Announcement

**Henk Broekhuizen** · 11 Oct 2007, 08:58 AM

Small correction

A small logical error was made;

sFileName = "1MBBinary.exe" ' <+++++--------- ** CHANGE THIS **
hFile = FREEFILE ' Save the Declarations
OPEN "1MBBinary.exe" FOR BINARY SHARED AS hFile

the last line logically should read:
OPEN sFileName FOR BINARY SHARED AS hFile

Have fun and Mike thanx for sharing this with us.
Regards,

Henk

**Arthur Gomide** · 16 Oct 2007, 05:19 PM

Same error in 8.03 / 7.04

"Decryption Operation Failed"

**Mike Trader** · 17 Oct 2007, 05:24 PM

Code:

                
' Corrected Padding and added test vectors - NOT confirmed

' RC6 Speed = 550 m/s per Megabyte Encrypt, 530 m/s Decrypt  
                  

'  In cryptography, RC6 is a symmetric key block cipher derived from RC5. 
'  It was designed by Ron Rivest, Matt Robshaw, Ray Sidney, and Yiqun Lisa Yin 
'  to meet the requirements of the Advanced Encryption Standard (AES) competition. 
'  
'  The algorithm was one of the five finalists, and was also submitted to the NESSIE 
'  and CRYPTREC projects. It is a proprietary algorithm, patented by RSA Security.
'   
'  RC6 proper has a block size of 128 bits and supports key sizes of 128, 192 and 256 bits, 
'  but, like RC5, it can be parameterised to support a wide variety of word-lengths, 
'  key sizes and number of rounds. RC6 is very similar to RC5 in structure, 
'  using data-dependent rotations, modular addition and XOR operations; in fact, 
'  RC6 could be viewed as interweaving two parallel RC5 encryption processes. 
'  
'  However, RC6 does use an extra multiplication operation not present in RC5 in 
'  order to make the rotation dependent on every bit in a word, and not just the 
'  least significant few bits.         
'  
'  
'  As RC6 has not been selected for the AES, it is not guaranteed that RC6 
'  is royalty-free. As of January 2007, a web page on the official web site 
'  of the designers of RC6, RSA Laboratories, states the following: 
'  "We emphasize that if RC6 is selected for the AES, RSA Security will 
'  not require any licensing or royalty payments for products using the algorithm". 
'  The emphasis on the word "if" suggests that RSA Security Inc. may now require 
'  licensing and royalty payments for any products using the RC6 algorithm. 
'  RC6 is a patented encryption algorithm        


' RC6, an encryption algorithm designed by Ron Rivest (RSA Labs) and submitted as a candidate algorithm for the
' Advanced Encryption Standard programme of the US National Institute of Standards and Technology."
  
' Ported to PB from "C" by Aleksandr Dobrev - Thanks to wonsky Lu for provide source on C
' Ver. 0.0.1  December 03, 2006 

' Padding and testbed Mike Trader 2007
           
'  The key schedule of RC6-w r bis practically identical to the key schedule of RC5. 
'  The only diference is that more words are derived from the user-supplied key for 
'  use during encryption and decryption. The user supplies a key of b bytes. 
'  Suficient zero bytes are appended to give a key length equal to a non-zero 
'  integral number of words; these key bytes are then loaded in little-endian 
'  fashion into an array of c w-bit words.Thus the first byte of key is stored as 
'  the low-order byte of LO, and is padded with high-order zero bytes if necessary. 
'  Note that if b= 0 then c=1 and L0 = 0. The number ofw-bit words that will be generated 
'  for the additive round keys is 2r+4 and these are stored in the array.
'  http://people.csail.mit.edu/rivest/Rc6.pdf


#COMPILE EXE
#DIM ALL


#INCLUDE "win32api.inc"


%LITTLE_ENDIAN = 1 ' For Little Endian Machines
     


' Utility macros
MACRO zbs(xx) = STRING$(xx, 0) 


MACRO FUNCTION rotr(x,n)
  MACROTEMP s
  DIM s AS DWORD
  s = (x)
  ROTATE RIGHT s,n
END MACRO = s   
           

'#define rotl(x,n)   (((x) << ((INT)((n) & 0x1f))) | ((x) >> ((INT)((32 - ((n) & 0x1f))))))
MACRO FUNCTION rotl(x,n)
   MACROTEMP s
   DIM s AS DWORD
   s = (x)
   ROTATE LEFT s,n
END MACRO = s     
                
                 








' PUT OR GET a 32 BIT WORD (v) IN machine order FROM a BYTE address IN (x)
#IF %DEF(%LITTLE_ENDIAN)
   '#define u4byte_in(x)        (*(u4byte*)(x))
   MACRO FUNCTION u4byte_in(x)
     MACROTEMP pdwZmacro
     DIM pdwZmacro AS DWORD PTR
     pdwZmacro = (x)
   END MACRO = @pdwZmacro
   '#define u4byte_out(x,v)    (*(u4byte*)(x) = (v))
   MACRO u4byte_out(x,v)
     MACROTEMP pdwZmacro
     DIM pdwZmacro AS DWORD PTR
     pdwZmacro = (x)
     @pdwZmacro = v
   END MACRO 

