diff --git a/crypto_onetimeauth.js b/crypto_onetimeauth.js
new file mode 100644
index 0000000..a7b4d60
--- /dev/null
+++ b/crypto_onetimeauth.js
@@ -0,0 +1,20 @@
+const poly1305 = require('./poly1305')
+const { crypto_verify_16 } = require('./crypto_verify')
+
+module.exports = {
+  crypto_onetimeauth,
+  crypto_onetimeauth_verify
+}
+
+function crypto_onetimeauth(out, outpos, m, mpos, n, k) {
+  var s = new poly1305(k);
+  s.update(m, mpos, n);
+  s.finish(out, outpos);
+  return 0;
+}
+
+function crypto_onetimeauth_verify(h, hpos, m, mpos, n, k) {
+  var x = new Uint8Array(16);
+  crypto_onetimeauth(x,0,m,mpos,n,k);
+  return crypto_verify_16(h,hpos,x,0);
+}
diff --git a/index.js b/index.js
index d6157fd..a0e7524 100644
--- a/index.js
+++ b/index.js
@@ -14,20 +14,6 @@ var sodium = module.exports
 var randombytes = require('./randombytes').randombytes
 
 
-function crypto_onetimeauth(out, outpos, m, mpos, n, k) {
-  var s = new poly1305(k);
-  s.update(m, mpos, n);
-  s.finish(out, outpos);
-  return 0;
-}
-
-function crypto_onetimeauth_verify(h, hpos, m, mpos, n, k) {
-  var x = new Uint8Array(16);
-  crypto_onetimeauth(x,0,m,mpos,n,k);
-  return crypto_verify_16(h,hpos,x,0);
-}
-
-
 
 
 function crypto_box_keypair(pk, sk) {