File: libcaes.m4

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libfvde 20160918-1
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dnl Functions for libcaes
dnl
dnl Version: 20160911

dnl Function to detect if libcaes is available
dnl ac_libcaes_dummy is used to prevent AC_CHECK_LIB adding unnecessary -l<library> arguments
AC_DEFUN([AX_LIBCAES_CHECK_LIB],
 [dnl Check if parameters were provided
 AS_IF(
  [test "x$ac_cv_with_libcaes" != x && test "x$ac_cv_with_libcaes" != xno && test "x$ac_cv_with_libcaes" != xauto-detect],
  [AS_IF(
   [test -d "$ac_cv_with_libcaes"],
   [CFLAGS="$CFLAGS -I${ac_cv_with_libcaes}/include"
   LDFLAGS="$LDFLAGS -L${ac_cv_with_libcaes}/lib"],
   [AC_MSG_WARN([no such directory: $ac_cv_with_libcaes])
   ])
  ])

 AS_IF(
  [test "x$ac_cv_with_libcaes" = xno],
  [ac_cv_libcaes=no],
  [dnl Check for a pkg-config file
  AS_IF(
   [test "x$cross_compiling" != "xyes" && test "x$PKGCONFIG" != "x"],
   [PKG_CHECK_MODULES(
    [libcaes],
    [libcaes >= 20130716],
    [ac_cv_libcaes=yes],
    [ac_cv_libcaes=no])
   ])

  AS_IF(
   [test "x$ac_cv_libcaes" = xyes],
   [ac_cv_libcaes_CPPFLAGS="$pkg_cv_libcaes_CFLAGS"
   ac_cv_libcaes_LIBADD="$pkg_cv_libcaes_LIBS"],
   [dnl Check for headers
   AC_CHECK_HEADERS([libcaes.h])

   AS_IF(
    [test "x$ac_cv_header_libcaes_h" = xno],
    [ac_cv_libcaes=no],
    [dnl Check for the individual functions
    ac_cv_libcaes=yes

    AC_CHECK_LIB(
     caes,
     libcaes_get_version,
     [ac_cv_libcaes_dummy=yes],
     [ac_cv_libcaes=no])

    dnl Context functions
    AC_CHECK_LIB(
     caes,
     libcaes_context_initialize,
     [ac_cv_libcaes_dummy=yes],
     [ac_cv_libcaes=no])
    AC_CHECK_LIB(
     caes,
     libcaes_context_free,
     [ac_cv_libcaes_dummy=yes],
     [ac_cv_libcaes=no])
    AC_CHECK_LIB(
     caes,
     libcaes_context_set_key,
     [ac_cv_libcaes_dummy=yes],
     [ac_cv_libcaes=no])

    dnl Tweaked context functions
    AC_CHECK_LIB(
     caes,
     libcaes_tweaked_context_initialize,
     [ac_cv_libcaes_dummy=yes],
     [ac_cv_libcaes=no])
    AC_CHECK_LIB(
     caes,
     libcaes_tweaked_context_free,
     [ac_cv_libcaes_dummy=yes],
     [ac_cv_libcaes=no])
    AC_CHECK_LIB(
     caes,
     libcaes_tweaked_context_set_keys,
     [ac_cv_libcaes_dummy=yes],
     [ac_cv_libcaes=no])

    dnl Crypt functions
    AC_CHECK_LIB(
     caes,
     libcaes_crypt_cbc,
     [ac_cv_libcaes_dummy=yes],
     [ac_cv_libcaes=no])
    AC_CHECK_LIB(
     caes,
     libcaes_crypt_ccm,
     [ac_cv_libcaes_dummy=yes],
     [ac_cv_libcaes=no])
    AC_CHECK_LIB(
     caes,
     libcaes_crypt_ecb,
     [ac_cv_libcaes_dummy=yes],
     [ac_cv_libcaes=no])
    AC_CHECK_LIB(
     caes,
     libcaes_crypt_xts,
     [ac_cv_libcaes_dummy=yes],
     [ac_cv_libcaes=no])

    ac_cv_libcaes_LIBADD="-lcaes"
    ])
   ])
  ])

