import crypto from "crypto";
import utf8 from "utf8";

const key = "YOUR_SECRET_KEY";
const region = "us-east-1";

const date = "11111111";
const service = "ses";
const terminal = "aws4_request";
const message = "SendRawEmail";
const versionInBytes = [0x04];

function sign(key, msg) {
  return crypto
    .createHmac("sha256", Buffer.from(key.map(a => a.charCodeAt(0))))
    .update(utf8.encode(msg))
    .digest("binary")
    .split("");
}

let signature = sign((utf8.encode("AWS4" + key)).split(""), date);
signature = sign(signature, region);
signature = sign(signature, service);
signature = sign(signature, terminal);
signature = sign(signature, message);

const signatureAndVersion = versionInBytes.slice(); //copy of array

signature.forEach(a => signatureAndVersion.push(a.charCodeAt(0)));

const smtpPassword = Buffer.from(signatureAndVersion).toString("base64");
console.log(smtpPassword);