hexutil | Classes and functions to deal with hexagonal grids
kandi X-RAY | hexutil Summary
kandi X-RAY | hexutil Summary
This module provides the following functionality. All this is provided by the module hexutil. The file example.py contains example coding using this functionality. The above image is a screenshot from this example.
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- Paint the window
- Return the center of a hex color
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- Returns the corners of the rectangle
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- Run n steps
- Run the loop
- Returns a dictionary of field - of - view of this field
- Return the angle of a corner
- Apply field - of - view
- Return the successors of the FOV tree
- Generate a random walk
- Returns a random neighbour
- Rotate the left to the right
- Rotate around the right
hexutil Key Features
hexutil Examples and Code Snippets
Community Discussions
Trending Discussions on hexutil
QUESTION
i ve been trying to learn stuff about smart contracts lately, but when i tried to understand how a token transfer works i ve encountered this problem. || execution reverted: ERC20: transfer from the zero address || (ropsten network)
the code:
...ANSWER
Answered 2021-Nov-05 at 06:02Apparently, the problem was with the gasLimit. I changed the gasLimit to:
QUESTION
I am attempting to generate a personal_sign in Golang like its implemented in ethers.js. Similar question but that ended up using the regular sign over the personal sign_implementation.
Ethers
...ANSWER
Answered 2021-Oct-29 at 14:59There is a bug in the JavaScript code.
From the documentation of signer.signMessage() (see the Note section), it appears that a string is UTF8 encoded and binary data must be passed as TypedArray or Array.
The Keccak hash is returned hex encoded, i.e. as string, and is therefore UTF8 encoded, which is incorrect. Instead, it must be converted to a TypedArray. For this purpose the library provides the function ethers.utils.arrayify().
The following JavaScript is based on the posted code, but performs the required hex decoding:
QUESTION
- Go sha256 orign data then DSA sign it
- print sign result by hex
- use Java SHA256withDSA to verify first step result return false
- i konw sha256 then DSA is difference SHA256withDSA
- how can i do in Go to generate a sign, that can be verified using sha256withdsa in Java ?
- do Go has any another third party library support ?
Go
...ANSWER
Answered 2021-Sep-03 at 05:40i found in java
QUESTION
- Go generates a signature using a DSA private key
- Java verifies first step result using the DSA public key
- Java should return true, but returns false
ANSWER
Answered 2021-Sep-01 at 12:20In Java the (Signature) algorithm name DSA is an alias for SHA1withDSA, i.e. the original FIPS186-0 algorithm. This is not the same as the nonstandard 'raw' primitive apparently implemented by Go. NONEwithDSA is indeed the correct Java name for what you want, but the implementation in the 'standard' (SUN) provider is something of a kludge that requires exactly 20 bytes of data, not more or less, because that was the size of the SHA1 hash which was the only standard hash for DSA prior to FIPS186-3.
If you (have or can get and) use the BouncyCastle provider, it does not have this restriction, and should work for your code changed to NONEwithDSA (and either the code or security config modified so that BC is selected as the provider, of course).
If you don't use Bouncy, I think you'll have to code the algorithm yourself; I don't think there's any way to get the SUN implementation to do what you want.
Although it would be better to sign a properly-sized hash as specified in the standard, not raw data, and then you could use the Java providers as specified and designed.
QUESTION
I want to sign a SHA-256 hash with DSA.
Using Java I can write:
...ANSWER
Answered 2021-Aug-31 at 06:35The only instance of checking a DSAWithSHA256 signature in go is in github.com/avast/apkverifier
QUESTION
I have a flow like this:
...ANSWER
Answered 2021-Jan-05 at 09:07First you apply take
QUESTION
I am trying really hard to convert Ethereum private keys BIP44 in string format to a type that can (*ecdsa.PrivateKey) be used by rest of the code.
...ANSWER
Answered 2020-Dec-30 at 16:42Here is how a private key can be converted to Ethereum address You need to import one additional package "crypto/ecdsa" and also remove "0x" from the private key.
QUESTION
Now that I have some spare time on my hands, I decided to create a Java program to connect my XBee (i.e. zigbee) chips to my new SmartThings hub. I found a nice tutorial on doing this by creating the packets by hand (https://nzfalco.jimdofree.com/electronic-projects/xbee-to-smartthings/). My next task is to create a set of Java routines to create, send, receive, and access the required packets (i.e. a sequence of bytes).
Having done similar in C for other projects, my first thought was to simple create a class with the packet structure and send it. Something like this:
...ANSWER
Answered 2020-Apr-09 at 15:53To build a block of bytes for transmitting, I recommend using the built-in ByteBuffer, which e.g. has helpers for 16-, 32-, and 64-bit integers in big- or little-endian.
You should then store the values as you use them, e.g.
QUESTION
I have a working Java code for encryption of string in AES encryption using the key , and i have been trying the replicate the code in Nodejs for quite long but unable to get the exact encrypted hash output as Java code gives me. Please let me know what i have been doing wrong.
Encrypt.java
...ANSWER
Answered 2020-Feb-27 at 07:39let crypto = require('crypto');
var iv = new Buffer.from(''); //(null) iv
var algorithm = 'aes-256-ecb';
var password = 'a4e1112f45e84f785358bb86ba750f48'; //key password for cryptography
function encrypt(buffer){
var cipher = crypto.createCipheriv(algorithm,new Buffer(password),iv)
var crypted = Buffer.concat([cipher.update(buffer),cipher.final()]);
return crypted;
}
console.log(encrypt(new Buffer('TextToEncrypt')).toString())
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install hexutil
You can use hexutil like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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