PL/SQL :: AES128 Encryption Compatible With Oracle  And C#

I am trying to have an encryption logic written in Pl/SQL that could decrypt the value which is encrypted in Dot Net, using AES128 algorithm. Everytime when i try to have the decryption done, i lands up in one or the other error message. Below is the code snippet which i use. create or replace

FUNCTION decryptAES (EncryptedText IN VARCHAR2,EncKey IN VARCHAR2) RETURN VARCHAR2 DETERMINISTIC  IS   key_bytes_raw  RAW (2048);  l_ decrypted_raw   RAW (2048);  encryption_type    PLS_INTEGER := DBMS_CRYPTO.ENCRYPT_AES128; BEGIN  key_bytes_ raw:= UTL_RAW. CAST_TO_ RAW (EncKey);  l_decrypted_raw := dbms_crypto.decrypt  (src =>utl_raw.cast_to_raw(EncryptedText),  typ => encryption_type,   key => key_bytes_raw  );          RETURN (UTL_RAW.CAST_TO_VARCHAR2 (l_decrypted_raw));   END decryptAES.