Oracle wrap 和 unwrap（ 加密与解密） 说明

一.Wrap 说明
官网的说明如下：
APL/SQL Source Text Wrapping
http://download.oracle.com/docs/cd/E11882_01/appdev.112/e17126/wrap.htm#LNPLS1744

Youcan wrap the PL/SQL source text for any of thesestored PL/SQL units, therebypreventing 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 awrapped 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 aDBMS_DDLsubprogram.The PL/SQL Wrapper utility wraps the source text of every wrappable PL/SQL unitcreated by a specified SQL file. TheDBMS_DDLsubprograms wrap thesource textof single dynamically generated wrappable PL/SQL units.
Both the PL/SQL Wrapper utility andDBMS_DDLsubprograms 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加密的原理就是先对源码进行lz压缩lzstr，然后对压缩数据进行SHA-1运算得到40位的加密串shstr，然后将加密串与压缩串拼接得到shstr+lzstr，然后对拼接后的字符串进行Oracle双字符转换（转换表）。最后将转换后的字符串进行base64编码，最终得到wrap的加密串。

The default file extension forinput_fileissql. The default nameofoutput_fileisinput_file.plb. Therefore, these commands are equivalent:
wrapiname=/mydir/myfile
wrapiname=/mydir/myfile.sql oname=/mydir/myfile.plb
Thisexamplespecifies a different file extension forinput_fileand adifferent name foroutput_file:
wrapiname=/mydir/myfile.src oname=/yourdir/yourfile.out

wrap的使用步骤如下：
（1）将我们要加密的sql 语句保存到一个sql文本里。
（2）用wrap 进行处理，指定输入的sql，即我们第一步的问题，然后指定输出的路径和文件名，默认扩展名是plb。
（3）执行我们第二部进过wrap 处理的sql，即plb文件，创建我们的对象.


示例1：wrapfuncation
--函数
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：今天群里有人问我的blog的例子里为啥有安庆，因为我是安庆怀宁人。

[oracle@db2 ~]$ pwd
/home/oracle
[oracle@db2 ~]$catdave.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 ~]$wrapiname=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.bbddave.plb dave.sql Desktoplog.bbd

[oracle@db2 ~]$catdave.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

--再次调用函数，正常使用：
SYS@dave2(db2)> select F_DAVE(4) fromdual;

F_DAVE(4)
--------------------------------------------------------------------------------
Dave come from HuaiNing!

--查看函数源码，已经加过密了：
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函数
thedbms_ddlpackage provideswrapfunctionsandcreate_wrappedprocedures, each of whichwraps the pl/sql source text of a single dynamically generated wrappable pl/sqlunit.
TheDBMS_DDLpackagealso provides the exceptionMALFORMED_WRAP_INPUT(ORA-24230),whichis raised if the input toWRAPorCREATE_WRAPPEDisnot a valid wrappable PL/SQL unit. (For the list of wrappable PL/SQL units, seethe introduction to"PL/SQLSourceText Wrapping".)

EachWRAPfunctiontakes as input a singleCREATEstatement that creates a wrappablePL/SQL unit and returns an equivalentCREATEstatement in which thePL/SQL source text is wrapped. For more information about theWRAPfunctions,seeOracleDatabasePL/SQL Packages and Types Reference.

EachCREATE_WRAPPEDproceduredoes what its correspondingWRAPfunction does and then runs thereturnedCREATEstatement, creating the specified PL/SQL unit. Formore information about theCREATE_WRAPPEDprocedures。

该示例直接参考官方文档：

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 说明
wrap的目的是为了加密，所以Oracle并没有提供unwrap 的方法。 itpub上的一些牛人研究了一下这个问题，写了一些unwrap的代码。 具体讨论的过程，参考itpub的2个帖子：
http://www.itpub.net/thread-1154232-1-2.html
http://www.itpub.net/viewthread.php?tid=1175718&extra=page%3D1&frombbs=1

我这里贴一下unwrap的代码：
/*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
ASimportjava.io.*;
importjava.util.zip.*;
publicclassUNWRAPPER
{
publicstaticString Inflate(byte[]src)
{
try
{
ByteArrayInputStream bis=newByteArrayInputStream(src);
InflaterInputStream iis=newInflaterInputStream(bis);
StringBuffer sb=newStringBuffer();
for(intc=iis.read();c!=-1;c=iis.read())
{
sb.append((char)c);
}
returnsb.toString();
}catch (Exception e)
{
}
returnnull;
}
publicstatic byte[]Deflate(Stringsrc,intquality)
{
try
{
byte[]tmp=newbyte[src.length()+ 100 ];
Deflater defl=newDeflater(quality);
defl.setInput(src.getBytes("UTF-8"));
defl.finish();
intcnt=defl.deflate(tmp);
byte[]res=newbyte[cnt];
for(inti=0;i<cnt;i++)
res=tmp;
returnres;
}catch (Exception e)
{
}
returnnull;
}
}
/

ALTER JAVA SOURCE UNWRAPPER COMPILE
/

/*Formatted on2011/8/18 13:02:57 (QP5 v5.163.1008.3004) */
--为了输出中文，要修改java过程
CREATE OR REPLACE JAVA SOURCE NAMED UNWRAPPER
ASimportjava.io.*;
importjava.util.zip.*;

publicclassUNWRAPPER
{
publicstaticString Inflate(byte[]src)
{
try
{
ByteArrayInputStream bis=newByteArrayInputStream(src);
InflaterInputStream iis=newInflaterInputStream(bis);
StringBuffer sb=newStringBuffer();
for(intc=iis.read();c!=-1;c=iis.read())
{
sb.append((char)c);
}
String hello=newString(sb.toString().getBytes("iso8859-1"),"GBK");
returnhello;
}catch (Exception e)
{
}
returnnull;
}
publicstatic byte[]Deflate(Stringsrc,intquality)
{
try
{
byte[]tmp=newbyte[src.length()+ 100 ];
Deflater defl=newDeflater(quality);
defl.setInput(src.getBytes("UTF-8"));
defl.finish();
intcnt=defl.deflate(tmp);
byte[]res=newbyte[cnt];
for(inti=0;i<cnt;i++)
res=tmp;
returnres;
}catch (Exception e)
{
}
returnnull;
}
}
/

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表内容存到字符数组

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))--保存去掉前边20行的BASE64码正文
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--从第41字节开始
vChar := SUBSTRB (vWrappedtext, nLoop * 2 + 1, 2);
vLZinflatestr :=
vLZinflatestr || SUBSTR (code, TO_NUMBER (vChar, 'XX') * 2 + 1, 2);--从字符串变量匹配
--DBMS_OUTPUT.PUT_LINE(vLZinflatestr);
END LOOP;

--DBMS_OUTPUT.PUT_LINE(vLZinflatestr);
DBMS_OUTPUT.PUT_LINE(amosunwrapper.inflate(vLZinflatestr));
END;
/

阿里巴巴的张端弄了一个界面的Unwrap软件，下载地址：
破解(Unwrap) 10, 11G PLSQL
http://www.hellodba.com/reader.php?ID=36&lang=cn


unwrap 我们第一节创建的F_DAVE函数：


不过Oracle 对一些对象进行加密的同时，也提供了代码，比如DBMS_ROWID包。 对于该包使用unwrap 和 直接从dba_source 查询的结果是一致的，而且dba_source 还提供了注释。

SQL>exec unwrap('SYS','DBMS_ROWID','PACKAGE BODY');
SQL>select * from dba_source where name='DBMS_ROWID';





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