2022年DESCFBandOFB模式文件 .pdf

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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,

2、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 ;/ 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, 1

3、4, 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 ;/ 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, 2

4、0, 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, 25 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - -

5、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, 0,14

6、,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,

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, /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,

8、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, /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、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; /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,

10、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 ; /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,

11、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 BitToByte(ElemType bit8,ElemType *ch);/二进制转换成字节void Char8ToBit64(ElemType ch8,ElemType bit64);/将长度为8

12、 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void DES_ROL(ElemType data56, int time);/密钥移动方法void DES_IP_Transform(ElemType data64);/初始变换void

13、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 count); void DES_Swap(ElemType left32,ElemType right32); void DES_EncryptBlock(ElemType plainB

14、lock8, 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 DES_Decrypt(char *cipherFile, char *keyStr,char *plainFile); /解密方法int CFB_Decrypt(El

15、emType 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 =

16、0;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

17、 bit64,ElemType ch8) int 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

18、左移DES_PC2_Transform(temp,subKeyscnt);/PC2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

19、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_ROL(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(dat

20、a+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 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 data6

21、4) 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_Transform(ElemType data48) int cnt; ElemType temp48; for(cnt = 0;

22、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) int cnt; for(cnt = 0; cnt count; cn

23、t+) 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) + datacu

24、r1+5;/每组第一位乘2 加上第六位row = (datacur1+13) + (datacur1+22) + (datacur1+33; datacur2+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

25、void DES_EncryptBlock(ElemType plainBlock8, ElemType subKeys1648, ElemType cipherBlock8) ElemType 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

26、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 -

27、 - -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(ElemType IV64,ElemType key8,ElemType Sfrist8) ElemType IVBlock64,bKey8,subKeys1648,cipherBlock8,cipherBits64; Bit6

28、4ToChar8(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=cipherBitsi; return OK; int CFB_Encrypt(ElemType plain100,ElemType key8,ElemType cipher100) ElemType p

29、lainbit8; 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 j=0;j8;j+) Cbitj=plainbitjSfristj; for(j=0;j56;j+) IVj=IVj+8; for(j=0;j8;j+) IVj+56=Cbitj

30、; 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; ElemTyp

31、e 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

32、0; int CFB() /* 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 -

33、 - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 10 页，共 12 页 - - - - - - - - - printf(please interput 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 cipher1

34、00) 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 j=0;j8;j+) Cbitj=plainbitjSfristj; for(j=0;j56;j+) IVj=IVj+8; for(j=0;j8;j

35、+) IVj+56=Sfristj; BitToByte(Cbit,&cipheri); return 0; int OFB() ElemType plain100=0,OFB_plain100=0,plainbit8,key8,cipher100=0; printf( 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 - - - - - - - - - - - - -

36、 - - - - - 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 - - - - - - - - -