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# CMSEncoderAddRecipients(_:_:)

Specifies a message is to be encrypted and specifies the recipients of the message.

```
func CMSEncoderAddRecipients(_ cmsEncoder: CMSEncoder, _ recipientOrArray: CFTypeRef) -> OSStatus
```

## Parameters

`cmsEncoder`

The CMSEncoder reference returned by the `CMSEncoderCreate` function.

`recipientOrArray`

Either a single certificate containing a public encryption key for one message recipient, specified as a certificate object (type [`SecCertificate`](/documentation/Security/SecCertificate)), or a set of certificates specified as a <doc://com.apple.documentation/documentation/CoreFoundation/CFArray> of certificate objects.

## Return Value

A result code. See [Security Framework Result Codes](/documentation/Security/security-framework-result-codes).

## Discussion

Your keychain must contain a certificate that supports encryption for each recipient. You can call this function more than once for the same message.

You can both sign and encrypt the same message; however, you cannot call both this function and the [`CMSEncoderSetHasDetachedContent(_:_:)`](/documentation/Security/CMSEncoderSetHasDetachedContent(_:_:)) function for the same message.

If you do call this function, you must call it before the first call to the [`CMSEncoderUpdateContent(_:_:_:)`](/documentation/Security/CMSEncoderUpdateContent(_:_:_:)) function.

## See Also

[`CMSEncoderUpdateContent(_:_:_:)`](/documentation/Security/CMSEncoderUpdateContent(_:_:_:))

Feeds content bytes into the encoder.

[`CMSEncoderCreate(_:)`](/documentation/Security/CMSEncoderCreate(_:))

Creates a CMSEncoder reference.

[`CMSEncoderCopyRecipients(_:_:)`](/documentation/Security/CMSEncoderCopyRecipients(_:_:))

Obtains the array of recipients specified with the `CMSEncoderAddRecipients` function.

[`CMSDecoderIsContentEncrypted(_:_:)`](/documentation/Security/CMSDecoderIsContentEncrypted(_:_:))

Determines whether a CMS message was encrypted.


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