How to export SJCL AES key back to raw format?

Question

After I imported SJCL AES key using new sjcl.cipher.aes(rawKey), how can I get rawKey value back from the key instance?

Answer 1

As far as I know it is not easily possible. Looking at the code, the key is immediatly transformed using the S-Box. The result ist stored in this._key, so you could get that result and then use the reverse S-Box to restore rawKey. This should work, but just storing the key in a variable is of course way simpler.