/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Handle partial blocks for block hash. * * Copyright (c) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> * Copyright (c) 2025 Herbert Xu <herbert@gondor.apana.org.au> */ #ifndef _CRYPTO_INTERNAL_BLOCKHASH_H #define _CRYPTO_INTERNAL_BLOCKHASH_H #include <linux/string.h> #include <linux/types.h> #define BLOCK_HASH_UPDATE_BASE(block_fn, state, src, nbytes, bs, dv, \ buf, buflen) \ ({ \ typeof(block_fn) *_block_fn = &(block_fn); \ typeof(state + 0) _state = (state); \ unsigned int _buflen = (buflen); \ size_t _nbytes = (nbytes); \ unsigned int _bs = (bs); \ const u8 *_src = (src); \ u8 *_buf = (buf); \ while ((_buflen + _nbytes) >= _bs) { \ const u8 *data = _src; \ size_t len = _nbytes; \ size_t blocks; \ int remain; \ if (_buflen) { \ remain = _bs - _buflen; \ memcpy(_buf + _buflen, _src, remain); \ data = _buf; \ len = _bs; \ } \ remain = len % bs; \ blocks = (len - remain) / (dv); \ (*_block_fn)(_state, data, blocks); \ _src += len - remain - _buflen; \ _nbytes -= len - remain - _buflen; \ _buflen = 0; \ } \ memcpy(_buf + _buflen, _src, _nbytes); \ _buflen += _nbytes; \ }) #define BLOCK_HASH_UPDATE(block, state, src, nbytes, bs, buf, buflen) \ BLOCK_HASH_UPDATE_BASE(block, state, src, nbytes, bs, 1, buf, buflen) #define BLOCK_HASH_UPDATE_BLOCKS(block, state, src, nbytes, bs, buf, buflen) \ BLOCK_HASH_UPDATE_BASE(block, state, src, nbytes, bs, bs, buf, buflen) #endif /* _CRYPTO_INTERNAL_BLOCKHASH_H */