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Import ECDSA keys into keydec

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JJTech0130 2023-07-26 18:22:41 -04:00
parent c0f58c2fe2
commit fd4764cb0c
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GPG key ID: 23C92EBCCF8F93D6
1 changed files with 14 additions and 6 deletions
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20
ids/keydec.py
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@ -15,7 +15,6 @@ class IdentityKeys():
assert input.read(5) == b'\x30\x81\xF6\x81\x43' # DER header
raw_ecdsa = input.read(67)
print(b64encode(raw_ecdsa).decode())
assert input.read(3) == b'\x82\x81\xAE' # DER header
raw_rsa = input.read(174)
@ -28,13 +27,19 @@ class IdentityKeys():
rsa_modulus = int.from_bytes(rsa_modulus, "big")
assert raw_rsa.read(5) == b'\x02\x03\x01\x00\x01' # Exponent, should always be 65537
# TODO: Parse the ECDSA key
# Parse the EC key
assert raw_ecdsa[:3] == b'\x00\x41\x04'
raw_ecdsa = raw_ecdsa[3:]
ec_x = int.from_bytes(raw_ecdsa[:32], "big")
ec_y = int.from_bytes(raw_ecdsa[32:], "big")
ec_key = ec.EllipticCurvePublicNumbers(ec_x, ec_y, ec.SECP256R1())
ec_key = ec_key.public_key()
# Construct a public key
rsa_key = rsa.RSAPublicNumbers(e=65537, n=rsa_modulus)
rsa_key = rsa_key.public_key()
return IdentityKeys(None, rsa_key)
return IdentityKeys(ec_key, rsa_key)
def encode(self) -> bytes:
output = BytesIO()
@ -44,10 +49,13 @@ class IdentityKeys():
raw_rsa.write(b'\x30\x81\xA9')
raw_rsa.write(b'\x02\x81\xA1')
raw_rsa.write(self.rsa_key.public_numbers().n.to_bytes(161, "big"))
raw_rsa.write(b'\x02\x03\x01\x00\x01')
raw_rsa.write(b'\x02\x03\x01\x00\x01') # Hardcode the exponent
output.write(b'\x30\x81\xF6\x81\x43')
output.write(b64decode("AEEEmJrxPoWDllRqLWVAnTOs6Fv9nJSvESM1LROiQJlkgsI+3Qdtd78RATQDx3nxLZcZFSpUB+m7MI2uamMpdxYdvA=="))
output.write(b'\x00\x41\x04')
output.write(self.ecdsa_key.public_numbers().x.to_bytes(32, "big"))
output.write(self.ecdsa_key.public_numbers().y.to_bytes(32, "big"))
output.write(b'\x82\x81\xAE')
output.write(raw_rsa.getvalue())