Add md5 and hmac from gnulib to libextra/gl/.

15 files changed, 1240 insertions, 0 deletions

diff --git a/configure.in b/configure.in
index f928b6b251..bf898925f5 100644
--- a/configure.in
+++ b/configure.in
@@ -98,6 +98,7 @@ AC_MSG_RESULT([***
 
 gl_EARLY
 lgl_EARLY
+xgl_EARLY
 AC_C_CONST
 AC_C_INLINE
 
@@ -649,6 +650,7 @@ AC_MSG_RESULT([***
 ])
 gl_INIT
 lgl_INIT
+xgl_INIT
 
 AC_MSG_RESULT([***
 *** Detecting options for shared libraries...
diff --git a/libextra/gl/Makefile.am b/libextra/gl/Makefile.am
new file mode 100644
index 0000000000..12f8a4e924
--- /dev/null
+++ b/libextra/gl/Makefile.am
@@ -0,0 +1,72 @@
+## DO NOT EDIT! GENERATED AUTOMATICALLY!
+## Process this file with automake to produce Makefile.in.
+# Copyright (C) 2002-2008 Free Software Foundation, Inc.
+#
+# This file is free software, distributed under the terms of the GNU
+# General Public License.  As a special exception to the GNU General
+# Public License, this file may be distributed as part of a program
+# that contains a configuration script generated by Autoconf, under
+# the same distribution terms as the rest of that program.
+#
+# Generated by gnulib-tool.
+# Reproduce by: gnulib-tool --import --dir=. --lib=libxgnu --source-base=libextra/gl --m4-base=libextra/gl/m4 --doc-base=doc --aux-dir=build-aux --avoid=dummy --avoid=stdint --libtool --macro-prefix=xgl --no-vc-files crypto/hmac-md5 crypto/md5
+
+AUTOMAKE_OPTIONS = 1.5 gnits
+
+noinst_HEADERS =
+noinst_LIBRARIES =
+noinst_LTLIBRARIES =
+EXTRA_DIST =
+BUILT_SOURCES =
+SUFFIXES =
+MOSTLYCLEANFILES = core *.stackdump
+MOSTLYCLEANDIRS =
+CLEANFILES =
+DISTCLEANFILES =
+MAINTAINERCLEANFILES =
+
+AM_CPPFLAGS =
+
+noinst_LTLIBRARIES += libxgnu.la
+
+libxgnu_la_SOURCES =
+libxgnu_la_LIBADD = $(xgl_LTLIBOBJS)
+libxgnu_la_DEPENDENCIES = $(xgl_LTLIBOBJS)
+EXTRA_libxgnu_la_SOURCES =
+libxgnu_la_LDFLAGS = $(AM_LDFLAGS)
+
+## begin gnulib module crypto/hmac-md5
+
+
+EXTRA_DIST += hmac-md5.c hmac.h
+
+EXTRA_libxgnu_la_SOURCES += hmac-md5.c
+
+## end   gnulib module crypto/hmac-md5
+
+## begin gnulib module crypto/md5
+
+
+EXTRA_DIST += md5.c md5.h
+
+EXTRA_libxgnu_la_SOURCES += md5.c
+
+## end   gnulib module crypto/md5
+
+## begin gnulib module memxor
+
+
+EXTRA_DIST += memxor.c memxor.h
+
+EXTRA_libxgnu_la_SOURCES += memxor.c
+
+## end   gnulib module memxor
+
+
+mostlyclean-local: mostlyclean-generic
+	@for dir in '' $(MOSTLYCLEANDIRS); do \
+	  if test -n "$$dir" && test -d $$dir; then \
+	    echo "rmdir $$dir"; rmdir $$dir; \
+	  fi; \
+	done; \
+	:
diff --git a/libextra/gl/hmac-md5.c b/libextra/gl/hmac-md5.c
new file mode 100644
index 0000000000..a6811c275c
--- /dev/null
+++ b/libextra/gl/hmac-md5.c
@@ -0,0 +1,81 @@
+/* hmac-md5.c -- hashed message authentication codes
+   Copyright (C) 2005, 2006 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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Written by Simon Josefsson.  */
+
+#include <config.h>
+
+#include "hmac.h"
+
+#include "memxor.h"
+#include "md5.h"
+
+#include <string.h>
+
+#define IPAD 0x36
+#define OPAD 0x5c
+
+int
+hmac_md5 (const void *key, size_t keylen,
+	  const void *in, size_t inlen, void *resbuf)
+{
+  struct md5_ctx inner;
+  struct md5_ctx outer;
+  char optkeybuf[16];
+  char block[64];
+  char innerhash[16];
+
+  /* Reduce the key's size, so that it becomes <= 64 bytes large.  */
+
+  if (keylen > 64)
+    {
+      struct md5_ctx keyhash;
+
+      md5_init_ctx (&keyhash);
+      md5_process_bytes (key, keylen, &keyhash);
+      md5_finish_ctx (&keyhash, optkeybuf);
+
+      key = optkeybuf;
+      keylen = 16;
+    }
+
+  /* Compute INNERHASH from KEY and IN.  */
+
+  md5_init_ctx (&inner);
+
+  memset (block, IPAD, sizeof (block));
+  memxor (block, key, keylen);
+
+  md5_process_block (block, 64, &inner);
+  md5_process_bytes (in, inlen, &inner);
+
+  md5_finish_ctx (&inner, innerhash);
+
+  /* Compute result from KEY and INNERHASH.  */
+
+  md5_init_ctx (&outer);
+
+  memset (block, OPAD, sizeof (block));
+  memxor (block, key, keylen);
+
+  md5_process_block (block, 64, &outer);
+  md5_process_bytes (innerhash, 16, &outer);
+
+  md5_finish_ctx (&outer, resbuf);
+
+  return 0;
+}
diff --git a/libextra/gl/hmac.h b/libextra/gl/hmac.h
new file mode 100644
index 0000000000..90dae1c32a
--- /dev/null
+++ b/libextra/gl/hmac.h
@@ -0,0 +1,41 @@
+/* hmac.h -- hashed message authentication codes
+   Copyright (C) 2005 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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Written by Simon Josefsson.  */
+
+#ifndef HMAC_H
+# define HMAC_H 1
+
+#include <stddef.h>
+
+/* Compute Hashed Message Authentication Code with MD5, as described
+   in RFC 2104, over BUFFER data of BUFLEN bytes using the KEY of
+   KEYLEN bytes, writing the output to pre-allocated 16 byte minimum
+   RESBUF buffer.  Return 0 on success.  */
+int
+hmac_md5 (const void *key, size_t keylen,
+	  const void *buffer, size_t buflen, void *resbuf);
+
+/* Compute Hashed Message Authentication Code with SHA-1, over BUFFER
+   data of BUFLEN bytes using the KEY of KEYLEN bytes, writing the
+   output to pre-allocated 20 byte minimum RESBUF buffer.  Return 0 on
+   success.  */
+int
+hmac_sha1 (const void *key, size_t keylen,
+	   const void *in, size_t inlen, void *resbuf);
+
+#endif /* HMAC_H */
diff --git a/libextra/gl/m4/gnulib-cache.m4 b/libextra/gl/m4/gnulib-cache.m4
new file mode 100644
index 0000000000..7b1322911d
--- /dev/null
+++ b/libextra/gl/m4/gnulib-cache.m4
@@ -0,0 +1,37 @@
+# Copyright (C) 2002-2008 Free Software Foundation, Inc.
