mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-25 07:28:20 +00:00
116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/* af_alg.h - Compute message digests from file streams and buffers.
|
|
Copyright (C) 2018-2024 Free Software Foundation, Inc.
|
|
|
|
This file is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as
|
|
published by the Free Software Foundation; either version 2.1 of the
|
|
License, or (at your option) any later version.
|
|
|
|
This file is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
/* Written by Matteo Croce <mcroce@redhat.com>, 2018.
|
|
Documentation by Bruno Haible <bruno@clisp.org>, 2018. */
|
|
|
|
/* Declare specific functions for computing message digests
|
|
using the Linux kernel crypto API, if available. This kernel API gives
|
|
access to specialized crypto instructions (that would also be available
|
|
in user space) or to crypto devices (not directly available in user space).
|
|
|
|
For a more complete set of facilities that use the Linux kernel crypto API,
|
|
look at libkcapi. */
|
|
|
|
#ifndef AF_ALG_H
|
|
# define AF_ALG_H 1
|
|
|
|
# include <stdio.h>
|
|
# include <errno.h>
|
|
|
|
# ifdef __cplusplus
|
|
extern "C" {
|
|
# endif
|
|
|
|
# if USE_LINUX_CRYPTO_API
|
|
|
|
/* Compute a message digest of a memory region.
|
|
|
|
The memory region starts at BUFFER and is LEN bytes long.
|
|
|
|
ALG is the message digest algorithm; see the file /proc/crypto.
|
|
|
|
RESBLOCK points to a block of HASHLEN bytes, for the result.
|
|
HASHLEN must be the length of the message digest, in bytes, in particular:
|
|
|
|
alg | hashlen
|
|
-------+--------
|
|
md5 | 16
|
|
sha1 | 20
|
|
sha224 | 28
|
|
sha256 | 32
|
|
sha384 | 48
|
|
sha512 | 64
|
|
|
|
If successful, fill RESBLOCK and return 0.
|
|
Upon failure, return a negated error number. */
|
|
int
|
|
afalg_buffer (const char *buffer, size_t len, const char *alg,
|
|
void *resblock, ssize_t hashlen);
|
|
|
|
/* Compute a message digest of data read from STREAM.
|
|
|
|
STREAM is an open file stream. The last operation on STREAM should
|
|
not be 'ungetc', and if STREAM is also open for writing it should
|
|
have been fflushed since its last write. Read from the current
|
|
position to the end of STREAM. Handle regular files efficiently.
|
|
|
|
ALG is the message digest algorithm; see the file /proc/crypto.
|
|
|
|
RESBLOCK points to a block of HASHLEN bytes, for the result.
|
|
HASHLEN must be the length of the message digest, in bytes, in particular:
|
|
|
|
alg | hashlen
|
|
-------+--------
|
|
md5 | 16
|
|
sha1 | 20
|
|
sha224 | 28
|
|
sha256 | 32
|
|
sha384 | 48
|
|
sha512 | 64
|
|
|
|
If successful, fill RESBLOCK and return 0.
|
|
Upon failure, return a negated error number.
|
|
Unless returning 0 or -EIO, restore STREAM's file position so that
|
|
the caller can fall back on some other method. */
|
|
int
|
|
afalg_stream (FILE *stream, const char *alg,
|
|
void *resblock, ssize_t hashlen);
|
|
|
|
# else
|
|
|
|
static inline int
|
|
afalg_buffer (const char *buffer, size_t len, const char *alg,
|
|
void *resblock, ssize_t hashlen)
|
|
{
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
|
|
static inline int
|
|
afalg_stream (FILE *stream, const char *alg,
|
|
void *resblock, ssize_t hashlen)
|
|
{
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
|
|
# endif
|
|
|
|
# ifdef __cplusplus
|
|
}
|
|
# endif
|
|
|
|
#endif /* AF_ALG_H */
|