From d3c73637c287229ae619d020140fe433dc33f34a Mon Sep 17 00:00:00 2001
From: Roger Yates <587230+rojyates@users.noreply.github.com>
Date: Sat, 9 Jan 2021 07:54:57 +1000
Subject: [PATCH] BAEL-4614 JVM property java.security.egd

---
 .../baeldung/egd/JavaSecurityEgdTester.java   | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 core-java-modules/core-java-security-2/src/main/java/com/baeldung/egd/JavaSecurityEgdTester.java

diff --git a/core-java-modules/core-java-security-2/src/main/java/com/baeldung/egd/JavaSecurityEgdTester.java b/core-java-modules/core-java-security-2/src/main/java/com/baeldung/egd/JavaSecurityEgdTester.java
new file mode 100644
index 0000000000..347d3b4cba
--- /dev/null
+++ b/core-java-modules/core-java-security-2/src/main/java/com/baeldung/egd/JavaSecurityEgdTester.java
@@ -0,0 +1,23 @@
+package com.baeldung.egd;
+
+import java.security.SecureRandom;
+
+/**
+ * JavaSecurityEgdTester - run this with JVM parameter java.security.egd, e.g.:
+ *     java -Djava.security.egd=file:/dev/urandom -cp . com.baeldung.egd.JavaSecurityEgdTester
+ */
+public class JavaSecurityEgdTester {
+    public static final double NANOSECS = 1000000000.0;
+    public static final String JAVA_SECURITY_EGD = "java.security.egd";
+
+    public static void main(String[] args) {
+        SecureRandom secureRandom = new SecureRandom();
+        long start = System.nanoTime();
+        byte[] randomBytes = new byte[256];
+        secureRandom.nextBytes(randomBytes);
+        double duration = (System.nanoTime() - start) / NANOSECS;
+
+        String message = String.format("java.security.egd=%s took %.3f seconds and used the %s algorithm", System.getProperty(JAVA_SECURITY_EGD), duration, secureRandom.getAlgorithm());
+        System.out.println(message);
+    }
+}