+#
+# This file is free software, distributed under the terms of the GNU
+# General Public License.  As a special exception to the GNU General
+# Public License, this file may be distributed as part of a program
+# that contains a configuration script generated by Autoconf, under
+# the same distribution terms as the rest of that program.
+#
+# Generated by gnulib-tool.
+#
+# This file represents the specification of how gnulib-tool is used.
+# It acts as a cache: It is written and read by gnulib-tool.
+# In projects using CVS, this file is meant to be stored in CVS,
+# like the configure.ac and various Makefile.am files.
+
+
+# Specification in the form of a command-line invocation:
+#   gnulib-tool --import --dir=. --lib=libxgnu --source-base=libextra/gl --m4-base=libextra/gl/m4 --doc-base=doc --aux-dir=build-aux --avoid=dummy --avoid=stdint --libtool --macro-prefix=xgl --no-vc-files crypto/hmac-md5 crypto/md5
+
+# Specification in the form of a few gnulib-tool.m4 macro invocations:
+gl_LOCAL_DIR([])
+gl_MODULES([
+  crypto/hmac-md5
+  crypto/md5
+])
+gl_AVOID([dummy stdint])
+gl_SOURCE_BASE([libextra/gl])
+gl_M4_BASE([libextra/gl/m4])
+gl_PO_BASE([])
+gl_DOC_BASE([doc])
+gl_TESTS_BASE([tests])
+gl_LIB([libxgnu])
+gl_MAKEFILE_NAME([])
+gl_LIBTOOL
+gl_MACRO_PREFIX([xgl])
+gl_PO_DOMAIN([])
+gl_VC_FILES([false])
diff --git a/libextra/gl/m4/gnulib-common.m4 b/libextra/gl/m4/gnulib-common.m4
new file mode 100644
index 0000000000..34d91c728f
--- /dev/null
+++ b/libextra/gl/m4/gnulib-common.m4
@@ -0,0 +1,91 @@
+# gnulib-common.m4 serial 5
+dnl Copyright (C) 2007-2008 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+# gl_COMMON
+# is expanded unconditionally through gnulib-tool magic.
+AC_DEFUN([gl_COMMON], [
+  dnl Use AC_REQUIRE here, so that the code is expanded once only.
+  AC_REQUIRE([gl_COMMON_BODY])
+])
+AC_DEFUN([gl_COMMON_BODY], [
+  AH_VERBATIM([isoc99_inline],
+[/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
+   the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
+   earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
+   __APPLE__ && __MACH__ test for MacOS X.
+   __APPLE_CC__ tests for the Apple compiler and its version.
+   __STDC_VERSION__ tests for the C99 mode.  */
+#if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
+# define __GNUC_STDC_INLINE__ 1
+#endif])
+])
+
+# gl_MODULE_INDICATOR([modulename])
+# defines a C macro indicating the presence of the given module.
+AC_DEFUN([gl_MODULE_INDICATOR],
+[
+  AC_DEFINE([GNULIB_]translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
+    [Define to 1 when using the gnulib module ]$1[.])
+])
+
+# m4_foreach_w
+# is a backport of autoconf-2.59c's m4_foreach_w.
+# Remove this macro when we can assume autoconf >= 2.60.
+m4_ifndef([m4_foreach_w],
+  [m4_define([m4_foreach_w],
+    [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
+
+# AC_PROG_MKDIR_P
+# is a backport of autoconf-2.60's AC_PROG_MKDIR_P.
+# Remove this macro when we can assume autoconf >= 2.60.
+m4_ifdef([AC_PROG_MKDIR_P], [], [
+  AC_DEFUN([AC_PROG_MKDIR_P],
+    [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
+     MKDIR_P='$(mkdir_p)'
+     AC_SUBST([MKDIR_P])])])
+
+# AC_C_RESTRICT
+# This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
+# so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
+# works.
+# This definition can be removed once autoconf >= 2.62 can be assumed.
+AC_DEFUN([AC_C_RESTRICT],
+[AC_CACHE_CHECK([for C/C++ restrict keyword], ac_cv_c_restrict,
+  [ac_cv_c_restrict=no
+   # The order here caters to the fact that C++ does not require restrict.
+   for ac_kw in __restrict __restrict__ _Restrict restrict; do
+     AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+      [[typedef int * int_ptr;
+	int foo (int_ptr $ac_kw ip) {
+	return ip[0];
+       }]],
+      [[int s[1];
+	int * $ac_kw t = s;
+	t[0] = 0;
+	return foo(t)]])],
+      [ac_cv_c_restrict=$ac_kw])
+     test "$ac_cv_c_restrict" != no && break
+   done
+  ])
+ AH_VERBATIM([restrict],
+[/* Define to the equivalent of the C99 'restrict' keyword, or to
+   nothing if this is not supported.  Do not define if restrict is
+   supported directly.  */
+#undef restrict
+/* Work around a bug in Sun C++: it does not support _Restrict, even
+   though the corresponding Sun C compiler does, which causes
+   "#define restrict _Restrict" in the previous line.  Perhaps some future
+   version of Sun C++ will work with _Restrict; if so, it'll probably
+   define __RESTRICT, just as Sun C does.  */
+#if defined __SUNPRO_CC && !defined __RESTRICT
+# define _Restrict
+#endif])
+ case $ac_cv_c_restrict in
+   restrict) ;;
+   no) AC_DEFINE([restrict], []) ;;
+   *)  AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
+ esac
+])
diff --git a/libextra/gl/m4/gnulib-comp.m4 b/libextra/gl/m4/gnulib-comp.m4
new file mode 100644
index 0000000000..2cff4a82b7
--- /dev/null
+++ b/libextra/gl/m4/gnulib-comp.m4
@@ -0,0 +1,184 @@
+# DO NOT EDIT! GENERATED AUTOMATICALLY!
