Question

今天按照指南我尝试加密并在解密字符串后。不幸的是，我得到了InvalidKeyException，我搜索了一下，发现加密一个字符串超过128位（16字节 - > 16个字符）我需要JCE，所以我进入了oracle网站，下载并将其放在我的java构建路径上，文件夹/lib/security下。仍然没有运气，我仍然不断收到此错误，使用此代码：

import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class EncryptTests {
  public static void main(String[] args) throws Exception {
        byte[] input = "www.java2s.com".getBytes();
        byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
            0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 };

        SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        System.out.println(new String(input));

        // encryption pass
        cipher.init(Cipher.ENCRYPT_MODE, key);

        byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
        int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
        ctLength += cipher.doFinal(cipherText, ctLength);
        System.out.println(new String(cipherText));
        System.out.println(ctLength);

        // decryption pass
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
        int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
        ptLength += cipher.doFinal(plainText, ptLength);
        System.out.println(new String(plainText));
        System.out.println(ptLength);
      }
    }

这是控制台输出：

www.java2s.com线程中的异常＆＃34; main＆＃34; java.security.InvalidKeyException：非法密钥大小或默认值 javax.crypto.Cipher.checkCryptoPerm中的参数（Cipher.java:1026）在javax.crypto.Cipher.implInit（Cipher.java：801）at javax.crypto.Cipher.chooseProvider（Cipher.java:864）at javax.crypto.Cipher.init（Cipher.java:1249）at javax.crypto.Cipher.init（Cipher.java:1186）at EncryptTests.main（EncryptTests.java:23）

任何修复？：）

InvalidKeyException，但我有所需的一切

0 个答案: