diff --git a/lib/crypto.browser.js b/lib/crypto-platform.browser.js
similarity index 90%
rename from lib/crypto.browser.js
rename to lib/crypto-platform.browser.js
index 8052a8e..d6bf688 100644
--- a/lib/crypto.browser.js
+++ b/lib/crypto-platform.browser.js
@@ -1,11 +1,9 @@
 /**
- * Browser version of the crypto for Bitmessage JS implementation.
+ * Browser Bitmessage crypto implementation.
  *
  * Documentation: <http://www.w3.org/TR/WebCryptoAPI/>
  * Browsers support: <http://caniuse.com/#feat=cryptography>
  * Blink implementation details: <https://sites.google.com/a/chromium.org/dev/blink/webcrypto>
- *
- * @module bitmessage/crypto.browser
  */
 
 "use strict";
diff --git a/lib/crypto-platform.js b/lib/crypto-platform.js
new file mode 100644
index 0000000..47eaf49
--- /dev/null
+++ b/lib/crypto-platform.js
@@ -0,0 +1,27 @@
+/**
+ * Node.js Bitmessage crypto implementation.
+ * @module bitmessage/crypto-platform
+ */
+
+"use strict";
+
+require("es6-promise").polyfill();
+var crypto = require("crypto");
+
+exports.sha512 = function(buf) {
+  var hash = crypto.createHash("sha512");
+  hash.update(buf);
+  return Promise.resolve(hash.digest());
+};
+
+exports.sha256 = function(buf) {
+  var hash = crypto.createHash("sha256");
+  hash.update(buf);
+  return Promise.resolve(hash.digest());
+};
+
+exports.ripemd160 = function(buf) {
+  var hash = crypto.createHash("ripemd160");
+  hash.update(buf);
+  return Promise.resolve(hash.digest());
+};
diff --git a/lib/crypto.js b/lib/crypto.js
index c8b5154..c77f550 100644
--- a/lib/crypto.js
+++ b/lib/crypto.js
@@ -1,27 +1,12 @@
 /**
- * Node.js version of the crypto for Bitmessage JS implementation.
+ * Isomorphic Bitmessage crypto module. Reexport platform-specific
+ * functions and also export some common routines.
  * @module bitmessage/crypto
  */
 
 "use strict";
 
-require("es6-promise").polyfill();
-var crypto = require("crypto");
-
-exports.sha512 = function(buf) {
-  var hash = crypto.createHash("sha512");
-  hash.update(buf);
-  return Promise.resolve(hash.digest());
-};
-
-exports.sha256 = function(buf) {
-  var hash = crypto.createHash("sha256");
-  hash.update(buf);
-  return Promise.resolve(hash.digest());
-};
-
-exports.ripemd160 = function(buf) {
-  var hash = crypto.createHash("ripemd160");
-  hash.update(buf);
-  return Promise.resolve(hash.digest());
-};
+var cryptoPlatform = require("./crypto-platform");
+Object.keys(cryptoPlatform).forEach(function(key) {
+  exports[key] = cryptoPlatform[key];
+});
diff --git a/package.json b/package.json
index 16547e1..bb13879 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "main": "./lib/index.js",
   "browser": {
     "int64-native": "node-int64",
-    "./lib/crypto.js": "./lib/crypto.browser.js"
+    "./lib/crypto-platform.js": "./lib/crypto-platform.browser.js"
   },
   "scripts": {
     "test": "mocha && xvfb-run -a karma start && jshint .",