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af413d71f0
Remove the "ghash-riscv64-zvkg" crypto_shash algorithm. Move the corresponding assembly code into lib/crypto/, modify it to take the length in blocks instead of bytes, and wire it up to the GHASH library. This makes the GHASH library be optimized with the RISC-V Vector Cryptography Extension. It also greatly reduces the amount of riscv-specific glue code that is needed, and it fixes the issue where this optimized GHASH code was disabled by default. Note that this RISC-V code has multiple opportunities for improvement, such as adding more parallelism, providing an optimized multiplication function, and directly supporting POLYVAL. But for now, this commit simply tweaks ghash_zvkg() slightly to make it compatible with the library, then wires it up to ghash_blocks_arch(). ghash_preparekey_arch() is also implemented to store the copy of the raw key needed by the vghsh.vv instruction. Acked-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20260319061723.1140720-13-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* GHASH, RISC-V optimized
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*
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* Copyright (C) 2023 VRULL GmbH
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* Copyright (C) 2023 SiFive, Inc.
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* Copyright 2026 Google LLC
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*/
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#include <asm/simd.h>
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#include <asm/vector.h>
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_zvkg);
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asmlinkage void ghash_zvkg(u8 accumulator[GHASH_BLOCK_SIZE],
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const u8 key[GHASH_BLOCK_SIZE],
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const u8 *data, size_t nblocks);
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#define ghash_preparekey_arch ghash_preparekey_arch
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static void ghash_preparekey_arch(struct ghash_key *key,
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const u8 raw_key[GHASH_BLOCK_SIZE])
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{
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/* Save key in POLYVAL format for fallback */
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ghash_key_to_polyval(raw_key, &key->h);
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/* Save key in GHASH format for zvkg */
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memcpy(key->h_raw, raw_key, GHASH_BLOCK_SIZE);
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}
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#define ghash_blocks_arch ghash_blocks_arch
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static void ghash_blocks_arch(struct polyval_elem *acc,
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const struct ghash_key *key,
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const u8 *data, size_t nblocks)
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{
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if (static_branch_likely(&have_zvkg) && likely(may_use_simd())) {
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u8 ghash_acc[GHASH_BLOCK_SIZE];
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polyval_acc_to_ghash(acc, ghash_acc);
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kernel_vector_begin();
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ghash_zvkg(ghash_acc, key->h_raw, data, nblocks);
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kernel_vector_end();
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ghash_acc_to_polyval(ghash_acc, acc);
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memzero_explicit(ghash_acc, sizeof(ghash_acc));
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} else {
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ghash_blocks_generic(acc, &key->h, data, nblocks);
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}
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}
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#define gf128hash_mod_init_arch gf128hash_mod_init_arch
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static void gf128hash_mod_init_arch(void)
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{
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if (riscv_isa_extension_available(NULL, ZVKG) &&
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riscv_vector_vlen() >= 128)
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static_branch_enable(&have_zvkg);
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}
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