Add Ki recovery from eKi and fix OPC return type#14
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binascii.hexlify returns bytes in Python 3, causing OPC values to be bytes instead of strings. This made dict output inconsistent (mixed str/bytes).
Adds aes_128_cbc_decrypt and recover_ki to reverse the eKi encryption, and a -e/--eki CLI flag to recover Ki (with OPC and eKi) from an encrypted triplet given the OP and Transport Key.
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Two changes:
Usage:
At C3GSM, we regularly order eSIMs and have this problem. We're using this code to generate eKi from Ki and also use it for the OPc values. It felt fair to upstream this back to you <3