现在有两个文件，怎么样利用现有的Des算法给的三个接口去实现，用一个文件中的内容作密钥去加密另外一个文件，然后把加密后的文件写入第三个新文件。
假设a文件为待加密文件
b文件为密钥文件
接口为： void __fastcall SetKey(unsigned char *pInkey); // 初始化密匙
void __fastcall Encrypt(unsigned char *pInData, unsigned char *pOut); // 数据加密
void __fastcall Decrypt(unsigned char *pInData, unsigned char *pOut); // 数据解密
假设a文件为待加密文件
b文件为密钥文件
接口为： void __fastcall SetKey(unsigned char *pInkey); // 初始化密匙
void __fastcall Encrypt(unsigned char *pInData, unsigned char *pOut); // 数据加密
void __fastcall Decrypt(unsigned char *pInData, unsigned char *pOut); // 数据解密
/* d3des.h -
*
* Headers and defines for d3des.c
* Graven Imagery, 1992.
*
* Copyright (c) 1988,1989,1990,1991,1992 by Richard Outerbridge
* (GEnie : OUTER; CIS : [71755,204])
*/#define D2_DES /* include double-length support */
#define D3_DES /* include triple-length support */#ifdef D3_DES
#ifndef D2_DES
#define D2_DES /* D2_DES is needed for D3_DES */
#endif
#endif#define EN0 0 /* MODE == encrypt */
#define DE1 1 /* MODE == decrypt *//* A useful alias on 68000-ish machines, but NOT USED HERE. */typedef union {
unsigned long blok[2];
unsigned short word[4];
unsigned char byte[8];
} M68K;extern void deskey(unsigned char *, short);
/* hexkey[8] MODE
* Sets the internal key register according to the hexadecimal
* key contained in the 8 bytes of hexkey, according to the DES,
* for encryption or decryption according to MODE.
*/extern void usekey(unsigned long *);
/* cookedkey[32]
* Loads the internal key register with the data in cookedkey.
*/extern void cpkey(unsigned long *);
/* cookedkey[32]
* Copies the contents of the internal key register into the storage
* located at &cookedkey[0].
*/extern void des(unsigned char *, unsigned char *);
/* from[8] to[8]
* Encrypts/Decrypts (according to the key currently loaded in the
* internal key register) one block of eight bytes at address 'from'
* into the block at address 'to'. They can be the same.
*/#ifdef D2_DES#define desDkey(a,b) des2key((a),(b))
extern void des2key(unsigned char *, short);
/* hexkey[16] MODE
* Sets the internal key registerS according to the hexadecimal
* keyS contained in the 16 bytes of hexkey, according to the DES,
* for DOUBLE encryption or decryption according to MODE.
* NOTE: this clobbers all three key registers!
*/extern void Ddes(unsigned char *, unsigned char *);
/* from[8] to[8]
* Encrypts/Decrypts (according to the keyS currently loaded in the
* internal key registerS) one block of eight bytes at address 'from'
* into the block at address 'to'. They can be the same.
*/extern void D2des(unsigned char *, unsigned char *);
/* from[16] to[16]
* Encrypts/Decrypts (according to the keyS currently loaded in the
* internal key registerS) one block of SIXTEEN bytes at address 'from'
* into the block at address 'to'. They can be the same.
*/extern void makekey(char *, unsigned char *);
/* *password, single-length key[8]
* With a double-length default key, this routine hashes a NULL-terminated
* string into an eight-byte random-looking key, suitable for use with the
* deskey() routine.
*/#define makeDkey(a,b) make2key((a),(b))
extern void make2key(char *, unsigned char *);
/* *password, double-length key[16]
* With a double-length default key, this routine hashes a NULL-terminated
* string into a sixteen-byte random-looking key, suitable for use with the
* des2key() routine.
*/#ifndef D3_DES /* D2_DES only */#define useDkey(a) use2key((a))
#define cpDkey(a) cp2key((a))extern void use2key(unsigned long *);
/* cookedkey[64]
* Loads the internal key registerS with the data in cookedkey.
* NOTE: this clobbers all three key registers!
*/extern void cp2key(unsigned long *);
/* cookedkey[64]
* Copies the contents of the internal key registerS into the storage
* located at &cookedkey[0].
