SHA1 对字符串求摘要的实现

{测试结果}
对字符串 Hello, World!
求SHA1，结果为：0a0a9f2a6772942557ab5355d76af442f8f65e01

{测试代码}

package sup.orange.learn;



import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;



/**

 * Created by re-x on 11/4/14.

 */

public class HashTextTest {

    public static void main(String[] args) throws NoSuchAlgorithmException {

        System.out.println(sha1("Hello, World!"));

    }



    static String sha1(String input) throws NoSuchAlgorithmException {

        MessageDigest messageDigest = MessageDigest.getInstance("SHA1");

        byte[] result = messageDigest.digest(input.getBytes());

        StringBuffer sb = new StringBuffer();

        for (int i = 0; i < result.length; i++) {

            sb.append(Integer.toString((result[i] & 0xff) + 0x100, 16).substring(1));

        }



        return sb.toString();

    }

}