Exception in thread “main” java.security.InvalidKeyException: Illegal key size or default parameters [duplicate]

问题

The code belows is throwing this error message:

Exception in thread "main" java.security.InvalidKeyException: Illegal key size or default parameters

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;

Does anybody know why I get that error?

回答1:

Probably you did not install the JCE Policy file yet.

Download this file:

Java 6
Java 7
Java 8

And Install the file in ${java.home}/jre/lib/security/.

${java.home} refers to your installation directory of Java

for mac:

open finder
press command + shift + g
type /Library/Java/JavaVirtualMachines
navigate to your version of JDK
then Contents/Home/jre/lib/security
unzip the downloaded file and place all files inside here

for 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>/

回答2:

Download the JCE for Java 7 from this link http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html

and open the path C:\Program Files\Java\jdk1.7.0_80\jre\lib\security and paste the two jars here.(Even if the two jars were already present replace those two jars)

回答3:

For JAVA 7 the download link is jce-7-download

Copy the two downloaded jars in Java\jdk1.7.0_10\jre\lib\security Take a backup of older jars to be on safer side.

回答4:

In case you using Mac with homebrew

brew cask install jce-unlimited-strength-policy

回答5:

As of JDK 1.8u151 it is not necessary to download the JCE libraries separately. Simply edit:

$JDK_HOME/jre/lib/security/java.security

and uncomment the line:

crypto.policy=unlimited

来源：https://stackoverflow.com/questions/19856324/exception-in-thread-main-java-security-invalidkeyexception-illegal-key-size-o

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