*/#else /* D3_DES too */#define useDkey(a) use3key((a))
#define cpDkey(a) cp3key((a))extern void des3key(unsigned char *, short);
/* hexkey[24] MODE
* Sets the internal key registerS according to the hexadecimal
* keyS contained in the 24 bytes of hexkey, according to the DES,
* for DOUBLE encryption or decryption according to MODE.
*/extern void use3key(unsigned long *);
/* cookedkey[96]
* Loads the 3 internal key registerS with the data in cookedkey.
*/extern void cp3key(unsigned long *);
/* cookedkey[96]
* Copies the contents of the 3 internal key registerS into the storage
* located at &cookedkey[0].
*/extern void make3key(char *, unsigned char *);
/* *password, triple-length key[24]
* With a triple-length default key, this routine hashes a NULL-terminated
* string into a twenty-four-byte random-looking key, suitable for use with
* the des3key() routine.
*/#endif /* D3_DES */
#endif /* D2_DES *//* d3des.h V5.09 rwo 9208.04 15:06 Graven Imagery
********************************************************************/
{
private:
unsigned char AskL(void);
void ShiftR(void);
void initialize(unsigned char *key);int OLDE;
int OLDL;
unsigned char A[24];
unsigned char B[8];
unsigned char D[8];
unsigned char Bits[8][3];
unsigned char ROM[256];
#define loopshiftr(b,d) ((b>>d)|(b<<(8-d)))public:
Encrypt();
int EN_DE_Code(unsigned char *buf,int size,unsigned char *key); };
{}void Encrypt::initialize(unsigned char * key)
{
int i,j;OLDE = 1;
OLDL = 1;A[0]=0x12, A[1]=0x34, A[2]=0x56, A[3]=0x78, A[4]=0x90;
A[5]=0x12, A[6]=0x34, A[7]=0x56, A[8]=0x78, A[9]=0x90;
A[10]=0x12, A[11]=0x34, A[12]=0x56, A[13]=0x78, A[14]=0x90;
A[15]=0x12, A[16]=0x34, A[17]=0x56, A[18]=0x78, A[19]=0x90;
A[20]=0x12, A[21]=0x34, A[22]=0x56, A[23]=0x78;B[0]=0x12,B[1]=0x34,B[2]=0x56,B[3]=0x78;
B[4]=0x90,B[5]=0x12,B[6]=0x34,B[7]=0x56; Bits[0][0]=1,Bits[0][1]=6,Bits[0][2]=7;
Bits[1][0]=2,Bits[1][1]=4,Bits[1][2]=6;
Bits[2][0]=3,Bits[2][1]=2,Bits[2][2]=8;
Bits[3][0]=4,Bits[3][1]=5,Bits[3][2]=1;
Bits[4][0]=5,Bits[4][1]=7,Bits[4][2]=3;
Bits[5][0]=6,Bits[5][1]=3,Bits[5][2]=5;
Bits[6][0]=7,Bits[6][1]=8,Bits[6][2]=4;
Bits[7][0]=8,Bits[7][1]=1,Bits[7][2]=2;
for(j=0,i=0;i<10;i++,j++)
A[j*2]=key[i];
for(j=1;i<16;i++,j++)
B[j]=key[i];
unsigned char InitROM[256] = {
0x99, 0xC7, 0x31, 0xB4, 0x89, 0xDC, 0x7C, 0x9C, 0x90, 0x80, 0xE7, 0xE5, 0xF9, 0x13, 0x73, 0x75,
