DES算法代码

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这是之前的一篇文章，今天才发现之前没有把内容放进来。真是晕头了。幸好看了看评论，有人指出来了。实在是不好意思。现在把代码补上来；声明，不是我自己完全原创的。也是从网上找到一个别人的东西，然后改造了一下。#ifndef CDES_H_CAESAR__DEF#define CDES_H_CAESAR__DEF/*! /Brief CDES类说明 * * 该类是DES和3DES算法类 */class CDES {public:CDES();virtual ~CDES();//加密解密enum{ENCRYPT= 0,//! 加密DECRYPT,//! 解密};//DES算法的模式enum{ECB=0,//! ECB模式CBC//! CBC模式};typedef bool (*PSubKey)[16][48];//Pad填充的模式enum{PAD_ISO_1 =0,//! ISO_1填充：数据长度不足8比特的倍数，以0x00补足，如果为8比特的倍数，补8个0x00PAD_ISO_2,//! ISO_2填充：数据长度不足8比特的倍数，以0x80,0x00..补足，如果为8比特的倍数，补0x80,0x00..0x00PAD_PKCS_7//! PKCS7填充：数据长度除8余数为n,以(8-n)补足为8的倍数};/* /Brief 补足8位数据 * * Description：根据协议对加密前的数据进行填充 * @param nType :类型：PAD类型 * @param In :数据串指针 * @param Out :填充输出串指针 * @param datalen :数据的长度 * @param padlen :(in,out)输出buffer的长度，填充后的长度 * @return true--成功；false--失败； */static boolRunPad(int nType,const unsigned char* In, unsigned datalen,unsigned char* Out,unsigned& padlen);/* /Brief 执行DES算法对文本加解密 * * Description ：执行DES算法对文本加解密 * @param bType : 类型：加密ENCRYPT，解密DECRYPT * @param bMode : 模式：ECB,CBC * @param In :待加密串指针 * @param Out :待输出串指针 * @param datalen :待加密串的长度，同时Out的缓冲区大小应大于或者等于datalen * @param Key :密钥(可为8位,16位,24位)支持3密钥 * @param keylen : 密钥长度，多出24位部分将被自动裁减 * @return true--成功；false--失败； */static bool RunDes(bool bType,bool bMode,const unsigned char* In, unsigned char* Out,unsigned datalen,const unsigned char* Key,unsigned keylen);protected://计算并填充子密钥到SubKey数据中static void SetSubKey(PSubKey pSubKey, const unsigned char Key[8]);//DES单元运算static void DES(unsigned char Out[8], const unsigned char In[8], const PSubKey pSubKey, bool Type);};#endif//CDES_H_CAESAR__DEF

实现代码如下：// DES.cpp: implementation of the CDES class.////////////////////////////////////////////////////////////////////////#include "DES.h"#include "memory.h"#include <iostream>using namespace std; ////////////////////////////////////////////////////////////////////////// initial permutation IPconst 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};// final permutation IP^-1 const 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};// expansion operation matrixconst 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};// 32-bit permutation function P used on the output of the S-boxes const 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};// permuted choice table (key) const 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 (table) const 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 char LOOP_Table[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};// The (in)famous S-boxes const 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};CDES::CDES(){}CDES::~CDES(){}/*******************************************************************//* 函数名称:ByteToBit 功能描述：把BYTE转化为Bit流参数说明：Out:输出的Bit流[in][out]In:输入的BYTE流[in]bits:Bit流的长度[in] 返回值说明：void 作者:邹德强更新日期：2003.12.19/*******************************************************************/static void ByteToBit(bool *Out, const unsigned char *In, int bits){ for(int i=0; i<bits; ++i) Out[i] = (In[i>>3]>>(7 - i&7)) & 1;}/*******************************************************************//* 函数名称:BitToByte 功能描述：把Bit转化为Byte流参数说明：Out:输出的BYTE流[in][out]In:输入的Bit流[in]bits:Bit流的长度[in] 返回值说明：void 作者:邹德强更新日期：2003.12.19/*******************************************************************/static void BitToByte(unsigned char *Out, const