java - 线程 "main"java.security.UnrecoverableKeyException : Given final block not properly padded 中的异常

Question

大家好，我使用 AES 进行加密，我所做的是在文本文件中加密数据并存储给定位置，如果在同一个类文件中给出，解密工作正常，我创建了一个不同的 java类来解密文件，我使用带有用户名和密码的 Javakeystore 来存储 key 并检索它并使用存储的 key 来解密，但我收到上述错误。帮帮我。这是解密代码。

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.security.Key;
import java.security.KeyStore;
import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

import de.flexiprovider.core.FlexiCoreProvider;

public class Decrypto {

    public static void main(String[] args) throws Exception {
        Security.addProvider(new FlexiCoreProvider());

        /*
         * Cipher cipher1 = Cipher.getInstance("AES128_CBC", "FlexiCore");
         * KeyGenerator keyGen = KeyGenerator.getInstance("AES", "FlexiCore");
         * SecretKey secKey = keyGen.generateKey();
         * System.out.println(secKey);
         */
        Cipher cipher1 = Cipher.getInstance("AES128_CBC", "FlexiCore");
        KeyStore keyStore = KeyStore.getInstance("JCEKS");

        FileInputStream fis = new FileInputStream("C:\\mykey.keystore"); // here
                                                                         // i am
                                                                         // uploading
        keyStore.load(fis, "javaci123".toCharArray());
        fis.close();
        Key secKey = (Key) keyStore.getKey("mySecretKey",
                "javaci123".toCharArray()); // line 35

        System.out.println("Found Key: " + (secKey));

        String cleartextFile = "C:\\cleartext.txt";
        String ciphertextFile = "C:\\ciphertextSymm.txt";

        // FileInputStream fis = new FileInputStream(cleartextFile);
        FileOutputStream fos = new FileOutputStream(ciphertextFile);

        String cleartextAgainFile = "C:\\cleartextAgainSymm.txt";

        cipher1.init(Cipher.DECRYPT_MODE, secKey);
        fis = new FileInputStream(ciphertextFile);

        // fis = new FileInputStream(ciphertextFile);
        CipherInputStream cis = new CipherInputStream(fis, cipher1);
        fos = new FileOutputStream(cleartextAgainFile);
        byte[] block = new byte[8];
        int i;
        while ((i = fis.read(block)) != -1) {
            cis.read(block, 0, i);
        }
        cis.close();
    }

}

错误

  Exception in thread "main" java.security.UnrecoverableKeyException: Given final block not     properly padded
   at com.sun.crypto.provider.KeyProtector.unseal(KeyProtector.java:360)
  at com.sun.crypto.provider.JceKeyStore.engineGetKey(JceKeyStore.java:133)
  at java.security.KeyStore.getKey(Unknown Source)
  at darm.code.com.Decrypto.main(Decrypto.java:35)

Answer 1

UnrecoverableKeyException 可以识别问题，尤其是当根本原因是“给定的最终 block 未正确填充” 时。这基本上意味着您的密码不正确。 KeyStore 将首先根据给定的密码生成一个 key ，然后使用该 key 来解密存储的 key 。如果解密失败，您希望出现 MAC 身份验证错误，但在这种情况下，您会收到填充错误(这基本上意味着 某人 忘记向包含已包装私钥的容器添加完整性保护)。