线程“main”中的异常java.security.InvalidKeyException：非法的键大小或默认参数

参见英文答案 > InvalidKeyException Illegal key size                                    5个
下面的代码抛出此错误消息：

线程“main”中的异常java.security.InvalidKeyException：非法的键大小或默认参数

Cipher dcipher;

byte[] salt = new String("12345678").getBytes();
int iterationCount = 1024;
int keyStrength = 256;
SecretKey key;
byte[] iv;

Decrypter(String passPhrase) throws Exception {
    SecretKeyFactory factory = SecretKeyFactory
            .getInstance("PBKDF2WithHmacSHA1");
    System.out.println("factory +" + factory);
    KeySpec spec = new PBEKeySpec(passPhrase.toCharArray(), salt,
            iterationCount, keyStrength);
    System.out.println("spec  " + spec);
    SecretKey tmp = factory.generateSecret(spec);
    System.out.println();
    key = new SecretKeySpec(tmp.getEncoded(), "AES");
    dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
}

public String encrypt(String data) throws Exception {
    dcipher.init(Cipher.ENCRYPT_MODE, key);
    AlgorithmParameters params = dcipher.getParameters();
    iv = params.getParameterSpec(IvParameterSpec.class).getIV();
    byte[] utf8EncryptedData = dcipher.doFinal(data.getBytes());
    String base64EncryptedData = new sun.misc.BASE64Encoder()
            .encodeBuffer(utf8EncryptedData);

    System.out.println("IV "
            + new sun.misc.BASE64Encoder().encodeBuffer(iv));
    System.out.println("Encrypted Data " + base64EncryptedData);
    return base64EncryptedData;

有人知道我为什么会收到这个错误吗？

解决方法:

可能你还没有安装JCE Policy文件.

下载此文件：

> Java 6
> Java 7
> Java 8

并在${java.home} / jre / lib / security /中安装该文件.

${java.home}指的是Java的安装目录

对于mac：

>开放式发现者
>按命令shift g
> type / Library / Java / JavaVirtualMachines
>导航到您的JDK版本
>然后是Contents / Home / jre / lib / security
>解压缩下载的文件并将所有文件放在此处

用于CLI

unzip downloaded_policy_file.zip  -d /Library/Java/JavaVirtualMachines/<JDK_VERSION>/Contents/Home/jre/lib/security/

mv /Library/Java/JavaVirtualMachines/<JDK_VERSION>/Contents/Home/jre/lib/security/UnlimitedJCEPolicyJDK<VERSION>/* /Library/Java/JavaVirtualMachines/<JDK_VERSION>/Contents/Home/jre/lib/security  

rm -rf Library/Java/JavaVirtualMachines/<JDK_VERSION>/Contents/Home/jre/lib/security/UnlimitedJCEPolicyJDK<VERSION>/

标签：jce,java
来源： https://codeday.me/bug/20190928/1828250.html