//
//							?Software?License?Agreement
//
//?The?software?supplied?herewith?by?Microchip?Technology?Incorporated?
//?（the?“Company“）?for?its?PICmicro?Microcontroller?is?intended?and?
//?supplied?to?you?the?Company抯?customer?for?use?solely?and?
//?exclusively?on?Microchip?PICmicro?Microcontroller?products.?The?
//?software?is?owned?by?the?Company?and/or?its?supplier?and?is?
//?protected?under?applicable?copyright?laws.?All?rights?are?reserved.?
//??Any?use?in?violation?of?the?foregoing?restrictions?may?subject?the?
//?user?to?criminal?sanctions?under?applicable?laws?as?well?as?to?
//?civil?liability?for?the?breach?of?the?terms?and?conditions?of?this?
//?license.
//
//?THIS?SOFTWARE?IS?PROVIDED?IN?AN?“AS?IS“?CONDITION.?NO?WARRANTIES?
//?WHETHER?EXPRESS?IMPLIED?OR?STATUTORY?INCLUDING?BUT?NOT?LIMITED?
//?TO?IMPLIED?WARRANTIES?OF?MERCHANTABILITY?AND?FITNESS?FOR?A?
//?PARTICULAR?PURPOSE?APPLY?TO?THIS?SOFTWARE.?THE?COMPANY?SHALL?NOT?
//?IN?ANY?CIRCUMSTANCES?BE?LIABLE?FOR?SPECIAL?INCIDENTAL?OR?
//?CONSEQUENTIAL?DAMAGES?FOR?ANY?REASON?WHATSOEVER.
//
//-------------------------------------------------------------------------
//??LEGAL?NOTICE
//
//??The?information?contained?in?this?document?is?proprietary?and?
//??confidential?information?of?Microchip?Technology?Inc.??Therefore?all?
//??parties?are?required?to?sign?a?non-disclosure?agreement?before?
//??receiving?this?document.
//-------------------------------------------------------------------------
//??Keeloq?Decryption?Algorithm
//
//??optimized?for?CCS?PIC?C?compiler?v.?2.535
//?
//??version?1.00?????01/09/2001?Lucio?Di?Jasio
//
//??INPUTS:
//??????DKEY[0..7]??????64bit?decryption?key?（pre?loaded）
//??????Buffer[0..3]????32bit?shift?register?（pre?loaded?with?text?to?decrytp）
//??OUTPUTS:
//??????Buffer[0..3]????32bit?plain?text?（decrypted?message）
//?
//=========================================================================
unsigned?int?DKEY[8];
unsigned?int?Buffer[3];

void?Decrypt（）
{
????unsigned?int????i?j?key?aux;?//?8bit?variables
????signed?int??????p;??????????????//?7bit?+sign

????p?=?1;

????for?（j=66;?j>0;?j--）
????{
????????key?=?DKEY[p--];
????????if?（p<0）
????????????p+=8;

????????for?（i=8;?i>0;?i--）
????????{
????????????//?NLF
????????????if?（?BIT_TEST（?Buffer[3]6））
????????????{
????????????????if?（?!BIT_TEST（?Buffer[3]1））
????????????????????aux?=?0b00111010;???//?10
????????????????else
????????????????????aux?=?0b01011100;???//?11
????????????}
????????????else
????????????{
????????????????if?（?!BIT_TEST（?Buffer[3]1））
????????????????????aux?=?0b01110100;???//?00
????????????????else
????????????????????aux?=?0b00101110;???//?01
????????????}


????????????//?move?bit?in?position?7
????????????if?（?BIT_TEST（?Buffer[2]3））?
????????????????SWAP（?aux）;
????????????if?（?BIT_TEST（?Buffer[1]0））?
????????????????aux<<=2;?
????????????if?（BIT_TEST（?Buffer[0]0））?
????????????????a

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件?????326582??2001-03-09?17:42??Keeloq?C語言解碼\C_DECODER\00745a_c.pdf

?????文件??????17557??2001-06-06?10:16??Keeloq?C語言解碼\C_DECODER\An745_c.zip

?????目錄??????????0??2005-04-23?08:44??Keeloq?C語言解碼\C_DECODER

?????文件?????185106??2001-03-09?18:00??Keeloq?C語言解碼\C_DECRYPT\91041a_c.pdf

?????文件???????4490??2001-03-14?09:47??Keeloq?C語言解碼\C_DECRYPT\Tb041_c.zip

?????文件???????3578??2001-01-10?14:19??Keeloq?C語言解碼\C_DECRYPT\hitechc.c

?????文件???????2766??2001-01-10?14:19??Keeloq?C語言解碼\C_DECRYPT\genc.c

?????文件???????3283??2001-01-10?14:04??Keeloq?C語言解碼\C_DECRYPT\ccsc.c

?????目錄??????????0??2005-04-23?08:44??Keeloq?C語言解碼\C_DECRYPT

?????文件?????271129??1998-10-29?15:06??Keeloq?C語言解碼\NORMAL\00642b_c.pdf

?????文件??????58039??2001-06-13?10:18??Keeloq?C語言解碼\NORMAL\normal.asm

?????目錄??????????0??2005-04-23?08:44??Keeloq?C語言解碼\NORMAL

?????目錄??????????0??2005-04-23?08:44??Keeloq?C語言解碼

-----------?---------??----------?-----??----

???????????????872748????????????????????14