# Interface: PrivateKey

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Interface to pass an asymmetric private key and, optionally, its associated JWK Key ID to be
added as a `kid` JOSE Header Parameter.

## Properties

### key

• **key**: [`CryptoKey`](https://developer.mozilla.org/docs/Web/API/CryptoKey)

An asymmetric private CryptoKey.

Its algorithm must be compatible with a supported [JWS Algorithm](../type-aliases/JWSAlgorithm.md).

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### kid?

• `optional` **kid?**: `string`

JWK Key ID to add to JOSE headers when this key is used. When not provided no `kid` (JWK Key
ID) will be added to the JOSE Header.