From bbe35a6e1b54ef5cd7c1c471886c30ba85c0804e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 19:47:50 +0200 Subject: Adding upstream version 1.21. Signed-off-by: Daniel Baumann --- lib/af_alg.h | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) create mode 100644 lib/af_alg.h (limited to 'lib/af_alg.h') diff --git a/lib/af_alg.h b/lib/af_alg.h new file mode 100644 index 0000000..fcfb12f --- /dev/null +++ b/lib/af_alg.h @@ -0,0 +1,115 @@ +/* af_alg.h - Compute message digests from file streams and buffers. + Copyright (C) 2018-2020 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation; either version 3, or (at your option) any + later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, see . */ + +/* Written by Matteo Croce , 2018. + Documentation by Bruno Haible , 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 +# include + +# 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 */ -- cgit v1.2.3