The following certificate (it's publicly available, don't worry about it) was generated by Microsoft in order to validate the authenticity of JWT generated tokens
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
I'd like to know how it would be possible to import it as a key with WebCrypto (not interested in other libraries ATM), so far I've had no luck
The attempted code has been
// Extracted from WebCrypto examples
function stringToArrayBuffer(string) {
const buf = new ArrayBuffer(string.length);
const bufView = new Uint8Array(buf);
for (let i = 0, strLen = string.length; i < strLen; i++) {
bufView[i] = string.charCodeAt(i);
}
return buf;
}
const key = await crypto.subtle.importKey(
"spki",
stringToArrayBuffer(atob(the_certificate_without_headers)),
{
name: "RSASSA-PKCS1-v1_5",
hash: "SHA-256",
},
true,
["verify"],
);
The above fails with
DOMException: unexpected ASN.1 DER tag: expected OBJECT IDENTIFIER, got CONTEXT-SPECIFIC [0] (constructed) at DER byte 8