Calculates the SHA-1 digest and returns the value as a hex string. - Java Security

Java examples for Security:SHA

  1. HOME
  2. Java
  3. Security
  4. SHA

Description

Calculates the SHA-1 digest and returns the value as a hex string.

Demo Code


//package com.java2s;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    public static void main(String[] argv) throws Exception {
        String data = "java2s.com";
        System.out.println(shaHex(data));
    }/* w  w w.  j  a v a  2 s  . com*/

    /**
     * Calculates the SHA-1 digest and returns the value as a hex string.
     *
     * @param data Data to digest
     * @return SHA-1 digest as a hex string
     */
    public static String shaHex(String data) {
        MessageDigest messageDigest = getMessageDigest("SHA-1");

        byte[] digest = messageDigest.digest(data.getBytes());

        StringBuffer hexString = new StringBuffer();

        for (byte aDigest : digest) {
            hexString.append(Integer.toHexString(0x100 | 0xFF & aDigest)
                    .substring(1));
        }

        return hexString.toString();
    }

    /**
     * Returns a MessageDigest for the given algorithm.
     *
     * @param algorithm the name of the algorithm requested.
     * @return A MessageDigest instance
     * @throws RuntimeException
     */
    static MessageDigest getMessageDigest(String algorithm) {
        try {
            return MessageDigest.getInstance(algorithm);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e.getMessage());
        }
    }
}

Related Tutorials