diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2025-04-28 12:56:05 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2025-05-05 13:32:01 +0800 |
| commit | 74a43a2cf5e8a3eeab3b55a2e64b33281f5ac554 (patch) | |
| tree | f547dd09feed355e483558b6f8e8c4c01e3d9266 /include/crypto/internal | |
| parent | fba4aafaba8a6ca2bb42e854c37ff9a685ddfd71 (diff) | |
crypto: lib/sha256 - Move partial block handling out
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>
Diffstat (limited to 'include/crypto/internal')
| -rw-r--r-- | include/crypto/internal/blockhash.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/include/crypto/internal/blockhash.h b/include/crypto/internal/blockhash.h new file mode 100644 index 000000000000..52d9d4c82493 --- /dev/null +++ b/include/crypto/internal/blockhash.h @@ -0,0 +1,52 @@ +/* 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 */ |