DES加密算法与解密(带流程图)

《DES加密算法与解密(带流程图)》由会员分享，可在线阅读，更多相关《DES加密算法与解密(带流程图)（10页珍藏版）》请在装配图网上搜索。

1、. . 一、DES加密与解密算法程序源代码：#include using namespace std;const static char IP_Table = /IP_Table置换 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,

2、 13, 5, 63, 55, 47, 39, 31, 23, 15, 7; const static char Final_Table = /最终置换 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,

3、 41, 9, 49, 17, 57, 25;const static char S_Box864 = /s_box /* 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,

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

6、 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

7、, 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, /* 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,

8、 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, 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,

9、 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11;const static char Rar_Table = /压缩置换 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;const static char Exp_Table = /扩展置换 32, 1

10、, 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;const static char P_Table=/P置换 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

11、, 22, 11, 4, 25;const static char KeyRar_Table= 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;/设置全局变量，16轮密钥bool key1648=0;void ByteTo

12、Bit(bool *Out,char *In,int bits)/字节到位转换函数int i;for(i=0;i(i%8)&1;void BitToByte(char *Out,bool *In,int bits)/位到字节转换函数int i;for(i=0;ibits/8;i+)Outi=0;for(i=0;ibits;i+)Outi/8|=Ini(i%8);void Xor(bool *InA,const bool *InB,int length) /按位异或for(int i=0;ilength;i+)InAi=InBi;void keyfc(char *In) /密钥生成函数int i

13、,j=0,mov,k,m;bool* key0 = new bool56;bool* keyin = new bool64;bool temp;ByteToBit(keyin,In,64); /字节到位的转换for(i=0;i56;i+) /密钥压缩为56位key0i=keyinKeyRar_Tablei-1;for(i=0;i16;i+) /16轮密钥产生if(i=0|i=1|i=8|i=15)mov=1;elsemov=2;for(k=0;kmov;k+) /分左右两块循环左移for(m=0;m8;m+)temp=key0m*7;for(j=m*7;jm*7+7;j+)key0j=key0

14、j+1;key0m*7+6=temp;temp=key00;for(m=0;m27;m+)key0m=key0m+1;key027=temp;temp=key028;for(m=28;m55;m+)key0m=key0m+1;key055=temp;for(j=0;j48;j+) /压缩置换并储存 keyij=key0Rar_Tablej-1;delete key0;delete keyin;void DES(char Out8,char In8,bool Type)/加密核心程序,Type=0时加密，反之解密bool* MW = new bool64;bool* tmp = new bool

15、32;bool* PMW = new bool64;bool* kzmw = new bool48;bool* keytem = new bool48;bool* ss = new bool32;int hang,lie,i;ByteToBit(PMW,In,64);for(int j=0;j64;j+)MWj=PMWIP_Tablej-1; /初始置换bool *Li=&MW0,*Ri=&MW32;for(i=0;i48;i+)/右明文扩展置换kzmwi=RiExp_Tablei-1;if(Type=0)/DES加密过程for(int lun=0;lun16;lun+)for(i=0;i32

16、;i+)ssi=Rii;for(i=0;i48;i+)/右明文扩展置换kzmwi=RiExp_Tablei-1;for(i=0;i48;i+)keytemi=keyluni;Xor(kzmw,keytem,48);/*S盒置换*/for(i=0;i8;i+)hang=kzmwi*6*2+kzmwi*6+5;lie =kzmwi*6+1*8+kzmwi*6+2*4+kzmwi*6+3*2+kzmwi*6+4;tmpi*4+3=S_Boxi(hang+1)*16+lie%2;tmpi*4+2=(S_Boxi(hang+1)*16+lie/2)%2;tmpi*4+1=(S_Boxi(hang+1)*

17、16+lie/4)%2;tmpi*4=(S_Boxi(hang+1)*16+lie/8)%2;for(i=0;i32;i+)/P置换Rii=tmpP_Tablei-1;Xor(Ri,Li,32);/异或for(i=0;i32;i+)/交换左右明文Lii=ssi;for(i=0;i32;i+)tmpi=Lii;Lii=Rii;Rii=tmpi;for(i=0;i=0;lun-)for(i=0;i32;i+)ssi=Rii;for(i=0;i48;i+)/右明文扩展置换kzmwi=RiExp_Tablei-1;for(i=0;i48;i+)keytemi=keyluni;Xor(kzmw,keyt

18、em,48);/*S盒置换*/for(i=0;i8;i+)hang=kzmwi*6*2+kzmwi*6+5;lie =kzmwi*6+1*8+kzmwi*6+2*4+kzmwi*6+3*2+kzmwi*6+4;tmpi*4+3=S_Boxi(hang+1)*16+lie%2;tmpi*4+2=(S_Boxi(hang+1)*16+lie/2)%2;tmpi*4+1=(S_Boxi(hang+1)*16+lie/4)%2;tmpi*4=(S_Boxi(hang+1)*16+lie/8)%2;for(i=0;i32;i+)/P置换Rii=tmpP_Tablei-1;Xor(Ri,Li,32);/异

19、或for(i=0;i32;i+)/交换左右明文Lii=ssi;for(i=0;i32;i+)tmpi=Lii;Lii=Rii;Rii=tmpi;for(i=0;i64;i+)PMWi=MWFinal_Tablei-1;BitToByte(Out,PMW,64);/位到字节的转换delete MW;delete tmp;delete PMW;delete kzmw;delete keytem;delete ss;bool RunDes(char *Out, char *In, int datalength, char *Key, bool Type) /加密运行函数，判断输入以与对输入文本8字节

20、分割 if( !( Out & In & Key & (datalength=(datalength+7)&0xfffffff8) ) ) return false;keyfc(Key);for(int i=0,j=datalength%8; ij; +i,Out+=8,In+=8)DES(Out, In, Type);return true;int main()char* Ki = new char8;char Enter=This is the test of DES!;char* Print = new char200;int len = sizeof(Enter);int i_mf;c

21、out 请输入密钥（8位）： n;for(i_mf=0;i_mf Kii_mf;cout n;RunDes(Print,Enter,len,Ki,0);/加密cout -加密前- n;for(i_mf=0;i_mflen;i_mf+)cout Enteri_mf;cout nn;cout -加密后- n;for(i_mf=0;i_mflen;i_mf+)coutPrinti_mf;cout nn;/此处进行不同密钥输入测试cout 请输入密钥（8位）： n;for(i_mf=0;i_mf Kii_mf;cout n;RunDes(Enter,Print,len,Ki,1);/解密cout -解密后- n;for(i_mf=0;i_mflen;i_mf+)cout Enteri_mf;cout endl;delete Ki;delete Print;return 0;二、程序编译、运行结果图：三、程序总体框架图：四、程序实现流程图：10 / 10