 AS_IF(
  [test "x$ac_cv_libcaes" = xyes],
  [AC_DEFINE(
   [HAVE_LIBCAES],
   [1],
   [Define to 1 if you have the `caes' library (-lcaes).])
  ])

 AS_IF(
  [test "x$ac_cv_libcaes" = xyes],
  [ac_cv_libcaes_aes=libcaes],
  [ac_cv_libcaes_aes=no])

 AS_IF(
  [test "x$ac_cv_libcaes" = xyes],
  [AC_SUBST(
   [HAVE_LIBCAES],
   [1]) ],
  [AC_SUBST(
   [HAVE_LIBCAES],
   [0])
  ])
 ])

dnl Function to detect if libcaes dependencies are available
AC_DEFUN([AX_LIBCAES_CHECK_LOCAL],
 [ac_cv_libcaes_aes=no

 dnl Check for Windows crypto API support
 AS_IF(
  [test "x$ac_cv_enable_winapi" = xyes],
  [ac_cv_libcaes_aes=libadvapi32])

 dnl Check for libcrypto (openssl) support
 AS_IF(
  [test "x$ac_cv_libcaes_aes" = xno],
  [AX_LIBCRYPTO_CHECK_ENABLE

  AS_IF(
   [test "x$ac_cv_libcrypto" != xno],
   [AX_LIBCRYPTO_CHECK_AES

   ac_cv_libcaes_aes=$ac_cv_libcrypto_aes])
  ])

 dnl Fallback to local versions if necessary
 AS_IF(
  [test "x$ac_cv_libcaes_aes" = xno],
  [ac_cv_libcaes_aes=local])
 ])

dnl Function to detect how to enable libcaes
AC_DEFUN([AX_LIBCAES_CHECK_ENABLE],
 [AX_COMMON_ARG_WITH(
  [libcaes],
  [libcaes],
  [search for libcaes in includedir and libdir or in the specified DIR, or no if to use local version],
  [auto-detect],
  [DIR])

 dnl Check for Windows crypto API support
 AX_WINCRYPT_CHECK_LIB

 dnl Check for a shared library version
 AX_LIBCAES_CHECK_LIB

 dnl Check if the dependencies for the local library version
 AS_IF(
  [test "x$ac_cv_libcaes" != xyes],
  [AX_LIBCAES_CHECK_LOCAL

  AC_DEFINE(
   [HAVE_LOCAL_LIBCAES],
   [1],
   [Define to 1 if the local version of libcaes is used.])
  AC_SUBST(
   [HAVE_LOCAL_LIBCAES],
   [1])

  ac_cv_libcaes_CPPFLAGS="-I../libcaes";
  ac_cv_libcaes_LIBADD="../libcaes/libcaes.la";

  ac_cv_libcaes=local
  ])

 AM_CONDITIONAL(
  [HAVE_LOCAL_LIBCAES],
  [test "x$ac_cv_libcaes" = xlocal])
 AS_IF(
  [test "x$ac_cv_libcaes_CPPFLAGS" != "x"],
  [AC_SUBST(
   [LIBCAES_CPPFLAGS],
   [$ac_cv_libcaes_CPPFLAGS])
  ])
 AS_IF(
  [test "x$ac_cv_libcaes_LIBADD" != "x"],
  [AC_SUBST(
   [LIBCAES_LIBADD],
   [$ac_cv_libcaes_LIBADD])
  ])

 AS_IF(
  [test "x$ac_cv_libcaes" = xyes],
  [AC_SUBST(
   [ax_libcaes_pc_libs_private],
   [-lcaes])
  ])

 AS_IF(
  [test "x$ac_cv_libcaes" = xyes],
  [AC_SUBST(
   [ax_libcaes_spec_requires],
   [libcaes])
  AC_SUBST(
   [ax_libcaes_spec_build_requires],
   [libcaes-devel])
  ])
 ])