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exportKey

The exportKey() method takes a CryptoKey object as input and exports it in an external, portable format.

Note that for a key to be exportable, it must have been created with the extractable flag set to true.

Usage

exportKey(format, key)

Parameters

NameTypeDescription
formatstringDefines the data format the key should be exported in. Currently supported formats: raw.
keyCryptoKeyThe key to export.

Return Value

A Promise that resolves to a new ArrayBuffer containing the key.

Throws

TypeDescription
InvalidAccessErrorRaised when trying to export a non-extractable key.
NotSupportedErrorRaised when trying to export in an unknown format.
TypeErrorRaised when trying to use an invalid format.

Example

JavaScript 
import { crypto } from 'k6/experimental/webcrypto';

export default async function () {
  /**
   * Generate a symmetric key using the AES-CBC algorithm.
   */
  const generatedKey = await crypto.subtle.generateKey(
    {
      name: 'AES-CBC',
      length: '256',
    },
    true,
    ['encrypt', 'decrypt']
  );

  /**
   * Export the key in raw format.
   */
  const exportedKey = await crypto.subtle.exportKey('raw', generatedKey);

  /**
   * Reimport the key in raw format to verfiy its integrity.
   */
  const importedKey = await crypto.subtle.importKey('raw', exportedKey, 'AES-CBC', true, [
    'encrypt',
    'decrypt',
  ]);

  console.log(JSON.stringify(importedKey));
}