#ELSE
   '#define u4byte_in(x)        bswap(*(u4byte)(x))
   MACRO u4byte_in(x)
     MACROTEMP dwZmacro
     DIM pdwZmacro AS DWORD PTR
     pdwZmacro = (x)
     @pdwZmacro = bswap(@z)
   END MACRO
   '#define u4byte_out(x, v)    (*(u4byte*)(x) = bswap(v))
   MACRO u4byte_out(x, v)
     MACROTEMP pdwZmacro
     DIM pdwZmacro AS DWORD PTR
     pdwZmacro = (x)
     @pdwZmacro = bswap(v)
   END MACRO
#ENDIF



MACRO f_rnd(i,a,b,c,d)
  MACROTEMP u,t
  DIM u AS DWORD,t AS DWORD
        u = rotl(d * (d + d + 1), 5)
        t = rotl(b * (b + b + 1), 5)
        a = rotl(a XOR t, u) + RC6Key(i)
        c = rotl(c XOR u, t) + RC6Key(i + 1)
END MACRO
     

MACRO i_rnd(i,a,b,c,d)
  MACROTEMP u,t
  DIM u AS DWORD,t AS DWORD
        u = rotl(d * (d + d + 1), 5)
        t = rotl(b * (b + b + 1), 5)
        c = rotr(c - RC6Key(i + 1), t) XOR u
        a = rotr(a - RC6Key(i), u) XOR t
END MACRO
       

 

UNION ConvertTwoByteTYPE          ' Converts a Two Byte Value
    str               AS STRING * 02
    igr               AS INTEGER
    wrd               AS WORD 
    byt(1 TO 2)       AS BYTE
END UNION
GLOBAL CvtTwoByte AS ConvertTwoByteTYPE  
       




'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤'
SUB time_stamp_count(tick AS QUAD) ' CPU Clock count    Charles E V Pegge

  '---------------------------'
  '                           ' approx because it is not a serialised instruction
  '                           ' it may execute before or after other instructions
  '                           ' in the pipeline.
  ! mov ebx,tick              ' var address where count is to be stored.
  ! db  &h0f,&h31             ' RDTSC read time-stamp counter into edx:eax hi lo.
  ! mov [ebx],eax             ' save low order 4 bytes.
  ! mov [ebx+4],edx           ' save high order 4 bytes.
  '---------------------------'

END SUB
         

'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤
FUNCTION StrToHex( sBin AS STRING ) AS STRING 
            
  REGISTER i AS LONG, j AS LONG
  LOCAL a, b AS BYTE PTR  
  LOCAL sHex AS STRING
                   
    sHex  = STRING$( LEN(sBin)*2, " " ) ' make a string the right size
    a     = STRPTR(sHex)
    b     = STRPTR(sBin) 
    j     = 0
    FOR i = 0 TO LEN(sBin)-1
      CvtTwoByte.str = HEX$(@b[i],2)  ' NO String concatenation
      @a[j] = CvtTwoByte.byt(1)
      INCR j
      @a[j] = CvtTwoByte.byt(2)
      INCR j
    NEXT i 

  FUNCTION = sHex ' return string

END FUNCTION  

'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤
FUNCTION Hex2Show( sBin AS STRING ) AS STRING  ' For Debugging
            
  REGISTER i AS LONG
  LOCAL t AS STRING
  LOCAL b AS BYTE PTR  

    b = STRPTR(sBin)
    FOR i = 0 TO LEN(sBin)-1
       t = t + HEX$(@b[i],2) + " "  ' String concatenation
    NEXT i 

  FUNCTION = t ' return string

END FUNCTION
             
          
'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤
FUNCTION Show2Hex( sShow AS STRING ) AS STRING  ' Convert to string of Chars with hex values specified
            
  REGISTER i AS LONG
  LOCAL BinLen AS LONG
  LOCAL t AS STRING
  LOCAL b AS BYTE PTR  
                      
    BinLen = PARSECOUNT(sShow, " ") '

    FOR i = 1 TO BinLen 
       t = t + CHR$( VAL("&H"+PARSE$(sShow, " ", i)) )  ' String concatenation 
    NEXT i ' MSGBOX STR$(LEN(t))

  FUNCTION = t ' return string

END FUNCTION



'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤'
' Invert BYTE order IN a 32 BIT variable
'#define bswap(x)    (rotl(x, 8) & 0x00ff00ff | rotr(x, 8) & 0xff00ff00)
FUNCTION bswap( BYVAL dwX AS DWORD ) AS DWORD  

  LOCAL XXdwl,XXdwr AS DWORD

    XXdwl = dwX : XXdwr = dwX
    ROTATE RIGHT XXdwr,8 : XXdwr = XXdwr AND &Hff00ff00???
    ROTATE LEFT  XXdwl,8 : XXdwl = XXdwl AND &H00ff00ff???

  FUNCTION = XXdwl OR XXdwr  

END FUNCTION   

                             
'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤'
' initialise the key schedule FROM the USER supplied key
SUB RC6_set_key( UserKey() AS BYTE, BYVAL key_len AS DWORD, RC6Key() AS DWORD ) 

  LOCAL i, j, k, a, b, t AS DWORD
  DIM l(7) AS DWORD

  REDIM RC6Key(43)  ' STATIC u4byte RC6(l_key[44]);
  RC6Key(0) = &Hb7e15163???

