# Interface: GetKeyFunction<T, T2\>

[types](../modules/types.md).GetKeyFunction

## Type parameters

| Name |
| :------ |
| `T` |
| `T2` |

## Hierarchy

- **GetKeyFunction**

  ↳ [JWTDecryptGetKey](jwt_decrypt.jwtdecryptgetkey.md)

  ↳ [JWTVerifyGetKey](jwt_verify.jwtverifygetkey.md)

  ↳ [CompactDecryptGetKey](jwe_compact_decrypt.compactdecryptgetkey.md)

  ↳ [FlattenedDecryptGetKey](jwe_flattened_decrypt.flatteneddecryptgetkey.md)

  ↳ [GeneralDecryptGetKey](jwe_general_decrypt.generaldecryptgetkey.md)

  ↳ [CompactVerifyGetKey](jws_compact_verify.compactverifygetkey.md)

  ↳ [FlattenedVerifyGetKey](jws_flattened_verify.flattenedverifygetkey.md)

  ↳ [GeneralVerifyGetKey](jws_general_verify.generalverifygetkey.md)

## Callable

### GetKeyFunction

▸ **GetKeyFunction**(`protectedHeader`, `token`): `Promise`<[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

`Promise`<[KeyLike](../types/types.keylike.md)\>

#### Defined in

[types.d.ts:78](https://github.com/panva/jose/blob/v3.13.0/src/types.d.ts#L78)