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4d3f9d89c7
Instead of calling into the table based scalar AES code in situations where the SIMD unit may not be used, use the generic AES code, which is more appropriate since it is less likely to be susceptible to timing attacks. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Scalar AES core transform
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*
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* Copyright (C) 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
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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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asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
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asmlinkage void __aes_arm64_decrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
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static void aes_arm64_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
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int rounds = 6 + ctx->key_length / 4;
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__aes_arm64_encrypt(ctx->key_enc, out, in, rounds);
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}
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static void aes_arm64_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
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int rounds = 6 + ctx->key_length / 4;
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__aes_arm64_decrypt(ctx->key_dec, out, in, rounds);
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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-arm64",
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.cra_priority = 200,
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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 = crypto_aes_set_key,
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.cra_cipher.cia_encrypt = aes_arm64_encrypt,
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.cra_cipher.cia_decrypt = aes_arm64_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("Scalar AES cipher for arm64");
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MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_CRYPTO("aes");
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