  LOCAL pdwUserKey AS DWORD PTR
  pdwUserKey = VARPTR(UserKey(0))

    k = 1
    WHILE k < 44
        RC6Key(k) = RC6Key(k - 1) + &H9e3779b9???
        INCR k
    WEND

    k = 0
    WHILE k < key_len / 32
        l(k) = u4byte_in(pdwUserKey + (4 * k))
        INCR k
    WEND

    t = (key_len / 32) - 1 ' t = (key_len / 32);

    a = 0: b = 0: i = 0: j = 0

    k = 0
    WHILE k < 132
       a = rotl(RC6Key(i) + a + b, 3): b = b+a
       b = rotl(l(j) + b, b)
       RC6Key(i) = a : l(j) = b
       i = IIF(i = 43, 0, i + 1) ' i = (i + 1) % 44;
       j = IIF(j = t , 0, j + 1) ' j = (j + 1) % t;
       INCR k
    WEND

END SUB
    


'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤'                        
SUB RC6_EnCrypt( BYVAL pdw_InBlk AS DWORD PTR, BYVAL pdw_OutBlk AS DWORD PTR, RC6Key() AS DWORD ) ' encrypt a 16byte block OF TEXT   

  LOCAL  a,b,c,d,t,u AS DWORD    

    a = u4byte_in(pdw_InBlk    ): b = u4byte_in(pdw_InBlk +  4) + RC6Key(0)
    c = u4byte_in(pdw_InBlk + 8): d = u4byte_in(pdw_InBlk + 12) + RC6Key(1)

    f_rnd( 2,a,b,c,d): f_rnd( 4,b,c,d,a)
    f_rnd( 6,c,d,a,b): f_rnd( 8,d,a,b,c)
    f_rnd(10,a,b,c,d): f_rnd(12,b,c,d,a)
    f_rnd(14,c,d,a,b): f_rnd(16,d,a,b,c)
    f_rnd(18,a,b,c,d): f_rnd(20,b,c,d,a)
    f_rnd(22,c,d,a,b): f_rnd(24,d,a,b,c)
    f_rnd(26,a,b,c,d): f_rnd(28,b,c,d,a)
    f_rnd(30,c,d,a,b): f_rnd(32,d,a,b,c)
    f_rnd(34,a,b,c,d): f_rnd(36,b,c,d,a)
    f_rnd(38,c,d,a,b): f_rnd(40,d,a,b,c)

    u4byte_out(pdw_OutBlk,     a + RC6Key(42))  : u4byte_out(pdw_OutBlk +  4, b)
    u4byte_out(pdw_OutBlk + 8, c + RC6Key(43))  : u4byte_out(pdw_OutBlk + 12, d)

END SUB
                

     
'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤'
SUB RC6_DeCrypt( BYVAL pdw_InBlk AS DWORD PTR, BYVAL pdw_OutBlk AS DWORD PTR, RC6Key() AS DWORD ) ' decrypt a 16byte block OF TEXT 

  LOCAL  a,b,c,d,t,u AS DWORD

    d = u4byte_in(pdw_InBlk + 12): c = u4byte_in(pdw_InBlk + 8) - RC6Key(43)
    b = u4byte_in(pdw_InBlk +  4): a = u4byte_in(pdw_InBlk    ) - RC6Key(42)

    i_rnd(40,d,a,b,c): i_rnd(38,c,d,a,b)
    i_rnd(36,b,c,d,a): i_rnd(34,a,b,c,d)
    i_rnd(32,d,a,b,c): i_rnd(30,c,d,a,b)
    i_rnd(28,b,c,d,a): i_rnd(26,a,b,c,d)
    i_rnd(24,d,a,b,c): i_rnd(22,c,d,a,b)
    i_rnd(20,b,c,d,a): i_rnd(18,a,b,c,d)
    i_rnd(16,d,a,b,c): i_rnd(14,c,d,a,b)
    i_rnd(12,b,c,d,a): i_rnd(10,a,b,c,d)
    i_rnd( 8,d,a,b,c): i_rnd( 6,c,d,a,b)
    i_rnd( 4,b,c,d,a): i_rnd( 2,a,b,c,d)

    u4byte_out(pdw_OutBlk + 12, d - RC6Key(1)) : u4byte_out(pdw_OutBlk + 8, c)
    u4byte_out(pdw_OutBlk +  4, b - RC6Key(0)) : u4byte_out(pdw_OutBlk,     a)  

END SUB




'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤'
FUNCTION PBMAIN() AS LONG  

  DIM RC6Key(0) AS STATIC DWORD
  LOCAL KeyLen, SrcLen AS LONG
        
  LOCAL sKey, sFile, sCipher, t, sFileName, sTestFile, sTestKey, sTestCipher AS STRING 
  LOCAL FileLen, i, k, hFile, PadLen, RetVal, nLoops, nBlocks, ExtraBytes AS LONG
  LOCAL PerfFreq, t1, t2 AS QUAD  
  LOCAL cBeg, cEnd AS QUAD 
  LOCAL Elapsed AS SINGLE

  LOCAL pIn, pOut AS BYTE PTR


                    
    RetVal = QueryPerformanceFrequency(PerfFreq) ' Checkhardware supports High Resolution Timer
           

    sFile = "Low voltage cutoff should not be of great concern to the average user." ' Default   

    sFileName = "1MBBinary.exe" ' <+++++++++++++++++++++++++++++++++++-----------------------  **   CHANGE THIS   ** 
    hFile = FREEFILE ' Save the Declarations
    OPEN "1MBBinary.exe" FOR BINARY SHARED AS hFile 
      IF ERR THEN MSGBOX "Problem opening file to be encrypted",48,"File Error"+STR$(ERRCLEAR)
      GET$ #hFile, LOF(hFile), sFile
    CLOSE hFile ' 
             
