Error converting DER to JWK

[chutcher01]

I am getting an error when converting an elliptic curve DER to JWK. I have been able to convert this same key in swift and java.

Error: FailedToDecodeKey

The code

const publicKeyObject = new jscu.Key('der', new Uint8Array(Buffer.from(key, 'base64')));
const key = await publicKeyObject.export('jwk');

The DER

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

[junkurihara]

Hey @chutcher01

Please let me know more information on the binary. If it works in swift and java, please let me know what APIs you used.

Also, this Base64-encoded key looks too long as an EC public key, and I guess this is NOT the one of RFC5480 formatted key but an X509 certificate. In fact, by converting the binary to UTF-8, I can see it contains urls and text strings. If my expectation is true, you need first extract SPKI part (i.e., DER encoded public key part) of X509 and then put it to jscu.