Relax keys compatibility check

Signed-off-by: Sacha Kozma <[email protected]>

didcomm/core/utils.py

@@ -383,8 +383,45 @@ def get_did_and_optionally_kid(did_or_kid: DID_OR_DID_URL) -> (DID, Optional[DID
  return did, kid
 
 
+class _Crv(Enum):
+ ED25519 = "ED25519"
+ X25519 = "X25519"
+
+
+def _get_crv_for_verification_method(
+ key: VerificationMethod,
+) -> Optional[str]: # TODO switch to optionnal
+ if key.type in {
+ VerificationMethodType.ED25519_VERIFICATION_KEY_2020,
+ VerificationMethodType.ED25519_VERIFICATION_KEY_2018,
+ }:
+ return str(_Crv.ED25519)
+ elif key.type in {
+ VerificationMethodType.X25519_KEY_AGREEMENT_KEY_2020,
+ VerificationMethodType.X25519_KEY_AGREEMENT_KEY_2019,
+ }:
+ return str(_Crv.X25519)
+ elif key.type is VerificationMethodType.JSON_WEB_KEY_2020:
+ jwk = json_str_to_dict(key.verification_material.value)
+ return jwk["crv"]
+ else:
+ return None
+
+
 def are_keys_compatible(
  method1: Union[Secret, VerificationMethod], method2: VerificationMethod
+) -> bool:
+ crv_1 = _get_crv_for_verification_method(method1)
+ crv_2 = _get_crv_for_verification_method(method2)
+
+ if crv_1 is None or crv_2 is None:
+ return False
+
+ return crv_1 == crv_2
+
+
+def are_keys_compatible_old(
+ method1: Union[Secret, VerificationMethod], method2: VerificationMethod
 ) -> bool:
  if method1.type == method2.type and (
  method1.verification_material.format == method2.verification_material.format