From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- crypto/aes_ti.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 crypto/aes_ti.c (limited to 'crypto/aes_ti.c') diff --git a/crypto/aes_ti.c b/crypto/aes_ti.c new file mode 100644 index 000000000..205c2c257 --- /dev/null +++ b/crypto/aes_ti.c @@ -0,0 +1,83 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Scalar fixed time AES core transform + * + * Copyright (C) 2017 Linaro Ltd + */ + +#include +#include +#include + +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"); -- cgit v1.2.3