CREATE OR REPLACE FUNCTION ENCRYPT_AES (V_STR IN VARCHAR2)
    RETURN VARCHAR2 
AS 
    V_KEY_RAW      RAW(32);
    V_IV_RAW	   RAW(16);
    V_STR_RAW      RAW (2000);
    V_RETURN_STR   VARCHAR2 (2000);
    V_TYPE         PLS_INTEGER;
BEGIN 

    V_KEY_RAW := Hextoraw('69ebfd1ab33b1d56142b61921bb081c2ef41fec799d50f50e0884daadab0078c');
    V_IV_RAW := Hextoraw('351945b97f988451da9696c507ab0593');

    V_STR_RAW := UTL_I18N.STRING_TO_RAW(V_STR, 'GBK');

    V_TYPE := DBMS_CRYPTO.ENCRYPT_AES256;


    V_STR_RAW := DBMS_CRYPTO.ENCRYPT ( V_STR_RAW, V_TYPE, V_KEY_RAW, V_IV_RAW);

    V_RETURN_STR := RAWTOHEX (V_STR_RAW);
    RETURN V_RETURN_STR; 
END;

declare
begin
ENCRYPT_AES('abcd');
end;
执行失败，失败原因：
[-6803]：非法的参数数据
-6803: DBMS_CRYPTO.ENCRYPT line 111
-6803: ENCRYPT_AES line 19