'===========================================================================
' Subject: PRETTY GOOD ENCRYPTION             Date: 03-10-00 (13:16)       
'  Author: Randall L. Glass                   Code: PB                     
'  Origin: rlglass@yahoo.com                Packet: PB.ABC
'===========================================================================
'---------------------------------------------------------------------------
'                        Pretty Good Encryption
'
'                          By Randall L Glass
'                            Copyright 2000
'
' Permission is given to use Pretty Good Encryption in any way you want
' as long as you give me credit somewhere in your program or documentation.
'---------------------------------------------------------------------------
'
' After studing about encryption I have come to the conclusion that most
' inventors of encryption programs really don't know what they are doing.
'
' They make such complicated programs. My feeling is when people make
' something so complicated is they don't really understand the subject.
'
'
' I have taken the simple theory of encryption and created Pretty Good
' Encryption.
'
' The encryption goal is to create an random output from an plain text.
'
' Encryption can do this in two ways. Scrambling the position of letters in
' a plain text; thus removing the horizontal pattern of the letters.
'
' Example the word "program" becomes "rpmargo".
'
' The second way is to substitute one letter for another.
'
' Example the word "program " becomes "qsphsbn"
'
' Each one of these leaves some pattern.
'
' But when you combine them it gets rid of most of the pattern from the
' plain text.
'
' The trick is to figure an way that produces an random like output.
'
' Pretty Good Encryption does this by using the RC4 encryption algorithim.
'
' RC4 produces almost completely an random output. Some think that NSA
' can break RC4. But it is secure enought for our purpose.
'
'
' Pretty Good Encryption starts out by choosing random numbers for an
' Initialization Vector.
'
' It then encrypts the IV producing a Feedback String.[32 byte block]
'
' Pretty Good Encryption then XOR'S the Feedback String with the Plain Text
' block.[32 byte block] Thus even if the snoop had choosen an Plain Text;
' their Plain Text just got encrypted. It won't do him any good.
'
' The Plain Text block is then scrambled bit wise. Example "1011" becomes
' "1110". This scrambling gets rid of any pattern producing an random like
' output.
'
' Then we use RC4 to substitute one number for an other by XORing an random
' number output with a number produced by the previous scrambling.
'
' RC4 is okay to use because it is encrypting an random like pattern.
' Thus making it about impossible to decrypt with out the key.
'
' The Encrypted string block[32 bytes] then becomes then new Feedback String.
'
' After the Plain Text is encrypted, the IV is then attached to the beggining
' of the encrypted text.
'
' You might think that we should of encrypted the IV before attaching It to
' the encrypted string; BUT that would have SERVERLY WEAKEN the security of
' the encrypted string !
'
' We do not want anyone to know what the inital Feedback String is.
'
' By using an different Initialization Vector each time, you can use the same
' key over and over again and still be secure.
'
' RC4 is idea for Pretty Good Encryption because in initializing for RC4 we
' also produce an bit array scramble key to determine how we scramble
' the bits.
'
' You should always use an key length of 256 bytes for maxium security.
'
' Pretty Good Encryption block size is 256 bits. There are 8.57 * 10^506
' different possibilities in scambling these bits.
'
' With an full key size of 256 bytes, assumming that NSA could use a computer
' that can try one trillion keys per second,it would take 2.72 * 10^487 years
' to break. In other words the sun would burn out before they could break it.
'
' Thus this program is probably better than or equal to the  military
' encryption programs.
'
'----------------------------------------------------------------------------


$CPU 80386
DEFINT A-Z
DECLARE FUNCTION GetStrLoc(BYVAL AllocHandle%) AS LONG

CLS
DIM Rc4Key%(255),FeedBack AS SHARED STRING * 32
SHARED RI?,RJ?,SblockPtr32???,ScambleBlockPtr32???
SHARED Rc4Key%()

SblockPtr32??? = CODEPTR32(SBLOCK)
ScambleBlockPtr32??? = CODEPTR32(ScambleBlock)

RANDOMIZE TIMER

FLEXCHR$ = CHR$(0)

CodeKey$ = "TEST KEY"                       ' Set key
                                            ' should be 256 bytes long
CLS                                         ' for the maxium security 

InitKey CodeKey$
Rc4Init                                   'Initialize the key schedule

PlainText$ = "ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ"

Encrypt PlainText$,CipherText$          'Encrypt the string


Rc4Init                                 're-Initialize the key
Decrypt CipherText$,PlainText$          'Decrypt the string
END

SUB Encrypt(PlainText AS STRING,CipherText AS STRING)
 STATIC InitFlag%
 AddPadding% = 0
 IF InitFlag% = 0 THEN
	IV$ = RndIV$
        EncryptedIV$ = STRING$(32,0)
        EncodeString IV$,EncryptedIV$,0
        LSET FeedBack$ = EncryptedIV$
 END IF

