mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-30 18:10:56 +00:00
66 lines
1.6 KiB
Python
Executable File
66 lines
1.6 KiB
Python
Executable File
#!/usr/bin/env python3
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import sys
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import struct
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import binascii
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# encode vendor name, add length byte and padding to multiple of 4
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def encode_vendor(vname):
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vbin = vname.encode()
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vbin = struct.pack("<B", len(vbin)) + vbin
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vbin += b"\0" * (-len(vbin) & 3)
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return vbin
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def encode_pubkey(pubkey):
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if len(pubkey) != 64:
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raise Exception("Wrong public key length")
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return binascii.unhexlify(pubkey)
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def decode_vtrust(vtrust):
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t = 0xFFFF
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for i, b in enumerate(reversed(vtrust)):
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if b != ".":
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t &= ~(1 << i)
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return t
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def main():
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if len(sys.argv) < 7:
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print(
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'Usage build_vendorheader "pubkey1hex:pubkey2hex:..." m version vendortrust vendorname vendorimage.toif vendorheader.bin'
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)
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return 1
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keys = [encode_pubkey(x) for x in sys.argv[1].split(":")]
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m = int(sys.argv[2])
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(vmajor, vminor) = [int(x) for x in sys.argv[3].split(".")]
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vtrust = decode_vtrust(sys.argv[4])
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vname = sys.argv[5]
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ifn = sys.argv[6]
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ofn = sys.argv[7]
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if not ifn.endswith(".toif"):
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print("Must provide TOIF file")
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return 2
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expiry = 0
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vheader = b"TRZV" + struct.pack(
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"<IIBBBBH", 0, expiry, vmajor, vminor, m, len(keys), vtrust
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)
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vheader += 14 * b"\0"
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for k in keys:
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vheader += k
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vheader += encode_vendor(vname) + open(ifn, "rb").read()
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padding = 65 + (-len(vheader) - 65) & 511
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vheader += b"\0" * padding
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# put in length
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vheader = vheader[0:4] + struct.pack("<I", len(vheader)) + vheader[8:]
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with open(ofn, "wb") as f:
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f.write(vheader)
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main()
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