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# SYNOPSIS -*- Autoconf -*-
#
# NTP_CRYPTO_RAND
#
# DESCRIPTION
#
# AUTHOR
#
# Harlan Stenn
#
# LICENSE
#
# This file is Copyright (c) 2014 Network Time Foundation
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice,
# author attribution and this notice are preserved. This file is offered
# as-is, without any warranty.
AC_DEFUN([NTP_CRYPTO_RAND], [
dnl check for --disable-openssl-random
dnl if that's not specified:
dnl - Look for RAND_poll and RAND_bytes
dnl - if they exist, define USE_OPENSSL_CRYPTO_RAND
AC_MSG_CHECKING([if we want to use OpenSSL's crypto random (if available)])
AC_ARG_ENABLE(
[openssl-random],
[AS_HELP_STRING(
[--enable-openssl-random],
[Use OpenSSL's crypto random number functions, if available (default is yes)]
)],
[ntp_use_openssl_random=$enableval],
[ntp_use_openssl_random=yes]
)
AC_MSG_RESULT([$ntp_use_openssl_random])
# The following might need extra libraries
NTPO_SAVED_LIBS="$LIBS"
LIBS="$NTPO_SAVED_LIBS $LDADD_NTP"
dnl AC_MSG_NOTICE([LIBS is <$LIBS>])
AC_CHECK_FUNCS([RAND_bytes RAND_poll])
LIBS="$NTPO_SAVED_LIBS"
case "$ntp_use_openssl_random$ac_cv_func_RAND_bytes$ac_cv_func_RAND_poll" in
yesyesyes)
AC_DEFINE([USE_OPENSSL_CRYPTO_RAND], [1], [Use OpenSSL's crypto random functions])
;;
*) ntp_use_openssl_random=no ;;
esac
]) dnl NTP_CRYPTO_RAND
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