Use RSA-OAEP. https://github.com/diafygi/webcrypto-examples#rsa-oaep---encrypt

[NPXI] @miniflare/tre not available locally. Attempting to use npx to install temporarily.
[NPXI] Installing... (npx --prefer-offline -y -p @miniflare/tre@3.0.0-next.12)

[NPXI] @miniflare/tre not available locally. Attempting to use npx to install temporarily.
[NPXI] Installing... (npx --prefer-offline -y -p @miniflare/tre@3.0.0-next.12)

yarn add -D @miniflare/tre@3.0.0-next.12

yarn add -D @miniflare/tre@3.0.0-next.12

export default {
  fetch(req) {
    const username = "user";
    const password = "passwd";
    const b64 = btoa(`${username}:${password}`);

    return fetch("https://httpbin.org/basic-auth/user/passwd", {
      headers: {
        Authorization: `Basic ${b64}`,
      },
    });
  },
};

export default {
  fetch(req) {
    const username = "user";
    const password = "passwd";
    const b64 = btoa(`${username}:${password}`);

    return fetch("https://httpbin.org/basic-auth/user/passwd", {
      headers: {
        Authorization: `Basic ${b64}`,
      },
    });
  },
};