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SecureRandom setSeed() method in Java
The random object can be reseeded using the setSeed() method in the class java.security.SecureRandom. This method requires a single parameter i.e. the required seed byte array and it returns the reseeded random object.
A program that demonstrates this is given as follows −
Example
import java.security.*;
import java.util.*;
public class Demo {
public static void main(String[] argv) {
try {
SecureRandom sRandom = SecureRandom.getInstance("SHA1PRNG");
String str = "Apple";
byte[] arrB = str.getBytes();
sRandom.setSeed(arrB);
byte[] arrSeed = sRandom.getSeed(5);
System.out.println("The reseeded Byte array is:");
for (int i = 0; i < arrSeed.length; i++) {
System.out.print(arrSeed[i] + " ");
}
} catch (NoSuchAlgorithmException e) {
System.out.println("Error!!! NoSuchAlgorithmException");
} catch (ProviderException e) {
System.out.println("Error!!! ProviderException");
}
}
}Output
The reseeded Byte array is: -88 71 -32 -124 55
Now let us understand the above program.
The setSeed() method is used to reseed the random object. Then the reseeded Byte array is displayed. The code snippet that demonstrates this is as follows −
try {
SecureRandom sRandom = SecureRandom.getInstance("SHA1PRNG");
String str = "Apple";
byte[] arrB = str.getBytes();
sRandom.setSeed(arrB);
byte[] arrSeed = sRandom.getSeed(5);
System.out.println("The reseeded Byte array is:");
for (int i = 0; i < arrSeed.length; i++) {
System.out.print(arrSeed[i] + " ");
}
}
Updated on: 30-Jul-2019
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