一. Wrap 說明
官網的說明如下：
A PL/SQL Source Text Wrapping
http://download.oracle.com/docs/cd/E11882_01/appdev.112/e17126/wrap.htm#LNPLS1744
You can wrap the PL/SQL source text for any of these stored PL/SQL units, thereby preventing anyone from displaying or editing that text:
（1）Package specification
（2）Package body
（3）Type specification
（4）Type body
（5）Function
（6）Procedure
A file containing wrapped PL/SQL source text is called a wrapped file. Awrapped file can be moved, backed up, or processed by SQL*Plus or the Importand Export utilities.
To produce a wrapped file, use either the PL/SQL Wrapper utility or a DBMS_DDL subprogram.The PL/SQL Wrapper utility wraps the source text of every wrappable PL/SQL unitcreated by a specified SQL file. The DBMS_DDL subprograms wrap thesource text of single dynamically generated wrappable PL/SQL units.
Both the PL/SQL Wrapper utility and DBMS_DDL subprograms detecttokenization errors (for example, runaway strings), but not syntax or semanticerrors (for example, nonexistent tables or views).
Wrapped files are upward-compatible between Oracle Database releases. For example, youcan load files produced by the V8.1.5 PL/SQL Wrapper utility into a V8.1.6 OracleDatabase.
itpub上有篇文章提到了wrap 加密的原理：
From:http://space.itpub.net/12932950/viewspace-619808
Oracle加密的原理就是先對源碼進行lz壓縮lzstr，然後對壓縮數據進行SHA-1運算得到40位的加密串shstr，然後將加密串與壓縮串拼接得到shstr+lzstr，然後對拼接後的字符串進行Oracle雙字符轉換（轉換表）。最後將轉換後的字符串進行base64編碼，最終得到wrap的加密串。
The default file extension for input_file is sql. The default nameof output_file is input_file.plb. Therefore, these commands are equivalent:
wrapiname=/mydir/myfile
wrapiname=/mydir/myfile.sql oname=/mydir/myfile.plb
Thisexample specifies a different file extension for input_file and adifferent name for output_file:
wrapiname=/mydir/myfile.src oname=/yourdir/yourfile.out
wrap 的使用步驟如下：
（1）將我們要加密的sql 語句保存到一個sql文本里。
（2）用wrap 進行處理，指定輸入的sql，即我們第一步的問題，然後指定輸出的路徑和文件名，默認擴展名是plb。
（3）執行我們第二部進過wrap 處理的sql，即plb文件，創建我們的對象.
示例1：wrap funcation
--函數
CREATE OR REPLACE FUNCTION F_DAVE (
n int
) RETURN string
IS
BEGIN
IF n = 1 THEN
RETURN 'Dave is DBA!';
ELSIF n = 2 THEN
RETURN 'Dave come from AnQing!';
ELSE
RETURN 'Dave come from HuaiNing!';
END IF;
END;
/
SYS@dave2(db2)> select F_DAVE(4) fromdual;
F_DAVE(4)
--------------------------------------------------------------------------------
Dave come from HuaiNing!
BTW： 今天羣裏有人問我的blog的例子裏爲啥有安慶，因爲我是安慶懷寧人。
[oracle@db2 ~]$ pwd
/home/oracle
[oracle@db2 ~]$ cat dave.sql
CREATE OR REPLACE FUNCTION F_DAVE (
n int
) RETURNstring
IS
BEGIN
IF n = 1 THEN
RETURN 'Dave is DBA!';
ELSIF n = 2 THEN
RETURN 'Dave come from AnQing!';
ELSE
RETURN 'Dave come from HuaiNing!';
END IF;
END;
/
[oracle@db2 ~]$ wrap iname=dave.sql
PL/SQL Wrapper: Release 10.2.0.1.0-Production on Thu Aug 18 22:59:14 2011
Copyright (c) 1993, 2004, Oracle. All rights reserved.
