1.cpp

客户端与服务器的加密验证,用vc开发,只是一个例子,只作参考.

#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <errno.h>
#include <sys/types.h>
#include <winsock.h>

#include <openssl/rsa.h>       /* SSLeay stuff */
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/bio.h>
#pragma comment ( lib, "ssleay32.lib" )
#pragma comment ( lib, "libeay32.lib" )
#pragma comment ( lib, "RSAglue.lib" )
#pragma comment ( lib, "WSOCK32.lib" )

#define CERTF   "..\\chcert.pem"
#define KEYF    "..\\chkey.pem"

#define CHK_NULL(x) if ((x)==NULL) exit (1)
#define CHK_ERR(err,s) if ((err)==-1) { perror(s); exit(1); }
#define CHK_SSL(err) if ((err)==-1) { ERR_print_errors_fp(stderr); exit(2); }

void main ()
{
  int err;
  int listen_sd;
  int sd;
  size_t client_len;      /*size_t的长度和int型的在一般情况下是一样的*/
  SSL_CTX* ctx;           /* ssl类型的BIO */
  SSL*     ssl;           
  X509*    client_cert;
  char*    str;
  char     buf [4096];
  SSL_METHOD *meth;
  WSADATA wsaData;
  struct sockaddr_in sa_serv;
  struct sockaddr_in sa_cli;
 if(::WSAStartup(0x202,&wsaData)!=0)
	{
		
		WSACleanup();    //*也需要一个对WSACleanup()的调用来释放为任务分配的所有资源。

		exit(0);
	};

  SSL_load_error_strings();
  SSLeay_add_ssl_algorithms();
  meth = SSLv23_server_method();//*创建本次会话连接所使用的协议，如果是客户端可以使用 

  ctx = SSL_CTX_new (meth);
  if (!ctx) {
    printf("创建SSL_CTX失败!\n");
    exit(2);
  }
  
  if (SSL_CTX_use_certificate_file(ctx, CERTF, SSL_FILETYPE_PEM) <= 0) {
    printf("加载证书失败!\n");
    exit(3);
  }
  if (SSL_CTX_use_PrivateKey_file(ctx, KEYF, SSL_FILETYPE_PEM) <= 0) {
    printf("加载私钥失败!\n");
    exit(4);
  }

  if (!SSL_CTX_check_private_key(ctx)) {
    printf("密钥证书不匹配！\n");
    exit(5);
  }

  /* Prepare TCP socket for receiving connections */

  listen_sd = socket (AF_INET, SOCK_STREAM, 0);   
  CHK_ERR(listen_sd, "socket");
  
  memset (&sa_serv, '\0', sizeof(sa_serv));
  sa_serv.sin_family      = AF_INET;
  sa_serv.sin_addr.s_addr = INADDR_ANY;
  sa_serv.sin_port        = htons (1111);          /* Server Port number */
  
  err = bind(listen_sd, (struct sockaddr*) &sa_serv, sizeof (sa_serv));                   
  CHK_ERR(err, "bind");
	     
  /* Receive a TCP connection. */
	     
  err = listen (listen_sd, 5);                    
  CHK_ERR(err, "listen");
  
  client_len = sizeof(sa_cli);
  sd = accept (listen_sd, (struct sockaddr*) &sa_cli, (int*)&client_len);
  CHK_ERR(sd, "accept");
  closesocket (listen_sd);

  printf ("Connection from %lx, port %x\n",
	  sa_cli.sin_addr.s_addr, sa_cli.sin_port);
  
  /* ----------------------------------------------- */
  /* TCP connection is ready. Do server side SSL. */

  ssl = SSL_new (ctx);                           CHK_NULL(ssl);
  SSL_set_fd (ssl, sd);
  err = SSL_accept (ssl);                        CHK_SSL(err);
  
  /* Get the cipher - opt */
  
  printf ("SSL connection using %s\n", SSL_get_cipher (ssl));
  
  /* Get client's certificate (note: beware of dynamic allocation) - opt */

  client_cert = SSL_get_peer_certificate (ssl);
  if (client_cert != NULL) {
    printf ("Client certificate:\n");
    
    str = X509_NAME_oneline (X509_get_subject_name (client_cert), 0, 0);
    CHK_NULL(str);
    printf ("\t subject: %s\n", str);
    OPENSSL_free (str);
    
    str = X509_NAME_oneline (X509_get_issuer_name  (client_cert), 0, 0);
    CHK_NULL(str);
    printf ("\t issuer: %s\n", str);
    OPENSSL_free (str);
    
    /* We could do all sorts of certificate verification stuff here before
       deallocating the certificate. */
    
    X509_free (client_cert);
  } else
    printf ("Client does not have certificate.\n");

  /* DATA EXCHANGE - Receive message and send reply. */

  err = SSL_read (ssl, buf, sizeof(buf) - 1);                   CHK_SSL(err);
  buf[err] = '\0';
  printf ("Got %d chars:'%s'\n", err, buf);
  
  err = SSL_write (ssl, "I hear you.", strlen("I hear you."));  CHK_SSL(err);

  /* Clean up. */

  closesocket (sd);
  SSL_free (ssl);
  SSL_CTX_free (ctx);
}
/* EOF - serv.cpp */