C语言的DES和3DES算法-能真正运行.docx

Linux下c语言实现DES和3DES算法(2010-12-09 20:56:21) 转载标签： linuxcdes3des加解密对称算法it分类： IT技术 一、DES算法理论 DES算法属于对称加密算法，在一些对安全性要求较高的交易中运用广泛，如支付行业等。关于DES算法的理论，网上有很多文章都有详细的讲解，写得很好，我这里不再赘述，这里给出链接：/document/viewdoc/?id=623，请朋友们自己去学习，我的代码也是依据这里的理论写的。二、实现环境及文件 a、环境：Redhat Linux + c b、实现文件：des.h des.c makefile三、代码 1、des.h文件/功能：实现DES及3DES加解密的算法/作者：XXX/日期：2008-9-23#ifndef DES_H#define DES_Hstatic int pc_1_table56=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;static int pc_2_table48=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;static int ls_num_table16=1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1;static 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, 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;static 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, 2,42,10,50,18,58,26, 33, 1,41, 9,49,17,57,25;static 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;static 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;static int s_box_table8416=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, 6,13,15, 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, 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, 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, 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, 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, 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, 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 ;/函数声明int Do_DES(char* strSrc, char* strKey, char* strDest, char flag);#endif2、des.c文件/功能：实现DES及3DES加解密的算法/作者：XXX/日期：2008-9-23#include #include #include #include des.h/函数声明int Do_DES(char* strSrc, char* strKey, char* strDest, char flag);int Do_3DES(char* strSrc, char* strKey, char* strDest, char flag);/主函数int main(int argc, char* argv) char src1616+1,key1616+1,key4848+1,dest1616+1; if(argc != 3) fprintf(stderr,Usage: %s -e|-d s|3n,argv0); exit(1); if(strcmp(argv2,-s) = 0) if(strcmp(argv1,-e) = 0) fprintf(stderr,Please input the string that you want to encrypt(16 hex number):n); memset(src16,0,sizeof(src16); scanf(%s,src16); fprintf(stderr,Please input the Key string(16 hex number):n);memset(key16,0,sizeof(key16); scanf(%s,key16); memset(dest16,0,sizeof(dest16); Do_DES(src16,key16,dest16,e); fprintf(stderr,Result: %sn,dest16); else if(strcmp(argv1,-d) = 0) fprintf(stderr,Please input the string that you want to decrypt(16 hex number):n); memset(src16,0,sizeof(src16); scanf(%s,src16); fprintf(stderr,Please input the Key string(16 hex number):n);memset(key16,0,sizeof(key16); scanf(%s,key16); memset(dest16,0,sizeof(dest16); Do_DES(src16,key16,dest16,d); fprintf(stderr,Result: %sn,dest16); else return -1; else if(strcmp(argv2,-3) = 0) if(strcmp(argv1,-e) = 0) fprintf(stderr,Please input the string that you want to encrypt(16 hex number):n); memset(src16,0,sizeof(src16); scanf(%s,src16); fprintf(stderr,Please