iOS请求参数按key排序再MD5加密

+ (NSString*)md5Codesign:(NSDictionary*)dict{

    NSArray*allKeyArray = [dictallKeys];

    NSArray*afterSortKeyArray = [allKeyArray sortedArrayUsingComparator:^NSComparisonResult(id  _Nonnullobj1,id  _Nonnullobj2) {

        NSComparisonResultresuest = [obj1compare:obj2];

        return resuest;

    }];

    //NSLog(@"afterSortKeyArray:%@",afterSortKeyArray);

    //通过排列的key值获取value

    NSMutableArray *valueArray = [NSMutableArray array];

    for(NSString*sortsing in afterSortKeyArray) {

        NSString*valueString = [dictobjectForKey:sortsing];

        [valueArray addObject:valueString];

    }

    NSMutableString *signString = [NSMutableString string];

    for(inti =0; i < afterSortKeyArray.count; i++) {

        NSString*keyValue = [NSString stringWithFormat:@"%@",valueArray[i]];

        [signString appendString:keyValue];

    }

    //signString用于签名的原始参数集合

//    MYLog(@"%@",signString);

//    MYLog(@"%@",[signString md5Str]);

    return [signString md5Str];

}

-(NSString*)md5Str

{

    const char* myPasswordd = [selfUTF8String];

    unsigned char md5c[16];

    CC_MD5(myPasswordd, (CC_LONG)strlen(myPasswordd), md5c);

    NSMutableString *md5Str = [NSMutableString string];

    for(inti =0; i<16; i++) {

        [md5Str appendFormat:@"%02x",md5c[i]];

    }

    return md5Str;

}