gost.c

BestCrypt开源加密原代码

/*
#ifndef __WIN95__
#include <windef.h>
#else
#include <basedef.h>
#endif

*/
#include "bc_gost.h"

// *********** GOST Encryption Data ***********

BYTE Table[] = {
	0xfb, 0xfc, 0xf1, 0xfa, 0xf7, 0xfe, 0xf2, 0xfd, 0xf3, 0xff, 0xf0, 0xf5, 0xf8, 0xf4, 0xf9, 0xf6,
    0xcb, 0xcc, 0xc1, 0xca, 0xc7, 0xce, 0xc2, 0xcd, 0xc3, 0xcf, 0xc0, 0xc5, 0xc8, 0xc4, 0xc9, 0xc6,
    0x6b, 0x6c, 0x61, 0x6a, 0x67, 0x6e, 0x62, 0x6d, 0x63, 0x6f, 0x60, 0x65, 0x68, 0x64, 0x69, 0x66,
    0xab, 0xac, 0xa1, 0xaa, 0xa7, 0xae, 0xa2, 0xad, 0xa3, 0xaf, 0xa0, 0xa5, 0xa8, 0xa4, 0xa9, 0xa6,
    0x7b, 0x7c, 0x71, 0x7a, 0x77, 0x7e, 0x72, 0x7d, 0x73, 0x7f, 0x70, 0x75, 0x78, 0x74, 0x79, 0x76,
    0xdb, 0xdc, 0xd1, 0xda, 0xd7, 0xde, 0xd2, 0xdd, 0xd3, 0xdf, 0xd0, 0xd5, 0xd8, 0xd4, 0xd9, 0xd6,
    0x0b, 0x0c, 0x01, 0x0a, 0x07, 0x0e, 0x02, 0x0d, 0x03, 0x0f, 0x00, 0x05, 0x08, 0x04, 0x09, 0x06,
    0x8b, 0x8c, 0x81, 0x8a, 0x87, 0x8e, 0x82, 0x8d, 0x83, 0x8f, 0x80, 0x85, 0x88, 0x84, 0x89, 0x86,
    0x5b, 0x5c, 0x51, 0x5a, 0x57, 0x5e, 0x52, 0x5d, 0x53, 0x5f, 0x50, 0x55, 0x58, 0x54, 0x59, 0x56,
    0x3b, 0x3c, 0x31, 0x3a, 0x37, 0x3e, 0x32, 0x3d, 0x33, 0x3f, 0x30, 0x35, 0x38, 0x34, 0x39, 0x36,
    0xbb, 0xbc, 0xb1, 0xba, 0xb7, 0xbe, 0xb2, 0xbd, 0xb3, 0xbf, 0xb0, 0xb5, 0xb8, 0xb4, 0xb9, 0xb6,
    0x2b, 0x2c, 0x21, 0x2a, 0x27, 0x2e, 0x22, 0x2d, 0x23, 0x2f, 0x20, 0x25, 0x28, 0x24, 0x29, 0x26,
    0x4b, 0x4c, 0x41, 0x4a, 0x47, 0x4e, 0x42, 0x4d, 0x43, 0x4f, 0x40, 0x45, 0x48, 0x44, 0x49, 0x46,
    0xeb, 0xec, 0xe1, 0xea, 0xe7, 0xee, 0xe2, 0xed, 0xe3, 0xef, 0xe0, 0xe5, 0xe8, 0xe4, 0xe9, 0xe6,
    0x1b, 0x1c, 0x11, 0x1a, 0x17, 0x1e, 0x12, 0x1d, 0x13, 0x1f, 0x10, 0x15, 0x18, 0x14, 0x19, 0x16,
    0x9b, 0x9c, 0x91, 0x9a, 0x97, 0x9e, 0x92, 0x9d, 0x93, 0x9f, 0x90, 0x95, 0x98, 0x94, 0x99, 0x96,
    0xd6, 0xdd, 0xda, 0xd2, 0xd4, 0xd9, 0xd1, 0xd5, 0xdc, 0xd7, 0xd0, 0xd8, 0xd3, 0xdf, 0xde, 0xdb,
    0xe6, 0xed, 0xea, 0xe2, 0xe4, 0xe9, 0xe1, 0xe5, 0xec, 0xe7, 0xe0, 0xe8, 0xe3, 0xef, 0xee, 0xeb,
    0xa6, 0xad, 0xaa, 0xa2, 0xa4, 0xa9, 0xa1, 0xa5, 0xac, 0xa7, 0xa0, 0xa8, 0xa3, 0xaf, 0xae, 0xab,
    0xb6, 0xbd, 0xba, 0xb2, 0xb4, 0xb9, 0xb1, 0xb5, 0xbc, 0xb7, 0xb0, 0xb8, 0xb3, 0xbf, 0xbe, 0xbb,
