java.lang.IllegalArgumentException: Key length not 128/192/256 bits!

[Tommaso Checchi]

Hi,

as by the title, I got this exception when running compiled code which uses a 128-bit key... 

The stack trace was:

at org.bouncycastle.crypto.engines.AESFastEngine.generateWorkingKey(Unknown Source)
at org.bouncycastle.crypto.engines.AESFastEngine.init(Unknown Source)
at org.bouncycastle.crypto.modes.CFBBlockCipher.init(Unknown Source)
at org.bouncycastle.crypto.BufferedBlockCipher.init(Unknown Source)

 

In fact the key used was 127 bytes, and it looks like that java's crypto libraries and bouncycastle have significant differences.

Original Java code generates a 128 bit (16 bytes) key from a 635 bytes cipher, while robovm-ed code generates a 127 bytes key from a 634 bytes (sometimes 635 indeed) cipher.

And uhm, not being a security expert I can't really make sense of this :D

Any thoughts?

Thanks,

Tommaso

[Tommaso Checchi]

Replying to myself again - this wasn't due to roboVM at all, it was due to bouncycastle selecting the wrong padding to decode the data.

[Niklas Therning]

Great! I'm glad to hear it worked out.

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