+# Copyright (C) 2002-2008 Free Software Foundation, Inc.
+#
+# This file is free software, distributed under the terms of the GNU
+# General Public License.  As a special exception to the GNU General
+# Public License, this file may be distributed as part of a program
+# that contains a configuration script generated by Autoconf, under
+# the same distribution terms as the rest of that program.
+#
+# Generated by gnulib-tool.
+#
+# This file represents the compiled summary of the specification in
+# gnulib-cache.m4. It lists the computed macro invocations that need
+# to be invoked from configure.ac.
+# In projects using CVS, this file can be treated like other built files.
+
+
+# This macro should be invoked from ./configure.in, in the section
+# "Checks for programs", right after AC_PROG_CC, and certainly before
+# any checks for libraries, header files, types and library functions.
+AC_DEFUN([xgl_EARLY],
+[
+  m4_pattern_forbid([^gl_[A-Z]])dnl the gnulib macro namespace
+  m4_pattern_allow([^gl_ES$])dnl a valid locale name
+  m4_pattern_allow([^gl_LIBOBJS$])dnl a variable
+  m4_pattern_allow([^gl_LTLIBOBJS$])dnl a variable
+  AC_REQUIRE([AC_PROG_RANLIB])
+])
+
+# This macro should be invoked from ./configure.in, in the section
+# "Check for header files, types and library functions".
+AC_DEFUN([xgl_INIT],
+[
+  AM_CONDITIONAL([GL_COND_LIBTOOL], [true])
+  gl_cond_libtool=true
+  m4_pushdef([AC_LIBOBJ], m4_defn([xgl_LIBOBJ]))
+  m4_pushdef([AC_REPLACE_FUNCS], m4_defn([xgl_REPLACE_FUNCS]))
+  m4_pushdef([AC_LIBSOURCES], m4_defn([xgl_LIBSOURCES]))
+  m4_pushdef([xgl_LIBSOURCES_LIST], [])
+  m4_pushdef([xgl_LIBSOURCES_DIR], [])
+  gl_COMMON
+  gl_source_base='libextra/gl'
+  gl_HMAC_MD5
+  gl_MD5
+  gl_MEMXOR
+  m4_ifval(xgl_LIBSOURCES_LIST, [
+    m4_syscmd([test ! -d ]m4_defn([xgl_LIBSOURCES_DIR])[ ||
+      for gl_file in ]xgl_LIBSOURCES_LIST[ ; do
+        if test ! -r ]m4_defn([xgl_LIBSOURCES_DIR])[/$gl_file ; then
+          echo "missing file ]m4_defn([xgl_LIBSOURCES_DIR])[/$gl_file" >&2
+          exit 1
+        fi
+      done])dnl
+      m4_if(m4_sysval, [0], [],
+        [AC_FATAL([expected source file, required through AC_LIBSOURCES, not found])])
+  ])
+  m4_popdef([xgl_LIBSOURCES_DIR])
+  m4_popdef([xgl_LIBSOURCES_LIST])
+  m4_popdef([AC_LIBSOURCES])
+  m4_popdef([AC_REPLACE_FUNCS])
+  m4_popdef([AC_LIBOBJ])
+  AC_CONFIG_COMMANDS_PRE([
+    xgl_libobjs=
+    xgl_ltlibobjs=
+    if test -n "$xgl_LIBOBJS"; then
+      # Remove the extension.
+      sed_drop_objext='s/\.o$//;s/\.obj$//'
+      for i in `for i in $xgl_LIBOBJS; do echo "$i"; done | sed "$sed_drop_objext" | sort | uniq`; do
+        xgl_libobjs="$xgl_libobjs $i.$ac_objext"
+        xgl_ltlibobjs="$xgl_ltlibobjs $i.lo"
+      done
+    fi
+    AC_SUBST([xgl_LIBOBJS], [$xgl_libobjs])
+    AC_SUBST([xgl_LTLIBOBJS], [$xgl_ltlibobjs])
+  ])
+  gltests_libdeps=
+  gltests_ltlibdeps=
+  m4_pushdef([AC_LIBOBJ], m4_defn([xgltests_LIBOBJ]))
+  m4_pushdef([AC_REPLACE_FUNCS], m4_defn([xgltests_REPLACE_FUNCS]))
+  m4_pushdef([AC_LIBSOURCES], m4_defn([xgltests_LIBSOURCES]))
+  m4_pushdef([xgltests_LIBSOURCES_LIST], [])
+  m4_pushdef([xgltests_LIBSOURCES_DIR], [])
+  gl_COMMON
+  gl_source_base='tests'
+  m4_ifval(xgltests_LIBSOURCES_LIST, [
+    m4_syscmd([test ! -d ]m4_defn([xgltests_LIBSOURCES_DIR])[ ||
+      for gl_file in ]xgltests_LIBSOURCES_LIST[ ; do
+        if test ! -r ]m4_defn([xgltests_LIBSOURCES_DIR])[/$gl_file ; then
+          echo "missing file ]m4_defn([xgltests_LIBSOURCES_DIR])[/$gl_file" >&2
+          exit 1
+        fi
+      done])dnl
+      m4_if(m4_sysval, [0], [],
+        [AC_FATAL([expected source file, required through AC_LIBSOURCES, not found])])
+  ])
+  m4_popdef([xgltests_LIBSOURCES_DIR])
+  m4_popdef([xgltests_LIBSOURCES_LIST])
+  m4_popdef([AC_LIBSOURCES])
+  m4_popdef([AC_REPLACE_FUNCS])
+  m4_popdef([AC_LIBOBJ])
+  AC_CONFIG_COMMANDS_PRE([
+    xgltests_libobjs=
+    xgltests_ltlibobjs=
+    if test -n "$xgltests_LIBOBJS"; then
+      # Remove the extension.