    0xf6, 0xfd, 0xfa, 0xf2, 0xf4, 0xf9, 0xf1, 0xf5, 0xfc, 0xf7, 0xf0, 0xf8, 0xf3, 0xff, 0xfe, 0xfb,
    0x56, 0x5d, 0x5a, 0x52, 0x54, 0x59, 0x51, 0x55, 0x5c, 0x57, 0x50, 0x58, 0x53, 0x5f, 0x5e, 0x5b,
    0x36, 0x3d, 0x3a, 0x32, 0x34, 0x39, 0x31, 0x35, 0x3c, 0x37, 0x30, 0x38, 0x33, 0x3f, 0x3e, 0x3b,
    0xc6, 0xcd, 0xca, 0xc2, 0xc4, 0xc9, 0xc1, 0xc5, 0xcc, 0xc7, 0xc0, 0xc8, 0xc3, 0xcf, 0xce, 0xcb,
    0x16, 0x1d, 0x1a, 0x12, 0x14, 0x19, 0x11, 0x15, 0x1c, 0x17, 0x10, 0x18, 0x13, 0x1f, 0x1e, 0x1b,
    0x26, 0x2d, 0x2a, 0x22, 0x24, 0x29, 0x21, 0x25, 0x2c, 0x27, 0x20, 0x28, 0x23, 0x2f, 0x2e, 0x2b,
    0x06, 0x0d, 0x0a, 0x02, 0x04, 0x09, 0x01, 0x05, 0x0c, 0x07, 0x00, 0x08, 0x03, 0x0f, 0x0e, 0x0b,
    0x76, 0x7d, 0x7a, 0x72, 0x74, 0x79, 0x71, 0x75, 0x7c, 0x77, 0x70, 0x78, 0x73, 0x7f, 0x7e, 0x7b,
    0x46, 0x4d, 0x4a, 0x42, 0x44, 0x49, 0x41, 0x45, 0x4c, 0x47, 0x40, 0x48, 0x43, 0x4f, 0x4e, 0x4b,
    0x86, 0x8d, 0x8a, 0x82, 0x84, 0x89, 0x81, 0x85, 0x8c, 0x87, 0x80, 0x88, 0x83, 0x8f, 0x8e, 0x8b,
    0x66, 0x6d, 0x6a, 0x62, 0x64, 0x69, 0x61, 0x65, 0x6c, 0x67, 0x60, 0x68, 0x63, 0x6f, 0x6e, 0x6b,
    0x96, 0x9d, 0x9a, 0x92, 0x94, 0x99, 0x91, 0x95, 0x9c, 0x97, 0x90, 0x98, 0x93, 0x9f, 0x9e, 0x9b,
    0xe6, 0xe2, 0xe4, 0xec, 0xea, 0xed, 0xe8, 0xe3, 0xe5, 0xe9, 0xeb, 0xe7, 0xe0, 0xee, 0xef, 0xe1,
    0x26, 0x22, 0x24, 0x2c, 0x2a, 0x2d, 0x28, 0x23, 0x25, 0x29, 0x2b, 0x27, 0x20, 0x2e, 0x2f, 0x21,
    0xd6, 0xd2, 0xd4, 0xdc, 0xda, 0xdd, 0xd8, 0xd3, 0xd5, 0xd9, 0xdb, 0xd7, 0xd0, 0xde, 0xdf, 0xd1,
    0x46, 0x42, 0x44, 0x4c, 0x4a, 0x4d, 0x48, 0x43, 0x45, 0x49, 0x4b, 0x47, 0x40, 0x4e, 0x4f, 0x41,
    0xb6, 0xb2, 0xb4, 0xbc, 0xba, 0xbd, 0xb8, 0xb3, 0xb5, 0xb9, 0xbb, 0xb7, 0xb0, 0xbe, 0xbf, 0xb1,
    0x56, 0x52, 0x54, 0x5c, 0x5a, 0x5d, 0x58, 0x53, 0x55, 0x59, 0x5b, 0x57, 0x50, 0x5e, 0x5f, 0x51,
    0x76, 0x72, 0x74, 0x7c, 0x7a, 0x7d, 0x78, 0x73, 0x75, 0x79, 0x7b, 0x77, 0x70, 0x7e, 0x7f, 0x71,
    0xc6, 0xc2, 0xc4, 0xcc, 0xca, 0xcd, 0xc8, 0xc3, 0xc5, 0xc9, 0xcb, 0xc7, 0xc0, 0xce, 0xcf, 0xc1,
    0xa6, 0xa2, 0xa4, 0xac, 0xaa, 0xad, 0xa8, 0xa3, 0xa5, 0xa9, 0xab, 0xa7, 0xa0, 0xae, 0xaf, 0xa1,
    0x96, 0x92, 0x94, 0x9c, 0x9a, 0x9d, 0x98, 0x93, 0x95, 0x99, 0x9b, 0x97, 0x90, 0x9e, 0x9f, 0x91,
