@nhz.io/hmac-sha1/index.js

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// # HMAC-SHA1 digest
var crypto, digest, hmacSha1;

crypto = require('crypto');

// Curry `secret` to allow reuse
hmacSha1 = function(secret) {
  return function(message) {
    var hmac;
    hmac = crypto.createHmac('sha1', secret);
    hmac.update(message, 'utf8');
    return hmac.digest('hex');
  };
};

digest = function(secret, message) {
  var hmac;
  // Start curried
  hmac = hmacSha1(secret);
  // Complete invocation if possible
  if (message) {
    return hmac(message);
  } else {
    return hmac;
  }
};

// ## Exports
module.exports = digest;