198429631a
Provide a version of the core AES transform to the aegis128 SIMD code that does not rely on the special AES instructions, but uses plain NEON instructions instead. This allows the SIMD version of the aegis128 driver to be used on arm64 systems that do not implement those instructions (which are not mandatory in the architecture), such as the Raspberry Pi 3. Since GCC makes a mess of this when using the tbl/tbx intrinsics to perform the sbox substitution, preload the Sbox into v16..v31 in this case and use inline asm to emit the tbl/tbx instructions. Clang does not support this approach, nor does it require it, since it does a much better job at code generation, so there we use the intrinsics as usual. Cc: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2019 Linaro Ltd <ard.biesheuvel@linaro.org>
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*/
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#include <asm/cpufeature.h>
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#include <asm/neon.h>
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#include "aegis.h"
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void crypto_aegis128_update_neon(void *state, const void *msg);
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void crypto_aegis128_encrypt_chunk_neon(void *state, void *dst, const void *src,
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unsigned int size);
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void crypto_aegis128_decrypt_chunk_neon(void *state, void *dst, const void *src,
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unsigned int size);
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int aegis128_have_aes_insn __ro_after_init;
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bool crypto_aegis128_have_simd(void)
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{
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if (cpu_have_feature(cpu_feature(AES))) {
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aegis128_have_aes_insn = 1;
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return true;
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}
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return IS_ENABLED(CONFIG_ARM64);
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}
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void crypto_aegis128_update_simd(union aegis_block *state, const void *msg)
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{
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kernel_neon_begin();
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crypto_aegis128_update_neon(state, msg);
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kernel_neon_end();
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}
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void crypto_aegis128_encrypt_chunk_simd(union aegis_block *state, u8 *dst,
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const u8 *src, unsigned int size)
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{
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kernel_neon_begin();
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crypto_aegis128_encrypt_chunk_neon(state, dst, src, size);
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kernel_neon_end();
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}
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void crypto_aegis128_decrypt_chunk_simd(union aegis_block *state, u8 *dst,
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const u8 *src, unsigned int size)
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{
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kernel_neon_begin();
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crypto_aegis128_decrypt_chunk_neon(state, dst, src, size);
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kernel_neon_end();
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}
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