Explicit token response (#29)

Author: raphaelrobert

draft-ietf-privacypass-batched-tokens.md

@@ -479,6 +479,16 @@ IANA, the Issuer MUST return an HTTP 422 (Unprocessable Content) error to the
 client. The issuer creates a BatchTokenResponse structured as follows:
 
 ~~~tls
+struct {
+  select (token_type) {
+    case (0x0001): /* Type VOPRF(P-384, SHA-384), RFC 9578 */
+      uint8_t evaluated_msg[Ne];
+      uint8_t evaluated_proof[Ns + Ns];
+    case (0x0002): /* Type Blind RSA (2048-bit), RFC 9578 */
+      uint8_t blind_sig[Nk];
+  }
+} TokenResponse;
+
 struct {
   optional<TokenResponse> token_response; /* Defined by token_type */
 } OptionalTokenResponse;