[Oracle] Oracle数据加密方法分析

create or replace package test_md5 as
  function fn_getmd5(p_str in varchar2)
  return varchar2;
  function fn_checkuser(p_username in varchar2,p_password in varchar2)
  return number;
end;
create or replace package body test_md5 as
  function fn_getmd5(p_str in varchar2)
  return varchar2 as
  begin
  return DBMS_OBFUSCATION_TOOLKIT.MD5(
    input_string => Upper(p_str)
  );
  end;
  function fn_checkuser(p_username in varchar2,p_password in varchar2)
  return number
  is
  l_password varchar(1000);
  begin
  select password into l_password from test_user
  where upper(username)=upper(p_username) and password=Test_MD5.FN_GetMD5(p_password);
  if l_password is null Then
    return 0;
  else
    return 1;
  end if;
  exception
  when NO_DATA_FOUND then
    return 3;
  end;
end;

Delete Test_User;
Insert Into Test_User Values('A',Test_MD5.FN_GetMD5('aa'));
Insert Into Test_User Values('B',Test_MD5.FN_GetMD5('bb'));
select * from test_user;
Select Test_MD5.FN_CheckUser('a','aa') From Dual;
Select Test_MD5.FN_CheckUser('a','bb') From Dual;
select * from Test_User t where t.password=test_md5.fn_getmd5('aa')