rsa.js

  const { publicKey, privateKey } = await crypto.generateKey(
    {
      name: "RSA-OAEP",
      modulusLength: 2048,
      publicExponent: new Uint8Array([0x01, 0x00, 0x01]),
      hash: "SHA-256"
    },
    true,
    ["encrypt", "decrypt"]
  );

  const encryptedText = await crypto
    .encrypt(
      { name: "RSA-OAEP" },
      publicKey,
      stringToArrayBuffer(encodeURI("plaintext"))
    )
    .then(arrayBufferToString);

  const res = await crypto
    .decrypt(
      { name: "RSA-OAEP" },
      privateKey,
      stringToArrayBuffer(encryptedText)
    )
    .then(arrayBufferToString)
    .then(decodeURI);