fix(api): Fixed better handling of multiple keys in sign()

Author: grantila

lib/u2f-api.ts

@@ -268,10 +268,15 @@ export function sign(
 
 			const appId = _signRequests[ 0 ].appId;
 			const challenge = _signRequests[ 0 ].challenge;
-			const registeredKeys = _signRequests
+			const registeredKeys = ( [ ] as Array< RegisteredKey > ).concat(
+				..._signRequests
 				.map( ( { version, keyHandle, appId } ) =>
-					( { version, keyHandle, appId } as RegisteredKey )
-				);
+					arrayify( keyHandle )
+					.map( keyHandle =>
+						( { version, keyHandle, appId } as RegisteredKey )
+					)
+				)
+			);
 
 			u2f.sign( appId, challenge, registeredKeys, callback, timeout );
 		} );

test/u2f-api/index.ts

@@ -271,10 +271,15 @@ describe( 'general', ( ) =>
 	{
 		await api.ensureSupport( );
 
-		const request = "req";
+		const request = {
+			version: 'U2F_V2',
+			appId,
+			challenge: 'Sk1hrSXt_KswFHOhTQ7BED45yQRU2gqY37dfBQ8nNiI',
+			keyHandle: 'foo',
+		};
 
-		await api.register( { appId, request } );
+		await api.register( request );
 
-		await api.sign( { appId, request } );
+		await api.sign( request );
 	} ) );
 } );