Processing dave.sql to dave.plb
[oracle@db2 ~]$ ls
bifile.bbd dave.plb dave.sql Desktop log.bbd
[oracle@db2 ~]$ cat dave.plb
CREATE OR REPLACE FUNCTION F_DAVE wrapped
a000000
1
abcd
abcd
abcd
abcd
abcd
abcd
abcd
abcd
abcd
abcd
abcd
abcd
abcd
abcd
abcd
8
10d e7
S9NWrpt8q6tkKEMxCcfYJz2aLF4wgxDQLZ4VfC9AkE6OnV4ydypXGhveHcDg8UXy98WIg6xR
crtc/BRdQJjutbna/9+g0LlaSx87/znV+y926S1AeC0IRi/tjPJTyvJereDdk8mftMo8QMjV
fw0xXn0zVagAawwNVhSAiy/JPTMKkrBkC5ruMwQSTe6JQNq7Q2QtJV0hgQou0rYuet4/gJ5B
wAj75ph6EA==
/
SYS@dave2(db2)> @dave.plb
--再次調用函數，正常使用：
SYS@dave2(db2)> select F_DAVE(4) fromdual;
F_DAVE(4)
--------------------------------------------------------------------------------
Dave come from HuaiNing!
--查看函數源碼，已經加過密了：
SYS@dave2(db2)> select text fromdba_source where name='F_DAVE';
TEXT
--------------------------------------------------------------------------------
FUNCTION F_DAVE wrapped
a000000
1
abcd
abcd
abcd
abcd
abcd
abcd
abcd
abcd
TEXT
--------------------------------------------------------------------------------
abcd
abcd
abcd
abcd
abcd
abcd
abcd
8
10d e7
S9NWrpt8q6tkKEMxCcfYJz2aLF4wgxDQLZ4VfC9AkE6OnV4ydypXGhveHcDg8UXy98WIg6xR
crtc/BRdQJjutbna/9+g0LlaSx87/znV+y926S1AeC0IRi/tjPJTyvJereDdk8mftMo8QMjV
TEXT
--------------------------------------------------------------------------------
fw0xXn0zVagAawwNVhSAiy/JPTMKkrBkC5ruMwQSTe6JQNq7Q2QtJV0hgQou0rYuet4/gJ5B
wAj75ph6EA==
示例2：SYS.DBMS_DDL 函數
the dbms_ddl package provides wrap functionsand create_wrapped procedures, each of whichwraps the pl/sql source text of a single dynamically generated wrappable pl/sqlunit.
The DBMS_DDL packagealso provides the exception MALFORMED_WRAP_INPUT (ORA-24230),which is raised if the input to WRAP or CREATE_WRAPPED isnot a valid wrappable PL/SQL unit. (For the list of wrappable PL/SQL units, seethe introduction to "PL/SQLSource Text Wrapping".)
Each WRAP functiontakes as input a single CREATE statement that creates a wrappablePL/SQL unit and returns an equivalent CREATE statement in which thePL/SQL source text is wrapped. For more information about the WRAP functions,see OracleDatabase PL/SQL Packages and Types Reference.
Each CREATE_WRAPPED proceduredoes what its corresponding WRAP function does and then runs thereturned CREATE statement, creating the specified PL/SQL unit. Formore information about the CREATE_WRAPPED procedures。
該示例直接參考官方文檔：
DECLARE
package_text VARCHAR2(32767); --text for creating package spec and body
FUNCTION generate_spec (pkgname VARCHAR2) RETURN VARCHAR2 AS
BEGIN
RETURN 'CREATE PACKAGE ' || pkgname || ' AUTHID DEFINER AS
PROCEDURE raise_salary (emp_id NUMBER, amount NUMBER);
PROCEDURE fire_employee (emp_id NUMBER);
END ' || pkgname || ';';
ENDgenerate_spec;
FUNCTION generate_body (pkgname VARCHAR2) RETURN VARCHAR2 AS
BEGIN
RETURN'CREATE PACKAGE BODY ' || pkgname || ' AS