bool *In, int bits){ memset(Out, 0, bits>>3); for(int i=0; i<bits; ++i) Out[i>>3] |= In[i]<<(7 - i&7);}/*******************************************************************//* 函数名称:RotateL 功能描述：把BIT流按位向左迭代参数说明：In:输入的Bit流[in]len:Bit流的长度[in]loop:向左迭代的长度返回值说明：void 作者:邹德强更新日期：2003.12.19/*******************************************************************/static void RotateL(bool *In, int len, int loop){bool Tmp[256]; memcpy(Tmp, In, loop); memcpy(In, In+loop, len-loop); memcpy(In+len-loop, Tmp, loop);}/*******************************************************************//* 函数名称:Xor 功能描述：把两个Bit流进行异或参数说明：InA:输入的Bit流[in][out]InB:输入的Bit流[in]loop:Bit流的长度返回值说明：void 作者:邹德强更新日期：2003.12.19/*******************************************************************/static void Xor(bool *InA, const bool *InB, int len){ for(int i=0; i<len; ++i) InA[i] ^= InB[i];}/*******************************************************************//* 函数名称:Transform 功能描述：把两个Bit流按表进行位转化参数说明：Out:输出的Bit流[out]In:输入的Bit流[in]Table:转化需要的表指针len:转化表的长度返回值说明：void 作者:邹德强更新日期：2003.12.19/*******************************************************************/static void Transform(bool *Out, bool *In, const char *Table, int len){bool Tmp[256]; for(int i=0; i<len; ++i) Tmp[i] = In[ Table[i]-1 ]; memcpy(Out, Tmp, len);}/*******************************************************************//* 函数名称:S_func 功能描述：实现数据加密S BOX模块参数说明：Out:输出的32Bit[out]In:输入的48Bit[in] 返回值说明：void 作者:邹德强更新日期：2003.12.19/*******************************************************************/static void S_func(bool Out[32], const bool In[48]){ for(char i=0,j,k; i<8; ++i,In+=6,Out+=4) { j = (In[0]<<1) + In[5]; k = (In[1]<<3) + (In[2]<<2) + (In[3]<<1) + In[4];//组织SID下标for(int l=0; l<4; ++l)//把相应4bit赋值Out[l] = (S_Box[i][j][k]>>(3 - l)) & 1; }}/*******************************************************************//* 函数名称:F_func 功能描述：实现数据加密到输出P 参数说明：Out:输出的32Bit[out]In:输入的48Bit[in] 返回值说明：void 作者:邹德强更新日期：2003.12.19/*******************************************************************/static void F_func(bool In[32], const bool Ki[48]){ bool MR[48]; Transform(MR, In, E_Table, 48); Xor(MR, Ki, 48); S_func(In, MR); Transform(In, In, P_Table, 32);}bool CDES::RunDes(bool bType,bool bMode,const unsigned char* In, unsigned char* Out,unsigned datalen,const unsigned char* Key,unsigned keylen){//判断输入合法性if(!(In && Out && Key && datalen && keylen>=8))return false; unsigned char inbuf[datalen + 8]; memset(inbuf, 0x00, sizeof(inbuf)); memcpy(inbuf, In, datalen); unsigned char* tempBuf; unsigned padlen = datalen; //只处理8的整数倍，不足长度自己填充if(datalen & 0x00000007){ if (!RunPad(PAD_PKCS_7, In, datalen, inbuf, padlen)) return false; tempBuf = inbuf; } else { tempBuf = inbuf; }boolm_SubKey[3][16][48];//秘钥//构造并生成SubKeysunsigned char nKey=(keylen>>3)>=3 ? 3: (keylen>>3);for(int i=0;i<nKey;i++){SetSubKey(&m_SubKey[i],&Key[i<<3]);}if(bMode == ECB)//ECB模式{if(nKey==1)//单Key{ int j = padlen>>3; for(int i=0,j = padlen>>3;i<j;++i,Out+=8,tempBuf+=8){DES(Out,tempBuf,&m_SubKey[0],bType);}}elseif(nKey == 2)//3DES 2Key{for(int i=0,j = padlen>>3;i<j;++i,Out+=8,tempBuf+=8){DES(Out,tempBuf,&m_SubKey[0],bType);DES(Out,Out,&m_SubKey[1],!bType);DES(Out,Out,&m_SubKey[0],bType);}}else//3DES 3Key{for(int i=0,j=padlen>>3;i<j;++i,Out+=8,tempBuf+=8){DES(Out,tempBuf,&m_SubKey[bType? 2 : 0],bType);DES(Out,Out,&m_SubKey[1],!bType);DES(Out,Out,&m_SubKey[bType? 