subtle.exportKey(format, key)

• format <string> 必须是 'raw'、'pkcs8'、'spki'、'jwk'、'raw-secret'³、'raw-public'³ 或 'raw-seed'³ 之一。

  ¥format <string> Must be one of 'raw', 'pkcs8', 'spki', 'jwk', 'raw-secret'³, 'raw-public'³, or 'raw-seed'³.

• key <CryptoKey>

• 返回：<Promise> 成功后使用 <ArrayBuffer> | <Object> 完成。

  ¥Returns: <Promise> Fulfills with an <ArrayBuffer> | <Object> upon success.

如果支持，将给定的密钥导出为指定的格式。

¥Exports the given key into the specified format, if supported.

如果 <CryptoKey> 不可提取，则返回的 promise 将被拒绝。

¥If the <CryptoKey> is not extractable, the returned promise will reject.

当 format 为 'pkcs8' 或 'spki' 且导出成功时，返回的 promise 将使用包含导出密钥数据的 <ArrayBuffer> 进行解析。

¥When format is either 'pkcs8' or 'spki' and the export is successful, the returned promise will be resolved with an <ArrayBuffer> containing the exported key data.

当 format 为 'jwk' 且导出成功时，返回的 promise 将使用符合 JSON 网络密钥 规范的 JavaScript 对象解析。

¥When format is 'jwk' and the export is successful, the returned promise will be resolved with a JavaScript object conforming to the JSON Web Key specification.

支持的密钥算法	'spki'	'pkcs8'	'jwk'	'raw'	'raw-secret'	'raw-public'	'raw-seed'
'AES-CBC'			✔	✔	✔
'AES-CTR'			✔	✔	✔
'AES-GCM'			✔	✔	✔
'AES-KW'			✔	✔	✔
'AES-OCB'[^modern-algos]			✔		✔
'ChaCha20-Poly1305'[^modern-algos]			✔		✔
'ECDH'	✔	✔	✔	✔		✔
'ECDSA'	✔	✔	✔	✔		✔
'Ed25519'	✔	✔	✔	✔		✔
'Ed448'[^secure-curves]	✔	✔	✔	✔		✔
'HMAC'			✔	✔	✔
'ML-DSA-44'[^modern-algos]	✔	✔	✔			✔	✔
'ML-DSA-65'[^modern-algos]	✔	✔	✔			✔	✔
'ML-DSA-87'[^modern-algos]	✔	✔	✔			✔	✔
'ML-KEM-512'[^modern-algos]	✔	✔				✔	✔
'ML-KEM-768'[^modern-algos]	✔	✔				✔	✔
'ML-KEM-1024'[^modern-algos]	✔	✔				✔	✔
'RSA-OAEP'	✔	✔	✔
'RSA-PSS'	✔	✔	✔
'RSASSA-PKCS1-v1_5'	✔	✔	✔