SubtleCrypto.importKey

The SubtleCrypto.importKey() method returns a Promise of the CryptoKey generated from the data given in parameters.

Syntax

var result = crypto.subtle.importKey(format, keyData, algo, extractable, usages);

Parameters

• format is an enumerated value describing the data format of the key to imported. It can be one of the following:
  • "raw", the key as an array of bytes, usually a secret key.
  • "pkcs8" a private key, in the IETF Public Key-Cryptographic Standard Encryption #8.
  • "spki", a public key in DER encoding of the SubjectPublicKeyInfo structure from RFC 5280.
  • "jwk", the key in the JSON Web Key format.
• keyData is an ArrayBuffer or a JSONWebKey containing the key in the given format.
• algo is a dictionary object defining the algorithm that was used to generate the key being imported.
• extractable is a Boolean indicating if the key can be extracted from the CryptoKey object at a later stage.
• usages is an Array indicating what can be done with the key. Possible values of the array are:
  • "encrypt", allowing the key to be used for encrypting messages.
  • "decrypt", allowing the key to be used for decrypting messages.
  • "sign", allowing the key to be used for signing messages.
  • "verify", allowing the key to be used for verifying the signature of messages.
  • "deriveKey", allowing the key to be used as a base key when deriving a new key.
  • "deriveBits", allowing the key to be used as a base key when deriving bits of data for use in cryptographic primitives.
  • "wrapKey", allowing the key to wrap a symmetric key for usage (transfer, storage) in unsecure environments.
  • "unwrapKey", allowing the key to unwrap a symmetric key for usage (transfer, storage) in unsecure environments.

Return value

• result is a Promise that returns the generated CryptoKey.

Exceptions

The promise is rejected when one of the following exceptions is encountered:

• SyntaxError when keyUsages is empty but the unwrapped key is of type "secret" or "private".
• TypeError when trying to use an invalid format or if the keyData is not suited for that format.

Specifications

Browser compatibility

See also

• Crypto and Crypto.subtle.
• SubtleCrypto, the interface it belongs to.
• Examples