如何在Oracle中以普通用户身份运行dbms_crypto函数？

我在Oracle中使用DBMS_crypto.hash()函数时遇到问题.

我使用sqlplus作为“sys / passwd as sysdba”连接到数据库服务器,
然后我安装了DBMS_crypto包：

@/home/Oracle/app/Oracle/product/11.2.0/dbhome_1/rdbms/admin/dbmsobtk.sql
@/home/Oracle/app/Oracle/product/11.2.0/dbhome_1/rdbms/admin/prvtobtk.plb
Grant execute on DBMS_crypto to PUBLIC;
Grant execute on DBMS_sqlhash to PUBLIC;
Grant execute on DBMS_obfuscation_toolkit to PUBLIC;
Grant execute on DBMS_obfuscation_toolkit_ffi to PUBLIC;
Grant execute on DBMS_crypto_ffi to PUBLIC;

一切看起来都不错,所以我测试了hash()函数：

sql> SELEct DBMS_crypto.hash(utl_raw.cast_to_raw('zorg'),3) from dual;

DBMS_CRYPTO.HASH(UTL_RAW.CAST_TO_RAW('ZORG'),3)
--------------------------------------------------------------------------------
60C440F9954CA4744204cda9CC93567059C1EC82

我作为普通用户断开并连接到该数据库,但后来我收到错误：

sql> SELEct DBMS_crypto.hash(utl_raw.cast_to_raw('zorg'),3) from dual;
SELEct DBMS_crypto.hash(utl_raw.cast_to_raw('zorg'),3) from dual
             *
ERROR at line 1:
ORA-06521: pl/sql: Error mapPing function
ORA-06512: at "MN.DBMS_CRYPTO_FFI",line 131
ORA-06512: at "MN.DBMS_CRYPTO",line 72

为什么我不能像普通用户一样使用此功能？如何让其他用户使用它？

我合作：

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

sqlplus / as sysdba

@/home/Oracle/app/Oracle/product/11.2.0/dbhome_1/rdbms/admin/dbmsobtk.sql
@/home/Oracle/app/Oracle/product/11.2.0/dbhome_1/rdbms/admin/prvtobtk.plb