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74a43a2cf5
Extract the common partial block handling into a helper macro that can be reused by other library code. Also delete the unused sha256_base_do_finalize function. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Handle partial blocks for block hash.
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*
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* Copyright (c) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
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* Copyright (c) 2025 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#ifndef _CRYPTO_INTERNAL_BLOCKHASH_H
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#define _CRYPTO_INTERNAL_BLOCKHASH_H
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#include <linux/string.h>
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#include <linux/types.h>
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#define BLOCK_HASH_UPDATE_BASE(block_fn, state, src, nbytes, bs, dv, \
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buf, buflen) \
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({ \
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typeof(block_fn) *_block_fn = &(block_fn); \
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typeof(state + 0) _state = (state); \
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unsigned int _buflen = (buflen); \
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size_t _nbytes = (nbytes); \
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unsigned int _bs = (bs); \
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const u8 *_src = (src); \
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u8 *_buf = (buf); \
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while ((_buflen + _nbytes) >= _bs) { \
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const u8 *data = _src; \
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size_t len = _nbytes; \
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size_t blocks; \
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int remain; \
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if (_buflen) { \
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remain = _bs - _buflen; \
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memcpy(_buf + _buflen, _src, remain); \
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data = _buf; \
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len = _bs; \
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} \
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remain = len % bs; \
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blocks = (len - remain) / (dv); \
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(*_block_fn)(_state, data, blocks); \
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_src += len - remain - _buflen; \
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_nbytes -= len - remain - _buflen; \
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_buflen = 0; \
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} \
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memcpy(_buf + _buflen, _src, _nbytes); \
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_buflen += _nbytes; \
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})
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#define BLOCK_HASH_UPDATE(block, state, src, nbytes, bs, buf, buflen) \
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BLOCK_HASH_UPDATE_BASE(block, state, src, nbytes, bs, 1, buf, buflen)
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#define BLOCK_HASH_UPDATE_BLOCKS(block, state, src, nbytes, bs, buf, buflen) \
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BLOCK_HASH_UPDATE_BASE(block, state, src, nbytes, bs, bs, buf, buflen)
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#endif /* _CRYPTO_INTERNAL_BLOCKHASH_H */
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