Failed to call DBMS_CRYPTO.ENCRYPT / DECRYPT

Question

I tried to use Oracle 11gR2 DBMS_CRYPTO to perform AES256 encryption/decryption. From the Oracle Ref., it specifies "Security Model - Oracle Database installs this package in the SYS schema. You can then grant package access to existing users and roles as needed." So requested DBA to grant EXECUTE privilege for the SYS.DBMS_CRYPTO.
I successfully run the SQL "select DBMS_CRYPTO.RANDOMBYTES(64) from dual;", but when I tried to implement Package body. The compiler prompted errors: PLS-00201: identified 'DBMS_CRYPTO' must be declared.
Please kindly help and advise. Thanks!
Src code of the package body:
CREATE OR REPLACE PACKAGE BODY PKG_TOOLKIT AS
     g_encryption_type PLS_INTEGER := DBMS_CRYPTO.ENCRYPT_AES256 + DBMS_CRYPTO.CHAIN_CBC     + DBMS_CRYPTO.PAD_PKCS5;
FUNCTION encrypt (p_text IN VARCHAR2) RETURN RAW IS
     l_key VARCHAR2(512);
l_text VARCHAR2(32767) := p_text;
l_encrypted RAW(32767);          
BEGIN
getKey(l_key);
          l_encrypted := DBMS_CRYPTO.ENCRYPT(src => UTL_I18N.STRING_TO_RAW(l_text, 'AL32UTF8'),
typ => g_encryption_type,
key => UTL_I18N.STRING_TO_RAW(l_key, 'AL32UTF8'));
RETURN l_encrypted;
END;
FUNCTION decrypt (p_raw IN RAW) RETURN VARCHAR2 IS
     l_key VARCHAR2(512);
l_decrypted VARCHAR2(32767);
BEGIN
getKey(l_key);
          l_decrypted := DBMS_CRYPTO.DECRYPT(src => p_raw,
typ => g_encryption_type,
key => UTL_I18N.STRING_TO_RAW(l_key, 'AL32UTF8'));
RETURN RTrim(UTL_I18N.RAW_TO_CHAR(l_decrypted, 'AL32UTF8'));
END;
END PKG_TOOLKIT;
/

Answer 1

From the Package DBMS_CRYPTO -> Grants, I found there is a privilege "EXECUTE" granted to grantee "ORADEV1". "ORADEV1" is the login ID I'm using to connect to Oracle. Can I tell whether the DBA is granting the privilege to this id or it's role thru Oracle Developer?