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Old 01-10-2018, 00:09
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RSA Public Key format

I dumped the license and the public key from an embaded device.
I'm 100% sure, that the license is signed with 1024 bits key, because the signature is 128 bytes length...

The public key is stored in a binary file (publickey.bin) but is 256 byte long and I can not identify in what format is stored.
I played many combinations with openssl (DER/PEM format, different crypto algos), but I can't produce the 256 bytes binary storage size for a 1024bits key.

Mabye somebody know any format to store 1024 bits binary Modulus in 256 bytes?

The dumped public key is:

Code:
...
Thanks for any advice

Last edited by leader; 01-11-2018 at 01:20.
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Old 01-11-2018, 01:24
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I succesfully reversed how the public modulus is stored in the binary file.
So I have the solution, the topic can be closed
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