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# SSLSetClientSideAuthenticate(_:_:)

Specifies the requirements for client-side authentication.

```
func SSLSetClientSideAuthenticate(_ context: SSLContext, _ auth: SSLAuthenticate) -> OSStatus
```

## Parameters

`context`

An SSL session context reference.

`auth`

A flag setting the requirements for client-side authentication. See [`SSLAuthenticate`](/documentation/Security/SSLAuthenticate) for possible values.

## Return Value

A result code. See [Secure Transport Result Codes](/documentation/Security/secure-transport-result-codes).

## Discussion

This function can be called only by servers. Use of this function is optional. The default authentication requirement is [`SSLAuthenticate.neverAuthenticate`](/documentation/Security/SSLAuthenticate/neverAuthenticate). This function may be called only when no session is active.

---

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