diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Makefile.in | 6 | ||||
| -rw-r--r-- | lib/af_alg.h | 115 |
2 files changed, 121 insertions, 0 deletions
diff --git a/lib/Makefile.in b/lib/Makefile.in index e6b1ae6a9ab..d8dc5488f07 100644 --- a/lib/Makefile.in +++ b/lib/Makefile.in @@ -50,12 +50,18 @@ am__v_at_ = $(am__v_at_@AM_DEFAULT_V@) am__v_at_0 = @ am__v_at_1 = +HAVE_NATIVE_COMP = @HAVE_NATIVE_COMP@ + ALL_CFLAGS= \ $(C_SWITCH_SYSTEM) $(C_SWITCH_MACHINE) $(DEPFLAGS) \ $(GNULIB_WARN_CFLAGS) $(WERROR_CFLAGS) $(PROFILING_CFLAGS) $(CFLAGS) \ -I. -I../src -I$(srcdir) -I$(srcdir)/../src \ $(if $(patsubst e-%,,$(notdir $<)),,-Demacs) +ifeq ($(HAVE_NATIVE_COMP),yes) +ALL_CFLAGS += -DGL_COMPILE_CRYPTO_STREAM +endif + SYSTEM_TYPE = @SYSTEM_TYPE@ ifeq ($(SYSTEM_TYPE),windows-nt) include $(srcdir)/../nt/gnulib-cfg.mk diff --git a/lib/af_alg.h b/lib/af_alg.h new file mode 100644 index 00000000000..4c5854cc99b --- /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 2, 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 <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 */ |