DESCFBandOFB模式文件.doc

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1、#include “stdio.h“ #include “memory.h“ #include “time.h“ #include “stdlib.h“ #include“string.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,

2、 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 ;/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,

3、 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 ;/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,

4、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, 25;/p 盒置换表/S 盒 int S8416 =/S114,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,0,15,

5、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,/S215,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5,0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15,13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9,/S310,0,9,14,6,3,15,5,1,13,12,7,11,4

6、,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,/S47,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9,10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4,3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14,/S52,12,4,1,7,10,11,6,8,5,

7、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,/S612,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8,9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6,4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13,/S74,11,2,14,15,

8、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,/S813,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2,7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11; /置换选择

9、 1int 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, 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,

10、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 BitToByte(ElemType bit8,ElemType *ch);/二进制转换成字节

11、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 void DES_ROL(ElemType data56, int time

12、);/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 count); void DES_Swap(ElemTy

13、pe 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 DES_Decrypt(char

14、*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)int cnt; for(cnt = 0;cnt cnt) /二进制转换成字节 void BitToByte(ElemT

15、ype bit8,ElemType *ch) int cnt; for(cnt = 0;cnt 3; datacur2+1 = (output datacur2+2 = (output datacur2+3 = output /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 plainBlock

16、8, 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); /将右半部分进行扩展置换，从 32 位扩展到 48 位 DES_E_Transform(copyRig

17、ht); /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）DES_IP_1_Transform(cipherBits); Bit64ToC

18、har8(cipherBits,plainBlock); int DES_Encrypt(ElemType 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); Char8ToB

19、it64(cipherBlock,cipherBits); for(int i=0;i8;i+) Sfristi=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);

20、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;BitToByte(Cbit, printf(“cipher：n%sn“,cipher);return 0; int CFB_Decrypt(ElemType CFB_plain100,ElemType key8,ElemType cipher100) ElemType cipherbit8;

21、 ElemType Sfrist8,Pbit8; ElemType 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, printf(“%sn“,CFB_pl

22、ain); return 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“,printf(“pleas

23、e interput key(8)n“);scanf(“%s“, 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

24、_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=Sfristj;BitToByte(Cbit, return 0; int OFB() ElemType plain100=0,OFB_plain100=0,plainbit8,key8,cipher1

25、00=0;printf(“ DES in OFB moden“); printf(“plesse interput plainn“); scanf(“%s“, printf(“please interput key(8)n“);scanf(“%s“,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“, if(i=1)CFB();else OFB(); printf(“Do you want to continunen(Y/N)n“); scanf(“%c“, if(buttern=y) goto loop;