+      sed_drop_objext='s/\.o$//;s/\.obj$//'
+      for i in `for i in $xgltests_LIBOBJS; do echo "$i"; done | sed "$sed_drop_objext" | sort | uniq`; do
+        xgltests_libobjs="$xgltests_libobjs $i.$ac_objext"
+        xgltests_ltlibobjs="$xgltests_ltlibobjs $i.lo"
+      done
+    fi
+    AC_SUBST([xgltests_LIBOBJS], [$xgltests_libobjs])
+    AC_SUBST([xgltests_LTLIBOBJS], [$xgltests_ltlibobjs])
+  ])
+])
+
+# Like AC_LIBOBJ, except that the module name goes
+# into xgl_LIBOBJS instead of into LIBOBJS.
+AC_DEFUN([xgl_LIBOBJ], [
+  AS_LITERAL_IF([$1], [xgl_LIBSOURCES([$1.c])])dnl
+  xgl_LIBOBJS="$xgl_LIBOBJS $1.$ac_objext"
+])
+
+# Like AC_REPLACE_FUNCS, except that the module name goes
+# into xgl_LIBOBJS instead of into LIBOBJS.
+AC_DEFUN([xgl_REPLACE_FUNCS], [
+  m4_foreach_w([gl_NAME], [$1], [AC_LIBSOURCES(gl_NAME[.c])])dnl
+  AC_CHECK_FUNCS([$1], , [xgl_LIBOBJ($ac_func)])
+])
+
+# Like AC_LIBSOURCES, except the directory where the source file is
+# expected is derived from the gnulib-tool parameterization,
+# and alloca is special cased (for the alloca-opt module).
+# We could also entirely rely on EXTRA_lib..._SOURCES.
+AC_DEFUN([xgl_LIBSOURCES], [
+  m4_foreach([_gl_NAME], [$1], [
+    m4_if(_gl_NAME, [alloca.c], [], [
+      m4_define([xgl_LIBSOURCES_DIR], [libextra/gl])
+      m4_append([xgl_LIBSOURCES_LIST], _gl_NAME, [ ])
+    ])
+  ])
+])
+
+# Like AC_LIBOBJ, except that the module name goes
+# into xgltests_LIBOBJS instead of into LIBOBJS.
+AC_DEFUN([xgltests_LIBOBJ], [
+  AS_LITERAL_IF([$1], [xgltests_LIBSOURCES([$1.c])])dnl
+  xgltests_LIBOBJS="$xgltests_LIBOBJS $1.$ac_objext"
+])
+
+# Like AC_REPLACE_FUNCS, except that the module name goes
+# into xgltests_LIBOBJS instead of into LIBOBJS.
+AC_DEFUN([xgltests_REPLACE_FUNCS], [
+  m4_foreach_w([gl_NAME], [$1], [AC_LIBSOURCES(gl_NAME[.c])])dnl
+  AC_CHECK_FUNCS([$1], , [xgltests_LIBOBJ($ac_func)])
+])
+
+# Like AC_LIBSOURCES, except the directory where the source file is
+# expected is derived from the gnulib-tool parameterization,
+# and alloca is special cased (for the alloca-opt module).
+# We could also entirely rely on EXTRA_lib..._SOURCES.
+AC_DEFUN([xgltests_LIBSOURCES], [
+  m4_foreach([_gl_NAME], [$1], [
+    m4_if(_gl_NAME, [alloca.c], [], [
+      m4_define([xgltests_LIBSOURCES_DIR], [tests])
+      m4_append([xgltests_LIBSOURCES_LIST], _gl_NAME, [ ])
+    ])
+  ])
+])
+
+# This macro records the list of files which have been installed by
+# gnulib-tool and may be removed by future gnulib-tool invocations.
+AC_DEFUN([xgl_FILE_LIST], [
+  lib/hmac-md5.c
+  lib/hmac.h
+  lib/md5.c
+  lib/md5.h
+  lib/memxor.c
+  lib/memxor.h
+  m4/gnulib-common.m4
+  m4/hmac-md5.m4
+  m4/md5.m4
+  m4/memxor.m4
+])
diff --git a/libextra/gl/m4/gnulib-tool.m4 b/libextra/gl/m4/gnulib-tool.m4
new file mode 100644
index 0000000000..4438d48869
--- /dev/null
+++ b/libextra/gl/m4/gnulib-tool.m4
@@ -0,0 +1,57 @@
+# gnulib-tool.m4 serial 2
+dnl Copyright (C) 2004-2005 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl The following macros need not be invoked explicitly.
+dnl Invoking them does nothing except to declare default arguments
+dnl for "gnulib-tool --import".
+
+dnl Usage: gl_LOCAL_DIR([DIR])
+AC_DEFUN([gl_LOCAL_DIR], [])
+
+dnl Usage: gl_MODULES([module1 module2 ...])
+AC_DEFUN([gl_MODULES], [])
+
+dnl Usage: gl_AVOID([module1 module2 ...])
