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SecureRandom generateSeed() method in Java
The number of seed bytes can be obtained using the method generateSeed() in class java.security.SecureRandom. This method requires a single parameter i.e. the number of seed bytes and it returns the seed bytes that are generated.
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");
byte[] arrB = sRandom.generateSeed(5);
System.out.println("The seed bytes generated are: " + Arrays.toString(arrB));
} catch (NoSuchAlgorithmException e) {
System.out.println("Error!!! NoSuchAlgorithmException");
}
}
}Output
The seed bytes generated are: [16, -115, 126, -30, 39]
Now let us understand the above program.
The method generateSeed() is used to obtain the required number of seed bytes in a byte array arrB[]. Then the seed bytes are displayed. If the algorithm is wrong, then the exception of NoSuchAlgorithmException is thrown. A code snippet that demonstrates is given as follows −
try {
SecureRandom sRandom = SecureRandom.getInstance("SHA1PRNG");
byte[] arrB = sRandom.generateSeed(5);
System.out.println("The seed bytes generated are: " + Arrays.toString(arrB));
} catch (NoSuchAlgorithmException e) {
System.out.println("Error!!! NoSuchAlgorithmException");
}
Updated on: 30-Jul-2019
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