基于java类库的DES加密算法源码

你的名字 2022-03-01 17:42 98阅读 0赞

import java.security.*; 
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import javax.crypto.Cipher; 
    import javax.crypto.SecretKey; 
    import javax.crypto.SecretKeyFactory; 
    import javax.crypto.spec.DESKeySpec; 
    
    /** 
     * SSO加密算法样例
     */ 
    public class SecurityTest { 
    
    	
    //请使用系统中的正式密钥修改这里
    private static final String PASSWORD_CRYPT_KEY = "DC7726190BFD4E76"; 
    private final static String DES = "DES"; 
    
    /** 
     * 加密 
     * @param src 数据源 
     * @param key 密钥，长度必须是8的倍数 
     * @return   返回加密后的数据 
     * @throws Exception 
     */ 
    public static byte[] encrypt(byte[] src, byte[] key)throws Exception { 
                    //DES算法要求有一个可信任的随机数源 
                    SecureRandom sr = new SecureRandom(); 
                    // 从原始密匙数据创建DESKeySpec对象 
                    DESKeySpec dks = new DESKeySpec(key); 
                    // 创建一个密匙工厂，然后用它把DESKeySpec转换成 
                    // 一个SecretKey对象 
                    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES); 
                    SecretKey securekey = keyFactory.generateSecret(dks); 
                    // Cipher对象实际完成加密操作 
                    Cipher cipher = Cipher.getInstance(DES); 
                    // 用密匙初始化Cipher对象 
                    cipher.init(Cipher.ENCRYPT_MODE, securekey, sr); 
                    // 现在，获取数据并加密 
                    // 正式执行加密操作 
                    return cipher.doFinal(src); 
             } 
    
         
        /** 
         * 用户名加密 
         * @param password 
         * @return 
         * @throws Exception 
         */ 
        public final static String encrypt(String password){ 
            try { 
                return byte2hex(encrypt(password.getBytes(),PASSWORD_CRYPT_KEY.getBytes())); 
            }catch(Exception e) { 
            } 
            return null; 
        } 
    /** 
     * 二进制转字符串 
     * @param b 
     * @return 
     */ 
        public static String byte2hex(byte[] b) { 
                    String hs = ""; 
                    String stmp = ""; 
                    for (int n = 0; n < b.length; n++) { 
                            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF)); 
                            if (stmp.length() == 1) 
                                    hs = hs + "0" + stmp; 
                            else 
                                    hs = hs + stmp; 
                    } 
                    return hs.toUpperCase(); 
         } 
    
        public static byte[] hex2byte(byte[] b) { 
           if((b.length%2)!=0) 
                  throw new IllegalArgumentException("长度不是偶数"); 
                    byte[] b2 = new byte[b.length/2]; 
                    for (int n = 0; n < b.length; n+=2) { 
                        String item = new String(b,n,2); 
                        b2[n/2] = (byte)Integer.parseInt(item,16); 
                    } 
           return b2; 
        } 
    
        public static void main(String[] args) {
        	//当前时间
        	String  in_date=new SimpleDateFormat ("yyyyMMddHH").format(new Date());
        	//原始用户名
        	String username="zhangsan@qq.com";
        	//用户名与时间拼接
        	username =username+"::"+in_date;
            System.out.println("解密前="+username);
            //加密
            String data = encrypt(username);
            //输出加密字符串
            System.out.println("加密后="+data); 
        } 
    }