static int aesti_set_key(struct crypto_tfm *tfm, const u8 *in_key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 			 unsigned int key_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	return aes_expandkey(ctx, in_key, key_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static void aesti_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	 * Temporarily disable interrupts to avoid races where cachelines are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	 * evicted when the CPU is interrupted to do something else.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	aes_encrypt(ctx, out, in);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static void aesti_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	 * Temporarily disable interrupts to avoid races where cachelines are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	 * evicted when the CPU is interrupted to do something else.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	aes_decrypt(ctx, out, in);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static struct crypto_alg aes_alg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	.cra_name			= "aes",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	.cra_driver_name		= "aes-fixed-time",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	.cra_priority			= 100 + 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	.cra_flags			= CRYPTO_ALG_TYPE_CIPHER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	.cra_blocksize			= AES_BLOCK_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	.cra_ctxsize			= sizeof(struct crypto_aes_ctx),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	.cra_module			= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	.cra_cipher.cia_min_keysize	= AES_MIN_KEY_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	.cra_cipher.cia_max_keysize	= AES_MAX_KEY_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	.cra_cipher.cia_setkey		= aesti_set_key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	.cra_cipher.cia_encrypt		= aesti_encrypt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	.cra_cipher.cia_decrypt		= aesti_decrypt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static int __init aes_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	return crypto_register_alg(&aes_alg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static void __exit aes_fini(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	crypto_unregister_alg(&aes_alg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) module_init(aes_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) module_exit(aes_fini);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) MODULE_DESCRIPTION("Generic fixed time AES");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) MODULE_LICENSE("GPL v2");