                   
'          "12345678901234567890123456789012"          
    sKey = "RC6SixteenByteKe" 




'    sTestFile   = "00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00"
'    sTestKey    = "00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00"
'    sTestCipher = "8f c3 a5 36 56 b1 f7 78 c1 29 df 4e 98 48 a4 1e"
                                                         
    sTestFile   = "02 13 24 35 46 57 68 79 8a 9b ac bd ce df e0 f1"
    sTestKey    = "01 23 45 67 89 ab cd ef 01 12 23 34 45 56 67 78"
    sTestCipher = "52 4e 19 2f 47 15 c6 23 1f 51 f6 36 7e a4 3f 18"
                                                       
'    sTestFile   = "00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00"
'    sTestKey    = "00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00"
'    sTestCipher = "6c d6 1b cb 19 0b 30 38 4e 8a 3f 16 86 90 ae 82"

'    sTestFile   = "02 13 24 35 46 57 68 79 8a 9b ac bd ce df e0 f1"
'    sTestKey    = "01 23 45 67 89 ab cd ef 01 12 23 34 45 56 67 78 89 9a ab bc cd de ef f0"
'    sTestCipher = "68 83 29 d0 19 e5 05 04 1e 52 e9 2a f9 52 91 d4"

'    sTestFile   = "00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00"
'    sTestKey    = "00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00"
'    sTestCipher = "8f 5f bd 05 10 d1 5f a8 93 fa 3f da 6e 85 7e c2"

'    sTestFile   = "02 13 24 35 46 57 68 79 8a 9b ac bd ce df e0 f1"
'    sTestKey    = "01 23 45 67 89 ab cd ef 01 12 23 34 45 56 67 78 89 9a ab bc cd de ef f0 10 32 54 76 98 ba dc fe"
'    sTestCipher = "c8 24 18 16 f0 d7 e4 89 20 ad 16 a1 67 4e 5d 48"  



    sFile   = Show2Hex(sTestFile)
    sKey    = Show2Hex(sTestKey) ' MSGBOX sKey + $CRLF + Hex2Show( Show2Hex(sKey) )

                


    t = t + Hex2Show(sFile) + $CRLF + $CRLF   ' COMMENT OUT FOR BINARY FILE **************  

    SrcLen = LEN(sFile)
    t = t + "Input File length :" + STR$(SrcLen) + $CRLF  
               


              
    nLoops = 1 ' 999 for short string
            
    KeyLen = LEN(sKey) 
    t = t + "Key length:" + STR$(KeyLen) + " (max=32)" + $CRLF 

    DIM UserKey(KeyLen) AS STATIC BYTE
    POKE$ VARPTR(UserKey(0)), sKey  ' string to byte array
 
    RC6_set_key( UserKey(), KeyLen, RC6Key() ) ' Create password based key for crypt and decrypt

        

    t = t + sTestKey  + $CRLF
    t = t + Hex2Show(sKey)  + $CRLF + $CRLF
    t = t + "Input File: '"+sFileName+"', length=" + STR$(LEN(sFile)) + $CRLF   

                     

    ExtraBytes = SrcLen MOD 16 ' MSGBOX STR$(ExtraBytes)
    IF ExtraBytes THEN PadLen = 16 - ExtraBytes ELSE PadLen = 0  

    t = t + "PadLen :" + STR$(PadLen) + $CRLF

    nBlocks = (SrcLen+PadLen) / 16
    t = t + "nBlocks :" + STR$(nBlocks) + $CRLF

      
    sFile = sFile + zbs(LEN(PadLen))
              
    sCipher = zbs(SrcLen+PadLen) '

    t = t + "Cipher length :" + STR$(LEN(sCipher)) + $CRLF

    pIn  = STRPTR(sFile)
    pOut = STRPTR(sCipher)           

            

        

' ----------------------------------------------------------  Encoding sCipher
    QueryPerformanceCounter t1 

    time_stamp_count(cBeg) ' measuring cpu clock cycles. The overhead just for making this call is about 25 clocks         
    FOR i = 1 TO nLoops 
      FOR k = 0 TO (nBlocks-1)*16 STEP 16
        RC6_EnCrypt( pIn+k, pOut+k, RC6Key() )
      NEXT
    NEXT
    time_stamp_count(cEnd) ' measuring cpu clock cycles. The overhead just for making this call is about 25 clocks
    t = t + "Encrypt Clock Cycles="+STR$( (cEnd-cBeg)\nLoops ) + $CRLF 
      
    sCipher = sCipher + CHR$(PadLen) ' byte array to string  
                                            
    QueryPerformanceCounter t2 : Elapsed = (t2-t1)/PerfFreq*1000 ' m/s 

    sFile = "" ' Burn the Input.  
    t = t + "Encrypted in:"+STR$(Elapsed)+" m/s" + $CRLF + $CRLF 

    t = t + "Known Cipher:" + $CRLF  
   t = t + sTestCipher + $CRLF + $CRLF 
                
    t = t + "Calculated Cipher length :" + STR$(LEN(sCipher)) + $CRLF 
   t = t + Hex2Show(sCipher) + $CRLF + $CRLF + $CRLF ' COMMENT OUT FOR BINARY FILE **************   
                         
      




' ----------------------------------------------------------  Decoding sCipher
    QueryPerformanceCounter t1 
         
    PadLen = ASC(RIGHT$(sCipher, 1))
    t = t + "Recovered PadLen :" + STR$(PadLen) + $CRLF
       
