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# authenticateComponents:withData:

Returns a Boolean value that indicates whether given authentication data is valid for a given set of components.

```
- (BOOL) authenticateComponents:(NSArray *) components withData:(NSData *) signature;
```

## Parameters

`components`

An array that contains `NSData` and `NSPort` objects belonging to an `NSPortMessage` object. See the [`PortMessage`](/documentation/Foundation/PortMessage) class specification for more information.

`signature`

Authentication data created by the delegate of the peer `NSConnection` object with [`authenticationDataForComponents:`](/documentation/Foundation/NSConnectionDelegate/authenticationDataForComponents:).

## Return Value

<doc://com.apple.documentation/documentation/Swift/true> if the `signature` provided is valid for `components`, otherwise <doc://com.apple.documentation/documentation/Swift/false>.

## Discussion

Use this message for validation of incoming messages. An `NSConnection` object raises an `NSFailedAuthenticationException` on receipt of a remote message the delegate doesn’t authenticate.

## See Also

  [Distributed Objects Programming Topics](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/DistrObjects/DistrObjects.html#//apple_ref/doc/uid/10000102i)


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