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BAEL-4614 JVM property java.security.egd

This commit is contained in:
Roger Yates 2021-01-09 07:54:57 +10:00
parent d978e58367
commit d3c73637c2
1 changed files with 23 additions and 0 deletions
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core-java-modules/core-java-security-2/src/main/java/com/baeldung/egd/JavaSecurityEgdTester.java Normal file
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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);
}
}