index.js

var crypto = require('crypto');
if (typeof crypto.publicEncrypt !== 'function') {
  crypto = require('./browser');
}
exports.publicEncrypt = crypto.publicEncrypt;
exports.privateDecrypt = crypto.privateDecrypt;

if (typeof crypto.privateEncrypt !== 'function') {
  exports.privateEncrypt = require('./browser').privateEncrypt;
} else {
  exports.privateEncrypt = crypto.privateEncrypt;
}

if (typeof crypto.publicDecrypt !== 'function') {
  exports.publicDecrypt = require('./browser').publicDecrypt;
} else {
  exports.publicDecrypt = crypto.publicDecrypt;
}