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1、#include stdio.h#include memory.h#include time.h#include stdlib.h#includestring.h#define PLAIN_FILE_OPEN_ERROR-1#define KEY_FILE_OPEN_ERROR-2#define CIPHER_FILE_OPEN_ERROR-3#define OK 1 typedef char ElemType;/初始置换表IP int IP_Table64=58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,14,6
2、,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;/初始置换表/逆初始置换表IP-1 int IP_1_Table64=40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,5
3、0,18,58,26,33,1,41,9,49,17,57,25;/末置换表/扩充置换表E int E_Table48=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;/扩展置换表/置换函数P int P_Table32=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
4、,25 名师资料总结-精品资料欢迎下载-名师精心整理-第 1 页，共 12 页 -;/p 盒置换表/S 盒int S8416=/S1 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,/S2 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
5、,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,/S3 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,/S4 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
6、,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,/S5 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,/S6 12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,10,15,4,2,7,12,
7、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,/S7 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,/S8 13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,1,1
8、5,13,8,10,3,7,4,12,5,6,11,0,14,9,2,7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11;/置换选择1 名师资料总结-精品资料欢迎下载-名师精心整理-第 2 页，共 12 页 -int PC_156=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
9、,37,29,21,13,5,28,20,12,4;/置换选择2 int PC_248=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;/密钥压缩表/对左移位数表int MOVE_TIMES16=1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1;void ByteToBit(ElemType ch,ElemType bit8);/字节转换成二进制void Bi
10、tToByte(ElemType bit8,ElemType*ch);/二进制转换成字节void Char8ToBit64(ElemType ch8,ElemType bit64);/将长度为 8 的字符串转为二进制位串void DES_MakeSubKeys(ElemType key64,ElemType subKeys1648);/生成子密钥void DES_PC1_Transform(ElemType key64,ElemType tempbts56);/密钥置换void DES_PC2_Transform(ElemType key56,ElemType tempbts48);/密钥扩展
11、void DES_ROL(ElemType data56,int time);/密钥移动方法void DES_IP_Transform(ElemType data64);/初始变换void DES_IP_1_Transform(ElemType data64);/末置换void DES_E_Transform(ElemType data48);/数据右部扩展void DES_P_Transform(ElemType data32);/p置换void DES_SBOX(ElemType data48);/s置换void DES_XOR(ElemType R48,ElemType L48,int
12、count);void DES_Swap(ElemType left32,ElemType right32);void DES_EncryptBlock(ElemType plainBlock8,ElemType subKeys1648,ElemType cipherBlock8);void DES_DecryptBlock(ElemType cipherBlock8,ElemType subKeys1648,ElemType plainBlock8);int DES_Encrypt(char*plainFile,char*keyStr,char*cipherFile);/加密方法int DE
13、S_Decrypt(char*cipherFile,char*keyStr,char*plainFile);/解密方法int CFB_Decrypt(ElemType plain100,ElemType key8,ElemType cipher100);int CFB_Encrypt(ElemType plain100,ElemType key8,ElemType cipher100);/字节转换成二进制void ByteToBit(ElemType ch,ElemType bit8)名师资料总结-精品资料欢迎下载-名师精心整理-第 3 页，共 12 页 -int cnt;for(cnt=0;