PROCEDURE raise_salary (emp_id NUMBER, amount NUMBER) IS
BEGIN
UPDATE employees
SET salary = salary + amount WHERE employee_id = emp_id;
END raise_salary;
PROCEDURE fire_employee (emp_id NUMBER) IS
BEGIN
DELETE FROM employees WHERE employee_id = emp_id;
END fire_employee;
END ' || pkgname || ';';
ENDgenerate_body;
BEGIN
package_text := generate_spec('emp_actions'); -- Generate package spec
EXECUTE IMMEDIATE package_text; -- Create package spec
package_text := generate_body('emp_actions'); -- Generate package body
SYS.DBMS_DDL.CREATE_WRAPPED(package_text); -- Create wrapped package body
END;
/
二. Unwrap 說明
wrap的目的是爲了加密，所以Oracle並沒有提供unwrap 的方法。 itpub上的一些牛人研究了一下這個問題，寫了一些unwrap的代碼。 具體討論的過程，參考itpub的2個帖子：
http://www.itpub.net/thread-1154232-1-2.html
http://www.itpub.net/viewthread.php?tid=1175718&extra=page%3D1&frombbs=1
我這裏貼一下unwrap 的代碼：
/* Formatted on2011/8/18 12:59:54 (QP5 v5.163.1008.3004) */
CREATE OR REPLACE PACKAGE amosunwrapper
IS
FUNCTION deflate (src IN VARCHAR2)
RETURN RAW;
FUNCTION deflate (src IN VARCHAR2, quality IN NUMBER)
RETURN RAW;
FUNCTION inflate (src IN RAW)
RETURN VARCHAR2;
END;
/
CREATE OR REPLACE PACKAGE BODY amosunwrapper
IS
FUNCTION deflate (src IN VARCHAR2)
RETURN RAW
IS
BEGIN
RETURN deflate (src, 6);
END;
FUNCTION deflate (src IN VARCHAR2, quality IN NUMBER)
RETURN RAW
AS
LANGUAGE JAVA
NAME 'UNWRAPPER.Deflate( java.lang.String, int ) returnbyte[]';
FUNCTION inflate (src IN RAW)
RETURN VARCHAR2
AS
LANGUAGE JAVA
NAME 'UNWRAPPER.Inflate( byte[] ) returnjava.lang.String';
END;
/
/* Formatted on2011/8/18 13:00:16 (QP5 v5.163.1008.3004) */
CREATE OR REPLACE JAVA SOURCE NAMED UNWRAPPER
AS import java.io.*;
import java.util.zip.*;
public class UNWRAPPER
{
public static String Inflate( byte[] src )
{
try
{
ByteArrayInputStream bis = new ByteArrayInputStream( src );
InflaterInputStream iis = newInflaterInputStream( bis );
StringBuffer sb = newStringBuffer();
for( int c = iis.read(); c != -1; c = iis.read() )
{
sb.append( (char) c );
}
return sb.toString();
} catch ( Exception e )
{
}
return null;
}
public static byte[] Deflate( String src, intquality )
{
try
{
byte[] tmp = newbyte[ src.length() + 100 ];
Deflater defl = new Deflater( quality );
defl.setInput( src.getBytes( "UTF-8" ) );
defl.finish();
int cnt = defl.deflate( tmp );
byte[] res = newbyte[ cnt ];
for( int i = 0; i < cnt; i++ )
res = tmp;
return res;
} catch ( Exception e )
{
}
return null;
}
}
/
ALTER JAVA SOURCE UNWRAPPER COMPILE
/
/* Formatted on2011/8/18 13:02:57 (QP5 v5.163.1008.3004) */
--爲了輸出中文，要修改java過程
CREATE OR REPLACE JAVA SOURCE NAMED UNWRAPPER
AS import java.io.*;
import java.util.zip.*;
public class UNWRAPPER
{
public static String Inflate( byte[] src )
{
try
{
ByteArrayInputStream bis = newByteArrayInputStream( src );
InflaterInputStream iis = newInflaterInputStream( bis );