 PlainTextLen% = LEN(PlainText$)
 ExtraLetters% = PlainTextLen% MOD 32
 IF ExtraLetters% THEN
        AddPadding% = 32 - ExtraLetters%
        PlainText$  = PlainText$ + STRING$(AddPadding%,0)
        INCR PlainTextLen%,AddPadding%
 END IF
 CipherText$ = STRING$(PlainTextLen% + AddPadding%,CHR$(0))

 Strings% = PlainTextLen%\32
 FOR I% = 0 TO Strings% -1
        XorStr PlainText$, FeedBack$, I%
        EncodeString PlainText$,CipherText$,I%
        LSET FeedBack$ =  MID$(CipherText$,I% * 32 + 1,32)
 NEXT I%

 IF InitFlag% = 0 THEN
        CipherText$ = IV$ + CipherText$
        InitFlag% = 1
 END IF

END SUB

FUNCTION Decrypt$(CipherText$,PlainText$)
 DIM Temp AS STRING * 32
 STATIC InitFlag%
 StartString% = 0
 IF InitFlag% = 0 THEN
	IV$ = LEFT$(CipherText$,32)
        EncryptedIV$ = STRING$(32,0)
        EncodeString IV$,EncryptedIV$,0
        LSET FeedBack$ = EncryptedIV$
        StartString% = 1
 END IF

 CipherLen% = LEN(CipherText$)
 PlainText$ = STRING$(CipherLen%,CHR$(0))
 Strings% = CipherLen%\32

 FOR I% = StartString% TO Strings% -1
        LSET Temp$ = MID$(CipherText$,I% * 32 + 1,32)
        DecodeString CipherText$,PlainText$,I%
        XorStr Plaintext$,FeedBack$,I%
        LSET FeedBack$ = Temp$
 NEXT I%

 IF InitFlag% = 0 THEN
        PlainText$ = MID$(PlainText$,33)
        InitFlag% = 1
 END IF

 PlainText$ = RTRIM$(PlainText$,CHR$(0))
END FUNCTION

FUNCTION RndIV$
 PRINT "Enter the word Secret And press enter"
 DO
	DO
	        ky$ = inkey$
		RndNum&& = RND(1,1000000000000)
	LOOP UNTIL Ky$ <> ""

        PRINT Ky$;
        RANDOMIZE RndNum&&
 LOOP UNTIL ky$ = CHR$(13)

FOR I% = 1 TO 32
        Temp$ = Temp$ + CHR$(RND(0,255))
NEXT I%
RndIV$ = Temp$
END FUNCTION

SUB XorStr(Str1 AS STRING ,Str2 AS STRING * 32,BYVAL Index%)
! LES BX, Str1$
! MOV AX,ES:[BX]
! PUSH AX
! CALL GetStrLoc          ; find where the data is located
! MOV ES, DX              ; put segment in ES
! MOV DI, AX              ; put offset in DI
! MOV AX,Index%
! MOV CL,5                ;Multiply AX by 32
! SHL AX,CL
! ADD DI,AX               ;adjust address
! PUSH DS
! LDS SI,Str2$
! MOV CX,8
XorLoop2:
! DB &H66         ;LODSD
! DB &HAD
! DB &H66         ;XOR ES:[DI],EAX
! DB &H26
! DB &H31
! DB &H05
! ADD DI,4
! LOOP XorLoop2
! POP DS
END SUB

SUB Rc4Init()
RI? = 0:RJ? = 0
! MOV BX,0             ;BL = I
! MOV CX,256
InitSBlock:
! MOV SBLOCK?[BX],BL   ;SBlock?(I) = I
! INC BL
! LOOP InitSBlock

! MOV BX,0      ;BX = J
! MOV DI,0      ;DI = I
! MOV CX,256
InitSblock2:
! ADD BL,SBlock?[DI]
! ADD BL,KeyBlock?[DI]
! MOV AL,SBlock[BX]
! MOV AH,SBLOCK[DI]
! MOV SBlock[BX],AH
! MOV SBLOCK[DI],AL
! INC DI
! LOOP InitSblock2

! LES DI,ScambleBlockPtr32???
! PUSH DS
! LDS SI,SBlockPtr32???
! CLD
! MOV CX, 64
! DB &HF3                  ; REP MOVSD
! DB &H66
! DB &HA5
! POP DS

