sha1.java

package cns;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.*;
public class sha1 {
public static void main(String args[]) throws NoSuchAlgorithmException
{
 Scanner sc=new Scanner(System.in);
 System.out.println("Enter input String(Plain text Message): ");
 String str = sc.next();
 String hashcode;
 MessageDigest md;
 try {
 // getInstance() method is called with algorithm SHA-512
 md = MessageDigest.getInstance("SHA1");
 // digest() method is called
 // to calculate message digest of the input string str
 // returned as array of byte
 byte[] messageDigest = md.digest(str.getBytes());
 // Convert byte array into signum representation
 BigInteger no = new BigInteger(1, messageDigest);
 // Convert message digest into hex value
 hashcode = no.toString(16);
 // Add preceding 0s to make it 32 bit
 while (hashcode.length() < 32) {
 hashcode = "0" + hashcode;
 }
 }
 // For specifying wrong message digest algorithms
 catch (NoSuchAlgorithmException e) {
 throw new RuntimeException(e);
 }
 System.out.println("HashCode Generated by SHA-512 for: ");
 System.out.println("\n" + str + " is : " + hashcode);
 System.out.println("Message digest object info: ");
System.out.println(" Algorithm = " +md.getAlgorithm());
System.out.println(" Provider = " +md.getProvider());
System.out.println(" ToString = " +md.toString());
}
}