0x47, 0x9A, 0x65, 0x93, 0x2A, 0xA2, 0xB9, 0x1F, 0xA8, 0x51, 0x14, 0x98, 0x88, 0xD7, 0x70, 0x4D,
0x6A, 0x17, 0x96, 0x84, 0x59, 0x7B, 0xB2, 0x32, 0x94, 0x34, 0x5D, 0x0A, 0xFA, 0x8D, 0x30, 0x8A,
0xD1, 0x78, 0xBA, 0xCB, 0x21, 0x07, 0x38, 0x6B, 0xAF, 0xAE, 0xDE, 0x05, 0x82, 0xB1, 0x8C, 0xD0,
0x86, 0xD2, 0xAC, 0x56, 0x2C, 0x1C, 0xE4, 0x9E, 0x33, 0x48, 0x18, 0x68, 0x6C, 0x11, 0xE3, 0xC0,
0xE9, 0x7E, 0x2E, 0xC5, 0x3F, 0x61, 0xFC, 0xEF, 0x28, 0xB6, 0x8F, 0x81, 0x3D, 0x5A, 0x4A, 0xA1,
0x09, 0xB0, 0x6D, 0xEC, 0xC4, 0x76, 0x15, 0x36, 0xEA, 0xBC, 0xD8, 0x69, 0x92, 0x97, 0x27, 0xB7,
0x04, 0x3E, 0x1D, 0xC3, 0x0B, 0x4C, 0x1A, 0x19, 0x50, 0x4F, 0xC2, 0xCA, 0x8E, 0x83, 0xA5, 0x25,
0x79, 0xE1, 0xA3, 0x2B, 0xE2, 0x22, 0x5B, 0x0E, 0xDB, 0x0D, 0xFF, 0xDA, 0xA0, 0x62, 0xF1, 0xB8,
0x63, 0xD5, 0x45, 0x95, 0x8B, 0xC9, 0x49, 0x4B, 0x74, 0x10, 0x64, 0x3C, 0xF3, 0x1B, 0xEE, 0x42,
0xDD, 0xAA, 0x00, 0x40, 0xCE, 0xE0, 0x5C, 0x54, 0x29, 0x60, 0x9D, 0x5F, 0xAB, 0xBB, 0x4E, 0xBF,
0x7F, 0x41, 0xDF, 0xC6, 0x44, 0xD3, 0x0C, 0xF2, 0xD9, 0x66, 0xF6, 0x43, 0xFD, 0x39, 0x77, 0xF8,
0x9F, 0x67, 0x1E, 0xCD, 0xC8, 0x58, 0xED, 0xFE, 0x03, 0x91, 0x01, 0xD6, 0xAD, 0x5E, 0x52, 0xA9,
0xBE, 0x20, 0xB5, 0xFB, 0x0F, 0x16, 0x85, 0x23, 0x2F, 0xF5, 0x3A, 0x7D, 0xCC, 0x24, 0xA7, 0x9B,
0xF7, 0x46, 0x53, 0xB3, 0xA4, 0x02, 0x08, 0xA6, 0x87, 0xD4, 0x26, 0x57, 0xC1, 0xF0, 0x12, 0x6E,
0x06, 0xE8, 0xEB, 0xCF, 0x6F, 0x71, 0x3B, 0xBD, 0x2D, 0x7A, 0xF4, 0x55, 0x72, 0x37, 0x35, 0xE6
};
for(i=0;i<256;i++)
ROM[i]=InitROM[i];}void Encrypt::ShiftR()
{
unsigned char c1, b5;
int i, j1, j2, j3;
c1 = A[23] + A[17] + A[9] + A[6];
for(i = 23; i > 0; i--) A[i] = A[i-1];
A[0] = c1;
b5 = (B[0] + B[1]) ^ (B[6] + B[7]);
for(i = 7; i > 0; i--) B[i] = B[i-1];
B[0] = b5 + c1;
for(i = 0; i < 8; i++)
{
j1 = 8 - Bits[i][0];
j2 = 8 - Bits[i][1];
j3 = 8 - Bits[i][2];
D[i] = (((A[i] >> j1) & 1) << 2) + (((A[i+8] >> j2) & 1) << 1) + ((A[i+8] >> j3) & 1);
}
B[i] = loopshiftr(B[i], D[i]);}unsigned char Encrypt::AskL()
{
unsigned char C, D, E, R, E1;
C = (B[2] ^ B[3]) + (B[4] ^ B[5]);
D = C * ((B[6] + B[7]) ^ OLDL); if(D == 0) D = 0x80;
E = (B[0] + B[1]) ^ C;
E1 = OLDE + E;
OLDE = E;
R = ROM[D] + E1;
OLDL = R;
ShiftR();
return(R);
}int Encrypt::EN_DE_Code(unsigned char * buf, int size, unsigned char * key)
{
int i;
initialize(key);
for(i=0;i<size;i++)
{
unsigned char c = buf[i];
c ^= AskL();
buf[i]=c;
}
return size;
}