给你来个现成的。
- typedef unsigned char byte;
- void Des_Bit2Byte(byte *, byte *);
- void Des_Byte2Bit(byte *, byte *);
- void Des_DesEncry(byte *, byte *);
- void Des_DesDecry(byte *, byte *);
- void Des_TransPose(byte *, byte *, int);
- void Des_Process(int, byte *, byte *, byte *, byte);
- void Des_Lshift(byte *, byte);
- void Des_Rshift(byte *, byte);
- unsigned char Des_Table0[] = {
- 58,50,42,34,26,18,10, 2,60,52,44,36,28,20,12, 4,
- 62,54,46,38,30,22,14, 6,64,56,48,40,32,24,16, 8,
- 57,49,41,33,25,17, 9, 1,59,51,43,35,27,19,11, 3,
- 61,53,45,37,29,21,13, 5,63,55,47,39,31,23,15, 7};
- unsigned char Des_Table1[] = {
- 57,49,41,33,25,17, 9, 1,58,50,42,34,26,18,10, 2,
- 59,51,43,35,27,19,11, 3,60,52,44,36,63,55,47,39,
- 31,23,15, 7,62,54,46,38,30,22,14, 6,61,53,45,37,
- 29,21,13, 5,28,20,12, 4};
- unsigned char Des_Table2[] = {
- 14,17,11,24, 1, 5, 3,28,15, 6,21,10,23,19,12, 4,
- 26, 8,16, 7,27,20,13, 2,41,52,31,37,47,55,30,40,
- 51,45,33,48,44,49,39,56,34,53,46,42,50,36,29,32};
- unsigned char Des_Table3[] = {
- 40, 8,48,16,56,24,64,32,39, 7,47,15,55,23,63,31,
- 38, 6,46,14,54,22,62,30,37, 5,45,13,53,21,61,29,
- 36, 4,44,12,52,20,60,28,35, 3,43,11,51,19,59,27,
- 34, 2,42,10,50,18,58,26,33, 1,41, 9,49,17,57,25};
- unsigned char Des_Table4[] = {
- 32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, 8, 9,10,11,
- 12,13,12,13,14,15,16,17,16,17,18,19,20,21,20,21,
- 22,23,24,25,24,25,26,27,28,29,28,29,30,31,32, 1};
- unsigned char Des_Table5[] = {
- 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1};
- unsigned char Des_Table6[] = {
- 0, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1};
- unsigned char Des_Table7[] = {
- 16, 7,20,21,29,12,28,17, 1,15,23,26, 5,18,31,10,
- 2, 8,24,14,32,27, 3, 9,19,13,30, 6,22,11, 4,25};
- unsigned char Des_Table8[][64] = {
- {14, 4,13, 1, 2,15,11, 8, 3,10, 6,12, 5, 9, 0, 7,
- 0,15, 7, 4,14, 2,13, 1,10, 6,12,11, 9, 5, 3, 8,
- 4, 1,14, 8,13, 6, 2,11,15,12, 9, 7, 3,10, 5, 0,
- 15,12, 8, 2, 4, 9, 1, 7, 5,11, 3,14,10, 0, 6,13},
- {15, 1, 8,14, 6,11, 3, 4, 9, 7, 2,13,12, 0, 5,10,
- 3,13, 4, 7,15, 2, 8,14,12, 0, 1,10, 6, 9,11, 5,
- 0,14, 7,11,10, 4,13, 1, 5, 8,12, 6, 9, 3, 2,15,
- 13, 8,10, 1, 3,15, 4, 2,11, 6, 7,12, 0, 5,14, 9},
- {10, 0, 9,14, 6, 3,15, 5, 1,13,12, 7,11, 4, 2, 8,
- 13, 7, 0, 9, 3, 4, 6,10, 2, 8, 5,14,12,11,15, 1,
- 13, 6, 4, 9, 8,15, 3, 0,11, 1, 2,12, 5,10,14, 7,
- 1,10,13, 0, 6, 9, 8, 7, 4,15,14, 3,11, 5, 2,12},
- {7,13,14, 3, 0, 6, 9,10, 1, 2, 8, 5,11,12, 4,15,
- 13, 8,11, 5, 6,15, 0, 3, 4, 7, 2,12, 1,10,14, 9,
- 10, 6, 9, 0,12,11, 7,13,15, 1, 3,14, 5, 2, 8, 4,
- 3,15, 0, 6,10, 1,13, 8, 9, 4, 5,11,12, 7, 2,14},
- {2,12, 4, 1, 7,10,11, 6, 8, 5, 3,15,13, 0,14, 9,
- 14,11, 2,12, 4, 7,13, 1, 5, 0,15,10, 3, 9, 8, 6,
- 4, 2, 1,11,10,13, 7, 8,15, 9,12, 5, 6, 3, 0,14,
- 11, 8,12, 7, 1,14, 2,13, 6,15, 0, 9,10, 4, 5, 3},
- {12, 1,10,15, 9, 2, 6, 8, 0,13, 3, 4,14, 7, 5,11,