14、cnt cnt)&1;/二进制转换成字节void BitToByte(ElemType bit8,ElemType*ch)int cnt;for(cnt=0;cnt 8;cnt+)*ch|=*(bit+cnt)cnt;/将长度为8 的字符串转为二进制位串void Char8ToBit64(ElemType ch8,ElemType bit64)int cnt;for(cnt=0;cnt 8;cnt+)ByteToBit(*(ch+cnt),bit+(cnt3);/将二进制位串转为长度为8 的字符串void Bit64ToChar8(ElemType bit64,ElemType ch8)int
15、 cnt;memset(ch,0,8);for(cnt=0;cnt 8;cnt+)BitToByte(bit+(cnt3),ch+cnt);/生成子密钥void DES_MakeSubKeys(ElemType key64,ElemType subKeys1648)ElemType temp56;int cnt;DES_PC1_Transform(key,temp);/PC1 置换for(cnt=0;cnt 16;cnt+)/16轮跌代，产生16 个子密钥DES_ROL(temp,MOVE_TIMEScnt);/循环左移DES_PC2_Transform(temp,subKeyscnt);/P
16、C2置换，产生子密钥 /密钥置换方法void DES_PC1_Transform(ElemType key64,ElemType tempbts56)名师资料总结-精品资料欢迎下载-名师精心整理-第 4 页，共 12 页 -int cnt;for(cnt=0;cnt 56;cnt+)tempbtscnt=keyPC_1cnt-1;/密钥扩展方法void DES_PC2_Transform(ElemType key56,ElemType tempbts48)int cnt;for(cnt=0;cnt 48;cnt+)tempbtscnt=keyPC_2cnt-1;/循环左移void DES_RO
17、L(ElemType data56,int time)ElemType temp56;/保存将要循环移动到右边的位memcpy(temp,data,time);memcpy(temp+time,data+28,time);/前 28 位移动memcpy(data,data+time,28-time);memcpy(data+28-time,temp,time);/后 28 位移动memcpy(data+28,data+28+time,28-time);memcpy(data+56-time,temp+time,time);/IP 置换void DES_IP_Transform(ElemType
18、 data64)int cnt;ElemType temp64;for(cnt=0;cnt 64;cnt+)tempcnt=dataIP_Tablecnt-1;memcpy(data,temp,64);/IP 逆置换void DES_IP_1_Transform(ElemType data64)名师资料总结-精品资料欢迎下载-名师精心整理-第 5 页，共 12 页 -int cnt;ElemType temp64;for(cnt=0;cnt 64;cnt+)tempcnt=dataIP_1_Tablecnt-1;memcpy(data,temp,64);/扩展置换void DES_E_Tran
19、sform(ElemType data48)int cnt;ElemType temp48;for(cnt=0;cnt 48;cnt+)tempcnt=dataE_Tablecnt-1;memcpy(data,temp,48);/P 置换void DES_P_Transform(ElemType data32)int cnt;ElemType temp32;for(cnt=0;cnt 32;cnt+)tempcnt=dataP_Tablecnt-1;memcpy(data,temp,32);/异或void DES_XOR(ElemType R48,ElemType L48,int count)
20、int cnt;for(cnt=0;cnt count;cnt+)Rcnt=Lcnt;/S 盒置换void DES_SBOX(ElemType data48)int cnt;int line,row,output;int cur1,cur2;for(cnt=0;cnt 8;cnt+)cur1=cnt*6;cur2=cnt2;名师资料总结-精品资料欢迎下载-名师精心整理-第 6 页，共 12 页 -/计算在 S盒中的行与列line=(datacur11)+datacur1+5;/每组第一位乘2 加上第六位row=(datacur1+13)+(datacur1+22)+(datacur1+33;d
21、atacur2+1=(output&0X04)2;datacur2+2=(output&0X02)1;datacur2+3=output&0 x01;/交换void DES_Swap(ElemType left32,ElemType right32)ElemType temp32;memcpy(temp,left,32);memcpy(left,right,32);memcpy(right,temp,32);/加密单个分组void DES_EncryptBlock(ElemType plainBlock8,ElemType subKeys1648,ElemType cipherBlock8)E
22、lemType plainBits64;ElemType copyRight48;int cnt;Char8ToBit64(plainBlock,plainBits);/初始置换（IP 置换）DES_IP_Transform(plainBits);/16 轮迭代for(cnt=0;cnt=0;cnt-)memcpy(copyRight,cipherBits+32,32);/将右半部分进行扩展置换，从32 位扩展到48 位DES_E_Transform(copyRight);/将右半部分与子密钥进行异或操作DES_XOR(copyRight,subKeyscnt,48);/异或结果进入S 盒，输
