The CryptoKey interface of the Web Crypto API represents a cryptographic key obtained from one of the SubtleCrypto methods generateKey(), deriveKey(), importKey(), or unwrapKey().

For security reasons, the CryptoKey interface can only be used in a secure context.

CryptoKey.type Read only

The type of key the object represents. It may take one of the following values: "secret", "private" or "public".

CryptoKey.extractable Read only

A boolean value indicating whether or not the key may be extracted using SubtleCrypto.exportKey() or SubtleCrypto.wrapKey().

CryptoKey.algorithm Read only

An object describing the algorithm for which this key can be used and any associated extra parameters.

CryptoKey.usages Read only

An Array of strings, indicating what can be done with the key. Possible values for array elements are "encrypt", "decrypt", "sign", "verify", "deriveKey", "deriveBits", "wrapKey", and "unwrapKey".

The examples for SubtleCrypto methods often use CryptoKey objects. For example:

• SubtleCrypto.generateKey()
• SubtleCrypto.deriveKey()
• SubtleCrypto.importKey()
• SubtleCrypto.exportKey()
• SubtleCrypto.wrapKey()
• SubtleCrypto.unwrapKey()
• SubtleCrypto.encrypt()
• SubtleCrypto.decrypt()
• SubtleCrypto.sign()
• SubtleCrypto.verify()

• Web Crypto API
• Web security
• Privacy, permissions, and information security
• Crypto and Crypto.subtle.