    0x86, 0x82, 0x84, 0x8c, 0x8a, 0x8d, 0x88, 0x83, 0x85, 0x89, 0x8b, 0x87, 0x80, 0x8e, 0x8f, 0x81,
    0x06, 0x02, 0x04, 0x0c, 0x0a, 0x0d, 0x08, 0x03, 0x05, 0x09, 0x0b, 0x07, 0x00, 0x0e, 0x0f, 0x01,
    0xf6, 0xf2, 0xf4, 0xfc, 0xfa, 0xfd, 0xf8, 0xf3, 0xf5, 0xf9, 0xfb, 0xf7, 0xf0, 0xfe, 0xff, 0xf1,
    0x66, 0x62, 0x64, 0x6c, 0x6a, 0x6d, 0x68, 0x63, 0x65, 0x69, 0x6b, 0x67, 0x60, 0x6e, 0x6f, 0x61,
    0x16, 0x12, 0x14, 0x1c, 0x1a, 0x1d, 0x18, 0x13, 0x15, 0x19, 0x1b, 0x17, 0x10, 0x1e, 0x1f, 0x11,
    0x36, 0x32, 0x34, 0x3c, 0x3a, 0x3d, 0x38, 0x33, 0x35, 0x39, 0x3b, 0x37, 0x30, 0x3e, 0x3f, 0x31,
    0x72, 0x7c, 0x73, 0x7b, 0x79, 0x7d, 0x7f, 0x77, 0x71, 0x7e, 0x78, 0x76, 0x70, 0x74, 0x75, 0x7a,
    0xe2, 0xec, 0xe3, 0xeb, 0xe9, 0xed, 0xef, 0xe7, 0xe1, 0xee, 0xe8, 0xe6, 0xe0, 0xe4, 0xe5, 0xea,
    0x82, 0x8c, 0x83, 0x8b, 0x89, 0x8d, 0x8f, 0x87, 0x81, 0x8e, 0x88, 0x86, 0x80, 0x84, 0x85, 0x8a,
    0xc2, 0xcc, 0xc3, 0xcb, 0xc9, 0xcd, 0xcf, 0xc7, 0xc1, 0xce, 0xc8, 0xc6, 0xc0, 0xc4, 0xc5, 0xca,
    0x32, 0x3c, 0x33, 0x3b, 0x39, 0x3d, 0x3f, 0x37, 0x31, 0x3e, 0x38, 0x36, 0x30, 0x34, 0x35, 0x3a,
    0xb2, 0xbc, 0xb3, 0xbb, 0xb9, 0xbd, 0xbf, 0xb7, 0xb1, 0xbe, 0xb8, 0xb6, 0xb0, 0xb4, 0xb5, 0xba,
    0x12, 0x1c, 0x13, 0x1b, 0x19, 0x1d, 0x1f, 0x17, 0x11, 0x1e, 0x18, 0x16, 0x10, 0x14, 0x15, 0x1a,
    0x02, 0x0c, 0x03, 0x0b, 0x09, 0x0d, 0x0f, 0x07, 0x01, 0x0e, 0x08, 0x06, 0x00, 0x04, 0x05, 0x0a,
    0x42, 0x4c, 0x43, 0x4b, 0x49, 0x4d, 0x4f, 0x47, 0x41, 0x4e, 0x48, 0x46, 0x40, 0x44, 0x45, 0x4a,
    0x22, 0x2c, 0x23, 0x2b, 0x29, 0x2d, 0x2f, 0x27, 0x21, 0x2e, 0x28, 0x26, 0x20, 0x24, 0x25, 0x2a,
    0x52, 0x5c, 0x53, 0x5b, 0x59, 0x5d, 0x5f, 0x57, 0x51, 0x5e, 0x58, 0x56, 0x50, 0x54, 0x55, 0x5a,
    0xa2, 0xac, 0xa3, 0xab, 0xa9, 0xad, 0xaf, 0xa7, 0xa1, 0xae, 0xa8, 0xa6, 0xa0, 0xa4, 0xa5, 0xaa,
    0x62, 0x6c, 0x63, 0x6b, 0x69, 0x6d, 0x6f, 0x67, 0x61, 0x6e, 0x68, 0x66, 0x60, 0x64, 0x65, 0x6a,
    0x92, 0x9c, 0x93, 0x9b, 0x99, 0x9d, 0x9f, 0x97, 0x91, 0x9e, 0x98, 0x96, 0x90, 0x94, 0x95, 0x9a,
    0xf2, 0xfc, 0xf3, 0xfb, 0xf9, 0xfd, 0xff, 0xf7, 0xf1, 0xfe, 0xf8, 0xf6, 0xf0, 0xf4, 0xf5, 0xfa,
    0xd2, 0xdc, 0xd3, 0xdb, 0xd9, 0xdd, 0xdf, 0xd7, 0xd1, 0xde, 0xd8, 0xd6, 0xd0, 0xd4, 0xd5, 0xda
};

