HTTPS和RSA结合的数据安全传递

一 . 客户端和服务器必须进行安全的HTTPS数据传递

    服务器端： 要到固定的CA证书机构去生成根证书，存放在服务器和客户端

    客户端：除了存放根证书外，还要进行使用NSURLConnection 和NSURLSession 相应的HTTPS请求设置

二.iOS 中代码基于HTTPS的安全请求

 1. NSURLConnection 的HTTPS请求

  start request  

{

        _urlConnection = [[NSURLConnectionalloc] initWithRequest:_requestdelegate:self];

        

        [_urlConnectionstart];

}

#pragma mark - NURLConnection delegate

// We use this method is to accept an untrusted site which unfortunately we need to do, as our PVM servers are self signed.

- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace

{

    DLog(@"%s",__func__);

    return [protectionSpace.authenticationMethodisEqualToString:NSURLAuthenticationMethodServerTrust];

}

 

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge;

{

    NSLog(@"WebController Got auth challange via NSURLConnection");

     DLog(@"%s",__func__);

    if ([challengepreviousFailureCount] ==0)

    {

        _authenticated =YES;

        

        NSURLCredential *credential = [NSURLCredentialcredentialForTrust:challenge.protectionSpace.serverTrust];

        

        [challenge.senderuseCredential:credentialforAuthenticationChallenge:challenge];

        

    } else

    {

        [[challenge sender]cancelAuthenticationChallenge:challenge];

    }

}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;

{

    NSLog(@"WebController received response via NSURLConnection");

    NSHTTPURLResponse *repose= (NSHTTPURLResponse *)response;

    if(repose.statusCode !=200)

    {

        [NetworkErrorViewshowNetworkErrorViewInView:self.viewerrorStr:@"网络出错啦"SelectBlock:^{

            [selfstartRequestUrl];

        }];

        return;

    }

    if([self.webView.request.URL.absoluteStringcontainsString:@"https://qiangui.58.com/changewbid"])

    {

        return;

    }

    DLog(@"%s",__func__);

    // remake a webview call now that authentication has passed ok.

    _authenticated =YES;

    [_webViewloadRequest:_request];

    

    // Cancel the URL connection otherwise we double up (webview + url connection, same url = no good!)

    [_urlConnectioncancel];

}

 2. NSURLSession 的HTTPS的请求

- (void)startRequestWithUrl:(NSString *)url

{

    NSURL *URL = [NSURLURLWithString:url];

    NSURLSessionDownloadTask *task = [self.sessiondownloadTaskWithURL:URL];

    [task resume];

    

}

//    NSURLSessionAuthChallengeUseCredential = 0, 使用（信任）证书

//    NSURLSessionAuthChallengePerformDefaultHandling = 1, 默认，忽略

//    NSURLSessionAuthChallengeCancelAuthenticationChallenge = 2,  取消

//    NSURLSessionAuthChallengeRejectProtectionSpace = 3,      这次取消，下载次还来问

// 工作中直接复制这一段代理Ok了

// 金融公司

//   https 第一段认证过程

- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition,NSURLCredential * _Nullable))completionHandler{

    NSLog(@"%s",__func__);

    NSURLSessionAuthChallengeDisposition disposition =NSURLSessionAuthChallengePerformDefaultHandling;

    __blockNSURLCredential *credential =nil;

    

    if ([challenge.protectionSpace.authenticationMethodisEqualToString:NSURLAuthenticationMethodServerTrust]) {

        credential = [NSURLCredentialcredentialForTrust:challenge.protectionSpace.serverTrust];

        if (credential) {

            disposition = NSURLSessionAuthChallengeUseCredential;

        } else {

            disposition = NSURLSessionAuthChallengePerformDefaultHandling;

        }

    } else {

        disposition = NSURLSessionAuthChallengePerformDefaultHandling;

    }

    

    if (completionHandler) {

        completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, credential);

    }

}

//  https 第二段认证过程

//- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge

// completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential * __nullable credential))completionHandler {

//    NSLog(@"%@",challenge.protectionSpace);

//    // 如果是请求证书信任，我们再来处理，其他的不需要处理

//    if (challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust) {

//        NSURLCredential *cre = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];

//        // 调用block

//        completionHandler(NSURLSessionAuthChallengeUseCredential,cre);

//    }

//

//

//}

- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {

    NSLog(@"%s",__func__);

    NSLog(@"%@",[[NSStringalloc]initWithData:dataencoding:NSUTF8StringEncoding]);

}

- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask

      didWriteData:(int64_t)bytesWritten

 totalBytesWritten:(int64_t)totalBytesWritten

totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite {

    NSLog(@"%s",__func__);

    float percent = (float)totalBytesWritten/totalBytesExpectedToWrite;

    NSLog(@"%f",percent);

}

- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask

didFinishDownloadingToURL:(NSURL *)location {

    NSLog(@"%s",__func__);

    // 下载完成之后，把相应的文件从临时文件拷贝到Caches目录中，因为临时目录的文件会在程序杀死时被杀死

        NSString *dirPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES) firstObject];

        NSString *path = [dirPathstringByAppendingPathComponent:@"1.mp3"];

    

        NSFileManager *manager = [NSFileManagerdefaultManager];

        if ([managerfileExistsAtPath:path isDirectory:NO]) {

            [manager removeItemAtPath:patherror:nil];

        }

    

        [manager moveItemAtPath:[locationpath] toPath:patherror:nil];

}

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task

didCompleteWithError:(NSError *)error {

    NSLog(@"%s:%lu",__func__,error.code);

}

三.使用MD5和RSA进行公钥私钥的加密请求过程

   如果在传输的过程中，不管是私钥串还是原文件被修改，在客户端比对时，都会失败，从而提高数据传输的安全性