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Missing licence error for a product i dont need

Asked by Benedikt L on 15 Mar 2019
Latest activity Commented on by Benedikt L on 18 Mar 2019
Hello,
I'm using R2017b, Output of ver:
-----------------------------------------------------------------------------------------------------
MATLAB Version: 9.3.0.713579 (R2017b)
MATLAB License Number: xxxxxxxxxxx
Operating System: Microsoft Windows 7 Enterprise Version 6.1 (Build 7601: Service Pack 1)
Java Version: Java 1.8.0_121-b13 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
-----------------------------------------------------------------------------------------------------
MATLAB Version 9.3 (R2017b)
Simulink Version 9.0 (R2017b)
I want to use some of the RSA capabilities of Java for a MATLAB project.
This is my code:
keygen = java.security.KeyPairGenerator.getInstance("RSA");
keygen.initialize(2048);
key = keygen.generateKeyPair;
cipher = javax.crypto.Cipher.getInstance('RSA');
cipher.init(cipher.ENCRYPT_MODE, key);
This code gives me the following error output:
To use 'init', at least one of the following products must be licensed, installed, and enabled:
Neural Network Toolbox
System Identification Toolbox
Error in Untitled (line 6)
cipher.init(cipher.ENCRYPT_MODE, key);
I don't think that I need this kind of Toolboxes for this Java-RSA functionality. Is it a bug? How can I fix it?
Best regards
Benedikt

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R2017b

1 Answer

Answer by Andreas Goser on 18 Mar 2019
Edited by Andreas Goser on 18 Mar 2019
 Accepted Answer

Not knowing what the code actually does, I can the following error:
cipher.init(cipher.ENCRYPT_MODE, key);
No method 'init' with matching signature found for class 'javax.crypto.Cipher'.
And ecesuting "license('inuse')" after that only returns MATLAB. So your assumption might be true, those products are not needed, but it does not explain the different behaviour. Did you install any 3rd party toos? Anything that modifies search paths or shadows existing functionality? You may want to try:
rehash toolboxcache
restoredefaultpath
savepath

  1 Comment

Thank you Andreas, your answer showed me the right track.
The root of the problem was in the argument type of the java function. Sadly it was hard to find the problem due to the misleading error message.
Best regards
Benedikt

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