const key = await window.crypto.subtle.generateKey({
  name: 'RSA-OAEP',
  modulusLength: 2048, // can be 1024, 2048, or 4096
  publicExponent: new Uint8Array([0x01, 0x00, 0x01]),
  hash: {name: 'SHA-256'},
 },
  false, // key is extractable?
  ['encrypt', 'decrypt']
);

// returns a keypair object
console.log(key);
console.log(key.publicKey);
console.log(key.privateKey);

const data = 'Je suis Iron Man';

const encrypted = await window.crypto.subtle.encrypt({
    name: 'RSA-OAEP',
  },
  publicKey, // public key of the recipient
  str2ab(data) //ArrayBuffer of data you want to encrypt
);

console.log(encrypted);

const decrypted = await window.crypto.subtle.decrypt({
    name: 'RSA-OAEP',
  },
  privateKey, //Private key of the recipient
  encrypted // ArrayBuffer of the data
);

// Affiche "Je suis Iron Man"
console.log(ab2str(decrypted));