def _get_signature(self) -> bytes:
"""Sign the DAR data using SignatureProvider."""
signature = super()._get_signature()
r, s = crypto.utils_cryptography.decode_dss_signature(signature)
public_numbers = crypto.EllipticCurvePublicNumbers(r, s, crypto.ec.SECP256R1())
signature = ecc_public_numbers_to_bytes(public_numbers=public_numbers, length=66)
return signature
def sign(self) -> None:
"""Sign the DC data using SignatureProvider."""
super().sign()
assert self.signature, "Debug Credential Signature is not set in base class"
r, s = crypto.utils_cryptography.decode_dss_signature(self.signature)
public_numbers = crypto.EllipticCurvePublicNumbers(r, s, self.CURVE)
self.signature = ecc_public_numbers_to_bytes(
public_numbers=public_numbers, length=self.CORD_LENGTH)
def _get_signature(data: bytes, rotk_priv_path: str) -> bytes:
"""Creates a cryptographic signature over the data.
:return: binary representing the signature
"""
priv_rotk = crypto.load_private_key(file_path=rotk_priv_path)
assert isinstance(priv_rotk,
crypto.EllipticCurvePrivateKeyWithSerialization)
signature = priv_rotk.sign(data,
crypto.ec.ECDSA(crypto.hashes.SHA256()))
r, s = utils_cryptography.decode_dss_signature(signature)
public_numbers = crypto.EllipticCurvePublicNumbers(
r, s, priv_rotk.curve)
return ecc_public_numbers_to_bytes(public_numbers=public_numbers)
