Encrypt and Decrypt file using web crypto api

encryption.js

async function encryptblob(blob) {

    let iv = crypto.getRandomValues(new Uint8Array(12));
    let algorithm = {
        name: "AES-GCM",
        iv: iv
    }

    let key = await crypto.subtle.generateKey(
        {
            name: "AES-GCM",
            length: 256
        },
        true,
        ["encrypt", "decrypt"]
    );

    let data = await blob.arrayBuffer();

    const result = await crypto.subtle.encrypt(algorithm, key, data);

    let exportedkey =  await crypto.subtle.exportKey("jwk", key)
 
    return [new Blob([result]), iv.toString(), exportedkey]

}

async function decryptblob(encblob, ivdata, exportedkey) {


    let key = await crypto.subtle.importKey(
        "jwk",
        exportedkey,
        { name: "AES-GCM" },
        true,
        ["encrypt", "decrypt"]
    );

    let iv = new Uint8Array(ivdata.split(','))

    let algorithm = {
        name: "AES-GCM",
        iv: iv
    }

    let data = await encblob.arrayBuffer();

    let decryptedData = await crypto.subtle.decrypt(algorithm, key, data);

    return new Blob([decryptedData])


}