Fixed an issue where ONS lookups stopped working

LibSession-Util

@@ -1 +1 @@
-Subproject commit f0016f512956c3f8fef83e3daf17e76fec272968
+Subproject commit 116256ab521e421420ed9bcd9e10cb0e9c78e468

SessionSnodeKit/Crypto/Crypto+SessionSnodeKit.swift

@@ -17,27 +17,42 @@ internal extension Crypto.Generator {
             id: "sessionId_for_ONS_response",
             args: [name, response]
         ) {
-            guard let hexEncodedNonce: String = response.result.nonce else {
+            guard var cName: [CChar] = name.lowercased().cString(using: .utf8) else {
                 throw SnodeAPIError.onsDecryptionFailed
             }
             
             // Name must be in lowercase
             var cCiphertext: [UInt8] = Array(Data(hex: response.result.encryptedValue))
-            var cNonce: [UInt8] = Array(Data(hex: hexEncodedNonce))
             var cSessionId: [CChar] = [CChar](repeating: 0, count: 67)
             
-            guard
-                cNonce.count == 24,
-                var cName: [CChar] = name.lowercased().cString(using: .utf8),
-                session_decrypt_ons_response(
-                    &cName,
-                    cName.count,
-                    &cCiphertext,
-                    cCiphertext.count,
-                    &cNonce,
-                    &cSessionId
-                )
-            else { throw SnodeAPIError.onsDecryptionFailed }
+            // Need to switch on `result.nonce` and explciitly pass `nil` because passing an optional
+            // to a C function doesn't seem to work correctly
+            switch response.result.nonce {
+                case .none:
+                    guard
+                        session_decrypt_ons_response(
+                            &cName,
+                            &cCiphertext,
+                            cCiphertext.count,
+                            nil,
+                            &cSessionId
+                        )
+                    else { throw SnodeAPIError.onsDecryptionFailed }
+                    
+                case .some(let nonce):
+                    var cNonce: [UInt8] = Array(Data(hex: nonce))
+                    
+                    guard
+                        cNonce.count == 24,
+                        session_decrypt_ons_response(
+                            &cName,
+                            &cCiphertext,
+                            cCiphertext.count,
+                            &cNonce,
+                            &cSessionId
+                        )
+                    else { throw SnodeAPIError.onsDecryptionFailed }
+            }
             
             return String(cString: cSessionId)
         }