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116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/* af_alg.h - Compute message digests from file streams and buffers.
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Copyright (C) 2018-2020 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This program 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 General Public License for more details.
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You should have received a copy of the GNU 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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{
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return -EAFNOSUPPORT;
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}
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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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{
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return -EAFNOSUPPORT;
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}
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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 */
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