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e96cb9507f
Consolidate the CPU-based SHA-256 code into a single module, following what I did with SHA-512: - Each arch now provides a header file lib/crypto/$(SRCARCH)/sha256.h, replacing lib/crypto/$(SRCARCH)/sha256.c. The header defines sha256_blocks() and optionally sha256_mod_init_arch(). It is included by lib/crypto/sha256.c, and thus the code gets built into the single libsha256 module, with proper inlining and dead code elimination. - sha256_blocks_generic() is moved from lib/crypto/sha256-generic.c into lib/crypto/sha256.c. It's now a static function marked with __maybe_unused, so the compiler automatically eliminates it in any cases where it's not used. - Whether arch-optimized SHA-256 is buildable is now controlled centrally by lib/crypto/Kconfig instead of by lib/crypto/$(SRCARCH)/Kconfig. The conditions for enabling it remain the same as before, and it remains enabled by default. - Any additional arch-specific translation units for the optimized SHA-256 code (such as assembly files) are now compiled by lib/crypto/Makefile instead of lib/crypto/$(SRCARCH)/Makefile. Acked-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250630160645.3198-13-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* SHA-256 Secure Hash Algorithm.
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*
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* Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
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*
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* Based on crypto/sha256_generic.c, which is:
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*
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* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
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* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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* SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
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*/
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#include <asm/octeon/crypto.h>
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#include <asm/octeon/octeon.h>
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/*
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* We pass everything as 64-bit. OCTEON can handle misaligned data.
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*/
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static void sha256_blocks(struct sha256_block_state *state,
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const u8 *data, size_t nblocks)
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{
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struct octeon_cop2_state cop2_state;
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u64 *state64 = (u64 *)state;
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unsigned long flags;
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if (!octeon_has_crypto())
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return sha256_blocks_generic(state, data, nblocks);
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flags = octeon_crypto_enable(&cop2_state);
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write_octeon_64bit_hash_dword(state64[0], 0);
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write_octeon_64bit_hash_dword(state64[1], 1);
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write_octeon_64bit_hash_dword(state64[2], 2);
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write_octeon_64bit_hash_dword(state64[3], 3);
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do {
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const u64 *block = (const u64 *)data;
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write_octeon_64bit_block_dword(block[0], 0);
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write_octeon_64bit_block_dword(block[1], 1);
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write_octeon_64bit_block_dword(block[2], 2);
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write_octeon_64bit_block_dword(block[3], 3);
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write_octeon_64bit_block_dword(block[4], 4);
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write_octeon_64bit_block_dword(block[5], 5);
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write_octeon_64bit_block_dword(block[6], 6);
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octeon_sha256_start(block[7]);
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data += SHA256_BLOCK_SIZE;
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} while (--nblocks);
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state64[0] = read_octeon_64bit_hash_dword(0);
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state64[1] = read_octeon_64bit_hash_dword(1);
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state64[2] = read_octeon_64bit_hash_dword(2);
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state64[3] = read_octeon_64bit_hash_dword(3);
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octeon_crypto_disable(&cop2_state, flags);
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}
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