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83 lines
2.0 KiB
83 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Scalar fixed time AES core transform |
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* |
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* Copyright (C) 2017 Linaro Ltd <[email protected]> |
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*/ |
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#include <crypto/aes.h> |
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#include <linux/crypto.h> |
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#include <linux/module.h> |
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static int aesti_set_key(struct crypto_tfm *tfm, const u8 *in_key, |
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unsigned int key_len) |
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{ |
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struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); |
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return aes_expandkey(ctx, in_key, key_len); |
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} |
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static void aesti_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) |
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{ |
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const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); |
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unsigned long flags; |
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/* |
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* Temporarily disable interrupts to avoid races where cachelines are |
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* evicted when the CPU is interrupted to do something else. |
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*/ |
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local_irq_save(flags); |
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aes_encrypt(ctx, out, in); |
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local_irq_restore(flags); |
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} |
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static void aesti_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) |
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{ |
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const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); |
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unsigned long flags; |
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/* |
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* Temporarily disable interrupts to avoid races where cachelines are |
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* evicted when the CPU is interrupted to do something else. |
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*/ |
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local_irq_save(flags); |
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aes_decrypt(ctx, out, in); |
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local_irq_restore(flags); |
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} |
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static struct crypto_alg aes_alg = { |
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.cra_name = "aes", |
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.cra_driver_name = "aes-fixed-time", |
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.cra_priority = 100 + 1, |
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
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.cra_blocksize = AES_BLOCK_SIZE, |
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.cra_ctxsize = sizeof(struct crypto_aes_ctx), |
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.cra_module = THIS_MODULE, |
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.cra_cipher.cia_min_keysize = AES_MIN_KEY_SIZE, |
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.cra_cipher.cia_max_keysize = AES_MAX_KEY_SIZE, |
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.cra_cipher.cia_setkey = aesti_set_key, |
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.cra_cipher.cia_encrypt = aesti_encrypt, |
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.cra_cipher.cia_decrypt = aesti_decrypt |
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}; |
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static int __init aes_init(void) |
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{ |
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return crypto_register_alg(&aes_alg); |
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} |
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static void __exit aes_fini(void) |
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{ |
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crypto_unregister_alg(&aes_alg); |
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} |
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module_init(aes_init); |
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module_exit(aes_fini); |
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MODULE_DESCRIPTION("Generic fixed time AES"); |
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MODULE_AUTHOR("Ard Biesheuvel <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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