oracle md5 加密函数

源代码：CREATE OR REPLACE FUNCTION fn_md5 (input_string IN VARCHAR2)
    RETURN VARCHAR2
IS
    raw_input                        RAW (128)
                                           := UTL_RAW.cast_to_raw (input_string);
    decrypted_raw                    RAW (2048);
    error_in_input_buffer_length     EXCEPTION;
BEGIN
    DBMS_OBFUSCATION_TOOLKIT.md5 (input => raw_input,
                                  checksum => decrypted_raw
                                 );
    RETURN LOWER (RAWTOHEX (decrypted_raw));
END;
/


相同的
pl/sql版 CREATE OR REPLACE function md5(input_string VARCHAR2) return varchar2
IS
raw_input RAW(128) := UTL_RAW.CAST_TO_RAW(input_string);
decrypted_raw RAW(2048);
error_in_input_buffer_length EXCEPTION;
BEGIN
sys.dbms_obfuscation_toolkit.MD5(input => raw_input, checksum => decrypted_raw);
return lower(rawtohex(decrypted_raw));
END;