# gl-openssl.m4 serial 3

dnl Copyright (C) 2013-2018 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_SET_CRYPTO_CHECK_DEFAULT],

[

  m4_define([gl_CRYPTO_CHECK_DEFAULT], [$1])

])

gl_SET_CRYPTO_CHECK_DEFAULT([no])

AC_DEFUN([gl_CRYPTO_CHECK],

[

  dnl gnulib users set this before gl_INIT with gl_SET_CRYPTO_CHECK_DEFAULT()

  m4_divert_once([DEFAULTS], [with_openssl_default='gl_CRYPTO_CHECK_DEFAULT'])

  dnl Only clear once, so crypto routines can be checked for individually

  m4_divert_once([DEFAULTS], [LIB_CRYPTO=])

  AC_ARG_WITH([openssl],

    [AS_HELP_STRING([--with-openssl],

      [use libcrypto hash routines. Valid ARGs are:

       'yes', 'no', 'auto' => use if available,

       'optional' => use if available and warn if not available;

       default is ']gl_CRYPTO_CHECK_DEFAULT['.

       Note also --with-linux-crypto, which will enable

       use of kernel crypto routines, which have precedence])],

    [],

    [with_openssl=$with_openssl_default])

  if test "x$1" = xMD5; then

    ALG_header=md5.h

  else

    ALG_header=sha.h

  fi

  AC_SUBST([LIB_CRYPTO])

  if test "x$with_openssl" != xno; then

    AC_CHECK_LIB([crypto], [$1],

      [AC_CHECK_HEADERS([openssl/$ALG_header],

         [LIB_CRYPTO=-lcrypto

          AC_DEFINE([HAVE_OPENSSL_$1], [1],

            [Define to 1 if libcrypto is used for $1.])])])

    if test "x$LIB_CRYPTO" = x; then

      if test "x$with_openssl" = xyes; then

        AC_MSG_ERROR([openssl development library not found for $1])

      elif test "x$with_openssl" = xoptional; then

        AC_MSG_WARN([openssl development library not found for $1])

      fi

    fi

  fi

])