1# SYNOPSIS -*- Autoconf -*- 2# 3# NTP_CRYPTO_RAND 4# 5# DESCRIPTION 6# 7# AUTHOR 8# 9# Harlan Stenn 10# 11# LICENSE 12# 13# This file is Copyright (c) 2014 Network Time Foundation 14# 15# Copying and distribution of this file, with or without modification, are 16# permitted in any medium without royalty provided the copyright notice, 17# author attribution and this notice are preserved. This file is offered 18# as-is, without any warranty. 19 20AC_DEFUN([NTP_CRYPTO_RAND], [ 21 22dnl check for --disable-openssl-random 23dnl if that's not specified: 24dnl - Look for RAND_poll and RAND_bytes 25dnl - if they exist, define USE_OPENSSL_CRYPTO_RAND 26 27AC_MSG_CHECKING([if we want to use OpenSSL's crypto random (if available)]) 28AC_ARG_ENABLE( 29 [openssl-random], 30 [AS_HELP_STRING( 31 [--enable-openssl-random], 32 [Use OpenSSL's crypto random number functions, if available (default is yes)] 33 )], 34 [ntp_use_openssl_random=$enableval], 35 [ntp_use_openssl_random=yes] 36) 37AC_MSG_RESULT([$ntp_use_openssl_random]) 38 39# The following might need extra libraries 40NTPO_SAVED_LIBS="$LIBS" 41LIBS="$NTPO_SAVED_LIBS $LDADD_NTP" 42dnl AC_MSG_NOTICE([LIBS is <$LIBS>]) 43AC_CHECK_FUNCS([RAND_bytes RAND_poll]) 44LIBS="$NTPO_SAVED_LIBS" 45case "$ntp_use_openssl_random$ac_cv_func_RAND_bytes$ac_cv_func_RAND_poll" in 46 yesyesyes) 47 AC_DEFINE([USE_OPENSSL_CRYPTO_RAND], [1], [Use OpenSSL's crypto random functions]) 48 ;; 49 *) ntp_use_openssl_random=no ;; 50esac 51 52]) dnl NTP_CRYPTO_RAND 53 54