socket+dh+cr4实现文件传输加密要点

1、socket+dh+cr4实现文件传输加密client.cpp/ client.cpp : defines the entry point for the console application. /#include #include #include#include/你用了 winsock但没有链接相应的lib文件。加上这一句： #pragma comment(lib, ws2_32.lib )#define fname 30void initial(char *);初始化的函数void crypt();unsigned int s256;/ s 数组void nego(int *a) ;/

2、初始化的函数int run(int x,int r,int p,int t) int a,b,c;a=x;b=r;c=t;if(b=0)return c;if(b0)&(b%2=0)b=b a=(a*a)%p; elseb=b-1;c=(a*c)%p;run(a,b,p,c);void swap(char *s1,char *s2)char temp;temp=*s1;*s1=*s2;*s2=temp;void re_s(char *s).int i;for(i=0;i256;i+)si=i；void re_t(char *t,char *key).int i;int keylen;keyle

3、n=strlen(key);for(i=0;i256;i+)ti=keyi%keylen;void re_sbox(char *s,char *t) .int i;int j=0;for(i=0;i256;i+)j=(j+si+ti)%256;swap(&si,&sj);void rc4_1(file *readfile,file *writefile,char *key)/ 力口密 .char s256=0;char readbuf1;int i,j,t;char t256=0;re_s(s);re_t(t,key);re_sbox(s,t);i=j=0;while(fread(readbu

4、f,1,1,readfile)i = (i + 1) % 256;j = (j + si) % 256;swap(&si,&sj);t = (si + (sj % 256) % 256;readbuf0=readbuf0ast;fwrite(readbuf,1,1,writefile); memset(readbuf,0,1); int main(int argc, char* argv口)printf(-客户端：启动-n)；int x=0;printf(-说明：由客户端定义大素数和原根，客户端加密文件后发给服务器 端，服务器短解密得到正确的消息-n);printf(n);printf(发送大

5、素数和原根给服务器端n);nego(&x);char key=;file *file1,*file2;char filepath150;printf(n);printf(-开始文件传输-n);printf(请输入要发送的文件路径：”)；scanf(%s,filepath1);printf(准备加密文件，请输入共享密钥:);scanf(%s”,&key);file1= fopen(filepath1,r);file2 = fopen(1.txt,w);rc4_1(file1,file2,key);fclose(filel);fclose(file2);printf(加密成功，准备发送给服务器端)

6、;wsadata wsa;wsastartup(makeword(2,2),&wsa);socket sock=socket(af_inet,sock_stream,0); if(sock=invalid_socket)printf(socket errorn);return 0;sockaddr_in local;char server20;/printf(请输入 ip 地址:)；scanf(%s,server);memcpy(server,,sizeof();char filepath50;strcpy(filepath, 1.txt);handlefp

7、=createfile(filepath,generic_read,0,null,open_existing ,file_attri bute_normal,null);while(fp=invalid_handle_v alue) printf(文件路径错误，请重新输入：”)；scanf(%s,filepath);fp=createfile(filepath,generic_read,0,null,open_existing ,file_attri bute_normal,null);printf(%sn,filepath);dword filelen=getfilesize(fp,&fil

8、elen);printf(你选择的文件大小为： %u字节n,filelen);local.sin_addr.s_un.s_addr=inet_addr(server);local.sin_family=af_inet;local.sin_port=htons(10000);if(connect(sock,(sockaddr*)&local,sizeof(sockaddr)=socket_error)printf(connect error:%in,wsagetlasterror(); return 0;char* buffer=new charfilelen;dword bufferlen=0

9、;/读取文件到缓存中readfile(fp,buffer,filelen,&bufferlen,null);bool isfirst=true;/第一次发送int sendlen=0;/实际发送数据的长度char sendbuffer200;/发送帧int sendedlen=0;/s前已发送的文件长度int leftlen=filelen;/当前剩下的文件长度while(true)if(isfirst)sendlen=send(sock,1,0);isfirst=false;if(sendlen0) printf(第一帧发送失败，程序结束n);return 0;sleep(1000);con

10、tinue;if(leftlen=filelen)/剩下长度为 0 或当前已发送长度 为文件长则退出break;if(leftlen=200)memcpy(sendbuffer,buffer+sendedlen,200);sendlen=send(sock,sendbuffer,200,0);if(sendlen0)printf(帧发送失败，程序结束n);return 0;elsememcpy(sendbuffer,buffer+sendedlen,leftlen); sendlen=send(sock,sendbuffer,leftlen,0);if(sendlen0)printf(帧发送失

11、败，程序结束n);return 0;sleep(1000);send(sock,#,1,0);sendedlen+=sendlen;leftlen=filelen-sendedlen;printf(已经发送：%d 字节n,sendedlen);if(sendedlen=filelen)printf(文件发送成功n); elseprintf(文件发送失败n);closesocket(sock);wsacleanup();delete口 buffer;return 0;void nego(int *a)int t=1;int q;int a;int xa1=0;long int xa2=1;int

12、 xb1=0;long int k=1;int *k1;word wversionrequested;wsadata wsadata;int err;socket sockclient;sockaddr_in addrsrv;char recvbuf50;wversionrequested = makeword( 1,1);err = wsastartup( wversionrequested, &wsadata );if ( err != 0 ) printf(something error!);if ( lobyte( wsadata.wversion ) != 1 |hibyte( ws

13、adata.wversion ) != 1 ) wsacleanup();sockclient=socket(af_inet,sock_stream,0);addrsrv.sin_addr.s_un.s_addr=inet_addr();addrsrv.sin_family=af_inet;addrsrv.sin_port=htons(2120);connect(sockclient,(sockaddr*)&addrsrv,sizeof(sockaddr);printf(请输入协商的素数:);char su10;gets(su);send(sockclient,su,strl