input the Key string(16 hex number):n); memset(key48,0,sizeof(key48); scanf(%s,key48); memset(dest16,0,sizeof(dest16); Do_3DES(src16,key48,dest16,e); fprintf(stderr,Result: %sn,dest16); else if(strcmp(argv1,-d) = 0) fprintf(stderr,Please input the string that you want to decrypt(16 hex number):n); memset(src16,0,sizeof(src16); scanf(%s,src16); fprintf(stderr,Please input the Key string(16 hex number):n); memset(key48,0,sizeof(key48); scanf(%s,key48); memset(dest16,0,sizeof(dest16); Do_3DES(src16,key48,dest16,d); fprintf(stderr,Result: %sn,dest16); else return -1; elsereturn -1; return 0;/做DES加密或解密运算int Do_DES(char* strSrc, char* strKey, char* strDest, char flag)int i,j; unsigned char subKey1648+1,byte88+1,bits64+1,strTmp64+1; unsigned char L032+1,R032+1,Lx32+1,Rx32+1; if(!( flag = e | flag = E | flag = d | flag = D) return -1; if(strSrc = NULL | strKey = NULL) return -2; if(flag = e | flag = E) memset(byte8,0,sizeof(byte8); BCDToByte(strKey, 16, byte8); memset(bits,0,sizeof(bits); ByteToBit(byte8, 8, bits); Des_GenSubKey(bits,subKey); BCDToByte(strSrc, 16, byte8); ByteToBit(byte8, 8, bits); Des_IP(bits, strTmp); memcpy(L0,strTmp,32); memcpy(R0,strTmp+32,32); for(i=0;i16;i+) memcpy(Lx,R0,32); Des_F(R0,subKeyi,Rx); Do_XOR(L0,32,Rx); memcpy(L0,Lx,32); memcpy(R0,Rx,32); memcpy(bits,R0,32); memcpy(bits+32,L0,32); Des_IP_1(bits,strTmp); BitToByte(strTmp,64,byte8); ByteToBCD(byte8,8,strDest); else memset(byte8,0,sizeof(byte8); BCDToByte(strKey, 16, byte8); memset(bits,0,sizeof(bits); ByteToBit(byte8, 8, bits); Des_GenSubKey(bits,subKey); BCDToByte(strSrc, 16, byte8); ByteToBit(byte8, 8, bits); Des_IP(bits, strTmp); memcpy(L0,strTmp,32); memcpy(R0,strTmp+32,32); for(i=0;i16;i+) memcpy(Lx,R0,32); Des_F(R0,subKey15-i,Rx); Do_XOR(L0,32,Rx); memcpy(L0,Lx,32); memcpy(R0,Rx,32); memcpy(bits,R0,32); memcpy(bits+32,L0,32); Des_IP_1(bits,strTmp); BitToByte(strTmp,64,byte8); ByteToBCD(byte8,8,strDest); return 0;/做3DES加密或解密运算int Do_3DES(char* strSrc, char* strKey, char* strDest, char flag) unsigned char strBCDKey32+1,strByteKey16+1; unsigned char strMidDest116+1,strMidDest216+1; unsigned char strLKey16+1,strMKey16+1,strRKey16+1; if(!( flag = e | flag = E | flag = d | flag = D) return -1; if(strSrc = NULL | strKey = NULL) return -2; if(strlen(strKey) 32) return -3; if(flag = e | flag = E) memset(strBCDKey,0,sizeof(strBCDKey); memcpy(strBCDKey,strKey,32); memset(strLKey,0,sizeof(strLKey); memcpy(strLKey,strBCDKey,16); memset(strRKey,0,sizeof(strRKey); memcpy(strRKey,strBCDKey+16,16); Do_DES(strSrc,strLKey,strMidDest1,e); Do_DES(strMidDest1,strRKey,strMidDest2,d); Do_DES(strMidDest2,strLKey,strMidDest1,e); memcpy(strDest,strMidDest1,16); else memset(strBCDKey,0,sizeof(strBCDKey); memcpy(strBCDKey,strKey,32); memset(strLKey,0,sizeof(strLKey); memcpy(strLKey,strBCDKey,16); memset(strRKey,0,sizeof(strRKey); memcpy(strRKey,strBCDKey+16,16); Do_DES(strSrc,strLKey,strMidDest1,d); Do_DES(strMidDest1,strRKey,strMidDest2,e); Do_DES(strMidDest2,strLKey,strMidDest1,d); memcpy(strDest,strMidDest1,16); return 