ladybird/Tests/LibWeb/Text/input/Crypto/SubtleCrypto-sign.html

<script src="../include.js"></script>
<script>
    asyncTest(async done => {
        const encoder = new TextEncoder();
        const message = "Hello friends";
        const encoded_message = encoder.encode(message);

        const key_algorithm = {
            name: "ECDSA",
            namedCurve: "P-384",
        };
        const extractable = true;
        const usages = ["sign", "verify"];
        const key = await window.crypto.subtle.generateKey(key_algorithm, extractable, usages);

        const signature_algorithm = {
            name: "ECDSA",
            hash: { name: "SHA-384" },
        };
        const signature = await window.crypto.subtle.sign(
            signature_algorithm,
            key.privateKey,
            encoded_message
        );

        const data_view = String.fromCharCode.apply(null, new Uint8Array(signature));

        println(`Signed OK ... [${signature.byteLength} bytes total] (${data_view})`);

        done();
    });
</script>