MD5 DES BASE64加密 解密

import java.security.MessageDigest;

import sun.misc.BASE64Encoder;

public class MD5 {
   //admin
	public static String md5(String source) {
		try {
			MessageDigest messageDigest = MessageDigest.getInstance("MD5");
			byte[] b = messageDigest.digest(source.getBytes("utf-8"));
			BASE64Encoder base64en = new BASE64Encoder();
			return base64en.encode(b);
		} catch (Exception e) {
			throw new RuntimeException("not support md5");
		}
	}

	 public static void main(String[] args) {
		 String result = MD5.md5("admin");
		 System.out.println(result);
		 
	}


}

package MD5;
import java.security.*;
import java.util.logging.Logger;

import javax.crypto.*;

import org.apache.commons.logging.Log;

public class DESSSO {
	private static String strDefaultKey = "national";

	private Cipher encryptCipher = null;

	private Cipher decryptCipher = null;

	/**
	 * 将byte数组转换为表示16进制值的字符串， 如：byte[]{8,18}转换为：0813， 和public static byte[]
	 * hexStr2ByteArr(String strIn) 互为可逆的转换过程
	 * 
	 * @param arrB 需要转换的byte数组
	 * @return 转换后的字符串
	 * @throws Exception 本方法不处理任何异常，所有异常全部抛出
	 */
	public static String byteArr2HexStr(byte[] arrB) throws Exception {
		int iLen = arrB.length;
		// 每个byte用两个字符才能表示，所以字符串的长度是数组长度的两倍
		StringBuffer sb = new StringBuffer(iLen * 2);
		for (int i = 0; i < iLen; i++) {
			int intTmp = arrB[i];
			// 把负数转换为正数
			while (intTmp < 0) {
				intTmp = intTmp + 256;
			}
			// 小于0F的数需要在前面补0
			if (intTmp < 16) {
				sb.append("0");
			}
			sb.append(Integer.toString(intTmp, 16));
		}
		return sb.toString();
	}

	/**
	 * 将表示16进制值的字符串转换为byte数组， 和public static String byteArr2HexStr(byte[] arrB)
	 * 互为可逆的转换过程
	 * 
	 * @param strIn
	 *            需要转换的字符串
	 * @return 转换后的byte数组
	 * @throws Exception
	 *             本方法不处理任何异常，所有异常全部抛出
	 * 
	 */
	public static byte[] hexStr2ByteArr(String strIn) throws Exception {
		byte[] arrB = strIn.getBytes();
		int iLen = arrB.length;

		// 两个字符表示一个字节，所以字节数组长度是字符串长度除以2
		byte[] arrOut = new byte[iLen / 2];
		for (int i = 0; i < iLen; i = i + 2) {
			String strTmp = new String(arrB, i, 2);
			arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
		}
		return arrOut;
	}

	/**
	 * 默认构造方法，使用默认密钥
	 * 
	 * @throws Exception
	 */
	public DESSSO() throws Exception {
		this(strDefaultKey);
	}

	/**
	 * 指定密钥构造方法
	 * 
	 * @param strKey
	 *            指定的密钥
	 * @throws Exception
	 */
	public DESSSO(String strKey) throws Exception {
		Security.addProvider(new com.sun.crypto.provider.SunJCE());
		Key key = getKey(strKey.getBytes());

		encryptCipher = Cipher.getInstance("DES");
		encryptCipher.init(Cipher.ENCRYPT_MODE, key);

		decryptCipher = Cipher.getInstance("DES");
		decryptCipher.init(Cipher.DECRYPT_MODE, key);
	}

	/**
	 * 加密字节数组
	 * 
	 * @param arrB
	 *            需加密的字节数组
	 * @return 加密后的字节数组
	 * @throws Exception
	 */
	public byte[] encrypt(byte[] arrB) throws Exception {
		return encryptCipher.doFinal(arrB);
	}

	/**
	 * 加密字符串
	 * 
	 * @param strIn
	 *            需加密的字符串
	 * @return 加密后的字符串
	 * @throws Exception
	 */
	public String encrypt(String strIn) throws Exception {
		return byteArr2HexStr(encrypt(strIn.getBytes()));
	}

	/**
	 * 解密字节数组
	 * 
	 * @param arrB
	 *            需解密的字节数组
	 * @return 解密后的字节数组
	 * @throws Exception
	 */
	public byte[] decrypt(byte[] arrB) throws Exception {
		return decryptCipher.doFinal(arrB);
	}

	/**
	 * 解密字符串
	 * 
	 * @param strIn
	 *            需解密的字符串
	 * @return 解密后的字符串
	 * @throws Exception
	 */
	public String decrypt(String strIn) throws Exception {
		return new String(decrypt(hexStr2ByteArr(strIn)));
	}

	/**
	 * 从指定字符串生成密钥，密钥所需的字节数组长度为8位 不足8位时后面补0，超出8位只取前8位
	 * 
	 * @param arrBTmp
	 *            构成该字符串的字节数组
	 * @return 生成的密钥
	 * @throws java.lang.Exception
	 */
	private Key getKey(byte[] arrBTmp) throws Exception {
		// 创建一个空的8位字节数组（默认值为0）
		byte[] arrB = new byte[8];

		// 将原始字节数组转换为8位
		for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
			arrB[i] = arrBTmp[i];
		}

		// 生成密钥
		Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");

		return key;
	}
	
	public static void main(String[] args) {   
		  try {   
		   String test = "hello java";
		   System.out.println("加密前的字符："+test);
		   
		   DESSSO des = new DESSSO("llg__");//自定义密钥   
		   String newStr = des.encrypt(test) ;
		   System.out.println("加密后的字符："+newStr);   
		   
		   
		   System.out.println("解密后的字符："+des.decrypt(newStr));   
		  } catch (Exception e) {   
		    e.printStackTrace();
		  }   
		}  
}

import java.io.UnsupportedEncodingException;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class Base64 {  
    // 加密  
    public static String getBase64(String str) {  
        byte[] b = null;  
        String s = null;  
        try {  
            b = str.getBytes("utf-8");  
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
        }  
        if (b != null) {  
            s = new BASE64Encoder().encode(b);  
        }  
        return s;  
    }  
  
    // 解密  
    public static String getFromBase64(String s) {  
        byte[] b = null;  
        String result = null;  
        if (s != null) {  
            BASE64Decoder decoder = new BASE64Decoder();  
            try {  
                b = decoder.decodeBuffer(s);  
                result = new String(b, "utf-8");  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
        return result;  
    }  
    
    public static void main(String[] args) {
		String str = "admin";
		String encode=getBase64(str);
		System.out.println(encode);
		
		System.out.println(getFromBase64(encode));
	}
}