SubtleCrypto.importKey() method returns a
Promise of the
CryptoKey generated from the data given in parameters.
var result = crypto
.subtle.importKey(format, keyData, algo, extractable, usages);
format is an enumerated value describing the data format of the key to imported. It can be one of the following:
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.
The promise is rejected when one of the following exceptions is encountered:
keyUsages is empty but the unwrapped key is of type
TypeError when trying to use an invalid format or if the
keyData is not suited for that format.
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