Oracle 字符串加密方法

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　　 测试环境：oracle10g
　　
　　1、方法一 MD5加密

create or replace function fn_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 rawtohex(decrypted_raw);
END;
　　
　　2、方法二 3des算法

create or replace package PG_ENCRYPT_DECRYPT
is
iKey varchar2(8):='Oracle9i';
function GEN_RAW_KEY ( iKey in varchar2) return raw;
function DECRYPT_3KEY_MODE(iValue in raw,iMode in pls_integer)return varchar2;
function ENCRYPT_3KEY_MODE(iValue in varchar2,iMode in pls_integer)return raw;
function FormatStr(iValue in varchar2)return varchar2;
function FormatStr2(iValue in varchar2)return varchar2;
end;
　　
　　

create or replace package body PG_ENCRYPT_DECRYPT
is
function GEN_RAW_KEY ( iKey in varchar2)
return raw
as
rawkey raw(240) := '';
begin
for i in 1..length(iKey) loop
rawkey := rawkey || hextoraw(to_char(ascii(substr(iKey, i, 1))));
end loop;
return rawkey;
end GEN_RAW_KEY;
/* Creating function DECRYPT_3KEY_MODE*/
FUNCTION DECRYPT_3KEY_MODE ( iValue in raw, iMode in pls_integer)return varchar2
as
vDecrypted varchar2(4000);
rawkey raw(240) := '';
begin
rawkey := GEN_RAW_KEY(iKey);-- decrypt input string
vDecrypted := dbms_obfuscation_toolkit.des3decrypt (UTL_RAW.CAST_TO_VARCHAR2(iValue), key_string => rawkey, which => iMode);
return FormatStr2(vDecrypted);
end DECRYPT_3KEY_MODE;
/*Creating function ENCRYPT_3KEY_MODE*/
FUNCTION ENCRYPT_3KEY_MODE ( iValue in varchar2, iMode in pls_integer)return raw
as
vEncrypted varchar2(4000);
vEncryptedRaw Raw(2048);
rawkey raw(240) := '';
begin
rawkey := GEN_RAW_KEY(iKey);-- encrypt input string
vEncrypted := dbms_obfuscation_toolkit.des3encrypt (FormatStr(iValue), key_string => rawkey, which => iMode);
-- convert to raw as out
vEncryptedRaw := UTL_RAW.CAST_TO_RAW(vEncrypted);
return vEncryptedRaw;
end ENCRYPT_3KEY_MODE;
function FormatStr(iValue in varchar2)return varchar2
as
begin
declare
i number;
j number;
m_value varchar2(4000);
begin
m_value:=iValue;
i:=(length(m_value) mod 8);
if i<>0 then
j:=1;
for j in 1..(8-i) loop
m_value:=m_value || '#';
end loop;
end if;
return m_value;
end;
end FormatStr;
function FormatStr2(iValue in varchar2)return varchar2
as
begin
declare
i number;
j number;
m_value varchar2(4000);
begin
m_value:=iValue;
i:=instr(iValue,'#',1,1);
if i>0 then
m_value:=substr(m_value,1,i-1);
end if;
return m_value;
end;
end FormatStr2;
end PG_ENCRYPT_DECRYPT;