0 : 2],bType);}}}else//CBC模式{unsigned charcvec[8]="";//扭转向量unsigned charcvin[8]=""; //中间变量if(nKey == 1)//单Key{for(int i=0,j=padlen>>3;i<j;++i,Out+=8,tempBuf+=8){if(bType==CDES::ENCRYPT){for(int j=0;j<8;++j)//将输入与扭转变量异或{cvin[j]=tempBuf[j] ^ cvec[j];}}else{memcpy(cvin,tempBuf,8);}DES(Out,cvin,&m_SubKey[0],bType);if(bType==CDES::ENCRYPT){memcpy(cvec,Out,8);//将输出设定为扭转变量}else{for(int j=0;j<8;++j)//将输出与扭转变量异或{Out[j]=Out[j] ^ cvec[j];}memcpy(cvec,cvin,8);//将输入设定为扭转变量}}}elseif(nKey == 2)//3DES CBC 2Key{for(int i=0,j=padlen>>3;i<j;++i,Out+=8,tempBuf+=8){if(bType==CDES::ENCRYPT){for(int j=0;j<8;++j)//将输入与扭转变量异或{cvin[j]=tempBuf[j] ^ cvec[j];}}else{memcpy(cvin,tempBuf,8);}DES(Out,cvin,&m_SubKey[0],bType);DES(Out,Out,&m_SubKey[1],!bType);DES(Out,Out,&m_SubKey[0],bType);if(bType==CDES::ENCRYPT){memcpy(cvec,Out,8);//将输出设定为扭转变量}else{for(int j=0;j<8;++j)//将输出与扭转变量异或{Out[j]=Out[j] ^ cvec[j];}memcpy(cvec,cvin,8);//将输入设定为扭转变量}}}else//3DES CBC 3Key{for(int i=0,j=padlen >>3;i<j;++i,Out+=8,tempBuf+=8){if(bType==CDES::ENCRYPT){for(int j=0;j<8;++j)//将输入与扭转变量异或{cvin[j]=tempBuf[j] ^ cvec[j];}}else{memcpy(cvin,tempBuf,8);}DES(Out,cvin,&m_SubKey[bType ? 2 : 0],bType);DES(Out,Out,&m_SubKey[1],!bType);DES(Out,Out,&m_SubKey[bType ? 0 : 2],bType);if(bType==CDES::ENCRYPT){memcpy(cvec,Out,8);//将输出设定为扭转变量}else{for(int j=0;j<8;++j)//将输出与扭转变量异或{Out[j]=Out[j] ^ cvec[j];}memcpy(cvec,cvin,8);//将输入设定为扭转变量}}}}return true;}/*******************************************************************//* 函数名称:RunPad 功能描述：根据协议对加密前的数据进行填充参数说明：bType:类型：PAD类型In:数据串指针Out:填充输出串指针datalen:数据的长度padlen:(in,out)输出buffer的长度，填充后的长度返回值说明：bool:是否填充成功作者:邹德强修改历史：更新日期：2003.12.19/*******************************************************************/boolCDES::RunPad(int nType, const unsigned char* In, unsigned datalen, unsigned char* Out, unsigned& padlen){ if (nType < PAD_ISO_1 || nType > PAD_PKCS_7) return false; if (In == NULL || datalen < 0 || Out == NULL) return false;int res = (datalen & 0x00000007);if (res == 0) { padlen = datalen; memcpy(Out, In, datalen); return true; } padlen=(datalen+8-res); memcpy(Out,In,datalen);if(nType==PAD_ISO_1){memset(Out+datalen,0x00,8-res);}elseif(nType==PAD_ISO_2){memset(Out+datalen,0x80,1);memset(Out+datalen,0x00,7-res);}elseif(nType==PAD_PKCS_7){memset(Out+datalen,0x00,8-res);}else{return false;}return true;}//计算并填充子密钥到SubKey数据中void CDES::SetSubKey(PSubKey pSubKey, const unsigned char Key[8]){bool K[64], *KL=&K[0], *KR=&K[28]; ByteToBit(K, Key, 64); Transform(K, K, PC1_Table, 56); for(int i=0; i<16; ++i) { RotateL(KL, 28, LOOP_Table[i]); RotateL(KR, 28, LOOP_Table[i]); Transform((*pSubKey)[i], K, PC2_Table, 48); }}//DES单元运算void CDES::DES(unsigned char Out[8], const unsigned char In[8], const PSubKey pSubKey, bool Type){ bool M[64], tmp[32], *Li=&M[0], *Ri=&M[32]; ByteToBit(M, In, 64); Transform(M, M, IP_Table, 64); if( Type == ENCRYPT ){ for(int i=0; i<16; ++i){ memcpy(tmp, Ri, 32);//Ri[i-1] 保存 F_func(Ri, (*pSubKey)[i]);//Ri[i-1]经过转化和SBox输出为P Xor(Ri, Li, 32);//Ri[i] = P XOR Li[i-1] memcpy(Li, tmp, 32);//Li[i] = Ri[i-1] } }else{ for(int i=15; i>=0; --i) {memcpy(tmp, Ri, 32);//Ri[i-1] 保存 F_func(Ri, (*pSubKey)[i]);//Ri[i-1]经过转化和SBox输出为P Xor(Ri, Li, 32);//Ri[i] = P XOR Li[i-1] memcpy(Li, tmp, 32);//Li[i] = Ri[i-1] }}RotateL(M,64,32);//Ri与Li换位重组M Transform(M, M, IPR_Table, 64);//最后结果进行转化 BitToByte(Out, M, 64);//组织成字符}