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Diffstat (limited to 'sntp/m4/ntp_crypto_rand.m4')
| -rw-r--r-- | sntp/m4/ntp_crypto_rand.m4 | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/sntp/m4/ntp_crypto_rand.m4 b/sntp/m4/ntp_crypto_rand.m4 new file mode 100644 index 0000000..c529f3a --- /dev/null +++ b/sntp/m4/ntp_crypto_rand.m4 @@ -0,0 +1,53 @@ +# 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 + |