sha1.h

 1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 * Cryptographic API.
 4 *
 5 * SHA1 Secure Hash Algorithm.
 6 *
 7 * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
 8 *
 9 * Based on crypto/sha1_generic.c, which is:
10 *
11 * Copyright (c) Alan Smithee.
12 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
13 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
14 */
15
16#include <asm/octeon/crypto.h>
17#include <asm/octeon/octeon.h>
18
19/*
20 * We pass everything as 64-bit. OCTEON can handle misaligned data.
21 */
22
23static void octeon_sha1_store_hash(struct sha1_block_state *state)
24{
25	u64 *hash = (u64 *)&state->h[0];
26	union {
27		u32 word[2];
28		u64 dword;
29	} hash_tail = { { state->h[4], } };
30
31	write_octeon_64bit_hash_dword(hash[0], 0);
32	write_octeon_64bit_hash_dword(hash[1], 1);
33	write_octeon_64bit_hash_dword(hash_tail.dword, 2);
34	memzero_explicit(&hash_tail.word[0], sizeof(hash_tail.word[0]));
35}
36
37static void octeon_sha1_read_hash(struct sha1_block_state *state)
38{
39	u64 *hash = (u64 *)&state->h[0];
40	union {
41		u32 word[2];
42		u64 dword;
43	} hash_tail;
44
45	hash[0]		= read_octeon_64bit_hash_dword(0);
46	hash[1]		= read_octeon_64bit_hash_dword(1);
47	hash_tail.dword	= read_octeon_64bit_hash_dword(2);
48	state->h[4]	= hash_tail.word[0];
49	memzero_explicit(&hash_tail.dword, sizeof(hash_tail.dword));
50}
51
52static void sha1_blocks(struct sha1_block_state *state,
53			const u8 *data, size_t nblocks)
54{
55	struct octeon_cop2_state cop2_state;
56	unsigned long flags;
57
58	if (!octeon_has_crypto())
59		return sha1_blocks_generic(state, data, nblocks);
60
61	flags = octeon_crypto_enable(&cop2_state);
62	octeon_sha1_store_hash(state);
63
64	do {
65		const u64 *block = (const u64 *)data;
66
67		write_octeon_64bit_block_dword(block[0], 0);
68		write_octeon_64bit_block_dword(block[1], 1);
69		write_octeon_64bit_block_dword(block[2], 2);
70		write_octeon_64bit_block_dword(block[3], 3);
71		write_octeon_64bit_block_dword(block[4], 4);
72		write_octeon_64bit_block_dword(block[5], 5);
73		write_octeon_64bit_block_dword(block[6], 6);
74		octeon_sha1_start(block[7]);
75
76		data += SHA1_BLOCK_SIZE;
77	} while (--nblocks);
78
79	octeon_sha1_read_hash(state);
80	octeon_crypto_disable(&cop2_state, flags);
81}