ios 发送文件和md5加密

#import <CommonCrypto/CommonDigest.h>

-(void) UploadToKingjoyServer{
    //测试地址，在项目中去掉，在stopRecord中传入的
    self.uploadPath = @"http://xxxxx";
    self.playerID = @"100010010002";
    
    NSMutableString *urlString = [[NSMutableString alloc]init ];
    [urlString  appendString: self.uploadPath];
    
    //1.签名
    NSString * key = @"md5key";//md5签名密钥key
    NSString * encryp = [self MD5:[NSString stringWithFormat:@"%@%@" , self.playerID , key]];
    [urlString appendFormat:@"?playerId=%@&flag=%@",self.playerID , encryp ];
    
    //2.构造http请求
    NSString *filename = self.amrFilePath;
    
    NSData *audioData = [NSData dataWithContentsOfFile:filename];
    
    
    NSMutableURLRequest * request= [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];
    
    [request setValue:[NSString stringWithFormat:@"%lu",(unsigned long)[audioData length] ] forHTTPHeaderField:@"Content-Length"];
    
    NSLog(@"length %@" , [NSString stringWithFormat:@"%lu",(unsigned long)[audioData length]]);
    
    [request addValue:@"binary/octet-stream" forHTTPHeaderField: @"Content-Type"];
    [request setHTTPBody:audioData];

    //3.请求，处理回调
    [NSURLConnection sendAsynchronousRequest:request
                                       queue:[NSOperationQueue mainQueue]
                           completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
                               
                               NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;

                               NSLog(@"statusCode %li" , (long)[httpResponse statusCode]);
                               if ([httpResponse statusCode] == 200) {
                                   
                               }
                               
                               NSString* rs = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                               NSLog(@"response %@" , rs);
                           }];
}

//md5签名
- (NSString *)MD5:(NSString* )input {
    
    const char * pointer = input.UTF8String;
    unsigned char md5Buffer[CC_MD5_DIGEST_LENGTH];
    
    CC_MD5(pointer, (CC_LONG)strlen(pointer), md5Buffer);
    
    NSMutableString *string = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
    for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
        [string appendFormat:@"%02x",md5Buffer[i]];
    
    return string;
}