DES算法C++实现 VC程序

/*---------------------------------------------------------------- // Copyright (C) 2008 尹学渊 // 版权所有。 // // 文件名：yxyDES2.cpp // 文件功能描述：DES2加密类 cpp文件 // // // 创建人：尹学渊 // // 修改人： // 修改描述： // // 修改人： // 修改描述： //----------------------------------------------------------------*/ //#include "stdafx.h" #include "yxyDES2.h" // permuted choice table (PC1) const static char PC1_Table[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 }; // permuted choice key (PC2) const static char PC2_Table[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 }; // number left rotations of pc1 const static char Shift_Table[16] = { 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1 }; // initial permutation (IP) const static char IP_Table[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 }; // expansion operation matrix (E) const static char E_Table[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 }; // The (in)famous S-boxes const static char S_Box[8][4][16] = { // 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, 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, 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, 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, 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 }; // 32-bit permutation function P used on the output of the S-boxes const static char P_Table[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 }; // final permutation IP^-1 const static char IPR_Table[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 }; yxyDES2::yxyDES2() { memset(szCiphertextRaw,0,64); memset(szPlaintextRaw,0,64); memset(szCiphertextInBytes,0,8); memset(szPlaintextInBytes,0,8); memset(szCiphertextInBinary,0,65); memset(szCiphertextInHex,0,17); memset(szPlaintext,0,9); memset(szFCiphertextAnyLength,0,8192); memset(szCiphertextInHex,0,8192); } yxyDES2::~yxyDES2() { } void yxyDES2::InitializeKey(char* srcBytes,unsigned int keyN) { //convert 8 char-bytes key to 64 binary-bits char sz_64key[64] = {0}; Bytes2Bits(srcBytes,sz_64key,64); //PC 1 char sz_56key[56] = {0}; for(int k=0;k<56;k++) { sz_56key[k] = sz_64key[PC1_Table[k]-1]; } CreateSubKey(sz_56key,keyN); } void yxyDES2::CreateSubKey(char* sz_56key,unsigned int keyN) { char szTmpL[28] = {0}; char szTmpR[28] = {0}; char szCi[28] = {0}; char szDi[28] = {0}; memcpy(szTmpL,sz_56key,28); memcpy(szTmpR,sz_56key + 28,28); for(int i=0;i<16;i++) { //shift to left //Left 28 bits memcpy(szCi,szTmpL + Shift_Table[i],28 - Shift_Table[i]); memcpy(szCi + 28 - Shift_Table[i],szTmpL,Shift_Table[i]); //Right 28 bits memcpy(szDi,szTmpR + Shift_Table[i],28 - Shift_Table[i]); memcpy(szDi + 28 - Shift_Table[i],szTmpR,Shift_Table[i]); //permuted choice 48 bits key char szTmp56[56] = {0}; memcpy(szTmp56,szCi,28); memcpy(szTmp56 + 28,szDi,28); for(int j=0;j<48;j++) { szSubKeys[keyN][i][j] = szTmp56[PC2_Table[j]-1]; } //Evaluate new szTmpL and szTmpR memcpy(szTmpL,szCi,28); memcpy(szTmpR,szDi,28); } } void yxyDES2::EncryptData(char* _srcBytes,unsigned int keyN) { char szSrcBits[64] = {0}; char sz_IP[64] = {0}; char sz_Li[32] = {0}; char sz_Ri[32] = {0}; char sz_Final64[64] = {0}; Bytes2Bits(_srcBytes,szSrcBits,64); //IP InitialPermuteData(szSrcBits,sz_IP); memcpy(sz_Li,sz_IP,32); memcpy(sz_Ri,sz_IP + 32,32); for(int i=0;i<16;i++) { FunctionF(sz_Li,sz_Ri,i,keyN); } //so D=LR memcpy(sz_Final64,sz_Ri,32); memcpy(sz_Final64 + 32,sz_Li,32); //~IP for(int j=0;j<64;j++) { szCiphertextRaw[j] = sz_Final64[IPR_Table[j]-1]; } Bits2Bytes(szCiphertextInBytes,szCiphertextRaw,64); } void yxyDES2::DecryptData(char* _srcBytes,unsigned int keyN) { char szSrcBits[64] = {0}; char sz_IP[64] = {0}; char sz_Li[32] = {0}; char sz_Ri[32] = {0}; char sz_Final64[64] = {0}; Bytes2Bits(_srcBytes,szSrcBits,64); //IP --- return is sz_IP InitialPermuteData(szSrcBits,sz_IP); //divide the 64 bits data to two parts memcpy(sz_Ri,sz_IP,32); //exchange L to R memcpy(sz_Li,sz_IP + 32,32); //exchange R to L //16 rounds F and xor and exchange for(int i=0;i<16;i++) { FunctionF(sz_Ri,sz_Li,15-i,keyN); } memcpy(sz_Final64,sz_Li,32); memcpy(sz_Final64 + 32,sz_Ri,32); // ~IP for(int j=0;j<64;j++) { szPlaintextRaw[j] = sz_Final64[IPR_Table[j]-1]; } Bits2Bytes(szPlaintextInBytes,szPlaintextRaw,64); } void yxyDES2::FunctionF(char* sz_Li,char* sz_Ri,unsigned int iKey,unsigned int keyN) { char sz_48R[48] = {0}; char sz_xor48[48] = {0}; char sz_P32[32] = {0}; char sz_Rii[32] = {0}; char sz_Key[48] = {0}; char s_Compress32[32] = {0}; memcpy(sz_Key,szSubKeys[keyN][iKey],48); ExpansionR(sz_Ri,sz_48R); XOR(sz_48R,sz_Key,48,sz_xor48); CompressFuncS(sz_xor48,s_Compress32); PermutationP(s_Compress32,sz_P32); XOR(sz_P32,sz_Li,32,sz_Rii); memcpy(sz_Li,sz_Ri,32); memcpy(sz_Ri,sz_Rii,32); } void yxyDES2::InitialPermuteData(char* _src,char* _dst) { //IP