1 files changed, 60 insertions, 0 deletions
diff --git a/SoftHSMv2/m4/acx_openssl.m4 b/SoftHSMv2/m4/acx_openssl.m4
new file mode 100644
index 0000000..e90c78f
--- /dev/null
+++ b/SoftHSMv2/m4/acx_openssl.m4
@@ -0,0 +1,60 @@
+AC_DEFUN([ACX_OPENSSL],[
+	AC_ARG_WITH(openssl,
+        	AC_HELP_STRING([--with-openssl=PATH],[Specify prefix of path of OpenSSL]),
+		[
+			OPENSSL_PATH="$withval"
+		],
+		[
+			OPENSSL_PATH="/usr/local"
+		])
+
+	AC_MSG_CHECKING(what are the OpenSSL includes)
+	OPENSSL_INCLUDES="-I$OPENSSL_PATH/include"
+	AC_MSG_RESULT($OPENSSL_INCLUDES)
+
+	AC_MSG_CHECKING(what are the OpenSSL libs)
+	OPENSSL_LIBS="-L$OPENSSL_PATH/lib -lcrypto"
+	AC_MSG_RESULT($OPENSSL_LIBS)
+
+	tmp_CPPFLAGS=$CPPFLAGS
+	tmp_LIBS=$LIBS
+
+	CPPFLAGS="$CPPFLAGS $OPENSSL_INCLUDES"
+	LIBS="$OPENSSL_LIBS $LIBS"
+
+	AC_CHECK_HEADERS([openssl/ssl.h],,[AC_MSG_ERROR([Can't find OpenSSL headers])])
+	AC_CHECK_LIB(crypto, BN_new,,[AC_MSG_ERROR([Can't find OpenSSL library])])
+
+	AC_MSG_CHECKING([for OpenSSL version])
+	CHECK_OPENSSL_VERSION=m4_format(0x%02x%02x%02x000L, $1, $2, $3)
+	AC_LANG_PUSH([C])
+	AC_RUN_IFELSE([
+		AC_LANG_SOURCE([[
+			#include <openssl/ssl.h>
+			#include <openssl/opensslv.h>
+			int main()
+			{
+			#ifndef OPENSSL_VERSION_NUMBER
+				return -1;
+			#endif
+			#if OPENSSL_VERSION_NUMBER >= $CHECK_OPENSSL_VERSION
+				return 0;
+			#else
+				return 1;
+			#endif
+			}
+		]])
+	],[
+		AC_MSG_RESULT([>= $1.$2.$3])
+	],[
+		AC_MSG_RESULT([< $1.$2.$3])
+		AC_MSG_ERROR([OpenSSL library too old ($1.$2.$3 or later required)])
+	],[])
+	AC_LANG_POP([C])
+
+	CPPFLAGS=$tmp_CPPFLAGS
+	LIBS=$tmp_LIBS
+
+	AC_SUBST(OPENSSL_INCLUDES)
+	AC_SUBST(OPENSSL_LIBS)
+])