    SrcLen = LEN(sCipher) - 1
            
    nBlocks = SrcLen / 16
    t = t + "Recovered nBlocks :" + STR$(nBlocks) + $CRLF

    sFile = zbs(SrcLen)

    pIn  = STRPTR(sCipher)
    pOut = STRPTR(sFile)


     
    time_stamp_count(cBeg) ' measuring cpu clock cycles. The overhead just for making this call is about 25 clocks 
    FOR i = 1 TO nLoops  
      FOR k = 0 TO (nBlocks-1)*16 STEP 16
        RC6_DeCrypt( pIn+k, pOut+k, RC6Key() )
      NEXT
    NEXT   
    time_stamp_count(cEnd) ' measuring cpu clock cycles. The overhead just for making this call is about 25 clocks
    t = t + "Decrypt Clock Cycles="+STR$( (cEnd-cBeg)\nLoops ) + $CRLF 

    sFile = LEFT$(sFile, SrcLen-PadLen) ' convert byte array to string
    IF sFile = "" THEN MSGBOX "Decryption Operation Failed",64,"RC6" : EXIT FUNCTION

    QueryPerformanceCounter t2 : Elapsed = (t2-t1)/PerfFreq*1000 ' m/s    

    sCipher = "" ' Burn the Cipher 
    t = t + "Decrypted File length :" + STR$(LEN(sFile)) + $CRLF  

    t = t + "Decrypt Completed in:"+STR$(Elapsed)+" m/s" + $CRLF + $CRLF  
   t = t + Hex2Show(sFile) + $CRLF ' COMMENT OUT FOR BINARY FILE **************

    MSGBOX t,64,"RC6 Encryption"  


END FUNCTION
'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤'

**John Gleason** · 18 Oct 2007, 08:14 PM

Code:

'======================================================================================================
' Mike Trader, there is/was an error in the RC6 algorithm you posted previously, as fully 1/2 of the
' equations like u = rotl(d * (d + d + 1), 5) thunk to zero because they exceed the size of a DWORD.
' I'm certain Ron Rivest did not intend that to happen by design. This is probably just an exact copy
' of the code Aleksandr Dobrev posted from the C port, so the mistake may go back a ways. I fixed the
' code below to do the multiplication correctly, but this fixed version will no longer work with any
' file encoded with the old version. I have a new optimized version of this fixed RC6 algo that is
' many times faster, and some may find it of interest so will link to from here in a day or two.
' Oct. 21, 07, John Gleason
' Discussion here:[URL="http://www.powerbasic.com/support/pbforums/showthread.php?t=35257"]http://www.powerbasic.com/support/pbforums/showthread.php?t=35257[/URL]
'======================================================================================================

'  In cryptography, RC6 is a symmetric key block cipher derived from RC5.
'  It was designed by Ron Rivest, Matt Robshaw, Ray Sidney, and Yiqun Lisa Yin
'  to meet the requirements of the Advanced Encryption Standard (AES) competition.
'
'  The algorithm was one of the five finalists, and was also submitted to the NESSIE
'  and CRYPTREC projects. It is a proprietary algorithm, patented by RSA Security.
'
'  RC6 proper has a block size of 128 bits and supports key sizes of 128, 192 and 256 bits,
'  but, like RC5, it can be parameterised to support a wide variety of word-lengths,
'  key sizes and number of rounds. RC6 is very similar to RC5 in structure,
'  using data-dependent rotations, modular addition and XOR operations; in fact,
'  RC6 could be viewed as interweaving two parallel RC5 encryption processes.
'
'  However, RC6 does use an extra multiplication operation not present in RC5 in
'  order to make the rotation dependent on every bit in a word, and not just the
'  least significant few bits.
'
'
'  As RC6 has not been selected for the AES, it is not guaranteed that RC6
'  is royalty-free. As of January 2007, a web page on the official web site
'  of the designers of RC6, RSA Laboratories, states the following:
'  "We emphasize that if RC6 is selected for the AES, RSA Security will
'  not require any licensing or royalty payments for products using the algorithm".
'  The emphasis on the word "if" suggests that RSA Security Inc. may now require
'  licensing and royalty payments for any products using the RC6 algorithm.
'  RC6 is a patented encryption algorithm


' RC6, an encryption algorithm designed by Ron Rivest (RSA Labs) and submitted as a candidate algorithm for the
' Advanced Encryption Standard programme of the US National Institute of Standards and Technology."

' Ported to PB from "C" by Aleksandr Dobrev - Thanks to wonsky Lu for provide source on C
' Ver. 0.0.1  December 03, 2006

' Padding and testbed Mike Trader 2007


#COMPILE EXE
#DIM ALL


#INCLUDE "win32api.inc"


%LITTLE_ENDIAN = 1 ' For Little Endian Machines



' Utility macros
MACRO zbs(xx) = STRING$(xx, 0)


MACRO FUNCTION rotr(x,n)
   MACROTEMP s
   LOCAL s AS DWORD
   s = x
  ROTATE RIGHT s,n
END MACRO = s


'#define rotl(x,n)   (((x) << ((INT)((n) & 0x1f))) | ((x) >> ((INT)((32 - ((n) & 0x1f))))))
MACRO FUNCTION rotl(x,n)
   MACROTEMP s
   LOCAL s AS DWORD
   s = x
   ROTATE LEFT s,n
END MACRO = s