- 10,15, 4, 2, 7,12, 9, 5, 6, 1,13,14, 0,11, 3, 8,
- 9,14,15, 5, 2, 8,12, 3, 7, 0, 4,10, 1,13,11, 6,
- 4, 3, 2,12, 9, 5,15,10,11,14, 1, 7, 6, 0, 8,13},
- {4,11, 2,14,15, 0, 8,13, 3,12, 9, 7, 5,10, 6, 1,
- 13, 0,11, 7, 4, 9, 1,10,14, 3, 5,12, 2,15, 8, 6,
- 1, 4,11,13,12, 3, 7,14,10,15, 6, 8, 0, 5, 9, 2,
- 6,11,13, 8, 1, 4,10, 7, 9, 5, 0,15,14, 2, 3,12},
- {13, 2, 8, 4, 6,15,11, 1,10, 9, 3,14, 5, 0,12, 7,
- 1,15,13, 8,10, 3, 7, 4,12, 5, 6,11, 0,14, 9, 2,
- 7,11, 4, 1, 9,12,14, 2, 0, 6,10,13,15, 3, 5, 8,
- 2, 1,14, 7, 4,10, 8,13,15,12, 9, 0, 3, 5, 6,11}};
- /*
- 函数功能:根据指定的密钥进行加密,将密文填回原始的字符
- 传入参数:
- data : 原始的字符
- key : 密钥
- 返回参数:
- */
- void DES_Encode(unsigned char * data, unsigned char * key)
- {
- byte data_text[64], key_text[64];
- Des_Bit2Byte(data, data_text);
- Des_Bit2Byte(key, key_text);
- Des_DesDecry(data_text, key_text);
- Des_Byte2Bit(data_text, data);
- return;
- }
- void DES_Encode(unsigned char * pdata,int length, unsigned char * key)
- {
- int id;
- for(id=0;id<length/8;id++)
- DES_Encode(pdata+id*8,key);
- return;
- }
- /*
- 函数功能:根据指定的密钥解密密文,将原始的字符填传回到密文对应的地址
- 传入参数:
- data : 密文
- key : 密钥
- 返回参数:
- */
- void DES_Decode(unsigned char * data, unsigned char * key)
- {
- byte data_text[64], key_text[64];
- Des_Bit2Byte(data, data_text);
- Des_Bit2Byte(key, key_text);
- Des_DesEncry(data_text, key_text);
- Des_Byte2Bit(data_text, data);
- return;
- }
- void DES_Decode(unsigned char * pdata, int length,unsigned char * key)
- {
- int id;
- for(id=0;id<length/8;id++)
- DES_Decode(pdata+8*id,key);
- return;
- }
- void Des_Bit2Byte(byte *text1, byte *text2)
- {
- int i_temp1, i_temp2;
- byte mask, c_temp1;
- for (i_temp1 = 0; i_temp1 < 8; i_temp1++)
- {
- c_temp1 = text1[i_temp1];
- mask = 0x80;
- for (i_temp2 = 0; i_temp2 < 8; i_temp2++)
- {
- if (c_temp1 & mask)
- text2[i_temp1 * 8 + i_temp2] = 1;
- else
- text2[i_temp1 * 8 + i_temp2] = 0;
- mask >>= 1;
- }
- };
- return;
- }
- void Des_Byte2Bit(byte *text1, byte *text2)
- {
- int i_temp1, i_temp2;
- byte mask;
- memset(text2, 0, 8);
- for (i_temp1 = 0; i_temp1 < 8; i_temp1++)
- {
- mask = 0x80;
- for (i_temp2 = 0; i_temp2 < 8; i_temp2++)
- {
- if (text1[i_temp1 * 8 + i_temp2])
- text2[i_temp1] |= mask;
- mask >>= 1;
- }
- }
- return;
- }
- void Des_DesEncry(byte *text1, byte *key)
- {
- byte c_temp1[64], c_temp2[32];
- int i_temp1, i_temp2;
- Des_TransPose(text1, Des_Table0, 64);
- Des_TransPose(key, Des_Table1, 56);
- for (i_temp1 = 0; i_temp1 < 16; i_temp1++)
- {
- memcpy(c_temp1, text1+32, 32);
- Des_Process(i_temp1, key, c_temp1, c_temp2, 'L');
- for (i_temp2 = 0; i_temp2 < 32; i_temp2++)
- if (text1[i_temp2] == c_temp2[i_temp2])
- c_temp1[i_temp2 + 32] = 0;
- else
- c_temp1[i_temp2 + 32] = 1;
- memcpy(text1, c_temp1, 64);
- }
- memcpy(text1, c_temp1+32, 32);
- memcpy(text1+32, c_temp1, 32);
- Des_TransPose(text1, Des_Table3, 64);
- return;
- }