0;/对输入的字节串作BCD编码扩展int ByteToBCD(unsigned char* bytes, int count,unsigned char* strBCD) unsigned char cTmp; int i; for(i=0;i 4; strBCDi*2 = (cTmp 9) ? cTmp - 10 + A : cTmp + 0; cTmp = bytesi & 0x0F; strBCDi*2+1 = (cTmp 9) ? cTmp - 10 + A : cTmp + 0; return (count*2);/把输入的BCD编码串还原成字节串int BCDToByte(unsigned char* strBCD, int count, unsigned char* bytes) unsigned char cTmp; int i; for(i=0;i= A & cTmp = a & cTmp = f) cTmp = cTmp - a + 10; else cTmp &= 0x0F; bytesi = cTmp = A & cTmp = a & cTmp = f) cTmp = cTmp - a + 10; else cTmp &= 0x0F; bytesi += cTmp; return (count/2);/把字节串变成比特串int ByteToBit(unsigned char* bytes, int count, unsigned char* strBit) unsigned char cTmp; int i,j; for(i=0;icount;i+) cTmp = 0x80; for(j=0;j (7-j); cTmp = cTmp 1; return (count*8);/把比特串变成字节串int BitToByte(unsigned char* strBit, int count, unsigned char* bytes) unsigned char cTmp; int i,j; for(i=0;i(count/8);i+) cTmp = 0x00; for(j=0;j8;j+) cTmp += (strBiti*8+j (7-j); bytesi = cTmp; return (count/8);/做异或操作int Do_XOR(unsigned char* strSrc, int count, unsigned char* strDest) int i; if(strSrc = NULL | strDest = NULL) return -1; for(i=0;icount;i+) strDesti = strSrci; return 0;/des算法PC-1变换，把64比特的密钥K变换成56比特int Des_PC_1(unsigned char* strIn, unsigned char* strOut) int i; for(i=0;i56;i+) strOuti = strInpc_1_tablei-1; return 56;/des算法PC-2变换，把56比特变换成48比特int Des_PC_2(unsigned char* strIn, unsigned char* strOut) int i; for(i=0;i48;i+) strOuti = strInpc_2_tablei-1; return 48;/des算法的循环左移位运算int Des_LS(unsigned char* strIn, int count, unsigned char* strOut) int i; for(i=0;i28;i+) strOuti = strIn(i+count)(; return 28;/des算法中通过父密钥产生16个48比特位的子密钥int Des_GenSubKey(unsigned char* strKey, unsigned char strSubKey1648+1) unsigned char tmp56+1,C028+1,D028+1,Cx28+1,Dx28+1; int i,j; memset(tmp,0,sizeof(tmp); memset(C0,0,sizeof(C0); memset(D0,0,sizeof(D0); memset(Cx,0,sizeof(Cx); memset(Dx,0,sizeof(Dx); Des_PC_1(strKey, tmp); memcpy(C0,tmp,28); memcpy(D0,tmp+28,28); for(i=0;i16;i+) Des_LS(C0,ls_num_tablei,Cx); Des_LS(D0,ls_num_tablei,Dx); memcpy(tmp,Cx,28); memcpy(tmp+28,Dx,28); Des_PC_2(tmp,strSubKeyi); memcpy(C0,Cx,28); memcpy(D0,Dx,28); return 0;/des算法IP置换int Des_IP(unsigned char* strIn, unsigned char* strOut) int i; for(i=0;i64;i+) strOuti = strInip_tablei-1; return 64;/des算法IP-1置换int Des_IP_1(unsigned char* strIn, unsigned char* strOut) int i; for(i=0;i64;i+) strOuti = strInip_1_tablei-1; return 64;/des算法e变换，将32比特变成48比特int Des_E(unsigned char* strIn, unsigned char* strOut) int i; for(i=0;i48;i+) strOuti = strIne_tablei-1; return 48;/des算法P变换int Des_P(unsigned char* strIn, unsigned char* strOut) int i; for(i=0;i32;i+) strOuti = strInp_tablei-1; return 32;/des算法S盒变换int Des_S_Box(unsigned char* strIn, int nSBox, unsigned char* strO