diff --git a/node_modules/react-native-aes-crypto/android/src/main/java/com/tectiv3/aes/RCTAes.java b/node_modules/react-native-aes-crypto/android/src/main/java/com/tectiv3/aes/RCTAes.java
index 6843507..86ae4c6 100755
--- a/node_modules/react-native-aes-crypto/android/src/main/java/com/tectiv3/aes/RCTAes.java
+++ b/node_modules/react-native-aes-crypto/android/src/main/java/com/tectiv3/aes/RCTAes.java
@@ -81,6 +81,14 @@ public class RCTAes extends ReactContextBaseJavaModule {
         } catch (Exception e) {
             promise.reject("-1", e.getMessage());
         }
+	}
+	
+	@ReactMethod(isBlockingSynchronousMethod = true)
+	public String pbkdf2Sync(String pwd, String salt, Integer cost, Integer length)
+	throws NoSuchAlgorithmException, InvalidKeySpecException, UnsupportedEncodingException
+	{
+        	String strs = pbkdf2(pwd, salt, cost, length);
+			return strs;
     }
 
     @ReactMethod
diff --git a/node_modules/react-native-aes-crypto/ios/RCTAes/RCTAes.m b/node_modules/react-native-aes-crypto/ios/RCTAes/RCTAes.m
index ded93b6..6bc1b0b 100755
--- a/node_modules/react-native-aes-crypto/ios/RCTAes/RCTAes.m
+++ b/node_modules/react-native-aes-crypto/ios/RCTAes/RCTAes.m
@@ -51,6 +51,13 @@ @implementation RCTAes
     }
 }
 
+RCT_EXPORT_BLOCKING_SYNCHRONOUS_METHOD(pbkdf2Sync:(NSString *)password salt:(NSString *)salt
+                  cost:(NSInteger)cost length:(NSInteger)length){
+	
+	return [AesCrypt pbkdf2:password salt:salt cost:cost length:length];
+}
+
+
 RCT_EXPORT_METHOD(hmac256:(NSString *)base64 key:(NSString *)key
                   resolver:(RCTPromiseResolveBlock)resolve
                   rejecter:(RCTPromiseRejectBlock)reject) {