CryptoKey: type property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
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Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Note: This feature is available in Web Workers.
The read-only type
property of the CryptoKey
interface indicates which kind of key is represented by the object. It can have the following values:
"secret"
: This key is a secret key for use with a symmetric algorithm."private"
: This key is the private half of an asymmetric algorithm'sCryptoKeyPair
."public"
: This key is the public half of an asymmetric algorithm'sCryptoKeyPair
.
Value
One of the following strings: "secret"
, "private"
, or "public"
.
Examples
This function verifies a message using SubtleCrypto.verify()
and a public key given in the parameter. If the key is not a public key, it always returns "invalid"
, as such verification is fundamentally insecure.
js
async function verifyMessage(publicKey) {
const signatureValue = document.querySelector(
".rsassa-pkcs1 .signature-value",
);
signatureValue.classList.remove("valid", "invalid");
let result = false; // By default, it is invalid
if (publicKey.type === "public") {
const encoded = getMessageEncoding();
result = await window.crypto.subtle.verify(
"RSASSA-PKCS1-v1_5",
publicKey,
signature,
encoded,
);
}
signatureValue.classList.add(result ? "valid" : "invalid");
}
Specifications
Specification |
---|
Web Cryptography Level 2 # dom-cryptokey-type |