C++ DES 加密（Cryptopp ）

转载注明出处

http://blog.csdn.net/xugangjava

写了一个DES加密的插件，用的是crypto++库，各种字符的转换有点晕

插件是ATL的Activex 只贴出关键代码，希望对你有用，如有不足欢迎指出。

//加密代码

STDMETHODIMP CMAddr::En(BSTR instr, BSTR* outstr){CComBSTR com_instr(instr);if(com_instr.Length()==0){com_instr.Empty();return S_OK;}int pos=0;const int bsize=DES::BLOCKSIZE;char* ptr_instr=NULL;CString cstr_result;CString cstr_buffer;DESEncryption encryption_DES;unsigned char key[ DES::KEYLENGTH ] = "xugangf";byte blockin[bsize];byte blockout[bsize];        //设置密钥encryption_DES.SetKey(key, DES::KEYLENGTH);int nwLen=0;        //将宽字节字符集转成多字节，crypto 没unicode的版本让我比较蛋疼nwLen=WideCharToMultiByte(CP_ACP,NULL,com_instr.m_str,-1,NULL,0,NULL,FALSE);ptr_instr=new char[nwLen+bsize+1];if(!ptr_instr){delete[] ptr_instr;return FALSE;}WideCharToMultiByte(CP_ACP,NULL,com_instr.m_str,-1,ptr_instr,nwLen,NULL,FALSE);while(pos<nwLen){ZeroMemory(blockin,bsize);ZeroMemory(blockout,bsize);memcpy_s(blockin,bsize,ptr_instr+pos,bsize);                //解密数据块encryption_DES.ProcessBlock(blockin, blockout);//转换成16进制数字输出，不然加密后是乱码而且无法解密，//codepage找不到这个字符就给你个乱码//你用乱码来解密，解出来也是乱码for(int bpos=0;bpos<bsize;bpos++){cstr_buffer.Format(L"%02x",blockout[bpos]);cstr_result.Append(cstr_buffer);}pos+=bsize;}       //免得内存泄露，清理一下com_instr.Empty();delete[] ptr_instr;CComBSTR result;bstr_t  bstr_result(cstr_result.LockBuffer()); result.Append(bstr_result.GetBSTR());result.CopyTo(outstr);cstr_result.UnlockBuffer();result.Empty();cstr_result.Empty();cstr_buffer.Empty();return S_OK;}//解密代码STDMETHODIMP CMAddr::De(BSTR instr, BSTR* outstr){CComBSTR com_instr(instr);if(com_instr.Length()==0){com_instr.Empty();return S_OK;}int pos=0;//char posconst int bsize=DES::BLOCKSIZE;//block sizeint blockpos=0;// block posint charpos=0;//char posDESDecryption decryption_DES;        //设置密钥unsigned char key[ DES::KEYLENGTH ] = "xugangf";decryption_DES.SetKey(key, DES::KEYLENGTH);byte blockin[bsize];byte blockout[bsize];int nwLen=0; //将传进来的16进制代码转多字节，BSTR 进来自动是宽字节的nwLen=WideCharToMultiByte(CP_ACP,NULL,com_instr.m_str,-1,NULL,0,NULL,NULL);char* ptr_instr=new char[nwLen+bsize+1];if(!ptr_instr){delete[] ptr_instr;return FALSE;}WideCharToMultiByte(CP_ACP,NULL,com_instr.m_str,-1,ptr_instr,nwLen,NULL,FALSE);char tempbuf[4];while(charpos<nwLen){ZeroMemory(blockin,bsize);ZeroMemory(blockout,bsize);  //两个字符合成一个16进制的unsigned charfor( blockpos=0;blockpos<DES::BLOCKSIZE;blockpos++,charpos+=2){tempbuf[0]=ptr_instr[charpos];tempbuf[1]=ptr_instr[charpos+1];tempbuf[2]=0;blockin[blockpos]= (unsigned char) strtol(tempbuf, (char**)NULL, 16);}decryption_DES.ProcessBlock(blockin, blockout);  //将解密出的字符串转到ptr_instrmemcpy_s(ptr_instr+pos,bsize,blockout,bsize);pos+=bsize;}        //多字节转宽字节nwLen = MultiByteToWideChar (CP_ACP, 0, ptr_instr, -1, NULL, 0);wchar_t *ptr_winstr = new wchar_t[nwLen+bsize+1];if(!ptr_winstr){delete[] ptr_winstr;return FALSE;}MultiByteToWideChar (CP_ACP, 0,ptr_instr, -1, ptr_winstr , nwLen);com_instr.Empty();delete[] ptr_instr;CComBSTR result(ptr_winstr); //写结果result.CopyTo(outstr);result.Empty();delete[] ptr_winstr;return S_OK;}