src/types.ml

@@ -170,3 +170,25 @@ module Denomination_key = struct
     | Rsa of Rsa_denomination_key.t
     | CS of CS_denomination_key.t
 end
+
+module Future_sign_key = struct
+end
+  // The actual exchange's EdDSA signing public key.
+  key: EddsaPublicKey;
+
+  // Initial validity date for the signing key.
+  stamp_start: Timestamp;
+
+  // Date when the exchange will stop using the signing key, allowed to overlap
+  // slightly with the next signing key's validity to allow for clock skew.
+  stamp_expire: Timestamp;
+
+  // Date when all signatures made by the signing key expire and should
+  // henceforth no longer be considered valid in legal disputes.
+  stamp_end: Timestamp;
+
+  // Signature over TALER_SigningKeyAnnouncementPS
+  // for this signing key by the signkey security
+  // module using purpose TALER_SIGNATURE_SM_SIGNING_KEY.
+  signkey_secmod_sig: EddsaSignature;
+}