DES算法(基于C语言,加密解密代码)

.//*Note:YourchoiceisCIDE*/#include"stdio.h"#include"string.h"#defineucharunsignedchar/**********************************************************************************************************明文转换声明部分*******************************///IP1置换表intIP_1[64]={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};//IP2逆置换表intIP_2[64]={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};//E扩展置换表intE_case[48]={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};//S盒压缩intS1[4][16]={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};intS2[4][16]={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};intS3[4][16]={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};intS4[4][16]={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};intS5[4][16]={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};intS6[4][16]={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};intS7[4][16]={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};intS8[4][16]={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};//P盒置换intPermute[32]={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};/******************************************************************************************************字节与二进制相互变换部分********************************************************************************************************///字节转换成二进制intByteToBit<charch,charbit[8]>{ ucharx;for<x=0;x<8;x++>{*<bit+x>=<<ch<<x>&0x80>>>7;}return0;}//字符串转换成二进制位串intChar8ToBit64<charch[8],charbit[64]>{ ucharx;for<x=0;x<8;x++>{ ByteToBit<*<ch+x>,bit+<x<<3>>;}return0;}//二进制转换成字节intBitToByte<charbit[8],char*ch>{ ucharx;for<x=0;x<8;x++>{*ch|=*<bit+x><<<7-x>;}return0;}//将二进制串转换成字符串intBit64ToChar8<charbit[64],charch[8]>{ ucharx; memset<ch,0,8>;//把ch[8]全部清零。for<x=0;x<8;x++>{ BitToByte<bit+<x<<3>,ch+x>;}return0;}/***********************************************************************************************************************密钥声明部分********************************************///密钥PC—1置换表intPC_1[56]={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}; //密钥PC—2置换表intPC_2[48]={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};//密钥每次轮回移位表ucharLeft_Move[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};/***********************************************************************************************************************密钥的生成函数部分****************************************************************************************************************************///PC-1置换函数intPC1_permute<charpc1[64],charPC1_Buff[56]>{ ucharx;for<x=0;x<56;x++>{ PC1_Buff[x]=pc1[PC_1[x]-1];}return0;}//PC密钥左移intKeyLeftMove<charpcB[56],charMove>{ ucharx;charCn[28],Dn[28];chara_buff,b_buff,c_buff,d_buff;//**********PC-1密钥56位分离成左右各28位**************memcpy<Cn,pcB,28>;memcpy<Dn,pcB+28,28>;//*****************PC密钥左移部分******************* a_buff=Cn[0]; b_buff=Dn[0];if<2==Move>{ c_buff=Cn[1]; d_buff=Dn[1];}for<x=0;x<28;x++>{if<27==x>{if<1==Move>{ Cn[27]=a_buff; Dn[27]=b_buff;}if<2==Move>{ Cn[26]=a_buff; Cn[27]=c_buff; Dn[26]=b_buff; Dn[27]=d_buff;}}else{ Cn[x]=Cn[x+Move]; Dn[x]=Dn[x+Move];}}//******************28bit合成56bit********************memcpy<pcB,Cn,28>;memcpy<pcB+28,Dn,28>;return0;}//PC-2逆置换函数intPC2_permut<charpc2[56],charPC2_Buff[48]>{ ucharx;for<x=0;x<48;x++>{ PC2_Buff[x]=pc2[PC_2[x]-1];}return0;}//产生16轮的子密钥函数intKey16Itera<charkey[64],charsubKeys[16][48]>{ ucharx,move;chartemp1[56]; PC1_permute<key,temp1>;//PC1置换,返回值tempfor<x=0;x<16;x++>{ move=Left_Move[x]; KeyLeftMove<temp1,move>;//移位,返回值temp,56bit PC2_permut<temp1,subKeys[x]>;}return0;}/*******************************************************************************************************************明文加密函数部分**************************************///IP置换intIP1_permute<charIP1[64]>{ ucharx;charIP1Buff[64];for<x=0;x<64;x++>{ IP1Buff[x]=IP1[IP_1[x]-1];} memcpy<IP1,IP1Buff,64>;return0;}//32bit经E盒扩展成48bitintR_Expand48bit<charR[32],charRE[48]>{ ucharx;for<x=0;x<48;x++>{ RE[x]=R[E_case[x]-1];}return0;}//IP64逆置换intIP2_permute<charIP2[64]>{ ucharx;chartemp2[64];for<x=0;x<64;x++>{ temp2[x]=IP2[IP_2[x]-1];} memcpy<IP2,temp2,64>;return0;}//经P盒置换intPcase<charS8Byte[32]>{ ucharx;chartemp3[32];for<x=0;x<32;x++>{ temp3[x]=S8Byte[Permute[x]-1];} memcpy<S8Byte,temp3,32>;return0;}//经S盒压缩成32bitintReduceto32bit<charEKey[48],charS32bit[32]>{ ucharx,Rank,Line;intout;for<x=0;x<8;x++>{Rank=<EKey[1+6*x]<<3>|<EKey[2+6*x]<<2>|<EKey[3+6*x]<<1>|<EKey[4+6*x]>;Line=<EKey[6*x]<<1>|<EKey[5+6*x]>;//在S盒寻找需要的数if<0==x>{out=S1[Line][Rank];}if<1==x>{out=S2[Line][Rank];}if<2==x>{out=S3[Line][Rank];}if<3==x>{out=S4[Line][Rank];}if<4==x>{out=S5[Line][Rank];}if<5==x>{out=S6[Line][Rank];}if<6==x>{out=S7[Line][Rank];}if<7==x>{out=S8[Line][Rank];}//把一位数拆成数四位数S32bit[4*x+0]=<<<char><out>>&0x08>>>3;S32bit[4*x+1]=<<<char><out>>&0x04>>>2;S32bit[4*x+2]=<<<char><out>>&0x02>>>1;S32bit[4*x+3]=<<<char><out>>&0x01>;}return0;}/*******************明文16次迭代,加密,********************************************输入值：mw[64]\子密钥：miyue[16][48]***********************************************返回值：data[64]***********************/intEncryp<chardata[64],charZkey16[16][48]>{ ucharx,y;charLeft[32],Right[32],EKbuff[48];charSE32bit[32]; IP1_permute<data>;//IP置换 memcpy<Left,data,32>;//分离32bit memcpy<Right,data+32,32>;for<x=0;x<16;x++>{ R_Expand48bit<Right,EKbuff>;//E盒扩展for<y=0;y<48;y++>//与密钥异或{ EKbuff[y]^=Zkey16[x][y];} Reduceto32bit<EKbuff,SE32bit>;//经S盒压缩32bit,返回值SE32bit Pcase<SE32bit>;//经P盒置换,返回值SE32bit for<y=0;y<32;y++>//与左半部分Left32bit异或{ SE32bit[y]^=Left[y];} memcpy<Left,Right,32>; memcpy<Right,SE32bit,32>;} memcpy<data,Right,32>;//合成64bit memcpy<data+32,Left,32>; IP2_permute<data>;//IP逆置换return0;}/**********************密文输入,解密,16次迭代**************************************************输入值：miwen[64]*******************************************************输出值：mw[64]******************************/intDecryp<charmiwen[64],charD_Zkey16[16][48]>{ ucharx,y;charD_Left[32],D_Right[32];charD_EKbuff[48],D_SE32bit[32]; IP1_permute<miwen>;//IP1置换。 memcpy<D_Left,miwen,32>;//分离32bit memcpy<D_Right,miwen+32,32>; for<x=16;x>0;x-->//16轮迭代{ R_Expand48bit<D_Right,D_EKbuff>;//E盒扩展for<y=0;y<48;y++>//与密钥异或{ D_EKbuff[y]^=D_Zkey16[x-1][y];} Reduceto32bit<D_EKbuff,D_SE32bit>;//经S盒压缩32bit,返回值D_SE32bit。 Pcase<D_SE32bit>;//经P盒置换,返回值SE32bitfor<y=0;y<32;y++>{ D_SE32bit[y]^=D_Left[y];} memcpy<D_Left,D_Right,32>; memcpy<D_Right,D_SE32bit,32>; } memcpy<miwen,D_Right,32>;//合成64bit memcpy<miwen+32,D_Left,32>; IP2_permute<miwen>;//IP逆置换return0;}/*************************************主函数部分*********************************/intmain<void>{ucharx;charMingW64bit[64],MingW8Byte[8];charKey64bit[64],Key8Byte[8];charKey16[16][48],temp2[64];charMybuff[8];printf<"请输入密钥：\n">;scanf<"%s",Key8Byte>;Char8ToBit64<Key8Byte,Key64bit>;//密钥字符串置换成二进制串for<x=0;x<8;x++>//补偿足8位奇偶校验位{ memcpy<temp2+8*x,Key64bit+7*x,7>; temp2[x*8+7]=1;}mem