+AC_DEFUN([gl_AVOID], [])
+
+dnl Usage: gl_SOURCE_BASE([DIR])
+AC_DEFUN([gl_SOURCE_BASE], [])
+
+dnl Usage: gl_M4_BASE([DIR])
+AC_DEFUN([gl_M4_BASE], [])
+
+dnl Usage: gl_PO_BASE([DIR])
+AC_DEFUN([gl_PO_BASE], [])
+
+dnl Usage: gl_DOC_BASE([DIR])
+AC_DEFUN([gl_DOC_BASE], [])
+
+dnl Usage: gl_TESTS_BASE([DIR])
+AC_DEFUN([gl_TESTS_BASE], [])
+
+dnl Usage: gl_WITH_TESTS
+AC_DEFUN([gl_WITH_TESTS], [])
+
+dnl Usage: gl_LIB([LIBNAME])
+AC_DEFUN([gl_LIB], [])
+
+dnl Usage: gl_LGPL or gl_LGPL([VERSION])
+AC_DEFUN([gl_LGPL], [])
+
+dnl Usage: gl_MAKEFILE_NAME([FILENAME])
+AC_DEFUN([gl_MAKEFILE_NAME], [])
+
+dnl Usage: gl_LIBTOOL
+AC_DEFUN([gl_LIBTOOL], [])
+
+dnl Usage: gl_MACRO_PREFIX([PREFIX])
+AC_DEFUN([gl_MACRO_PREFIX], [])
+
+dnl Usage: gl_PO_DOMAIN([DOMAIN])
+AC_DEFUN([gl_PO_DOMAIN], [])
+
+dnl Usage: gl_VC_FILES([BOOLEAN])
+AC_DEFUN([gl_VC_FILES], [])
diff --git a/libextra/gl/m4/hmac-md5.m4 b/libextra/gl/m4/hmac-md5.m4
new file mode 100644
index 0000000000..729c6bf827
--- /dev/null
+++ b/libextra/gl/m4/hmac-md5.m4
@@ -0,0 +1,10 @@
+# hmac-md5.m4 serial 2
+dnl Copyright (C) 2005, 2006 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_HMAC_MD5],
+[
+  AC_LIBOBJ([hmac-md5])
+])
diff --git a/libextra/gl/m4/md5.m4 b/libextra/gl/m4/md5.m4
new file mode 100644
index 0000000000..e4d00f3fee
--- /dev/null
+++ b/libextra/gl/m4/md5.m4
@@ -0,0 +1,15 @@
+# md5.m4 serial 10
+dnl Copyright (C) 2002, 2003, 2004, 2005, 2006, 2008 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_MD5],
+[
+  AC_LIBOBJ([md5])
+
+  dnl Prerequisites of lib/md5.c.
+  AC_REQUIRE([AC_C_BIGENDIAN])
+  AC_REQUIRE([AC_C_INLINE])
+  :
+])
diff --git a/libextra/gl/m4/memxor.m4 b/libextra/gl/m4/memxor.m4
new file mode 100644
index 0000000000..e14ffbb0f1
--- /dev/null
+++ b/libextra/gl/m4/memxor.m4
@@ -0,0 +1,11 @@
+# memxor.m4 serial 3
+dnl Copyright (C) 2006 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_MEMXOR],
+[
+  AC_LIBOBJ([memxor])
+  AC_REQUIRE([AC_C_RESTRICT])
+])
diff --git a/libextra/gl/md5.c b/libextra/gl/md5.c
new file mode 100644
index 0000000000..2e03bb900a
--- /dev/null
+++ b/libextra/gl/md5.c
@@ -0,0 +1,455 @@
+/* Functions to compute MD5 message digest of files or memory blocks.
+   according to the definition of MD5 in RFC 1321 from April 1992.
+   Copyright (C) 1995,1996,1997,1999,2000,2001,2005,2006,2008
+	Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.  */
+
+#include <config.h>
+
+#include "md5.h"
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+#if USE_UNLOCKED_IO
+# include "unlocked-io.h"
+#endif
+
+#ifdef _LIBC
+# include <endian.h>
+# if __BYTE_ORDER == __BIG_ENDIAN
+#  define WORDS_BIGENDIAN 1
+# endif
+/* We need to keep the namespace clean so define the MD5 function
+   protected using leading __ .  */
+# define md5_init_ctx __md5_init_ctx
+# define md5_process_block __md5_process_block
+# define md5_process_bytes __md5_process_bytes
+# define md5_finish_ctx __md5_finish_ctx
+# define md5_read_ctx __md5_read_ctx
+# define md5_stream __md5_stream
+# define md5_buffer __md5_buffer
+#endif
+
+#ifdef WORDS_BIGENDIAN
+# define SWAP(n)							\
+    (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
+#else
+# define SWAP(n) (n)
+#endif
+
+#define BLOCKSIZE 4096
+#if BLOCKSIZE % 64 != 0
+# error "invalid BLOCKSIZE"
+#endif
+
+/* This array contains the bytes used to pad the buffer to the next
+   64-byte boundary.  (RFC 1321, 3.1: Step 1)  */
+static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ...  */ };
+
+
+/* Initialize structure containing state of computation.
+   (RFC 1321, 3.3: Step 3)  */
+void
+md5_init_ctx (struct md5_ctx *ctx)
+{
+  ctx->A = 0x67452301;
+  ctx->B = 0xefcdab89;
+  ctx->C = 0x98badcfe;
+  ctx->D = 0x10325476;
+
+  ctx->total[0] = ctx->total[1] = 0;
+  ctx->buflen = 0;
+}
+
+/* Copy the 4 byte value from v into the memory location pointed to by *cp,
+   If your architecture allows unaligned access this is equivalent to
+   * (uint32_t *) cp = v  */
+static inline void
+set_uint32 (char *cp, uint32_t v)
+{
+  memcpy (cp, &v, sizeof v);
+}
+
+/* Put result from CTX in first 16 bytes following RESBUF.  The result
+   must be in little endian byte order.  */
+void *
+md5_read_ctx (const struct md5_ctx *ctx, void *resbuf)
+{
+  char *r = resbuf;
+  set_uint32 (r + 0 * sizeof ctx->A, SWAP (ctx->A));
+  set_uint32 (r + 1 * sizeof ctx->B, SWAP (ctx->B));
+  set_uint32 (r + 2 * sizeof ctx->C, SWAP (ctx->C));
+  set_uint32 (r + 3 * sizeof ctx->D, SWAP (ctx->D));
+
+  return resbuf;
+}
+
+/* Process the remaining bytes in the internal buffer and the usual
+   prolog according to the standard and write the result to RESBUF.  */
+void *
+md5_finish_ctx (struct md5_ctx *ctx, void *resbuf)
+{
+  /* Take yet unprocessed bytes into account.  */
+  uint32_t bytes = ctx->buflen;
+  size_t size = (bytes < 56) ? 64 / 4 : 64 * 2 / 4;
+
+  /* Now count remaining bytes.  */
+  ctx->total[0] += bytes;
+  if (ctx->total[0] < bytes)
+    ++ctx->total[1];
+
+  /* Put the 64-bit file length in *bits* at the end of the buffer.  */
+  ctx->buffer[size - 2] = SWAP (ctx->total[0] << 3);
+  ctx->buffer[size - 1] = SWAP ((ctx->total[1] << 3) | (ctx->total[0] >> 29));
+
+  memcpy (&((char *) ctx->buffer)[bytes], fillbuf, (size - 2) * 4 - bytes);
+
+  /* Process last bytes.  */
+  md5_process_block (ctx->buffer, size * 4, ctx);
+
+  return md5_read_ctx (ctx, resbuf);
+}
+
+/* Compute MD5 message digest for bytes read from STREAM.  The
+   resulting message digest number will be written into the 16 bytes
+   beginning at RESBLOCK.  */
+int
+md5_stream (FILE *stream, void *resblock)
+{
+  struct md5_ctx ctx;
+  char buffer[BLOCKSIZE + 72];
+  size_t sum;
+
+  /* Initialize the computation context.  */
+  md5_init_ctx (&ctx);
+
+  /* Iterate over full file contents.  */
+  while (1)
+    {
+      /* We read the file in blocks of BLOCKSIZE bytes.  One call of the
+         computation function processes the whole buffer so that with the
+         next round of the loop another block can be read.  */
+      size_t n;
+      sum = 0;
+
+      /* Read block.  Take care for partial reads.  */
+      while (1)
+	{
+	  n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);
+
+	  sum += n;
+
+	  if (sum == BLOCKSIZE)
+	    break;
+
+	  if (n == 0)
+	    {
+	      /* Check for the error flag IFF N == 0, so that we don't
+	         exit the loop after a partial read due to e.g., EAGAIN
+	         or EWOULDBLOCK.  */
+	      if (ferror (stream))
+		return 1;
+	      goto process_partial_block;
+	    }
+
+	  /* We've read at least one byte, so ignore errors.  But always
+	     check for EOF, since feof may be true even though N > 0.
