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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Handle partial blocks for block hash.
4 *
5 * Copyright (c) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
6 * Copyright (c) 2025 Herbert Xu <herbert@gondor.apana.org.au>
7 */
8
9#ifndef _CRYPTO_INTERNAL_BLOCKHASH_H
10#define _CRYPTO_INTERNAL_BLOCKHASH_H
11
12#include <linux/string.h>
13#include <linux/types.h>
14
15#define BLOCK_HASH_UPDATE_BASE(block_fn, state, src, nbytes, bs, dv, \
16 buf, buflen) \
17 ({ \
18 typeof(block_fn) *_block_fn = &(block_fn); \
19 typeof(state + 0) _state = (state); \
20 unsigned int _buflen = (buflen); \
21 size_t _nbytes = (nbytes); \
22 unsigned int _bs = (bs); \
23 const u8 *_src = (src); \
24 u8 *_buf = (buf); \
25 while ((_buflen + _nbytes) >= _bs) { \
26 const u8 *data = _src; \
27 size_t len = _nbytes; \
28 size_t blocks; \
29 int remain; \
30 if (_buflen) { \
31 remain = _bs - _buflen; \
32 memcpy(_buf + _buflen, _src, remain); \
33 data = _buf; \
34 len = _bs; \
35 } \
36 remain = len % bs; \
37 blocks = (len - remain) / (dv); \
38 (*_block_fn)(_state, data, blocks); \
39 _src += len - remain - _buflen; \
40 _nbytes -= len - remain - _buflen; \
41 _buflen = 0; \
42 } \
43 memcpy(_buf + _buflen, _src, _nbytes); \
44 _buflen += _nbytes; \
45 })
46
47#define BLOCK_HASH_UPDATE(block, state, src, nbytes, bs, buf, buflen) \
48 BLOCK_HASH_UPDATE_BASE(block, state, src, nbytes, bs, 1, buf, buflen)
49#define BLOCK_HASH_UPDATE_BLOCKS(block, state, src, nbytes, bs, buf, buflen) \
50 BLOCK_HASH_UPDATE_BASE(block, state, src, nbytes, bs, bs, buf, buflen)
51
52#endif /* _CRYPTO_INTERNAL_BLOCKHASH_H */