Java Security Illegal key size or default parameters

0 votes

We had asked a question about this earlier, but it didn't get answered right and led nowhere.

So we've clarified a few details on the problem and we would really like to hear your ideas on how could we fix this or what should we try?

I have Java 1.6.0.12 installed on my Linux server and the code below runs just perfectly.

String key = "av45k1pfb024xa3bl359vsb4esortvks74sksr5oy4s5serondry84jsrryuhsr5ys49y5seri5shrdliheuirdygliurguiy5ru";
try {
    Cipher c = Cipher.getInstance("ARCFOUR");

    SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "ARCFOUR");
    c.init(Cipher.DECRYPT_MODE, secretKeySpec);

    return new String(c.doFinal(Hex.decodeHex(data.toCharArray())), "UTF-8");

} catch (InvalidKeyException e) {
    throw new CryptoException(e);
}

Today I installed Java 1.6.0.26 on my server user and when I try to run my application, I get the following exception. My guess would be that it has something to do with the Java installation configuration because it works in the first one, but doesn't work in the later version.

Caused by: java.security.InvalidKeyException: Illegal key size or default parameters
    at javax.crypto.Cipher.a(DashoA13*..) ~[na:1.6]
    at javax.crypto.Cipher.a(DashoA13*..) ~[na:1.6]
    at javax.crypto.Cipher.a(DashoA13*..) ~[na:1.6]
    at javax.crypto.Cipher.init(DashoA13*..) ~[na:1.6]
    at javax.crypto.Cipher.init(DashoA13*..) ~[na:1.6]
    at my.package.Something.decode(RC4Decoder.java:25) ~[my.package.jar:na]
    ... 5 common frames omitted

Line 25 is: c.init(Cipher.DECRYPT_MODE, secretKeySpec);

Aug 23, 2018 in Java by samarth295
• 2,220 points
6,404 views

2 answers to this question.

+1 vote

Starting from Java 9 or 8u151, you can use comment a line in the file:

<JAVA_HOME>/jre/lib/security/java.security

And change:

#crypto.policy=unlimited

to

crypto.policy=unlimited

Hope it helps!!

If not then its recommended to join our Java training class and learn about Java in detail.

Thank You!!

answered Aug 23, 2018 by Parth
• 4,630 points
0 votes

The JRE/JDK/Java 8 jurisdiction files can be found here:

Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files 8 Download

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

answered Aug 23, 2019 by Sirajul
• 59,170 points

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