InvalidKeyException java.security.InvalidKeyException：没有安装的提供程序支持此密钥：（空） [英] InvalidKeyException java.security.InvalidKeyException: No installed provider supports this key: (null)

问题描述

我有两个类，一个是主类，另一个是AES的实现。

I have two classes, one is main class and another is the implementation of AES.

但是，在我的AES类中，我有一种解密字符串的方法，但是每当我运行它时，它都会给出一个异常

However, in my AES class i have a method to decrypt a string, but whenever i run it, it gives an exception

我的加密方法可以正常工作，但是我的解密方法无法按预期工作。

My encryption method works just fine but my decryption method doesn't work as expected.

代码

private Cipher aesCipherForDecryption;
String strDecryptedText = new String();

public String decryptAES(final String ciphertext) {

    try {

        aesCipherForDecryption = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        aesCipherForDecryption.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(iV));
        byte[] byteDecryptedText = aesCipherForDecryption.doFinal(byteCipherText);
        strDecryptedText = new String(byteDecryptedText);

    } catch (IllegalBlockSizeException e) {
        System.out.print("IllegalBlockSizeException " +e);
    } catch (BadPaddingException e) {
        System.out.print("BadPaddingException "+e);
    } catch (NoSuchAlgorithmException e) {
        System.out.print("NoSuchAlgorithmException "+ e);
    } catch (NoSuchPaddingException e) {
        System.out.print("NoSuchPaddingException "+e);
    } catch (InvalidKeyException e) {
        System.out.print("InvalidKeyException "+e);
    } catch (InvalidAlgorithmParameterException e) {
        System.out.print("InvalidAlgorithmParameterException "+e);
    }

    System.out.println("\nDecrypted Text message is " + strDecryptedText);
    return strDecryptedText;
}

此方法输出的错误是

InvalidKeyException java.security.InvalidKeyException：没有安装的提供程序支持此密钥：（空）

InvalidKeyException java.security.InvalidKeyException: No installed provider supports this key: (null)

UPDATE＃1：

所以我已将代码更新如下

So i have updated the code as the following

public String decryptAES(byte[] ciphertext) {
    String strDecryptedText = new String();
        try {
            byte[] byteDecryptedText = aesCipherForDecryption.doFinal(ciphertext);

            strDecryptedText = new String(byteDecryptedText);

        } catch (IllegalBlockSizeException e) {
            System.out.print("IllegalBlockSizeException "+e);
            e.printStackTrace();
        } catch (BadPaddingException e) {
            System.out.print("BadPaddingException "+e);
            e.printStackTrace();
        }

    System.out.println("\nDecrypted Text message is " + strDecryptedText);
    return strDecryptedText;
}    

在主类中，我有这行

byte [] byteciphertext = ciphertext.getBytes();

只是将字符串转换为字节

just to convert the string to bytes

对吗？我仍然有

IllegalBlockSizeException javax.crypto.IllegalBlockSizeException: Input length must be multiple of 16 when decrypting with padded cipherjavax.crypto.IllegalBlockSizeException: Input length must be multiple of 16 when decrypting with padded cipher

解密时，输入长度必须为16的倍数

Could someone help me fix this issue?

谢谢。

推荐答案

secretKey 显然是 null。

其他问题：

• 您没有使用输入参数 cipherText 。


• 输入参数 cipherText 应该是 byte []，而不是 String ：密文为二进制，字符串不是二进制数据的容器。


• 结果字符串 strDecryptedText 应该是局部变量，而不是成员变量。

• You aren't using the input parameter cipherText.
• The input parameter cipherText should be a byte[], not a String: cipher text is binary, and String is not a container for binary data.
• The result string strDecryptedText should be a local variable, not a member variable.

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