public enum KeyUsage

What a KeyHandle is allowed to do.

Usages are fixed when a handle is created and are not widened afterwards. A handle created to seal records cannot be talked into signing, which matters because the two operations under one key is a classic way to turn a confidentiality primitive into an oracle. Web Crypto enforces the same restriction on a CryptoKey, and this mirrors it so a port cannot be more permissive than the browser is.

Enum constants

`SEAL`	Authenticated encryption: `KeyHandle.seal`.
`OPEN`	Authenticated decryption: `KeyHandle.open`.
`MAC`	Message authentication: `KeyHandle.mac`.
`VERIFY_MAC`	Verification of a tag produced by `MAC`.
`WRAP`	Wrapping another key.
`UNWRAP`	Unwrapping a key wrapped under `WRAP`.

Methods

`public static` `KeyUsage[] values()`
`public static` `KeyUsage valueOf(String name)`

Inherited methods

From Enum

clone, setEnumValues, getEnumValues, valueOf, equals, hashCode, toString, compareTo, name, ordinal, getDeclaringClass

From Object

getClass, notify, notifyAll, wait, wait, wait

Enum constant details

SEAL

SEAL

Authenticated encryption: KeyHandle.seal.

OPEN

OPEN

Authenticated decryption: KeyHandle.open.

MAC

MAC

Message authentication: KeyHandle.mac.

VERIFY_MAC

VERIFY_MAC

Verification of a tag produced by MAC.

WRAP

WRAP

Wrapping another key. Separate from SEAL so a key that only protects other keys cannot be pointed at application data, and the reverse.

UNWRAP

UNWRAP

Unwrapping a key wrapped under WRAP.

Method details

values

public static KeyUsage[] values()

valueOf

public static KeyUsage valueOf(String name)