oracle9.1的加密解密包的用法

oracle9.1的加密解密包
双向加密算法
dbms_obfuscation_toolkit.desencrypt
dbms_obfuscation_toolkit.desdecrypt

dbms_obfuscation_toolkit.DES3Encrypt
dbms_obfuscation_toolkit.DES3Decrypt

单向加密算法
dbms_obfuscation_toolkit.md5

具体用法参见以下函数
--MD5加密
create or replace function
encrypt_md5(p_text varchar2) return varchar2 is
begin
 --添加RawToHex(UTL_RAW.CAST_TO_RAW())为得是加密后的输出数据规范些
 --input_string必须要有，否则没有办法区分到底是调用那个md5
 return RawToHex(UTL_RAW.CAST_TO_RAW(dbms_obfuscation_toolkit.MD5(input_string=>p_text)));
end;

--DES加密
create or replace function
encrypt_des(p_text varchar2, p_key varchar2) return varchar2 is
begin
 return UTL_RAW.CAST_TO_RAW(dbms_obfuscation_toolkit.DESENCRYPT(input_string => p_text,
 key_string => p_key));
end;
--DES解密
create or replace function decrypt_data(p_text varchar2,p_key varchar2) return varchar2 is
v_text varchar2(4000);
begin
dbms_obfuscation_toolkit.DESDECRYPT(
input_string => UTL_RAW.CAST_TO_varchar2(p_text),
key_string => p_key,
decrypted_string=> v_text);
return v_text;
end;

附录oracle9.2文档自带的DES3加密解密实例：
DECLARE
   input_string        VARCHAR2(16) := 'tigertigertigert';
   raw_input           RAW(128) := UTL_RAW.CAST_TO_RAW(input_string);
   key_string          VARCHAR2(16)  := 'scottscottscotts';
   raw_key             RAW(128) := UTL_RAW.CAST_TO_RAW(key_string);
encrypted_raw               RAW(2048);
   encrypted_string            VARCHAR2(2048);
decrypted_raw               RAW(2048);
   decrypted_string            VARCHAR2(2048);
   error_in_input_buffer_length EXCEPTION;
   PRAGMA EXCEPTION_INIT(error_in_input_buffer_length, -28232);
   INPUT_BUFFER_LENGTH_ERR_MSG VARCHAR2(100) :=
    '*** DES INPUT BUFFER NOT A MULTIPLE OF 8 BYTES - IGNORING EXCEPTION ***';
   double_encrypt_not_permitted EXCEPTION;
   PRAGMA EXCEPTION_INIT(double_encrypt_not_permitted, -28233);
   DOUBLE_ENCRYPTION_ERR_MSG VARCHAR2(100) :=
    '*** CANNOT DOUBLE ENCRYPT DATA - IGNORING EXCEPTION ***';

-- 1. Begin testing raw data encryption and decryption
   BEGIN
   dbms_output.put_line('> ========= BEGIN TEST RAW DATA =========');
   dbms_output.put_line('> Raw input                        : ' ||
                 UTL_RAW.CAST_TO_VARCHAR2(raw_input));
   BEGIN
      dbms_obfuscation_toolkit.DES3Encrypt(input => raw_input,
               key => raw_key, encrypted_data => encrypted_raw );
      dbms_output.put_line('> encrypted hex value              : ' ||
               rawtohex(encrypted_raw));
      dbms_obfuscation_toolkit.DES3Decrypt(input => encrypted_raw,
               key => raw_key, decrypted_data => decrypted_raw);
      dbms_output.put_line('> Decrypted raw output             : ' ||
                    UTL_RAW.CAST_TO_VARCHAR2(decrypted_raw));
      dbms_output.put_line('>  ');     
      if UTL_RAW.CAST_TO_VARCHAR2(raw_input) =
                    UTL_RAW.CAST_TO_VARCHAR2(decrypted_raw) THEN
         dbms_output.put_line('> Raw DES3 Encyption and Decryption successful');
      END if;
   EXCEPTION
      WHEN error_in_input_buffer_length THEN
             dbms_output.put_line('> ' || INPUT_BUFFER_LENGTH_ERR_MSG);
   END;
   dbms_output.put_line('>  ');
END;

-- 2. Begin testing string data encryption and decryption
   dbms_output.put_line('> ========= BEGIN TEST STRING DATA =========');

   BEGIN
      dbms_output.put_line('> input string                     : '
                           || input_string);
      dbms_obfuscation_toolkit.DES3Encrypt(
               input_string => input_string,
               key_string => key_string,
               encrypted_string => encrypted_string );
      dbms_output.put_line('> encrypted hex value              : ' ||
                   rawtohex(UTL_RAW.CAST_TO_RAW(encrypted_string)));
      dbms_obfuscation_toolkit.DES3Decrypt(
               input_string => encrypted_string,
               key_string => key_string,
               decrypted_string => decrypted_string );
      dbms_output.put_line('> decrypted string output          : ' ||
                 decrypted_string);
      if input_string = decrypted_string THEN
         dbms_output.put_line('> String DES3 Encyption and Decryption
successful');
      END if;
   EXCEPTION
      WHEN error_in_input_buffer_length THEN
             dbms_output.put_line(' ' || INPUT_BUFFER_LENGTH_ERR_MSG);
   END;
   dbms_output.put_line('>  ');
END;

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