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Represents a symmetric key used for cryptographic operations. Symmetric keys are typically generated using a . This class also provides methods to export and check the properties of symmetric keys.

Extends

  • BaseCryptoClass

Constructors

new SymmetricKey()

new SymmetricKey(): SymmetricKey

Returns

SymmetricKey

Methods

exportRaw()

exportRaw(): Promise<ArrayBuffer> Export the symmetric key as raw bytes. This method should only be called on keys that are marked as exportable.

Throws

  • If the key is not exportable.

Returns

Promise<ArrayBuffer> Promise A promise that resolves to the raw key bytes.

hasPurpose()

hasPurpose(purpose: KeyPurpose): boolean Check if a particular purpose is enabled for this key.

Parameters

purpose
KeyPurpose A key purpose to check.

Throws

  • If the argument is not a valid purpose.

Returns

boolean boolean true if the purpose is enabled for this key, false otherwise.
Last modified on July 22, 2026