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# setSymmetricKey(_:)

Sets the symmetric encryption key that the context requires for symmetric encryption mode.

```
func setSymmetricKey(_ key: SymmetricKey) throws
```

## Parameters

`key`

The symmetric encryption key.

## Discussion

Use this function to set the encryption key for a context with a symmetric [`profile`](/documentation/AppleArchive/ArchiveEncryptionContext/profile-swift.property).

## See Also

  <doc://com.apple.documentation/documentation/CryptoKit/SymmetricKey>


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