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BAEL-5641 How to Fix Slow SecureRandom Generator #18897

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Merged
merged 3 commits into from
Nov 18, 2025
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Merged

BAEL-5641 How to Fix Slow SecureRandom Generator #18897

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b8f8ed5
BAEL-5641_add_sample_code
MBuczkowski2025 Oct 29, 2025
1b761c8
BAEL-5641 add JHM benchmark
MBuczkowski2025 Nov 7, 2025
4b07645
BAEL-5641 parametrized version number in POM and formatting fix
MBuczkowski2025 Nov 15, 2025
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46 changes: 46 additions & 0 deletions core-java-modules/core-java-security-2/pom.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -24,11 +24,57 @@
<artifactId>bcprov-jdk18on</artifactId>
<version>${bouncycastle.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh-core.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh-generator-annprocess.version}</version>
</dependency>
</dependencies>

<properties>
<bouncycastle.version>1.76</bouncycastle.version>
<commons-codec.version>1.16.0</commons-codec.version>
<jmh-core.version>1.37</jmh-core.version>
<jmh-generator-annprocess.version>1.37</jmh-generator-annprocess.version>
</properties>

<build>
<plugins>
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>build-classpath</id>
<goals>
<goal>build-classpath</goal>
</goals>
<configuration>
<includeScope>runtime</includeScope>
<outputProperty>depClasspath</outputProperty>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<configuration>
<mainClass>BenchmarkRunner</mainClass>
<systemProperties>
<systemProperty>
<key>java.class.path</key>
<value>
${project.build.outputDirectory}${path.separator}${depClasspath}</value>
</systemProperty>
</systemProperties>
</configuration>
</plugin>
</plugins>
</build>

</project>
23 changes: 23 additions & 0 deletions ...rity-2/src/main/java/com/baeldung/securerandomtester/SecureRandomAvailableAlgorithms.java
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@@ -0,0 +1,23 @@
package com.baeldung.securerandomtester;

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

public class SecureRandomAvailableAlgorithms {

static String[] algorithmNames = { "NativePRNG", "NativePRNGBlocking", "NativePRNGNonBlocking", "PKCS11", "SHA1PRNG", "Windows-PRNG" };

public static void main(String[] args) {
for (int i = 0; i < algorithmNames.length; i++) {
String name = algorithmNames[i];
Boolean isAvailable = true;
try {
SecureRandom random = SecureRandom.getInstance(name);
} catch (NoSuchAlgorithmException e) {
isAvailable = false;
}

System.out.println("Algorithm " + name + (isAvailable ? " is" : " isn't") + " available");
}
}
}
51 changes: 51 additions & 0 deletions ...security-2/src/main/java/com/baeldung/securerandomtester/SecureRandomPerformanceTest.java
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@@ -0,0 +1,51 @@
package com.baeldung.securerandomtester;

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@State(Scope.Thread)
public class SecureRandomPerformanceTest {

SecureRandom randomNativePRNGBlocking;
SecureRandom randomNativePRNGNonBlocking;

final int NBYTES = 256;
final int NSAMPLES = 20_000;

@Setup(Level.Trial)
public void setup() throws NoSuchAlgorithmException {
randomNativePRNGBlocking = SecureRandom.getInstance("NativePRNGBlocking");
randomNativePRNGNonBlocking = SecureRandom.getInstance("NativePRNGNonBlocking");
}

@Benchmark
public void measureTimePRNGBlocking() {
byte[] randomBytes = new byte[NBYTES];
for (int i = 0; i < NSAMPLES; i++) {
randomNativePRNGBlocking.nextBytes(randomBytes);
}
}

@Benchmark
public void measureTimePRNGNonBlocking() {
byte[] randomBytes = new byte[NBYTES];
for (int i = 0; i < NSAMPLES; i++) {
randomNativePRNGNonBlocking.nextBytes(randomBytes);
}
}

public static void main(String[] args) throws Exception {
org.openjdk.jmh.Main.main(args);
}
}