Question

我正在运行一个来自互联网的java字符串加密/解密类！这是几乎没有修改的类：

公共类EncrypterDecrypter { 密码; Cipher dcipher;

EncrypterDecrypter(SecretKey key)
{
    try {
        ecipher = Cipher.getInstance("DES");
        dcipher = Cipher.getInstance("DES");
        ecipher.init(Cipher.ENCRYPT_MODE, key);
        dcipher.init(Cipher.DECRYPT_MODE, key);

    } catch (javax.crypto.NoSuchPaddingException e) {
    } catch (java.security.NoSuchAlgorithmException e) {
    } catch (java.security.InvalidKeyException e) {
    }
}

}

公共类EncryptionTester {

public static void main(String[] args)
{
    try
    {
        //Generate a temporary key.
        SecretKey key = KeyGenerator.getInstance("DES").generateKey();

        //Create Encrypter/Decrypter class
        EncrypterDecrypter crypto = new EncrypterDecrypter(key);

        //More lines of code to use crypto object
    }
     catch (Exception e)
     {
     } 
}

}

我的问题是，每次我创建一个新的EncrypterDecrypter类实例我都会获得不同的加密字符串，但加密的字符串仍然是相同的！我的想法告诉我，问题是SecretKey对象，每次创建一个新实例时都会不断更改，我想知道如何为所有Encrypter / Decrypter类实例使SecretKey对象相同，如果是问题的原因！

Answer 1

从字节数组生成SecretKey ..

byte raw[] = new byte[]{0x001,0x002,0X002,0X002,0X002,0X002,0X002,0X002,0X002,0X002,0X002,0X002,0X002,0X002,0X002,0X002};
        SecretKeySpec spec = new SecretKeySpec(raw, "DES");

Answer 2

如果您使用javax.crypto包，则加密和解密方法看起来没问题。尝试生成你的密钥：

final SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
final SecretKey key = skf.generateSecret(new DESKeySpec(new byte [] {/*The key*/}));
instance.EncrypterDecrypter(key);                     //Initialization of your Cipher objects
String encrypted = instance.encrypt("This is a test");
System.out.println(instance.decrypt(encrypted));      //"This is a test"

你应该在捕获中做点什么。

String Encryption / Decryption类，产生不同的输出

2 个答案: