42 lines
1.3 KiB
Python
Executable File
42 lines
1.3 KiB
Python
Executable File
#!/usr/bin/env python3
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# example usage: ./rng_entropy_collector.py stm32_rng_1.dat 1048576
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# note: for reading large amounts of entropy, compile a firmware
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# that has DEBUG_RNG == 1 as that will disable the user button
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# push confirmation
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from __future__ import print_function
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import io
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import sys
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from trezorlib.client import TrezorClient
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from trezorlib.device import TrezorDevice
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def get_client():
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devices = TrezorDevice.enumerate() # list all connected TREZORs on USB
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if len(devices) == 0: # check whether we found any
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return None
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transport = devices[0] # use first connected device
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return TrezorClient(transport) # creates object for communicating with TREZOR
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def main():
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client = get_client()
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if not client:
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print('No TREZOR connected')
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return
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arg1 = sys.argv[1] # output file
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arg2 = int(sys.argv[2], 10) # total number of how many bytes of entropy to read
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step = 1024 if arg2 >= 1024 else arg2 # trezor will only return 1KB at a time
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with io.open(arg1, 'wb') as f:
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for i in range(0, arg2, step):
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entropy = client.get_entropy(step)
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f.write(entropy)
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client.close()
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if __name__ == '__main__':
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main()
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