triam-base/lib/signing.js

Low level triam network support library

"use strict";

exports.sign = sign;
exports.verify = verify;
Object.defineProperty(exports, "__esModule", {
  value: true
});
//  This module provides the signing functionality used by the stellar network
//  The code below may look a little strange... this is because we try to provide
//  the most efficient signing method possible.  First, we try to load the
//  native ed25519 package for node.js environments, and if that fails we
//  fallback to tweetnacl.js

var actualMethods = {};

/**
 * Use this flag to check if fast signing (provided by `ed25519` package) is available.
 * If your app is signing a large number of transaction or verifying a large number
 * of signatures make sure `ed25519` package is installed.
 */
var FastSigning = checkFastSigning();

exports.FastSigning = FastSigning;

function sign(data, secretKey) {
  return actualMethods.sign(data, secretKey);
}

function verify(data, signature, publicKey) {
  return actualMethods.verify(data, signature, publicKey);
}

function checkFastSigning() {
  var ed25519Used;
  // if in node
  if (typeof window === "undefined") {
    (function () {
      // NOTE: we use commonjs style require here because es6 imports
      // can only occur at the top level.  thanks, obama.
      var ed25519 = undefined;
      try {
        ed25519 = require("ed25519");
        ed25519Used = true;
      } catch (err) {
        ed25519Used = false;
      }

      if (ed25519Used) {
        actualMethods.sign = function (data, secretKey) {
          data = new Buffer(data);
          return ed25519.Sign(data, secretKey);
        };

        actualMethods.verify = function (data, signature, publicKey) {
          data = new Buffer(data);
          try {
            return ed25519.Verify(data, signature, publicKey);
          } catch (e) {
            return false;
          }
        };
      }
    })();
  } else {
    ed25519Used = false;
  }

  if (!ed25519Used) {
    (function () {
      // fallback to tweetnacl.js if we're in the browser or
      // if there was a failure installing ed25519
      var nacl = require("tweetnacl");

      actualMethods.sign = function (data, secretKey) {
        data = new Buffer(data);
        data = new Uint8Array(data.toJSON().data);
        secretKey = new Uint8Array(secretKey.toJSON().data);

        var signature = nacl.sign.detached(data, secretKey);

        return new Buffer(signature);
      };

      actualMethods.verify = function (data, signature, publicKey) {
        data = new Buffer(data);
        data = new Uint8Array(data.toJSON().data);
        signature = new Uint8Array(signature.toJSON().data);
        publicKey = new Uint8Array(publicKey.toJSON().data);

        return nacl.sign.detached.verify(data, signature, publicKey);
      };
    })();
  }

  return ed25519Used;
}