NodeJS example code to generate a RFC 2104 compliant HMAC

core.js

var crypto = require("crypto");
/**
 * Get the signature/digest of a supplied input string
 * @param data [Required] The String to encode
 * @param awsSecretKey [Required] Secret key shared with Amazon
 * @param algorithm [Optional] Encryption algorithm, defaults to sha256
 * @param encoding [Optional] The output encoding. Default to base64
 * @returns Str with encoded digest of the input string
 */
function generateHmac (data, awsSecretKey, algorithm, encoding) {
  encoding = encoding || "base64";
  algorithm = algorithm || "sha256";
  return crypto.createHmac(algorithm, awsSecretKey).update(data).digest(encoding);
}
var d = new Date();
var rfc2104Hmac = generateHmac(d.toUTCString(), "awsSecretKey value");
 
console.log(rfc2104Hmac);

example.js

var request = require("request");
var crypto = require("crypto");
var d = new Date().toUTCString();
var config = {
  awsAccessKeyId : "AWS key",
  awsSecretKey   : "AWS Secret"
}

// Options for the http POST request
var options = {
  "headers" : {
    "Date"   : d, // Must pass the Date header as well as the X-Amzn-Authorization header
    "X-Amzn-Authorization" : "AWS3-HTTPS AWSAccessKeyId=" + config.awsAccessKeyId +
      ",Algorithm=HMACSHA256,Signature=" + generateHmac(d, config.awsSecretKey)
  },
  "form"    : {
  }
};


function generateHmac (data, awsSecretKey, algorithm, encoding) {
  encoding = encoding || "base64";
  algorithm = algorithm || "sha256";
  return crypto.createHmac(algorithm, awsSecretKey).update(data).digest(encoding);
}


request.post(
  "https://email.us-east-1.amazonaws.com/",
  options,
  function (error, response, body) {
    console.log(response.statusCode, body);
  }
);