- void Des_DesDecry(byte *text1, byte *key)
- {
- byte c_temp1[64], c_temp2[32];
- int i_temp1, i_temp2;
- Des_TransPose(text1, Des_Table0, 64);
- memcpy(c_temp2, text1+32, 32);
- memcpy(text1+32, text1, 32);
- memcpy(text1, c_temp2, 32);
- Des_TransPose(key, Des_Table1, 56);
- for (i_temp1 = 0; i_temp1 < 16; i_temp1++)
- {
- memcpy(c_temp1 + 32, text1, 32);
- Des_Process(i_temp1, key, c_temp1 + 32, c_temp2, 'R');
- for (i_temp2 = 0; i_temp2 < 32; i_temp2++)
- if (text1[i_temp2 + 32] == c_temp2[i_temp2])
- c_temp1[i_temp2] = 0;
- else
- c_temp1[i_temp2] = 1;
- memcpy(text1, c_temp1, 64);
- }
- Des_TransPose(text1, Des_Table3, 64);
- return;
- }
- void Des_TransPose(byte *text, byte *table, int index)
- {
- byte c_temp1[64];
- int i_temp1;
- memcpy(c_temp1, text, 64);
- for (i_temp1 = 0; i_temp1 < index; i_temp1++)
- text[i_temp1] = c_temp1[table[i_temp1] - 1];
- return;
- }
- void Des_Process(int i, byte *key, byte *R32, byte *PB, byte flag)
- {
- byte extr32[48], extkey[56], c_temp1;
- int i_temp1;
- memcpy(extr32, R32, 32);
- Des_TransPose(extr32, Des_Table4, 48);
- if (toupper(flag) == 'L')
- Des_Lshift(key, Des_Table5[i]);
- else
- Des_Rshift(key, Des_Table6[i]);
- memcpy(extkey, key, 56);
- Des_TransPose(extkey, Des_Table2, 48);
- for (i_temp1 = 0; i_temp1 < 48; i_temp1++)
- if (extr32[i_temp1] == extkey[i_temp1])
- extr32[i_temp1] = 0;
- else
- extr32[i_temp1] = 1;
- for (i_temp1 = 0; i_temp1 < 8; i_temp1++)
- {
- c_temp1 = (byte)(extr32[i_temp1 * 6] * 32 +
- extr32[i_temp1 * 6 + 5] * 16 +
- extr32[i_temp1 * 6 + 1] * 8 +
- extr32[i_temp1 * 6 + 2] * 4 +
- extr32[i_temp1 * 6 + 3] * 2 +
- extr32[i_temp1 * 6 + 4]);
- c_temp1 = Des_Table8[i_temp1][c_temp1];
- if (c_temp1 >= 8)
- {
- PB[i_temp1 * 4] = 1;
- c_temp1 = (byte)(c_temp1 - 8);
- }
- else
- PB[i_temp1 * 4] = 0;
- if (c_temp1 >= 4)
- {
- PB[i_temp1 * 4 + 1] = 1;
- c_temp1 = (byte)(c_temp1 - 4);
- }
- else
- PB[i_temp1 * 4 + 1] = 0;
- if (c_temp1 >= 2)
- {
- PB[i_temp1 * 4 + 2] = 1;
- c_temp1 = (byte)(c_temp1 - 2);
- }
- else
- PB[i_temp1 * 4 + 2] = 0;
- if (c_temp1 >= 1)
- PB[i_temp1 * 4 + 3] = 1;
- else
- PB[i_temp1 * 4 + 3] = 0;
- }
- Des_TransPose(PB, Des_Table7, 32);
- return;
- }
- void Des_Lshift(byte *key, byte cnt)
- {
- byte c_temp1, c_temp2;
- int i_temp1,i_temp2;
- for (i_temp2 = 0; i_temp2 < cnt; i_temp2++)
- {
- c_temp1 = key[0];
- c_temp2 = key[28];
- for (i_temp1 = 0; i_temp1 < 55; i_temp1++)
- key[i_temp1] = key[i_temp1 + 1];
- key[27] = c_temp1;
- key[55] = c_temp2;
- }
- return;
- }
- void Des_Rshift(byte *key, byte cnt)
- {
- byte c_temp1, c_temp2;
- int i_temp1,i_temp2;
- for (i_temp2 = 0; i_temp2 < cnt; i_temp2++)
- {
- c_temp1 = key[27];
- c_temp2 = key[55];
- for (i_temp1 = 55; i_temp1 >0; i_temp1--)
- key[i_temp1] = key[i_temp1 - 1];
- key[0] = c_temp1;
- key[28] = c_temp2;
- }
- return;
- }
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