static UCHAR defTable[] = {
		0xFB, 0xD6, 0xE6, 0x72, 0xCC, 0xED, 0x22, 0xEC,
		0x61, 0xAA, 0xD4, 0x83, 0xAA, 0xB2, 0x4C, 0xCB,
		0x77, 0xF4, 0xBA, 0x39, 0xDE, 0x59, 0x5D, 0xBD,
		0x2,  0x31, 0x78, 0x1F, 0x8D, 0xC5, 0xC3, 0x7,
		0x53, 0x1C, 0xA5, 0x41, 0x3F, 0x27, 0x99, 0x2E,
		0xB0, 0x0,  0x8B, 0x58, 0x25, 0x78, 0x7,  0xA6,
		0x48, 0x43, 0xF0, 0x60, 0xE4, 0x8F, 0x6E, 0x94,
		0x19, 0x6E, 0x1F, 0xF5, 0x96, 0x9B, 0x31, 0xDA
};


// *********** GOST Encryption Code ***********

#define MAKEDWORD(a, b) ((((WORD)(a)) | ((DWORD)((WORD)(b))) << 16))

VOID
GOST_ECB_Encrypt( PDWORD N1,
                  PDWORD N2,
		          PDWORD KeyAddress )
{ USHORT i;
  DWORD  n1;
  BYTE byte0, byte1, byte2, byte3;
/*
  printk("\niN1: %08X", *N1);
  printk("\niN2: %08X", *N2);
  printk("\nKey: %08X %08X %08X %08X", 
          KeyAddress[0],
          KeyAddress[1],
          KeyAddress[2],
          KeyAddress[3] );
*/
  for( i = 0; i < 32; i++)
   {  n1 = (*N1) + KeyAddress[i];

