sha256.h

 1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 * SHA-256 Secure Hash Algorithm.
 4 *
 5 * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
 6 *
 7 * Based on crypto/sha256_generic.c, which is:
 8 *
 9 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
10 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
11 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
12 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
13 */
14
15#include <asm/octeon/crypto.h>
16#include <asm/octeon/octeon.h>
17
18/*
19 * We pass everything as 64-bit. OCTEON can handle misaligned data.
20 */
21
22static void sha256_blocks(struct sha256_block_state *state,
23			  const u8 *data, size_t nblocks)
24{
25	struct octeon_cop2_state cop2_state;
26	u64 *state64 = (u64 *)state;
27	unsigned long flags;
28
29	if (!octeon_has_crypto())
30		return sha256_blocks_generic(state, data, nblocks);
31
32	flags = octeon_crypto_enable(&cop2_state);
33	write_octeon_64bit_hash_dword(state64[0], 0);
34	write_octeon_64bit_hash_dword(state64[1], 1);
35	write_octeon_64bit_hash_dword(state64[2], 2);
36	write_octeon_64bit_hash_dword(state64[3], 3);
37
38	do {
39		const u64 *block = (const u64 *)data;
40
41		write_octeon_64bit_block_dword(block[0], 0);
42		write_octeon_64bit_block_dword(block[1], 1);
43		write_octeon_64bit_block_dword(block[2], 2);
44		write_octeon_64bit_block_dword(block[3], 3);
45		write_octeon_64bit_block_dword(block[4], 4);
46		write_octeon_64bit_block_dword(block[5], 5);
47		write_octeon_64bit_block_dword(block[6], 6);
48		octeon_sha256_start(block[7]);
49
50		data += SHA256_BLOCK_SIZE;
51	} while (--nblocks);
52
53	state64[0] = read_octeon_64bit_hash_dword(0);
54	state64[1] = read_octeon_64bit_hash_dword(1);
55	state64[2] = read_octeon_64bit_hash_dword(2);
56	state64[3] = read_octeon_64bit_hash_dword(3);
57	octeon_crypto_disable(&cop2_state, flags);
58}