+	     Otherwise, we could end up calling fread after EOF.  */
+	  if (feof (stream))
+	    goto process_partial_block;
+	}
+
+      /* Process buffer with BLOCKSIZE bytes.  Note that
+         BLOCKSIZE % 64 == 0
+       */
+      md5_process_block (buffer, BLOCKSIZE, &ctx);
+    }
+
+process_partial_block:
+
+  /* Process any remaining bytes.  */
+  if (sum > 0)
+    md5_process_bytes (buffer, sum, &ctx);
+
+  /* Construct result in desired memory.  */
+  md5_finish_ctx (&ctx, resblock);
+  return 0;
+}
+
+/* Compute MD5 message digest for LEN bytes beginning at BUFFER.  The
+   result is always in little endian byte order, so that a byte-wise
+   output yields to the wanted ASCII representation of the message
+   digest.  */
+void *
+md5_buffer (const char *buffer, size_t len, void *resblock)
+{
+  struct md5_ctx ctx;
+
+  /* Initialize the computation context.  */
+  md5_init_ctx (&ctx);
+
+  /* Process whole buffer but last len % 64 bytes.  */
+  md5_process_bytes (buffer, len, &ctx);
+
+  /* Put result in desired memory area.  */
+  return md5_finish_ctx (&ctx, resblock);
+}
+
+
+void
+md5_process_bytes (const void *buffer, size_t len, struct md5_ctx *ctx)
+{
+  /* When we already have some bits in our internal buffer concatenate
+     both inputs first.  */
+  if (ctx->buflen != 0)
+    {
+      size_t left_over = ctx->buflen;
+      size_t add = 128 - left_over > len ? len : 128 - left_over;
+
+      memcpy (&((char *) ctx->buffer)[left_over], buffer, add);
+      ctx->buflen += add;
+
+      if (ctx->buflen > 64)
+	{
+	  md5_process_block (ctx->buffer, ctx->buflen & ~63, ctx);
+
+	  ctx->buflen &= 63;
+	  /* The regions in the following copy operation cannot overlap.  */
+	  memcpy (ctx->buffer,
+		  &((char *) ctx->buffer)[(left_over + add) & ~63],
+		  ctx->buflen);
+	}
+
+      buffer = (const char *) buffer + add;
+      len -= add;
+    }
+
+  /* Process available complete blocks.  */
+  if (len >= 64)
+    {
+#if !_STRING_ARCH_unaligned
+# define alignof(type) offsetof (struct { char c; type x; }, x)
+# define UNALIGNED_P(p) (((size_t) p) % alignof (uint32_t) != 0)
+      if (UNALIGNED_P (buffer))
+	while (len > 64)
+	  {
+	    md5_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
+	    buffer = (const char *) buffer + 64;
+	    len -= 64;
+	  }
+      else
+#endif
+	{
+	  md5_process_block (buffer, len & ~63, ctx);
+	  buffer = (const char *) buffer + (len & ~63);
+	  len &= 63;
+	}
+    }
+
+  /* Move remaining bytes in internal buffer.  */
+  if (len > 0)
+    {
+      size_t left_over = ctx->buflen;
+
+      memcpy (&((char *) ctx->buffer)[left_over], buffer, len);
+      left_over += len;
+      if (left_over >= 64)
+	{
+	  md5_process_block (ctx->buffer, 64, ctx);
+	  left_over -= 64;
+	  memcpy (ctx->buffer, &ctx->buffer[16], left_over);
+	}
+      ctx->buflen = left_over;
+    }
+}
+
+
+/* These are the four functions used in the four steps of the MD5 algorithm
+   and defined in the RFC 1321.  The first function is a little bit optimized
+   (as found in Colin Plumbs public domain implementation).  */
+/* #define FF(b, c, d) ((b & c) | (~b & d)) */
+#define FF(b, c, d) (d ^ (b & (c ^ d)))
+#define FG(b, c, d) FF (d, b, c)
+#define FH(b, c, d) (b ^ c ^ d)
+#define FI(b, c, d) (c ^ (b | ~d))
+
+/* Process LEN bytes of BUFFER, accumulating context into CTX.
