Coverage Report

Created: 2025-03-06 06:58

/src/wget/lib/af_alg.h
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/* af_alg.h - Compute message digests from file streams and buffers.
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   Copyright (C) 2018-2025 Free Software Foundation, Inc.
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   This file is free software: you can redistribute it and/or modify
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   it under the terms of the GNU Lesser General Public License as
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   published by the Free Software Foundation; either version 2.1 of the
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   License, or (at your option) any later version.
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   This file is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public License
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   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
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/* Written by Matteo Croce <mcroce@redhat.com>, 2018.
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   Documentation by Bruno Haible <bruno@clisp.org>, 2018.  */
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/* Declare specific functions for computing message digests
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   using the Linux kernel crypto API, if available.  This kernel API gives
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   access to specialized crypto instructions (that would also be available
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   in user space) or to crypto devices (not directly available in user space).
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   For a more complete set of facilities that use the Linux kernel crypto API,
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   look at libkcapi.  */
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#ifndef AF_ALG_H
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# define AF_ALG_H 1
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# include <stdio.h>
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# include <errno.h>
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# ifdef __cplusplus
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extern "C" {
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# endif
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# if USE_LINUX_CRYPTO_API
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/* Compute a message digest of a memory region.
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   The memory region starts at BUFFER and is LEN bytes long.
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   ALG is the message digest algorithm; see the file /proc/crypto.
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   RESBLOCK points to a block of HASHLEN bytes, for the result.
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   HASHLEN must be the length of the message digest, in bytes, in particular:
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      alg    | hashlen
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      -------+--------
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      md5    | 16
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      sha1   | 20
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      sha224 | 28
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      sha256 | 32
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      sha384 | 48
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      sha512 | 64
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   If successful, fill RESBLOCK and return 0.
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   Upon failure, return a negated error number.  */
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int
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afalg_buffer (const char *buffer, size_t len, const char *alg,
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              void *resblock, ssize_t hashlen);
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/* Compute a message digest of data read from STREAM.
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   STREAM is an open file stream.  The last operation on STREAM should
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   not be 'ungetc', and if STREAM is also open for writing it should
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   have been fflushed since its last write.  Read from the current
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   position to the end of STREAM.  Handle regular files efficiently.
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   ALG is the message digest algorithm; see the file /proc/crypto.
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   RESBLOCK points to a block of HASHLEN bytes, for the result.
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   HASHLEN must be the length of the message digest, in bytes, in particular:
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      alg    | hashlen
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      -------+--------
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      md5    | 16
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      sha1   | 20
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      sha224 | 28
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      sha256 | 32
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      sha384 | 48
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      sha512 | 64
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   If successful, fill RESBLOCK and return 0.
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   Upon failure, return a negated error number.
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   Unless returning 0 or -EIO, restore STREAM's file position so that
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   the caller can fall back on some other method.  */
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int
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afalg_stream (FILE *stream, const char *alg,
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              void *resblock, ssize_t hashlen);
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# else
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static inline int
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afalg_buffer (const char *buffer, size_t len, const char *alg,
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              void *resblock, ssize_t hashlen)
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0
{
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  return -EAFNOSUPPORT;
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0
}
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static inline int
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afalg_stream (FILE *stream, const char *alg,
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              void *resblock, ssize_t hashlen)
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0
{
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  return -EAFNOSUPPORT;
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0
}
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# endif
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# ifdef __cplusplus
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}
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# endif
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#endif /* AF_ALG_H */