Then, encrypt the same message M with BK2 and compare the obtained ciphers. However, I will have to recover JDKEK or TDKEK and I do not know where they are stored?Ģ) Encrypt a message M with SK before creating BK1 and the black blob. I have 2 choices:ġ) Decrypt BK2 in order to get the SK value. Now, I would like to verify that the session key in BK2 is equal to the one encrypted in BK1. In fact, the following relations are true:Ĥ) Decapsulate the black blob to get BK2= encryption-with-JDKEK2(SK) The recovered black key (BK2) is different from the initial BK1 because black keys are session keys (SK) which are encrypted with the temporary session JDKEK or TDKEK key. Then, at SoC reboot for example, we can recover a black key from the black blob. Note that with the current SM module, we can transform a black key (BK1) into a black blob which can be stored in non-volatile memory. I have made the secure memory module of CAAM working by applying the patches discussed in this previous thread: Re: i.MX6 CAAM : sm_test.c in 3.0.35 kernel broken I am using a Nitrogen6X running kernel 3.10.17. unhexlify ( ciphertext ), mode ) if mode = "ENCMTHD_3" : print decoded else : print decoded elif mode = "ENCMTHD_1" : #old rc4 mode argv if mode = "ENCMTHD_3" or mode = "ENCMTHD_2" : c = AESCipher ( aeskey ) decoded = c. decrypt ( enc )) def main (): #Keys hardcoded into netscaler libnscli90.soĪeskey = binascii. MODE_CBC, iv ) else : print "Invalid mode" return False return unpad ( cipher. MODE_ECB ) elif mode = "ENCMTHD_3" : iv = " \x00 " * 16 cipher = AES. key = key def decrypt ( self, enc, mode ): if mode = "ENCMTHD_2" : cipher = AES. I want to read this book on my Kindle, but the epub file is somehow encrypted. Import base64 from Crypto.Cipher import AES, ARC4 import binascii, sys BS = 16 unpad = lambda s : s )] #thanks for crypto snippetĬlass AESCipher : def _init_ ( self, key ): self. I bought a book from a website that has its own app to read this book. The below python script will decrypt LDAP and likely similar encrypted values (haven’t tested anything else) obtained from the config. You can also decode this using the below script.Īn example line from a new config may look like Otherwise if there is ENCMTHD_3 or ENCMTHD_2 and no -kek it uses the new AES256-CBC or AES256-ECB encryption method.You can decode this using the below script. ![]()
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