SecureRandom generateSeed() method in Java with Examples
Last Updated :
06 Jun, 2021
The generateSeed() method of java.security.SecureRandom class is used to return the given number of seed bytes, computed using the seed generation algorithm that this class uses to seed itself. This call may be used to seed other random number generators.
Syntax:
public byte[] generateSeed(int numBytes)
Parameters: This method takes the number of seed bytes to generate as parameter.
Return Value: This method returns the generated seed bytes.
Below are the examples to illustrate the generateSeed() method:
Note:
- This program will not run on online IDE.
- Every time Secure Random class will generate random output.
Example 1:
Java
import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
{
try {
SecureRandom sr = SecureRandom.getInstance( "SHA1PRNG" );
byte [] arr = sr.generateSeed( 8 );
System.out.println(Arrays.toString(arr));
}
catch (NoSuchAlgorithmException e) {
System.out.println( "Exception thrown : " + e);
}
}
}
|
Output:
[24, -16, -12, 25, -3, 66, -90, 103]
Example 2:
Java
import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
{
try {
System.out.println( "Trying to get the instance from an unknown source" );
SecureRandom sr = SecureRandom.getInstance( "TAJMAHAL" );
byte [] arr = sr.generateSeed( 5 );
System.out.println( "Seed Bytes: " + Arrays.toString(arr));
}
catch (NoSuchAlgorithmException e) {
System.out.println( "Exception thrown : " + e);
}
}
}
|
Output:
Trying to get the instance from an unknown source
Exception thrown : java.security.NoSuchAlgorithmException: TAJMAHAL SecureRandom not available
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