DECLARE 
 
  --l_rw_encrypted_string raw(2000):='6249B8F6F9B594EB8FC72DA152A40ADC5501C55969AAFDA6600437C9518CBBC0F372858E0ADE212EC1FA67FE2EB7ADC8'; 
  l_rw_encrypted_string raw(2000):='nowi234'; 
   
  aha EXCEPTION; 
  PRAGMA EXCEPTION_INIT(aha, -06502); 
 
  
 
  l_rw_encryption_key raw(32):='6AA28EBC54ECDBCE68791F14AE1BA6901133365DBF9CF5E16C1A55B3E02F78FD'; 
 
  l_pi_encryption_type pls_integer:=DBMS_CRYPTO.ENCRYPT_AES256+ DBMS_CRYPTO.CHAIN_CBC+ DBMS_CRYPTO.PAD_PKCS5; 
 
 
  l_rw_decrypted_string raw(2000); 
 
  l_rw_output_hash_value raw(32); 
 
  
 
BEGIN 
 
  l_rw_decrypted_string := DBMS_CRYPTO.DECRYPT(l_rw_encrypted_string, l_pi_encryption_type, l_rw_encryption_key); 
 
  dbms_output.put_line('Decrypted value=> '||UTL_I18N.RAW_TO_CHAR(l_rw_decrypted_string, 'AL32UTF8')); 
  EXCEPTION 
			WHEN aha THEN 
				RAISE_APPLICATION_ERROR(-20005,'blah ',TRUE); 
 
  
 
END;