+   It is assumed that LEN % 64 == 0.  */
+
+void
+md5_process_block (const void *buffer, size_t len, struct md5_ctx *ctx)
+{
+  uint32_t correct_words[16];
+  const uint32_t *words = buffer;
+  size_t nwords = len / sizeof (uint32_t);
+  const uint32_t *endp = words + nwords;
+  uint32_t A = ctx->A;
+  uint32_t B = ctx->B;
+  uint32_t C = ctx->C;
+  uint32_t D = ctx->D;
+
+  /* First increment the byte count.  RFC 1321 specifies the possible
+     length of the file up to 2^64 bits.  Here we only compute the
+     number of bytes.  Do a double word increment.  */
+  ctx->total[0] += len;
+  if (ctx->total[0] < len)
+    ++ctx->total[1];
+
+  /* Process all bytes in the buffer with 64 bytes in each round of
+     the loop.  */
+  while (words < endp)
+    {
+      uint32_t *cwp = correct_words;
+      uint32_t A_save = A;
+      uint32_t B_save = B;
+      uint32_t C_save = C;
+      uint32_t D_save = D;
+
+      /* First round: using the given function, the context and a constant
+         the next context is computed.  Because the algorithms processing
+         unit is a 32-bit word and it is determined to work on words in
+         little endian byte order we perhaps have to change the byte order
+         before the computation.  To reduce the work for the next steps
+         we store the swapped words in the array CORRECT_WORDS.  */
+
+#define OP(a, b, c, d, s, T)						\
+      do								\
+        {								\
+	  a += FF (b, c, d) + (*cwp++ = SWAP (*words)) + T;		\
+	  ++words;							\
+	  CYCLIC (a, s);						\
+	  a += b;							\
+        }								\
+      while (0)
+
+      /* It is unfortunate that C does not provide an operator for
+         cyclic rotation.  Hope the C compiler is smart enough.  */
+#define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
+
+      /* Before we start, one word to the strange constants.
+         They are defined in RFC 1321 as
+
+         T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64
+
+         Here is an equivalent invocation using Perl:
+
+         perl -e 'foreach(1..64){printf "0x%08x\n", int (4294967296 * abs (sin $_))}'
+       */
+
+      /* Round 1.  */
+      OP (A, B, C, D, 7, 0xd76aa478);
+      OP (D, A, B, C, 12, 0xe8c7b756);
+      OP (C, D, A, B, 17, 0x242070db);
+      OP (B, C, D, A, 22, 0xc1bdceee);
+      OP (A, B, C, D, 7, 0xf57c0faf);
+      OP (D, A, B, C, 12, 0x4787c62a);
+      OP (C, D, A, B, 17, 0xa8304613);
+      OP (B, C, D, A, 22, 0xfd469501);
+      OP (A, B, C, D, 7, 0x698098d8);
+      OP (D, A, B, C, 12, 0x8b44f7af);
+      OP (C, D, A, B, 17, 0xffff5bb1);
+      OP (B, C, D, A, 22, 0x895cd7be);
+      OP (A, B, C, D, 7, 0x6b901122);
+      OP (D, A, B, C, 12, 0xfd987193);
+      OP (C, D, A, B, 17, 0xa679438e);
+      OP (B, C, D, A, 22, 0x49b40821);
+
+      /* For the second to fourth round we have the possibly swapped words
+         in CORRECT_WORDS.  Redefine the macro to take an additional first
+         argument specifying the function to use.  */
+#undef OP
+#define OP(f, a, b, c, d, k, s, T)					\
+      do								\
+	{								\
+	  a += f (b, c, d) + correct_words[k] + T;			\
+	  CYCLIC (a, s);						\
+	  a += b;							\
+	}								\
+      while (0)
+
+      /* Round 2.  */
+      OP (FG, A, B, C, D, 1, 5, 0xf61e2562);
+      OP (FG, D, A, B, C, 6, 9, 0xc040b340);
+      OP (FG, C, D, A, B, 11, 14, 0x265e5a51);
+      OP (FG, B, C, D, A, 0, 20, 0xe9b6c7aa);
+      OP (FG, A, B, C, D, 5, 5, 0xd62f105d);
+      OP (FG, D, A, B, C, 10, 9, 0x02441453);
+      OP (FG, C, D, A, B, 15, 14, 0xd8a1e681);
+      OP (FG, B, C, D, A, 4, 20, 0xe7d3fbc8);
+      OP (FG, A, B, C, D, 9, 5, 0x21e1cde6);
+      OP (FG, D, A, B, C, 14, 9, 0xc33707d6);
+      OP (FG, C, D, A, B, 3, 14, 0xf4d50d87);
+      OP (FG, B, C, D, A, 8, 20, 0x455a14ed);
+      OP (FG, A, B, C, D, 13, 5, 0xa9e3e905);
+      OP (FG, D, A, B, C, 2, 9, 0xfcefa3f8);
+      OP (FG, C, D, A, B, 7, 14, 0x676f02d9);
+      OP (FG, B, C, D, A, 12, 20, 0x8d2a4c8a);
+
+      /* Round 3.  */
+      OP (FH, A, B, C, D, 5, 4, 0xfffa3942);
+      OP (FH, D, A, B, C, 8, 11, 0x8771f681);
+      OP (FH, C, D, A, B, 11, 16, 0x6d9d6122);
+      OP (FH, B, C, D, A, 14, 23, 0xfde5380c);
+      OP (FH, A, B, C, D, 1, 4, 0xa4beea44);
+      OP (FH, D, A, B, C, 4, 11, 0x4bdecfa9);
+      OP (FH, C, D, A, B, 7, 16, 0xf6bb4b60);
+      OP (FH, B, C, D, A, 10, 23, 0xbebfbc70);
+      OP (FH, A, B, C, D, 13, 4, 0x289b7ec6);
+      OP (FH, D, A, B, C, 0, 11, 0xeaa127fa);
+      OP (FH, C, D, A, B, 3, 16, 0xd4ef3085);
+      OP (FH, B, C, D, A, 6, 23, 0x04881d05);
+      OP (FH, A, B, C, D, 9, 4, 0xd9d4d039);
+      OP (FH, D, A, B, C, 12, 11, 0xe6db99e5);
+      OP (FH, C, D, A, B, 15, 16, 0x1fa27cf8);
+      OP (FH, B, C, D, A, 2, 23, 0xc4ac5665);
+
+      /* Round 4.  */
+      OP (FI, A, B, C, D, 0, 6, 0xf4292244);
+      OP (FI, D, A, B, C, 7, 10, 0x432aff97);
+      OP (FI, C, D, A, B, 14, 15, 0xab9423a7);
+      OP (FI, B, C, D, A, 5, 21, 0xfc93a039);
+      OP (FI, A, B, C, D, 12, 6, 0x655b59c3);
+      OP (FI, D, A, B, C, 3, 10, 0x8f0ccc92);
+      OP (FI, C, D, A, B, 10, 15, 0xffeff47d);
+      OP (FI, B, C, D, A, 1, 21, 0x85845dd1);
+      OP (FI, A, B, C, D, 8, 6, 0x6fa87e4f);
+      OP (FI, D, A, B, C, 15, 10, 0xfe2ce6e0);
+      OP (FI, C, D, A, B, 6, 15, 0xa3014314);
+      OP (FI, B, C, D, A, 13, 21, 0x4e0811a1);
+      OP (FI, A, B, C, D, 4, 6, 0xf7537e82);
+      OP (FI, D, A, B, C, 11, 10, 0xbd3af235);
+      OP (FI, C, D, A, B, 2, 15, 0x2ad7d2bb);
+      OP (FI, B, C, D, A, 9, 21, 0xeb86d391);
+
+      /* Add the starting values of the context.  */
+      A += A_save;
+      B += B_save;
+      C += C_save;
+      D += D_save;
+    }
+
+  /* Put checksum in context given as argument.  */
+  ctx->A = A;
+  ctx->B = B;
+  ctx->C = C;
+  ctx->D = D;
+}
diff --git a/libextra/gl/md5.h b/libextra/gl/md5.h
new file mode 100644
index 0000000000..ffee3e8a46
--- /dev/null
+++ b/libextra/gl/md5.h
@@ -0,0 +1,118 @@
+/* Declaration of functions and data types used for MD5 sum computing
+   library functions.