' PUT OR GET a 32 BIT WORD (v) IN machine order FROM a BYTE address IN (x)
#IF %DEF(%LITTLE_ENDIAN)
   '#define u4byte_in(x)        (*(u4byte*)(x))
   MACRO FUNCTION u4byte_in(x)
     MACROTEMP pdwZmacro
     DIM pdwZmacro AS DWORD PTR
     pdwZmacro = (x)
   END MACRO = @pdwZmacro
   '#define u4byte_out(x,v)    (*(u4byte*)(x) = (v))
   MACRO u4byte_out(x,v)
     MACROTEMP pdwZmacro
     DIM pdwZmacro AS DWORD PTR
     pdwZmacro = (x)
     @pdwZmacro = v
   END MACRO

#ELSE
   '#define u4byte_in(x)        bswap(*(u4byte)(x))
   MACRO u4byte_in(x)
     MACROTEMP dwZmacro
     DIM pdwZmacro AS DWORD PTR
     pdwZmacro = (x)
     @pdwZmacro = bswap(@z)
   END MACRO
   '#define u4byte_out(x, v)    (*(u4byte*)(x) = bswap(v))
   MACRO u4byte_out(x, v)
     MACROTEMP pdwZmacro
     DIM pdwZmacro AS DWORD PTR
     pdwZmacro = (x)
     @pdwZmacro = bswap(v)
   END MACRO
#ENDIF



MACRO f_rnd(i,a,b,c,d)                  'here's the section I modified to fix an error----(John Gleason)--------------------
  MACROTEMP u,t
  DIM u AS DWORD,t AS DWORD
        u = d
        BIT RESET u, 31                 'if top bit of d is 1, set top bit to zero, or u will go out of range and reset to 0.
        u = rotl(u * (u + u + 1), 5)    'previously was: u = rotl(d * (d + d + 1), 5)
        t = b
        BIT RESET t, 31                 'if top bit of b is 1, set top bit to zero, or t will go out of range and reset to 0.
        t = rotl(t * (t + t + 1), 5)    'previously was: t = rotl(b * (b + b + 1), 5)
        a = rotl(a XOR t, u) + RC6Key(i)
        c = rotl(c XOR u, t) + RC6Key(i + 1)
END MACRO


MACRO i_rnd(i,a,b,c,d)
  MACROTEMP u,t
  DIM u AS DWORD,t AS DWORD
        u = d
        BIT RESET u, 31                 'if top bit of d is 1, set top bit to zero, or u will go out of range and reset to 0.
        u = rotl(u * (u + u + 1), 5)    'previously was: u = rotl(d * (d + d + 1), 5)
        t = b
        BIT RESET t, 31                 'if top bit of b is 1, set top bit to zero, or t will go out of range and reset to 0.
        t = rotl(t * (t + t + 1), 5)    'previously was: t = rotl(b * (b + b + 1), 5)
        c = rotr(c - RC6Key(i + 1), t) XOR u
        a = rotr(a - RC6Key(i), u) XOR t
END MACRO                               'end of the section I modified to fix an error--------------------------------------




UNION ConvertTwoByteTYPE          ' Converts a Two Byte Value
    str               AS STRING * 02
    igr               AS INTEGER
    wrd               AS WORD
    byt(1 TO 2)       AS BYTE
END UNION
GLOBAL CvtTwoByte AS ConvertTwoByteTYPE





'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤'
SUB time_stamp_count(tick AS QUAD) ' CPU Clock count    Charles E V Pegge

  '---------------------------'
  '                           ' approx because it is not a serialised instruction
  '                           ' it may execute before or after other instructions
  '                           ' in the pipeline.
  ! mov ebx,tick              ' var address where count is to be stored.
  ! db  &h0f,&h31             ' RDTSC read time-stamp counter into edx:eax hi lo.
  ! mov [ebx],eax             ' save low order 4 bytes.
  ! mov [ebx+4],edx           ' save high order 4 bytes.
  '---------------------------'

END SUB


'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤
FUNCTION StrToHex( sBin AS STRING ) AS STRING

  REGISTER i AS LONG, j AS LONG
  LOCAL a, b AS BYTE PTR
  LOCAL sHex AS STRING

    sHex  = STRING$( LEN(sBin)*2, " " ) ' make a string the right size
    a     = STRPTR(sHex)
    b     = STRPTR(sBin)
    j     = 0
    FOR i = 0 TO LEN(sBin)-1
      CvtTwoByte.str = HEX$(@b[i],2)  ' NO String concatenation
      @a[j] = CvtTwoByte.byt(1)
      INCR j
      @a[j] = CvtTwoByte.byt(2)
      INCR j
    NEXT i

  FUNCTION = sHex ' return string

END FUNCTION


'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤'
' Invert BYTE order IN a 32 BIT variable
'#define bswap(x)    (rotl(x, 8) & 0x00ff00ff | rotr(x, 8) & 0xff00ff00)
FUNCTION bswap( BYVAL dwX AS DWORD ) AS DWORD

  LOCAL XXdwl,XXdwr AS DWORD
    ? "yow"
    XXdwl = dwX : XXdwr = dwX
    ROTATE RIGHT XXdwr,8 : XXdwr = XXdwr AND &Hff00ff00???
    ROTATE LEFT  XXdwl,8 : XXdwl = XXdwl AND &H00ff00ff???

