__init__.py 文件源码

def _rsa_verify_sig(sig_value, formatted, public_key_jsonld):
    """
     - sig_value: data to be verified
     - public_key: creator of this document's public_key 
     - tbv: to be verified
    """
    # TODO: Support other formats than just PEM
    public_key = serialization.load_pem_public_key(
        _get_value(public_key_jsonld, "publicKeyPem").encode("utf-8"),
        backend=default_backend())

    try:
        public_key.verify(
            base64.b64decode(sig_value.encode("utf-8")), formatted,
            padding.PSS(
                mgf=padding.MGF1(hashes.SHA256()),
                salt_length=padding.PSS.MAX_LENGTH),
            hashes.SHA256())
        return True
    except InvalidSignature:
        return False


# In the future, we'll be doing a lot more work based on what suite is
# selected.