+   Copyright (C) 1995-1997,1999,2000,2001,2004,2005,2006,2008
+      Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#ifndef _MD5_H
+#define _MD5_H 1
+
+#include <stdio.h>
+#include <stdint.h>
+
+#define MD5_DIGEST_SIZE 16
+#define MD5_BLOCK_SIZE 64
+
+#ifndef __GNUC_PREREQ
+# if defined __GNUC__ && defined __GNUC_MINOR__
+#  define __GNUC_PREREQ(maj, min)					\
+  ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+# else
+#  define __GNUC_PREREQ(maj, min) 0
+# endif
+#endif
+
+#ifndef __THROW
+# if defined __cplusplus && __GNUC_PREREQ (2,8)
+#  define __THROW	throw ()
+# else
+#  define __THROW
+# endif
+#endif
+
+#ifndef _LIBC
+# define __md5_buffer md5_buffer
+# define __md5_finish_ctx md5_finish_ctx
+# define __md5_init_ctx md5_init_ctx
+# define __md5_process_block md5_process_block
+# define __md5_process_bytes md5_process_bytes
+# define __md5_read_ctx md5_read_ctx
+# define __md5_stream md5_stream
+#endif
+
+/* Structure to save state of computation between the single steps.  */
+struct md5_ctx
+{
+  uint32_t A;
+  uint32_t B;
+  uint32_t C;
+  uint32_t D;
+
+  uint32_t total[2];
+  uint32_t buflen;
+  uint32_t buffer[32];
+};
+
+/*
+ * The following three functions are build up the low level used in
+ * the functions `md5_stream' and `md5_buffer'.
+ */
+
+/* Initialize structure containing state of computation.
+   (RFC 1321, 3.3: Step 3)  */
+extern void __md5_init_ctx (struct md5_ctx *ctx) __THROW;
+
+/* Starting with the result of former calls of this function (or the
+   initialization function update the context for the next LEN bytes
+   starting at BUFFER.
+   It is necessary that LEN is a multiple of 64!!! */
+extern void __md5_process_block (const void *buffer, size_t len,
+				 struct md5_ctx *ctx) __THROW;
+
+/* Starting with the result of former calls of this function (or the
+   initialization function update the context for the next LEN bytes
+   starting at BUFFER.
+   It is NOT required that LEN is a multiple of 64.  */
+extern void __md5_process_bytes (const void *buffer, size_t len,
+				 struct md5_ctx *ctx) __THROW;
+
+/* Process the remaining bytes in the buffer and put result from CTX
+   in first 16 bytes following RESBUF.  The result is always in little
+   endian byte order, so that a byte-wise output yields to the wanted
+   ASCII representation of the message digest.  */
+extern void *__md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) __THROW;
+
+
+/* Put result from CTX in first 16 bytes following RESBUF.  The result is
+   always in little endian byte order, so that a byte-wise output yields
+   to the wanted ASCII representation of the message digest.  */
+extern void *__md5_read_ctx (const struct md5_ctx *ctx, void *resbuf) __THROW;
+
+
+/* Compute MD5 message digest for bytes read from STREAM.  The
+   resulting message digest number will be written into the 16 bytes
+   beginning at RESBLOCK.  */
+extern int __md5_stream (FILE *stream, void *resblock) __THROW;
+
+/* Compute MD5 message digest for LEN bytes beginning at BUFFER.  The
+   result is always in little endian byte order, so that a byte-wise
+   output yields to the wanted ASCII representation of the message
+   digest.  */
+extern void *__md5_buffer (const char *buffer, size_t len,
+			   void *resblock) __THROW;
+
+#endif /* md5.h */
diff --git a/libextra/gl/memxor.c b/libextra/gl/memxor.c
new file mode 100644
index 0000000000..2d8a2a27a7
--- /dev/null
+++ b/libextra/gl/memxor.c
@@ -0,0 +1,35 @@
+/* memxor.c -- perform binary exclusive OR operation of two memory blocks.
+   Copyright (C) 2005, 2006 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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Written by Simon Josefsson.  The interface was inspired by memxor
+   in Niels Möller's Nettle. */
+
+#include <config.h>
+
+#include "memxor.h"
+
+void *
+memxor (void *restrict dest, const void *restrict src, size_t n)
+{
+  char const *s = src;
+  char *d = dest;
+
+  for (; n > 0; n--)
+    *d++ ^= *s++;
+
+  return dest;
+}
diff --git a/libextra/gl/memxor.h b/libextra/gl/memxor.h
new file mode 100644
index 0000000000..70e914669e
--- /dev/null
+++ b/libextra/gl/memxor.h
@@ -0,0 +1,31 @@
+/* memxor.h -- perform binary exclusive OR operation on memory blocks.
+   Copyright (C) 2005 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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Written by Simon Josefsson.  The interface was inspired by memxor
+   in Niels Möller's Nettle. */
+
+#ifndef MEMXOR_H
+# define MEMXOR_H
+
+#include <stddef.h>
+
+/* Compute binary exclusive OR of memory areas DEST and SRC, putting
+   the result in DEST, of length N bytes.  Returns a pointer to
+   DEST. */
+void *memxor (void *restrict dest, const void *restrict src, size_t n);
+
+#endif /* MEMXOR_H */