23、出32 位结果DES_SBOX(copyRight);/P 置换DES_P_Transform(copyRight);/将明文左半部分与右半部分进行异或DES_XOR(cipherBits,copyRight,32);if(cnt!=0)/最终完成左右部的交换DES_Swap(cipherBits,cipherBits+32);/逆初始置换（IP1 置换）名师资料总结-精品资料欢迎下载-名师精心整理-第 8 页，共 12 页 -DES_IP_1_Transform(cipherBits);Bit64ToChar8(cipherBits,plainBlock);int DES_Encrypt(E
24、lemType IV64,ElemType key8,ElemType Sfrist8)ElemType IVBlock64,bKey8,subKeys1648,cipherBlock8,cipherBits64;Bit64ToChar8(IV,IVBlock);Char8ToBit64(key,bKey);/生成子密钥DES_MakeSubKeys(bKey,subKeys);DES_EncryptBlock(IVBlock,subKeys,cipherBlock);Char8ToBit64(cipherBlock,cipherBits);for(int i=0;i8;i+)Sfristi=
25、cipherBitsi;return OK;int CFB_Encrypt(ElemType plain100,ElemType key8,ElemType cipher100)ElemType plainbit8;ElemType Sfrist8,Cbit8;ElemType IV64,IVBlock8=0;Char8ToBit64(IVBlock,IV);/DES_Encrypt(IV,key,Sfrist);for(int i=0;istrlen(plain);i+)DES_Encrypt(IV,key,Sfrist);ByteToBit(plaini,plainbit);for(int
26、 j=0;j8;j+)Cbitj=plainbitjSfristj;for(j=0;j56;j+)IVj=IVj+8;for(j=0;j8;j+)IVj+56=Cbitj;BitToByte(Cbit,&cipheri);printf(cipher：n%sn,cipher);名师资料总结-精品资料欢迎下载-名师精心整理-第 9 页，共 12 页 -return 0;int CFB_Decrypt(ElemType CFB_plain100,ElemType key8,ElemType cipher100)ElemType cipherbit8;ElemType Sfrist8,Pbit8;El
27、emType IV64,IVBlock8=0;Char8ToBit64(IVBlock,IV);for(int i=0;istrlen(cipher);i+)DES_Encrypt(IV,key,Sfrist);ByteToBit(cipheri,cipherbit);for(int j=0;j8;j+)Pbitj=cipherbitjSfristj;for(j=0;j56;j+)IVj=IVj+8;for(j=0;j8;j+)IVj+56=cipherbitj;BitToByte(Pbit,&CFB_plaini);printf(%sn,CFB_plain);return 0;int CFB
28、()/*clock_t a,b;a=clock();b=clock();a=clock();b=clock();printf(解密消耗%d 毫秒 n,b-a);/system(pause);/getchar();*/ElemType plain100=0,CFB_plain100=0,plainbit8,key8,cipher100=0;printf(DES in CFB moden);printf(plesse interput plainn);scanf(%s,&plain);名师资料总结-精品资料欢迎下载-名师精心整理-第 10 页，共 12 页 -printf(please inter
29、put key(8)n);scanf(%s,&key);CFB_Encrypt(plain,key,cipher);printf(nDecrypt:n);CFB_Decrypt(CFB_plain,key,cipher);return OK;int OFB_DeEncrypt(ElemType plain100,ElemType key8,ElemType cipher100)ElemType plainbit8;ElemType Sfrist8,Cbit8;ElemType IV64,IVBlock8=0;Char8ToBit64(IVBlock,IV);/DES_Encrypt(IV,ke
30、y,Sfrist);for(int i=0;istrlen(plain);i+)DES_Encrypt(IV,key,Sfrist);ByteToBit(plaini,plainbit);for(int j=0;j8;j+)Cbitj=plainbitjSfristj;for(j=0;j56;j+)IVj=IVj+8;for(j=0;j8;j+)IVj+56=Sfristj;BitToByte(Cbit,&cipheri);return 0;int OFB()ElemType plain100=0,OFB_plain100=0,plainbit8,key8,cipher100=0;printf
31、(DES in OFB moden);printf(plesse interput plainn);scanf(%s,&plain);printf(please interput key(8)n);scanf(%s,&key);名师资料总结-精品资料欢迎下载-名师精心整理-第 11 页，共 12 页 -OFB_DeEncrypt(plain,key,cipher);printf(cipher：n%sn,cipher);printf(nDecrypt:n);OFB_DeEncrypt(cipher,key,OFB_plain);printf(%sn,OFB_plain);return OK;void main()int i=0;char buttern;loop:printf(chose the mode of desn);printf(1 CFB 2 OFBn);scanf(%d,&i);if(i=1)CFB();else OFB();printf(Do you want to continunen(Y/N)n);scanf(%c,&buttern);if(buttern=y)goto loop;名师资料总结-精品资料欢迎下载-名师精心整理-第 12 页，共 12 页 -