myencrptpublic.cpp

一个用3DES加密文件的小测试程序！

#include "stdafx.h"
#include "MyEncrptPublic.h"
#include "Winsock2.h"
#include "math.h"
#pragma comment(lib, "Ws2_32")
void  EncryptBuffer(char *pbuffer,char *pout,int nStartPos,int nEnlen,int nBufferDataSize,
					 unsigned char *pKey,int nKeyLen)
{
  register int i,j=0;
  register int nDataSize=min(nEnlen,nBufferDataSize-nStartPos);
  char *p=pbuffer+nStartPos;
  if(nDataSize<=0) return;
   for(i=0;i<nDataSize;i++){

       *pout=*p^pKey[j];

	   j++;
	   p++;
	   pout++;
	 if(j>=nKeyLen)
		 j=0; 
	 
  } // end i 

}
void MMCopy(char *pdst,char *psrc,int k)
{

   __asm{

		 //save the registers
	    	 push eax
			 push ebx
	         push ecx
		     push edx

            mov ecx ,k
			mov ebx,pdst
			mov edx,psrc
			mov eax ,0

  copyloop:
			 mov al,[edx]
             mov [ebx],al
			 
			 add ebx,1
			 add edx,1
			 //add eax,1
			 dec ecx
			 
			 jne		copyloop
       

		 //restore the registers
       ExitLine:
		    pop edx
		    pop ecx
			pop ebx
		    pop eax
    	//	ret

	}
//	TRACE("");
}

void  EncryptBuffer_Asm_(char *pbuffer,int nStartPos,int nEnlen,int nBufferDataSize,
					    unsigned char *pKey,int nKeyLen)
{
   int nDataSize=min(nEnlen,nBufferDataSize-nStartPos);
   
  
   __asm{

		 //save the registers
	    	 push eax  
			 push ebx   //data buffer

	         push ecx   // datasize
		     push edx   //keylen

			 push esi  // pkey
   
             //push epi 
           
			mov ecx,nDataSize //缓存计数器
			mov edx,nKeyLen  // 密钥计数器

		 
            mov ebx,pbuffer  
			add ebx,nStartPos  // databuffer
			
			mov esi ,pKey    // key
   
  Encrptyloop:
			 mov al,[ebx]
		//	 mov ah,[esi]
           	 xor al,[esi]

             mov [ebx],al  // 完成数据单元加密


			//inc ebx
			//inc esi
			add ebx,1
			add esi,1
	
			//dec edx
            sub edx,1
			jne  continueNext
			 
			 mov edx ,nKeyLen
             mov esi,pKey 

  continueNext:// dec ecx
			  sub ecx,1
			  jne	Encrptyloop
  
		 //restore the registers
       ExitLine:

    		pop esi
		    pop edx
		    pop ecx
			pop ebx
		    pop eax
    	//	ret

	}
   
//	TRACE("sd");
}
void  EncryptBuffer_Asm(char *pbuffer,char *poutbuffer,
						int nStartPos,int nEnlen,int nBufferDataSize,
					    unsigned char *pKey,int nKeyLen)
{
   int nDataSize=min(nEnlen,nBufferDataSize-nStartPos);
   if(!poutbuffer)
	   poutbuffer=pbuffer;
   __asm{

		 //save the registers
	    	 push eax  
			 push ebx   //data buffer

	         push ecx   // datasize
		     push edx   //keylen

			 push esi  // pkey
             push edi  // Poutbuffer

             //push epi 
           
			mov ecx,nDataSize //缓存计数器
			mov edx,nKeyLen  // 密钥计数器

		 
            mov ebx,pbuffer  
			add ebx,nStartPos  // databuffer
			
			mov esi ,pKey    // key
            mov edi ,poutbuffer // outbuffer

  Encrptyloop:
			 mov al,[ebx]
		//	 mov ah,[esi]
           	 xor al,[esi]

             mov [edi],al  // 完成数据单元加密


			//inc ebx
			//inc esi
			add ebx,1
			add esi,1
			add edi,1
			//dec edx
            sub edx,1
			jne  continueNext
			 
			 mov edx ,nKeyLen
             mov esi,pKey 

  continueNext:// dec ecx
			  sub ecx,1
			  jne	Encrptyloop
  
		 //restore the registers
       ExitLine:

            pop edi 
			pop esi
		    pop edx
		    pop ecx
			pop ebx
		    pop eax
    	//	ret

	}
   
//	TRACE("sd");
}