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# Interface: GetKeyFunction<T, T2\>
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## Type parameters
| Name |
| :------ |
| `T` |
| `T2` |
## Callable
### GetKeyFunction
â–¸ **GetKeyFunction**(`protectedHeader`, `token`): `Uint8Array` \| [`KeyLike`](../types/types.KeyLike.md) \| `Promise`<`Uint8Array` \| [`KeyLike`](../types/types.KeyLike.md)\>
Generic Interface for consuming operations dynamic key resolution. No token components have been
verified at the time of this function call.
If you cannot match a key suitable for the token, throw an error instead.
#### Parameters
| Name | Type | Description |
| :------ | :------ | :------ |
| `protectedHeader` | `T` | JWE or JWS Protected Header. |
| `token` | `T2` | The consumed JWE or JWS token. |
#### Returns
`Uint8Array` \| [`KeyLike`](../types/types.KeyLike.md) \| `Promise`<`Uint8Array` \| [`KeyLike`](../types/types.KeyLike.md)\>
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