  FUNCTION = XXdwl OR XXdwr

END FUNCTION


'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤'
' initialise the key schedule FROM the USER supplied key
SUB RC6_set_key( UserKey() AS BYTE, BYVAL key_len AS DWORD, RC6Key() AS DWORD )

  LOCAL i, j, k, a, b, t AS DWORD
  DIM l(7) AS DWORD

  REDIM RC6Key(43)  ' STATIC u4byte RC6(l_key[44]);
  RC6Key(0) = &Hb7e15163???

  LOCAL pdwUserKey AS DWORD PTR
  pdwUserKey = VARPTR(UserKey(0))

    k = 1
    WHILE k < 44
        RC6Key(k) = RC6Key(k - 1) + &H9e3779b9???
        INCR k
    WEND

    k = 0
    WHILE k < key_len / 32
        l(k) = u4byte_in(pdwUserKey + (4 * k))
        INCR k
    WEND

    t = (key_len / 32) - 1 ' t = (key_len / 32);

    a = 0: b = 0: i = 0: j = 0

    k = 0
    WHILE k < 132
       a = rotl(RC6Key(i) + a + b, 3): b = b+a
       b = rotl(l(j) + b, b)
       RC6Key(i) = a : l(j) = b
       i = IIF(i = 43, 0, i + 1) ' i = (i + 1) % 44;
       j = IIF(j = t , 0, j + 1) ' j = (j + 1) % t;
       INCR k
    WEND

END SUB



'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤'
SUB RC6_EnCrypt( BYVAL pdw_InBlk AS DWORD PTR, BYVAL pdw_OutBlk AS DWORD PTR, RC6Key() AS DWORD ) ' encrypt a 16byte block OF TEXT

  LOCAL  a,b,c,d,t,u AS DWORD

    a = u4byte_in(pdw_InBlk    ): b = u4byte_in(pdw_InBlk +  4) + RC6Key(0)
    c = u4byte_in(pdw_InBlk + 8): d = u4byte_in(pdw_InBlk + 12) + RC6Key(1)

    f_rnd( 2,a,b,c,d): f_rnd( 4,b,c,d,a)
    f_rnd( 6,c,d,a,b): f_rnd( 8,d,a,b,c)
    f_rnd(10,a,b,c,d): f_rnd(12,b,c,d,a)
    f_rnd(14,c,d,a,b): f_rnd(16,d,a,b,c)
    f_rnd(18,a,b,c,d): f_rnd(20,b,c,d,a)
    f_rnd(22,c,d,a,b): f_rnd(24,d,a,b,c)
    f_rnd(26,a,b,c,d): f_rnd(28,b,c,d,a)
    f_rnd(30,c,d,a,b): f_rnd(32,d,a,b,c)
    f_rnd(34,a,b,c,d): f_rnd(36,b,c,d,a)
    f_rnd(38,c,d,a,b): f_rnd(40,d,a,b,c)

    u4byte_out(pdw_OutBlk,     a + RC6Key(42))  : u4byte_out(pdw_OutBlk +  4, b)
    u4byte_out(pdw_OutBlk + 8, c + RC6Key(43))  : u4byte_out(pdw_OutBlk + 12, d)

END SUB



'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤'
SUB RC6_DeCrypt( BYVAL pdw_InBlk AS DWORD PTR, BYVAL pdw_OutBlk AS DWORD PTR, RC6Key() AS DWORD ) ' decrypt a 16byte block OF TEXT

  LOCAL  a,b,c,d,t,u AS DWORD

    d = u4byte_in(pdw_InBlk + 12): c = u4byte_in(pdw_InBlk + 8) - RC6Key(43)
    b = u4byte_in(pdw_InBlk +  4): a = u4byte_in(pdw_InBlk    ) - RC6Key(42)

    i_rnd(40,d,a,b,c): i_rnd(38,c,d,a,b)
    i_rnd(36,b,c,d,a): i_rnd(34,a,b,c,d)
    i_rnd(32,d,a,b,c): i_rnd(30,c,d,a,b)
    i_rnd(28,b,c,d,a): i_rnd(26,a,b,c,d)
    i_rnd(24,d,a,b,c): i_rnd(22,c,d,a,b)
    i_rnd(20,b,c,d,a): i_rnd(18,a,b,c,d)
    i_rnd(16,d,a,b,c): i_rnd(14,c,d,a,b)
    i_rnd(12,b,c,d,a): i_rnd(10,a,b,c,d)
    i_rnd( 8,d,a,b,c): i_rnd( 6,c,d,a,b)
    i_rnd( 4,b,c,d,a): i_rnd( 2,a,b,c,d)

    u4byte_out(pdw_OutBlk + 12, d - RC6Key(1)) : u4byte_out(pdw_OutBlk + 8, c)
    u4byte_out(pdw_OutBlk +  4, b - RC6Key(0)) : u4byte_out(pdw_OutBlk,     a)

END SUB




'¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤'
FUNCTION PBMAIN() AS LONG

  DIM RC6Key(0) AS STATIC DWORD
  LOCAL KeyLen, SrcLen AS LONG

  LOCAL sKey, sFile, sCipher, t, sFileName AS STRING
  LOCAL FileLen, i, k, hFile, PadLen, RetVal, nLoops, nBlocks AS LONG
  LOCAL PerfFreq, t1, t2 AS QUAD
  LOCAL cBeg, cEnd AS QUAD
  LOCAL Elapsed AS SINGLE

