generate or import private and public key pairs, sign and validate

validation.js

async function generateKeyPair() {
    let algoritm = {
        name: "ECDSA",
        namedCurve: "P-521"
    };
    let exportable = true;
    let usage = ["sign", "verify"];
    return await window.crypto.subtle.generateKey(algoritm, exportable, usage);
}

async function exportKeys(key) {
    let format = "jwk";
    let publicKey = await window.crypto.subtle.exportKey(format, key.publicKey);
    let privateKey = await window.crypto.subtle.exportKey(format, key.privateKey);
    return {
        publicKey,
        privateKey
    };
}

async function importPrivateKey(privateKey) {
    let format = "jwk";
    let algoritm = {
        name: "ECDSA",
        namedCurve: "P-521"
    };
    let exportable = true;
    let usage = ["sign"];
    return await window.crypto.subtle.importKey(format, privateKey, algoritm, exportable, usage);
}

async function importPublicKey(publicKey) {
    let format = "jwk";
    let algoritm = {
        name: "ECDSA",
        namedCurve: "P-521"
    };
    let exportable = true;
    let usage = ["verify"];
    return await window.crypto.subtle.importKey(format, publicKey, algoritm, exportable, usage);
}

async function signMessage(privateKey, inputData) {
    let algoritm = {
        name: "ECDSA",
        hash: {
            name: "SHA-512"
        }
    };
    let encodedData = new TextEncoder().encode(inputData);
    return await window.crypto.subtle.sign(algoritm, privateKey, encodedData);
}

async function verifyMessage(publicKey, signature, inputData) {
    let algoritm = {
        name: "ECDSA",
        hash: {
            name: "SHA-512"
        },
    };
    let encodedData = new TextEncoder().encode(inputData);
    return await window.crypto.subtle.verify(algoritm, publicKey, signature, encodedData);
}