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[aes] Fix aes_fvsr_key_batch on CW305 #137

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Apr 17, 2023
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[aes] Fix aes_fvsr_key_batch on CW305 #137

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4 changes: 4 additions & 0 deletions cw/capture.py
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Original file line number Diff line number Diff line change
Expand Up @@ -449,6 +449,10 @@ def capture_aes_fvsr_key_batch(ot, ktp, capture_cfg, scope_type, gen_ciphertexts
# Seed the target's PRNG
ot.target.simpleserial_write("s", capture_cfg["batch_prng_seed"].to_bytes(4, "little"))

# Set and transfer the fixed key.
# Without the sleep statement, the CW305 seems to fail to configure the batch PRNG
# seed and/or the fixed key and then gets completely out of sync.
time.sleep(0.5)
key_fixed = bytearray([0x81, 0x1E, 0x37, 0x31, 0xB0, 0x12, 0x0A, 0x78,
0x42, 0x78, 0x1E, 0x22, 0xB2, 0x5C, 0xDD, 0xF9])
tqdm.write(f'Fixed key: {binascii.b2a_hex(bytes(key_fixed))}')
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