14、en(su)+1,0);q=atoi(su);printf(请输入协商的原根:);gets(su);send(sockclient,su,strlen(su)+1,0);a=atoi(su);printf(n);printf(-输入自己的私钥并计算出公钥发给服务器端-n);printf(请输入自己的私钥:);scanf(%d,&xa1);xa2=run(a,xa1,q,t);printf(发送自己的公钥 d给服务器端n”,xa2);sprintf(su,%d,xa2);send(sockclient,su,strlen(su)+1,0);printf(n);printf(-等待服务器端的公钥-

15、n);recv(sockclient,recvbuf,50,0);*a = atoi(recvbuf);printf(得到服务器端公钥：%dn,*a);k=run(*a,xa1,q,t);printf(n);printf(-计算共享的秘密密钥-n);printf(共享的秘密密钥key为肝卜)；closesocket(sockclient);wsacleanup();server.cpp/ server.cpp : defines the entry point for the console application./#include #include #include #include #i

16、nclude #pragma comment(lib, ws2_32.lib )void nego(int *a,int *b,int *c) ;/初始化的函数void swap(char *s1,char *s2)char temp;temp=*s1;*s1=*s2;*s2=temp;void re_s(char *s)int i;for(i=0;i256;i+)si=i；void re_t(char *t,char *key).int i;int keylen;keylen=strlen(key);for(i=0;i256;i+)ti=keyi%keylen;void re_sbox(ch

17、ar *s,char *t)int i;int j=0;for(i=0;i0)&(b%2=0)b=ba=(a*a)%p; elseb=b-1;c=(a*c)%p; run(a,b,p,c); int main(int argc, char* argv口)printf(服务器端：启动n);int x=0,y=0,z=0;printf(-说明：由客户端定义大素数和原根，客户端加密文件后发给服务器 端，服务器短解密得到正确的消息-n);printf(n);printf(-等待客户端客户端定义大素数和原根-n);nego(&x,&y,&z);wsadata wsa;wsastartup(makewor

18、d(2,2),&wsa);socket sock=socket(af_inet,sock_stream,0);if(sock=invalid_socket)printf(socket errorn); return 0;sockaddr_in local;local.sin_addr.s_un.s_addr=inaddr_any;local.sin_family=af_inet;local.sin_port=htons(10000);if(bind(sock,(sockaddr*)&local,sizeof(sockaddr)=socket_error) printf(%in,wsagetla

19、sterror();return 0;if(listen(sock,5)=socket_error) printf(%in,wsagetlasterror();return 0;printf(n);printf(-等待客户端传输文件-n);sockaddr_in client;socket clientsock;int addrlen=sizeof(sockaddr);clientsock=accept(sock,(sockaddr*)&client,&addrlen); printf(welcome:%sn”,inet_ntoa(client.sin_addr);int recvlen=0;

20、/收至ij的缓冲的长度int recvedlen=0;/当前已经收到的长度dword writelen;/实际写入文件的长度int filelen=0;/文件长度char* buffer;/文件缓冲char recvbuffer200;/ 接收缓冲区buffer=new char1024*1024*10;/接收字节数 =10mrecvlen=recv(clientsock,recvbuffer,200,0);if(recvbuffer0=)printf(开始接收文件n);memset(recvbuffer,0,200); while(true)recvlen=recv(clientsock,r

21、ecvbuffer,200,0);if(recvlen=1)&(recvbuffer0=#)break;memcpy(buffer+recvedlen,recvbuffer,recvlen);recvedlen+=recvlen;printf(接收：dn,recvlen);printf(已经接收 %i 字节数据 n,recvedlen);handlefp=createfile(1.txt,generic_write,0,null,open_always,file_attrib ute_normal,null);writefile(fp,buffer,recvedlen,&writelen,nu

22、ll);printf(写入文件长度：un,writelen);closehandle(fp);delete口 buffer;wsacleanup();char key=;printf(准备解密文件：请输入共享密钥：”)；scanf(%s”,&key);file *file1,*file2;file1= fopen(1.txt,r);file2 = fopen(2.txt,w);rc4_1(file1,file2,key);fclose(file1);fclose(file2);printf(解密成功，保存在server文件夹2.txt中)void nego(int *a,int *b,int

23、*c)int t=1;int q;int a;int xa1=0;long int xa2=1;int xb1=0;long int k=1;word wversionrequested;wsadata wsadata;int err;socket socksrv;sockaddr_in addrsrv;int len;sockaddr_in addrclient;char recvbuf50;wversionrequested = makeword( 1,1);err = wsastartup( wversionrequested, &wsadata );if ( err != 0 ) pr

24、intf(something error!);if ( lobyte( wsadata.wversion ) != 1 |hibyte( wsadata.wversion ) != 1 ) wsacleanup();socksrv=socket(af_inet,sock_stream,0);addrsrv.sin_addr.s_un.s_addr=htonl(inaddr_any);addrsrv.sin_family=af_inet;addrsrv.sin_port=htons(2120);bind(socksrv,(sockaddr*)&addrsrv,sizeof(sockaddr);l

25、isten(socksrv,5);len=sizeof(sockaddr);while(1)socket sockconn=accept(socksrv,(sockaddr*)&addrclient,&len); char su10;recv(sockconn,recvbuf,50,0);*a = atoi(recvbuf);printf(客户端定义的大素数：dn,*a);recv(sockconn,recvbuf,50,0);*b = atoi(recvbuf);printf(客户端定义的原根：dn,*b);printf(n);printf(-等待客户端的公钥-n);recv(sockconn,recvb