rotr | Raft On The RocksDB - Rotr is the C11/14 Raft consensus | Build Tool library
kandi X-RAY | rotr Summary
kandi X-RAY | rotr Summary
rotr is the C++14 Raft consensus protocol implementation using RocksDB as storage solution. Then install protocol buffers from:
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QUESTION
if you look at the temp1 value in iteration 0. You will see that I'm getting 0xb37b0cfa1b96e8a0 while I should be getting 0x1b37b0cfa1b96e8a0. why is the 0x1 not appearing in mine? Is this a datatype-related issue? does it overflow or is my implementation for temp1 wrong?
I hashed "abc" by the way.
to hash a message: SHA512 hash("abc");
Code:
...ANSWER
Answered 2022-Jan-05 at 01:07Your code has two bugs that I've found. The first is in the initial value of G. You provided 0x1f83d9abfb42bd6b, but 0x1f83d9abfb41bd6b is correct (that is 41
, not 42
). Because SHA-512, like all cryptographically secure hash functions, exhibits the avalanche effect, changing the initial constant by even one bit will result in a totally different output. This change probably does not affect the security of the algorithm, but of course it's not SHA-512 and doesn't produce compatible results.
My recommendation in this case is to copy and paste the constants from the PDF or other reputable source, or generate them at the command line using bc
or dc
, since this kind of mistake is easy to make. The constants aren't copyrightable anyway, so copying and pasting a list of them from somewhere doesn't affect the license of your code.
The other, once that's fixed, is that std::hex
doesn't format to two places, so when one of the output bytes ix 0x0a, it just prints "a" instead of "0a". I know there's some way to fix this using the standard formatting streams in C++, but I've virtually abandoned C++ for Rust some time ago, so I'll leave fixing that as an exercise for the reader. You could also just use (gasp!) printf
, where the %02x
format specifier will do what you want.
I discovered the problem by using the outputs in the NIST intermediate values PDF and then comparing constants to see what was different.
QUESTION
I'm running a security scanner against an app I'm developing and it's rising red alert, maximum security thread for the gem rotr which uses in its Gemfile source with HTTP protocol revealing a possibility for man in the middle attack that potentially can allow an attacker to inject any code into an application
The link to Gemfile in question - https://github.com/mdp/rotp/blob/master/Gemfile
It states:
...ANSWER
Answered 2021-Dec-23 at 08:10In your example, the gem would be loaded via HTTPS, because the Gemfile
of a dependency will not be loaded at all. From dependencies, only the gemspec
file is evaluated by Bundler. The gem's Gemfile
is only used during the development of that gem. Interesting read in this context: How bundler priorities sources.
The following for the interested reader why it is important to use HTTPS
when downloading gems:
When you load a gem from a non-HTTPS source and there is a man-in-the-middle attacker then this attacker would be able to send you back anything instead of the gem you requested.
Of course, there are man ifs and whens. But let's imagine you are going to download a gem on a non-secure communication channel like pure HTTP. And let's imagine there is a man-in-the-middle attacker that is able to sniff your traffic. This might be possible when using the same WiFi in a café or hotel, or when there are different customers on virtual servers in a data center or they have physical access to your landline.
Because they can read your unencrypted request for a gem then know what gems you are using. Now imagine that they do not just sniff your traffic but instead manipulate the response from the servers to you too. When you, for example, request a new version of a popular gem to handle user authentication and authorization or payments they could send you back their version instead of the original version.
And their version could include some minor changes like:
- when loaded the gem could upload your Gemfile to the attacker which would give the attacker a great overview of your application.
- when loaded the gem could take all
ENV
variables and/orRails.credentials
and upload them to a server that is controlled by the attacker. This would certainly git the attacker all your application's passwords. - because it changed the original gem dealing with user credentials the malicious gem would be able to track users or your admin credentials when they log in or update their credentials. Given that many users use the same email/password combination everywhere this would be a nightmare.
- if the gem can read
ENV
variables orRails.credentials
then that means that it could change them too. For example, to connect to another payment provider would mean your customer's payment would be redirected into a different account. - And on top of that, the malicious gem could also replace itself with the original gem once it was loaded into memory. What would make it difficult to figure out that your server was attacked.
tl;dr When an attacker is able to do a man-in-the-middle attack then they can send you malicious versions of a gem. These malicious gems could do almost everything with your application you can imagine. Sure, attacks like this are not simple, but they are not super-hard neither.
The rule of thumb is: Always use HTTPS whenever possible (not just for downloading gem but for all network traffic).
QUESTION
I am making a game in pygame where you now swim around and eat small squares, with an animation to the jellyfish. I've made it so you get bigger when eating, but when adding a number between 1-9 to the scale the image sort of gets wider than I want it to become. When I have the scale go up by 10 or more when eating this problem does not occur as badly.
This is the code for the jellyfish/player:
...ANSWER
Answered 2021-Nov-13 at 16:16Pygame behaves weird when using the transformed image repetitively as in case of rotation...
I even have faced crashes due to it
So try using the the same image which is initially loaded as img0,img1,etc. and scale it to the desired size. As of now you were using the same scaled image again and again . This might help
QUESTION
I am using python3.8 and BeautfiulSoup 4 to parse a website. The section I want to read is here:
...ANSWER
Answered 2021-Oct-31 at 09:30get_text method has a parameter to split different elements' text. As an example:
QUESTION
I'm using Clang and GCC trunk with -std=c++20
and the following code compiles fine on Clang but fails on GCC.
ANSWER
Answered 2021-May-26 at 10:26I suspect it to be a GCC bug in the template-argument-deducation resulting from your alias in combination with the vector intrinsics attribute as:
- It compiles if you specify the template argument of
rotr
manually. - A simplified example without concepts in C++17 also compiles on Clang and Intel compiler but yet again fails on GCC. Therefore C++20
concepts
can't be the reason! - It compiles fine if you only exchange the alias with a simple
struct vec
.
So the code itself without template-argument-deduction seems to be perfectly valid just somehow GCC ends up deducting T = __vector(8) unsigned int
which then fails the std::unsigned_integral
concept as is_integral_v
evaluates to false
.
I guess for a better answer that explains you why this might happen you will need a language-lawyer
.
QUESTION
i am kind of newbie at asp.net core and i get a course from udemy. I did everything like instructors did. When i try to add test datas to database i get error that System.InvalidOperationException: 'The instance of entity type 'ProductCategory' cannot be tracked because another instance with the same key value for {'CategoryId', 'ProductId'} is already being tracked. When attaching existing entities, ensure that only one entity instance with a given key value is attached. Consider using 'DbContextOptionsBuilder.EnableSensitiveDataLogging' to see the conflicting key values.'
.
I research a lot about that but i understood nothing because it seemed very complicated to me.
SeedDatabase.cs
...ANSWER
Answered 2021-Jan-30 at 10:03When we change codes that way it works, it throw error because after addrange categories and product, i have to run savechanges() because products and categories have to get id's from database after that we can mark productcategory.
SeedDatabase.cs
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