  LOCAL pIn, pOut AS BYTE PTR



    RetVal = QueryPerformanceFrequency(PerfFreq) ' Checkhardware supports High Resolution Timer


    sFile = "Low voltage cutoff should not be of great concern to the average user." ' Default
                '
    sFileName = "D:\fileToEncrypt.AVI" ' <+++++++++++++++++++++++++++++++++++-----------------------  **   CHANGE THIS   **
    hFile = FREEFILE ' Save the Declarations
    OPEN sFileName FOR BINARY SHARED AS hFile
      IF ERR THEN MSGBOX "Problem opening file to be encrypted",48,"File Error"+STR$(ERRCLEAR)
      GET$ #hFile, LOF(hFile), sFile
    CLOSE hFile '



'    t = t + LEFT$(sFile,80) + $CRLF + $CRLF   ' COMMENT OUT FOR BINARY FILE **************

    SrcLen = LEN(sFile)
    t = t + "Input File length :" + STR$(SrcLen) + $CRLF


'          "12345678901234567890123456789012"
    sKey = "RC6SixteenByteKe"

    nLoops = 1 ' 999 for short string

    KeyLen = LEN(sKey)
    t = t + "Key length:" + STR$(KeyLen) + " (max=32)" + $CRLF

    DIM UserKey(KeyLen) AS STATIC BYTE
    POKE$ VARPTR(UserKey(0)), sKey  ' string to byte array

    RC6_set_key( UserKey(), KeyLen, RC6Key() ) ' Create password based key for crypt and decrypt




    t = t + sKey  + $CRLF + $CRLF
    t = t + "Input File: '"+sFileName+"', length=" + STR$(LEN(sFile)) + $CRLF




    PadLen = 16 - (SrcLen MOD 16)
    t = t + "PadLen :" + STR$(PadLen) + $CRLF

    nBlocks = (SrcLen+PadLen) / 16
    t = t + "nBlocks :" + STR$(nBlocks) + $CRLF


    sFile = sFile + zbs(LEN(PadLen))

    sCipher = zbs(SrcLen+PadLen) '

    t = t + "Cipher length :" + STR$(LEN(sCipher)) + $CRLF

    pIn  = STRPTR(sFile)
    pOut = STRPTR(sCipher)





' ----------------------------------------------------------  Encoding sCipher
    QueryPerformanceCounter t1

    time_stamp_count(cBeg) ' measuring cpu clock cycles. The overhead just for making this call is about 25 clocks
    FOR i = 1 TO nLoops
      FOR k = 0 TO (nBlocks-1)*16 STEP 16
        RC6_EnCrypt( pIn+k, pOut+k, RC6Key() )
      NEXT
    NEXT
    time_stamp_count(cEnd) ' measuring cpu clock cycles. The overhead just for making this call is about 25 clocks
    t = t + "Encrypt Clock Cycles="+STR$( (cEnd-cBeg)\nLoops ) + $CRLF

    sCipher = sCipher + CHR$(PadLen) ' byte array to string

    QueryPerformanceCounter t2 : Elapsed = (t2-t1)/PerfFreq*1000 ' m/s

    t = t + "Encrypted in:"+STR$(Elapsed)+" m/s" + $CRLF
    t = t + "Encrypt Clock Cycles per Byte:"+STR$((cEnd-cBeg)\nLoops\LEN(sFile))+" c/b" + $CRLF + $CRLF
    sFile = "" ' Burn the Input.
    t = t + "Cipher length :" + STR$(LEN(sCipher)) + $CRLF



' ----------------------------------------------------------  Decoding sCipher
    QueryPerformanceCounter t1

    PadLen = ASC(RIGHT$(sCipher, 1))
    t = t + "Recovered PadLen :" + STR$(PadLen) + $CRLF

    SrcLen = LEN(sCipher) - 1

    nBlocks = SrcLen / 16
    t = t + "Recovered nBlocks :" + STR$(nBlocks) + $CRLF

    sFile = zbs(SrcLen)

    pIn  = STRPTR(sCipher)
    pOut = STRPTR(sFile)



    time_stamp_count(cBeg) ' measuring cpu clock cycles. The overhead just for making this call is about 25 clocks
    FOR i = 1 TO nLoops
      FOR k = 0 TO (nBlocks-1)*16 STEP 16
        RC6_DeCrypt( pIn+k, pOut+k, RC6Key() )
      NEXT
    NEXT
    time_stamp_count(cEnd) ' measuring cpu clock cycles. The overhead just for making this call is about 25 clocks
    t = t + "Decrypt Clock Cycles="+STR$( (cEnd-cBeg)\nLoops ) + $CRLF

    sFile = LEFT$(sFile, SrcLen-PadLen) ' convert byte array to string
    IF sFile = "" THEN MSGBOX "Decryption Operation Failed",64,"RC6" : EXIT FUNCTION

    QueryPerformanceCounter t2 : Elapsed = (t2-t1)/PerfFreq*1000 ' m/s

    sCipher = "" ' Burn the Cipher
    t = t + "Decrypted File length :" + STR$(LEN(sFile)) + $CRLF

    t = t + "Decrypt Completed in:"+STR$(Elapsed)+" m/s" + $CRLF
    t = t + "Decrypt Clock Cycles per Byte:"+STR$((cEnd-cBeg)\nLoops\LEN(sFile))+" c/b" + $CRLF+ $CRLF

    MSGBOX t,64,"RC6 Encryption"


END FUNCTION

**Mike Trader** · 22 Oct 2007, 01:59 PM

see:

Problem with the RC6 algorithm in Source Code Forum - PowerBASIC Peer Support Community

http://www.powerbasic.com/support/pbforums/showthread.php?t=35257

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