DES - Java编程: 使用DES加密/解密

DES是一种对称加密方法，这里演示其ECB加密

范例一

try
{
    // 创建key
    String password = "12345678";
    byte[] b = password.getBytes();
    

    DESKeySpec dks = new DESKeySpec(b);
    
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance( "DES" );
    SecretKey key = keyFactory.generateSecret( dks );
    
    // 创建cipher
    Cipher cipher = Cipher.getInstance("DES");
    cipher.init(Cipher.ENCRYPT_MODE, key);
    
    // 加密，对于DES来说应用调用update( )，而不是doFinal( )
    String plain = "shaofa00";
    byte [] input = plain.getBytes();
    byte [] output = cipher.update(plain.getBytes());
    
}
catch(Exception e)
{
    
}

范例二 (推荐)

try
{
    String password = "12345678";
    byte[] b = password.getBytes();            
    
    SecretKeySpec ks = new SecretKeySpec(b, "DES");
    
    Cipher cipher = Cipher.getInstance("DES");
    cipher.init(Cipher.ENCRYPT_MODE, ks);
    
    String plain = "shaofa00";
    byte [] input = plain.getBytes();
    byte [] output = cipher.update(plain.getBytes());
    
    System.out.println("haha");
}
catch(Exception e)
{
    
}