diff --git a/src/schemes/oaep.js b/src/schemes/oaep.js
index 87bb8ea..2d3db6c 100644
--- a/src/schemes/oaep.js
+++ b/src/schemes/oaep.js
@@ -48,10 +48,10 @@ module.exports.eme_oaep_mgf1 = function (seed, maskLength, hashFunction) {
     var c = new Buffer(4);
     for (var i = 0; i < count; ++i) {
         var hash = crypt.createHash(hashFunction);
-        hash.write(seed);
+        hash.update(seed);
         c.writeUInt32BE(i, 0);
-        hash.end(c);
-        hash.read().copy(T, i * hLen);
+        hash.update(c);
+        hash.digest().copy(T, i * hLen);
     }
     return T.slice(0, maskLength);
 };
@@ -177,4 +177,4 @@ module.exports.makeScheme = function (key, options) {
     };
 
     return new Scheme(key, options);
-};
\ No newline at end of file
+};