Md5加密

package com.tcwl.vsmp.utils;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

/**
 * 
 * @author Administrator
 *
 */
public class DecriptUtil
{

    /**
     * 对字符串进行sha1加密
     * @param decript 参数
     * @return 结果
     */
    public static String sha1(String decript)
    {
        try
        {
            MessageDigest digest = java.security.MessageDigest
                    .getInstance("SHA-1");
            digest.update(decript.getBytes());
            byte[] messageDigest = digest.digest();
            // Create Hex String
            StringBuffer hexString = new StringBuffer();
            // 字节数组转换为 十六进制 数


            for (int i = 0; i < messageDigest.length; i++)
            {
                String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);
                if (shaHex.length() < 2)
                {
                    hexString.append(0);
                }
                hexString.append(shaHex);
            }
            return hexString.toString();

        }
        catch (NoSuchAlgorithmException e)
        {
            e.printStackTrace();
        }
        return "";
    }

    /**
     * 
     * @param decript 字符串

     * @return 结果
     */
    public static String sha(String decript)
    {
        try
        {
            MessageDigest digest = java.security.MessageDigest
                    .getInstance("SHA");
            digest.update(decript.getBytes());
            byte[] messageDigest = digest.digest();
            // Create Hex String
            StringBuffer hexString = new StringBuffer();
            // 字节数组转换为 十六进制 数


            for (int i = 0; i < messageDigest.length; i++)
            {
                String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);
                if (shaHex.length() < 2)
                {
                    hexString.append(0);
                }
                hexString.append(shaHex);
            }
            return hexString.toString();

        }
        catch (NoSuchAlgorithmException e)
        {
            e.printStackTrace();
        }
        return "";
    }

    /**
     * md5加密
     * @param input 字符串

     * @return 结果
     */
    public static String md5(String input)
    {
        try
        {
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要


            mdInst.update(input.getBytes());
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            StringBuffer hexString = new StringBuffer();
            // 字节数组转换为 十六进制 数


            for (int i = 0; i < md.length; i++)
            {
                String shaHex = Integer.toHexString(md[i] & 0xFF);
                if (shaHex.length() < 2)
                {
                    hexString.append(0);
                }
                hexString.append(shaHex);
            }
            return hexString.toString();
        }
        catch (NoSuchAlgorithmException e)
        {
            e.printStackTrace();
        }
        return "";
    }

    /**
     * 加密
     *
     * @param content
     *            需要加密的内容
     * @param password
     *            加密密码
     * @return  结果
     */
    public static byte[] encryptAES(String content, String password)
    {
        try
        {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            kgen.init(128, new SecureRandom(password.getBytes()));
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES"); // 创建密码器


            byte[] byteContent = content.getBytes("utf-8");
            cipher.init(Cipher.ENCRYPT_MODE, key); // 初始化


            byte[] result = cipher.doFinal(byteContent);
            return result; // 加密
        }
        catch (NoSuchAlgorithmException e)
        {
            e.printStackTrace();
        }
        catch (NoSuchPaddingException e)
        {
            e.printStackTrace();
        }
        catch (InvalidKeyException e)
        {
            e.printStackTrace();
        }
        catch (UnsupportedEncodingException e)
        {
            e.printStackTrace();
        }
        catch (IllegalBlockSizeException e)
        {
            e.printStackTrace();
        }
        catch (BadPaddingException e)
        {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 解密
     *
     * @param content
     *            待解密内容

    
     * @param password
     *            解密密钥
     * @return  结果
     */
    public static byte[] decryptAES(byte[] content, String password)
    {
        try
        {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            kgen.init(128, new SecureRandom(password.getBytes()));
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES"); // 创建密码器


            cipher.init(Cipher.DECRYPT_MODE, key); // 初始化


            byte[] result = cipher.doFinal(content);
            return result; // 加密
        }
        catch (NoSuchAlgorithmException e)
        {
            e.printStackTrace();
        }
        catch (NoSuchPaddingException e)
        {
            e.printStackTrace();
        }
        catch (InvalidKeyException e)
        {
            e.printStackTrace();
        }
        catch (IllegalBlockSizeException e)
        {
            e.printStackTrace();
        }
        catch (BadPaddingException e)
        {
            e.printStackTrace();
        }
        return null;
    }

}

使用： 

String sign = DecriptUtil.md5(signTemp).toUpperCase();