def verify_response()

in asfpy/crypto.py [0:0]

• 17 lines of code
• 6 McCabe index (conditional complexity)

    def verify_response(self, data: str):
        """Verifies the authenticity of a data blob. If signed by the private key,
        returns the original data that was signed, otherwise None"""
        try:
            if "\n" not in data:  # base64-encoded one-liner?
                try:
                    data = base64.b64decode(data).decode('us-ascii')
                except binascii.Error:  # Not base64!
                    return None
            signature, data_plus_nonce = data.split("\n", 1)
            signature = base64.b64decode(signature)
        except ValueError:  # Bad token format or invalid base64 signature, FAILURE.
            return
        try:
            _nonce, data_verified = data_plus_nonce.split("\n", 1)
            self._pubkey.verify(signature, data_plus_nonce.encode("us-ascii"))
            return data_verified
        except cryptography.exceptions.InvalidSignature:
            return