mirror of https://github.com/torvalds/linux.git
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* AES block cipher, optimized for ARM
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*
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* Copyright (C) 2017 Linaro Ltd.
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* Copyright 2026 Google LLC
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*/
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asmlinkage void __aes_arm_encrypt(const u32 rk[], int rounds,
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const u8 in[AES_BLOCK_SIZE],
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u8 out[AES_BLOCK_SIZE]);
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asmlinkage void __aes_arm_decrypt(const u32 inv_rk[], int rounds,
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const u8 in[AES_BLOCK_SIZE],
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u8 out[AES_BLOCK_SIZE]);
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static void aes_preparekey_arch(union aes_enckey_arch *k,
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union aes_invkey_arch *inv_k,
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const u8 *in_key, int key_len, int nrounds)
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{
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aes_expandkey_generic(k->rndkeys, inv_k ? inv_k->inv_rndkeys : NULL,
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in_key, key_len);
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}
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static void aes_encrypt_arch(const struct aes_enckey *key,
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u8 out[AES_BLOCK_SIZE],
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const u8 in[AES_BLOCK_SIZE])
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{
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if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
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!IS_ALIGNED((uintptr_t)out | (uintptr_t)in, 4)) {
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u8 bounce_buf[AES_BLOCK_SIZE] __aligned(4);
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memcpy(bounce_buf, in, AES_BLOCK_SIZE);
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__aes_arm_encrypt(key->k.rndkeys, key->nrounds, bounce_buf,
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bounce_buf);
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memcpy(out, bounce_buf, AES_BLOCK_SIZE);
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return;
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}
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__aes_arm_encrypt(key->k.rndkeys, key->nrounds, in, out);
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}
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static void aes_decrypt_arch(const struct aes_key *key,
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u8 out[AES_BLOCK_SIZE],
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const u8 in[AES_BLOCK_SIZE])
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{
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if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
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!IS_ALIGNED((uintptr_t)out | (uintptr_t)in, 4)) {
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u8 bounce_buf[AES_BLOCK_SIZE] __aligned(4);
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memcpy(bounce_buf, in, AES_BLOCK_SIZE);
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__aes_arm_decrypt(key->inv_k.inv_rndkeys, key->nrounds,
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bounce_buf, bounce_buf);
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memcpy(out, bounce_buf, AES_BLOCK_SIZE);
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return;
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}
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__aes_arm_decrypt(key->inv_k.inv_rndkeys, key->nrounds, in, out);
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}
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