From 8883fd1c0efa08fe0a73a11a1c8986fa3ea72753 Mon Sep 17 00:00:00 2001
From: Thomas Lenz <thomas.lenz@egiz.gv.at>
Date: Fri, 13 Sep 2019 09:02:58 +0200
Subject: refactor utils into a separate module

---
 .../idp/process/support/SecureRandomHolder.java    | 61 ++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 eaaf_core_utils/src/main/java/at/gv/egiz/eaaf/core/impl/idp/process/support/SecureRandomHolder.java

(limited to 'eaaf_core_utils/src/main/java/at/gv/egiz/eaaf/core/impl/idp/process')

diff --git a/eaaf_core_utils/src/main/java/at/gv/egiz/eaaf/core/impl/idp/process/support/SecureRandomHolder.java b/eaaf_core_utils/src/main/java/at/gv/egiz/eaaf/core/impl/idp/process/support/SecureRandomHolder.java
new file mode 100644
index 00000000..a297367f
--- /dev/null
+++ b/eaaf_core_utils/src/main/java/at/gv/egiz/eaaf/core/impl/idp/process/support/SecureRandomHolder.java
@@ -0,0 +1,61 @@
+/*******************************************************************************
+ * Copyright 2017 Graz University of Technology
+ * EAAF-Core Components has been developed in a cooperation between EGIZ,  
+ * A-SIT Plus, A-SIT, and Graz University of Technology.
+ *
+ * Licensed under the EUPL, Version 1.2 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * https://joinup.ec.europa.eu/news/understanding-eupl-v12
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ *  
+ * This product combines work with different licenses. See the "NOTICE" text
+ * file for details on the various modules and licenses.
+ * The "NOTICE" text file is part of the distribution. Any derivative works
+ * that you distribute must include a readable copy of the "NOTICE" text file.
+ *******************************************************************************/
+/*******************************************************************************
+ *******************************************************************************/
+/*******************************************************************************
+ *******************************************************************************/
+package at.gv.egiz.eaaf.core.impl.idp.process.support;
+
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+
+/**
+ * Holder for a secure random instance following the initialization on demand holder design pattern. The secure random
+ * instance is a singleton that is initialized on first usage.
+ * 
+ * @author tknall
+ * 
+ */
+public class SecureRandomHolder {
+
+	private SecureRandomHolder() {
+	}
+
+	private static final SecureRandom SRND_INSTANCE;
+	static {
+		try {
+			SRND_INSTANCE = SecureRandom.getInstance("SHA1PRNG");
+		} catch (NoSuchAlgorithmException e) {
+			throw new RuntimeException("Unable to instantiate SHA1PRNG.", e);
+		}
+	}
+
+	/**
+	 * Returns a secure random generator instance.
+	 * @return The secure random instance.
+	 */
+	public static SecureRandom getInstance() {
+		return SecureRandomHolder.SRND_INSTANCE;
+	}
+
+}
\ No newline at end of file
-- 
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