      // now we will pass permutation table (4 8-bit tables)
      byte0 = Table[ LOBYTE(LOWORD(n1)) ];
      byte1 = Table[ HIBYTE(LOWORD(n1)) + 0x100 ];
      byte2 = Table[ LOBYTE(HIWORD(n1)) + 0x200 ];
      byte3 = Table[ HIBYTE(HIWORD(n1)) + 0x300 ];

      n1 = MAKEDWORD( MAKEWORD(byte0,byte1), MAKEWORD(byte2,byte3) );

      // permutation table passed, now left shift on 11 bites
      n1 = (n1 << 11) | (n1 >> (32-11));

      n1  = n1 ^ (*N2);
	  *N2 = *N1;
	  *N1 = n1;
   }
  *N1 = *N2;
  *N2 = n1;
/*
  printk("\noN1: %08X", *N1);
  printk("\noN2: %08X", *N2);
*/
}

// ************ GOST CBC encryption **************

VOID
Encrypt( DWORD *IVector, 
         DWORD *KeyAddress,
         DWORD *SrcBuffer,
         DWORD *DstBuffer,
         DWORD Length )    // in bytes
{ DWORD i;
  DWORD N1,N2;

  N1 = IVector[0];
  N2 = IVector[1];

  for(i = 0; i < (Length >> 2); i = i+2)
    { GOST_ECB_Encrypt( &N1, &N2, KeyAddress );

	  // XOR plaintext with initial vector, 
	  // move rezult to ciphertext and to initial vector
      DstBuffer[i]   = SrcBuffer[i] ^ N1;
      N1             = DstBuffer[i];

      DstBuffer[i+1] = SrcBuffer[i+1] ^ N2;
      N2             = DstBuffer[i+1];
    }
}


// ************ GOST CBC decryption **************

VOID
Decrypt( DWORD *IVector, 
         DWORD *KeyAddress,
         DWORD *SrcBuffer,
         DWORD *DstBuffer,
         DWORD Length )    // in bytes
{ DWORD i;
  DWORD N1, N2, dwTmp;

  N1 = IVector[0];
  N2 = IVector[1];

  for(i = 0; i < (Length >> 2); i = i+2)
    { GOST_ECB_Encrypt( &N1, &N2, KeyAddress );

      // XOR  encrypted text with encrypted initial vector (we get rezult - decrypted text), 
      // move encrypted text to new initial vector.
      // We need dwTmp because SrcBuffer may be the same as DstBuffer

      dwTmp        = SrcBuffer[i] ^ N1;
      N1           = SrcBuffer[i];
      DstBuffer[i] = dwTmp;

      dwTmp          = SrcBuffer[i+1] ^ N2;
      N2             = SrcBuffer[i+1];
      DstBuffer[i+1] = dwTmp;
    }
}


// ************ GOST Key extension **************

BOOL
KeyExtend( PUCHAR KeySource,          // 8  32-bit dwords
           PDWORD KeyDestination )    // 32 32-bit dwords
{ USHORT i;
  DWORD  *hardKey = (DWORD *)defTable;
  PDWORD keySource = (PDWORD)KeySource;

  if ((!keySource) || (!KeyDestination)) return FALSE;

  // Load hardKey to KeyDestination for GOST ECB Decrypt operation
  for( i=0; i<8; i++)  KeyDestination[i] = hardKey[i];
  for( i=8; i<32; i++) KeyDestination[i] = hardKey[7 - (i % 8)];

  // Perform ECB Decryption 
  for( i=0; i<8; i=i+2) GOST_ECB_Encrypt( &(keySource[i]), 
                                          &(keySource[i+1]), 
										  KeyDestination );
  // Copy Decrypted key to KeyDestination
  for( i=0; i<24; i++)  KeyDestination[i] = keySource[i % 8];
  for( i=24; i<32; i++) KeyDestination[i] = keySource[7 - (i-24)];

  return TRUE;
}

char gost_c[]="$Id: gost.c,v 1.3 2002/10/29 07:11:46 crypt Rel-1.6-5 $";