END SUB

SUB InitKey(CodeKey$)
  DIM StringStart AS WORD
  ! LES BX, CodeKey$
  ! MOV AX,ES:[BX]
  ! PUSH AX
  ! CALL GetStrLoc          ; find where the data is located
  ! MOV ES, DX              ; put segment in ES
  ! MOV DI, AX              ; put offset in DI
  ! MOV StringStart??,DI
  ! DEC StringStart??
  ! MOV SI,DI
  ! ADD SI,CX               ;SI = end of CodeKey$
  ! DEC SI
  ! MOV CX,256
  ! MOV BX,0
InitKeyStr:
  ! MOV AL,ES:[DI]
  ! MOV KeyBlock?[BX],AL
  ! CMP DI,SI
  ! JNE Skip
  ! MOV DI,StringStart??
  Skip:
  ! INC BX
  ! INC DI
  ! LOOP InitKeyStr
END SUB

SUB EncodeString(PText$,CText$,BYVAL Index%)
LOCAL PTextSeg??,PTextOff??,CTextSeg??,CTextOff??
! LES DI,PText$
! MOV AX,ES:[DI]
! PUSH AX
! CALL GetStrLoc          ; find where the data is located
! MOV ES, DX              ; put segment in ES
! MOV DI, AX              ; put offset in DI
! MOV BX,Index%
! MOV CL,5                ;Multiply AX by 32
! SHL BX,CL
! ADD DI,BX               ;adjust address

! PUSH DS
! LDS SI,CText$
! MOV AX,[SI]
! PUSH AX
! CALL GetStrLoc          ; find where the data is located
! MOV DS, DX              ; put segment in DS
! MOV SI, AX              ; put offset in SI
! ADD SI, BX
! PUSH DS
! PUSH SI

! MOV DX,0
! MOV BX,0
! CLC
SwapBits:
! DB &H26                   ; BT ES:[DI],BX
! DB &H0F                   ; Get bit array value
! DB &HA3
! DB &H1D
! JNC LoopAgain
! MOV DL,ScambleBlock?[BX]  ; if bit array value is set then set scambled bit
! DB &H0F                   ; Bts DS:[SI],DX
! DB &HAB
! DB &H14
LoopAgain:
! INC BX
! CMP BX,256
! Jb SwapBits

! POP DI
! POP ES
! POP DS
! MOV CX,32
EncodeIt:                   ' use RC4 to encrypt block
! PUSH DI
! CALL RC4K
! POP DI
! XOR ES:[DI],AL
! INC DI
! LOOP EncodeIt

EXIT SUB
Rc4K:
 ! MOV AX,RI?
 ! INC AL
 ! MOV RI?,AX
 ! MOV DI,AX
 ! MOV DX,RJ?
 ! ADD DL,SBLOCK?[DI]
 ! MOV SI,DX
 ! MOV RJ? ,DX
 ! MOV BL,SBLOCK?[DI]
 ! MOV BH,SBLOCK?[SI]
 ! MOV SBLOCK?[DI],BH
 ! MOV SBLOCK?[SI],BL
 ! ADD BL,BH
 ! MOV BH,0
 ! MOV AL,SBLOCK?[BX]
 ! RETN
END SUB

SUB DecodeString(CText$,PText$,BYVAL Index%)
LOCAL PTextSeg??,PTextOff??,CTextSeg??,CTextOff??

! LES DI,CText$
! MOV AX,ES:[DI]
! PUSH AX
! CALL GetStrLoc          ; find where the data is located
! MOV ES, DX              ; put segment in ES
! MOV DI, AX              ; put offset in DI
! MOV BX,Index%
! MOV CL,5                ;Multiply Index% by 32
! SHL BX,CL
! ADD DI,BX               ;adjust address

! PUSH BX
! PUSH DI
! MOV CX,32
DecodeIt:                 ' decode using RC4
! PUSH DI
! CALL RC4K
! POP DI
! XOR ES:[DI],AL
! INC DI
! LOOP DecodeIt

! POP DI
! POP BX
! PUSH DS
! LDS SI,PText$
! MOV AX,[SI]
! PUSH AX
! CALL GetStrLoc          ; find where the data is located
! MOV DS, DX              ; put segment in DS
! MOV SI,AX
! ADD SI, BX

! MOV DX,0
! MOV BX,0
! CLC
SwapBits2:                  ' unscrambled bits
! MOV DL,ScambleBlock?[BX]
! DB &H26                 ;BT ES:[DI],DX
! DB &H0F                 ; get bit value of scrambled block
! DB &HA3
! DB &H15
! JNC LoopAgain2
! DB &H0F                ;Bts DS:[SI],BX
! DB &HAB                ; unscramble bit
! DB &H1C
LoopAgain2:
! INC BX
! CMP BX,256
! Jb SwapBits2
! POP DS

END SUB

SBlock:
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KeyBlock:
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ScambleBlock:
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