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标题：通过DBMS_CRYPTO包对表敏感字段进行加密

作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

在安全越来越重视的近体，我们不少时候需要对数据库中的某个表的敏感列数据(银行卡,身份证号码,金额等)进行加密，方式数据泄密,在11.2.0.4中可以通过dbms_crypto包方式实现,增加oracle的加密效率,本文提供处理思路,其他可以根据需求尽情发挥
数据库版本

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
PL/SQL Release 11.2.0.4.0 - Production
CORE    11.2.0.4.0      Production
TNS for Linux: Version 11.2.0.4.0 - Production
NLSRTL Version 11.2.0.4.0 - Production
[/shell]
<strong>创建加密函数</strong>
1
SQL> create or replace function f_Encrypt_number(number_in in varchar2) return raw is
  2  number_in_raw RAW(128):=UTL_I18N.STRING_TO_RAW(number_in,'AL32UTF8');
  3  key_number number(32):=32432432343243279898;
  4  key_raw RAW(128):=UTL_RAW.cast_from_number(key_number);
  5  encrypted_raw RAW(128);
  6  begin
  7  encrypted_raw:=dbms_crypto.Encrypt(src=>number_in_raw,typ=>DBMS_CRYPTO.DES_CBC_PKCS5,key=>key_raw);
  8  return encrypted_raw;
  9  end;
 10  /

Function created.

测试加密函数

SQL> select f_Encrypt_number('wwww.xifenfei.com') from dual;

F_ENCRYPT_NUMBER('WWWW.XIFENFEI.COM')
--------------------------------------------------------------------------------
003CB89CB77F6644C93AE2CF7810B0E3E3B10B8C60B54058

创建解密函数

SQL> create or replace function f_decrypt_number (encrypted_raw IN RAW)
  2  return varchar2 is
  3  decrypted_raw raw(48);
  4  key_number number(32):=32432432343243279898;
  5  key_raw RAW(128):=UTL_RAW.cast_from_number(key_number);
  6  begin
  7  decrypted_raw := DBMS_CRYPTO.DECRYPT
  8  (
  9  src => encrypted_raw,
 10  typ => DBMS_CRYPTO.DES_CBC_PKCS5,
 11  key => key_raw
 12  );
 13  return UTL_I18N.RAW_TO_CHAR (decrypted_raw, 'AL32UTF8');
 14  END;
 15  /

Function created.

测试解密函数

SQL> select f_decrypt_number('003CB89CB77F6644C93AE2CF7810B0E3E3B10B8C60B54058') from dual;

F_DECRYPT_NUMBER('003CB89CB77F6644C93AE2CF7810B0E3E3B10B8C60B54058')
--------------------------------------------------------------------------------
wwww.xifenfei.com

创建表综合测试

SQL> create table xifenfei_crypto
  2  (id number, name varchar2(20),en_name raw(128)) ;

Table created.

SQL> insert into xifenfei_crypto (id,name) select object_id,object_name from dba_objects where rownum<10;

9 rows created.

SQL> commit;

Commit complete.

SQL> select * from xifenfei_crypto;

        ID NAME                 EN_NAME
---------- -------------------- ------------------------------
        20 ICOL$
        46 I_USER1
        28 CON$
        15 UNDO$
        29 C_COBJ#
         3 I_OBJ#
        25 PROXY_ROLE_DATA$
        41 I_IND1
        54 I_CDEF2

9 rows selected.

SQL> update xifenfei_crypto set en_name=f_Encrypt_number(name);

9 rows updated.

SQL> commit;

Commit complete.

SQL> select * from xifenfei_crypto;

        ID NAME                 EN_NAME
---------- -------------------- --------------------------------------------------
        20 ICOL$                FE17B031331839A9
        46 I_USER1              FEF96765B1E2C53C
        28 CON$                 0283FCE900ACED5C
        15 UNDO$                20DD92762F199436
        29 C_COBJ#              A0CB43E2EA6BA889
         3 I_OBJ#               F2DE1B9C8A39AA3D
        25 PROXY_ROLE_DATA$     62B99C02EBD4B250311E4490207FEF18CBD8CD8FBA1BFD81
        41 I_IND1               3F4C3C186F8E2F52
        54 I_CDEF2              CA23D202802BD3AC

9 rows selected.

SQL> select id,name,f_decrypt_number(EN_NAME) de_name,en_name from  xifenfei_crypto;

        ID NAME                 DE_NAME                        EN_NAME
---------- -------------------- ------------------------------ --------------------------------------------------
        20 ICOL$                ICOL$                          FE17B031331839A9
        46 I_USER1              I_USER1                        FEF96765B1E2C53C
        28 CON$                 CON$                           0283FCE900ACED5C
        15 UNDO$                UNDO$                          20DD92762F199436
        29 C_COBJ#              C_COBJ#                        A0CB43E2EA6BA889
         3 I_OBJ#               I_OBJ#                         F2DE1B9C8A39AA3D
        25 PROXY_ROLE_DATA$     PROXY_ROLE_DATA$               62B99C02EBD4B250311E4490207FEF18CBD8CD8FBA1BFD81
        41 I_IND1               I_IND1                         3F4C3C186F8E2F52
        54 I_CDEF2              I_CDEF2                        CA23D202802BD3AC

9 rows selected.