mirror of
https://github.com/trezor/trezor-firmware.git
synced 2025-07-20 21:48:14 +00:00
51 lines
1.4 KiB
Python
51 lines
1.4 KiB
Python
import sys
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from pathlib import Path
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from cryptography.hazmat.primitives import serialization
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from cryptography.hazmat.primitives.asymmetric import ec
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from pyasn1.codec.der.decoder import decode
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from pyasn1.codec.der.encoder import encode
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from pyasn1.type.univ import BitString
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from pyasn1_modules import rfc2459
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def load_certificate(data: bytes):
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return decode(data, asn1Spec=rfc2459.Certificate())[0]
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def save_certificate(certificate) -> bytes:
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return encode(certificate)
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def calculate_ecdsa_public_key():
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privkey_bytes = b"\x01" + b"\x00" * 31
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private_key = ec.derive_private_key(
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int.from_bytes(privkey_bytes, "big"), ec.SECP256R1()
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)
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return private_key.public_key()
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def replace_public_key(certificate, public_key):
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public_key_bytes = public_key.public_bytes(
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encoding=serialization.Encoding.X962,
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format=serialization.PublicFormat.UncompressedPoint,
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)
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certificate["tbsCertificate"]["subjectPublicKeyInfo"]["subjectPublicKey"] = (
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BitString(hexValue=public_key_bytes.hex())
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)
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def main():
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in_cert = Path(sys.argv[1])
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certificate = load_certificate(in_cert.read_bytes())
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public_key = calculate_ecdsa_public_key()
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replace_public_key(certificate, public_key)
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updated_cert = save_certificate(certificate)
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out_cert = Path(sys.argv[2])
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out_cert.write_bytes(updated_cert)
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if __name__ == "__main__":
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main()
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