我有两个类,一个是主类,另一个是AES的实现.

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,它都会产生异常

我的加密方法工作正常,但我的解密方法无法正常工作.

编码

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;
}

该方法输出的错误是

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

更新#1：

所以我更新了以下代码

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;
}    

在主班我有这条线

byte [] byteciphertext = ciphertext.getBytes();

只是将字符串转换为字节

这是正确的吗？我还有

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

有人可以帮我解决这个问题吗？

谢谢.

解决方法:

secretKey显然为null.

其他问题：

>您没有使用输入参数cipherText.
>输入参数cipherText应该是byte [],而不是字符串：密文是二进制的,并且String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.