StringBuffer sb = newStringBuffer();
for( int c = iis.read(); c != -1; c = iis.read() )
{
sb.append( (char) c );
}
String hello = new String(sb.toString().getBytes("iso8859-1"), "GBK");
return hello;
} catch ( Exception e )
{
}
return null;
}
public static byte[] Deflate( String src, intquality )
{
try
{
byte[] tmp = newbyte[ src.length() + 100 ];
Deflater defl = new Deflater( quality );
defl.setInput( src.getBytes( "UTF-8" ) );
defl.finish();
int cnt = defl.deflate( tmp );
byte[] res = newbyte[ cnt ];
for( int i = 0; i < cnt; i++ )
res = tmp;
return res;
} catch ( Exception e )
{
}
return null;
}
}
/
ALTER JAVA SOURCE UNWRAPPER COMPILE
/
/* Formatted on2011/8/18 13:00:41 (QP5 v5.163.1008.3004) */
CREATE OR REPLACE PROCEDURE unwrap (o IN VARCHAR, n IN VARCHAR, t IN VARCHAR)
AS
vWrappedtext VARCHAR2 (32767);
vtrimtext VARCHAR2 (32767);
vChar VARCHAR2 (2);
vRepchar VARCHAR2 (2);
vLZinflatestr VARCHAR2 (32767);
nLen INTEGER;
nLoop INTEGER;
nCnt INTEGER;
code VARCHAR (512);
BEGIN
code :=
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sys.idltranslate表內容存到字符數組
vtrimtext := '';
SELECT COUNT (*)
INTO ncnt
FROM DBA_SOURCE
WHERE owner = o AND Name = n AND TYPE = t;
IF ncnt > 0 AND ncnt <= 5
THEN
FOR i IN 1 .. ncnt
LOOP
IF i = 1
THEN
SELECT RTRIM (SUBSTR (TEXT,
INSTR (TEXT,
CHR (10),
1,
20)
+ 1),
CHR (10)) --保存去掉前邊20行的BASE64碼正文
INTO vLZinflatestr
FROM DBA_SOURCE
WHERE owner = o AND Name = n AND TYPE = t AND line = i;
ELSE
SELECT text
INTO vLZinflatestr
FROM DBA_SOURCE
WHERE owner = o AND Name = n AND TYPE = t AND line = i;
END IF;
vtrimtext := vtrimtext || vLZinflatestr;
END LOOP;
END IF;
vtrimtext := REPLACE (vtrimtext, CHR (10), '');
nLen := LENGTH (vtrimtext) / 256;
vWrappedtext := '';
FOR i IN 0 .. nLen
LOOP
--ifi< nLen then
vWrappedtext :=
vWrappedtext
|| UTL_ENCODE.base64_decode (
UTL_RAW.cast_to_raw (SUBSTRB (vtrimtext, 256 * i + 1, 256)));
--else
--vWrappedtext:=vWrappedtext||utl_encode.base64_decode(utl_raw.cast_to_raw(substrb(vtrimtext,64*i+1 ))) ;
--endif;
--DBMS_OUTPUT.PUT_LINE(vWrappedtext);
END LOOP;
--vWrappedtext:=substr(vWrappedtext,41);
nLen := LENGTH (vWrappedtext) / 2 - 1;
vLZinflatestr := '';
FOR nLoop IN 20 .. nLen
LOOP --從第41字節開始
vChar := SUBSTRB (vWrappedtext, nLoop * 2 + 1, 2);
vLZinflatestr :=
vLZinflatestr || SUBSTR (code, TO_NUMBER (vChar, 'XX') * 2 + 1, 2); --從字符串變量匹配
--DBMS_OUTPUT.PUT_LINE(vLZinflatestr);
END LOOP;
--DBMS_OUTPUT.PUT_LINE(vLZinflatestr);
DBMS_OUTPUT.PUT_LINE (amosunwrapper.inflate (vLZinflatestr));
END;
/
黃煒弄了一個界面的Unwrap軟件，下載地址：
破解(Unwrap) 10, 11G PLSQL
http://www.hellodba.com/reader.php?ID=36&lang=cn
unwrap 我們第一節創建的F_DAVE函數：
不過Oracle 對一些對象進行加密的同時，也提供了代碼，比如DBMS_ROWID包。 對於該包使用unwrap 和 直接從dba_source 查詢的結果是一致的，而且dba_source 還提供了註釋。
SQL>exec unwrap('SYS','DBMS_ROWID','PACKAGE BODY');
SQL>select * from dba_source where name='DBMS_ROWID';