Recently, I encountered an AES encryption algorithm that needs to be implemented in Java, Python, and PHP. In fact, it is not very complicated in nature, but the parameter adjustment is quite troublesome. I found some reference materials and finally got it. The actual code is as follows: Main features The three languages of JAVA, […]
Tag: padding
The impact of signal zero padding on the signal spectrum
Article directory Preface 1. What is zero padding? 2. Case 3. Simulation and analysis before zero padding 1. MATLAB source code before zero padding 2. Simulation and result analysis ①、 x n x_n xn? time domain diagram ②、 x n x_n xn? spectrogram 4. Simulation and analysis after zero padding 1. Add 6000 zeros and […]
The difference between cellspacing and cellpadding in table
What is table? It is composed of cells. In the table, the number of depends on the number of cells wrapped in in each row! In addition, the default table table will not have table lines displayed in the browser before adding the css style table tr td,th{border:1px solid #000;}; Common table writing methods in […]
4. Container and its younger brothers (Align, Center, Padding, DecoratedBox)
1. Align Align is a Flutter widget that allows you to align its sub-widgets to a specified position and set the alignment offset. The Align widget has the following main properties: alignment (Type: AlignmentGeometry, required): Specifies the alignment of the child widget. Alignment can be defined using static properties in the Alignment class, for example: […]
Margin and padding in CSS
Table of Contents 1. margin 1. Concept and function 2. Basic grammar 3.Usage of margin 2. padding 1 Introduction 2. Basic grammar and requirements 3. Usage 4. Padding and element width Before talking about this, let’s look at a picture for easy understanding. 一、margin 1. Concept and function The CSS margin property is used to […]
Java implements national secret SM4/ECB/PKCS7Padding symmetric encryption and decryption
Java implements national secret SM4/ECB/PKCS7Padding symmetric encryption and decryption. For the convenience of demonstration, this question uses IntelliJ IDEA 2022.1 (Community Edition) to build the code. 1. Add the required jars to the pom.xml file <?xml version=”1.0″ encoding=”UTF-8″?> <project xmlns=”http://maven.apache.org/POM/4.0.0″ xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xsi:schemaLocation=”http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd”> <modelVersion>4.0.0</modelVersion> <groupId>org.example</groupId> <artifactId>SM345</artifactId> <version>1.0-SNAPSHOT</version> <properties> <maven.compiler.source>8</maven.compiler.source> <maven.compiler.target>8</maven.compiler.target> </properties> <dependencies> <!–sm3,sm4 encryption algorithm–> […]
Inner spacing padding and outer spacing margin
Padding Definition: Inner spacing—the space between an element and its content Attribute 1—Writing mode Attribute name: padding Common values: Attribute 2—One-way setting Scenario: Set padding separately for only a certain direction of the box Attribute name: padding – orientation noun Attribute value: number + px Example: <!DOCTYPE html> <html lang=”en”> <head> <meta charset=”UTF-8″> <meta name=”viewport” […]
Encrypted padding method (pkcs5/pkcs7/ISO10126 padding/ANSIX923 padding/Zeros padding) external padding
Due to SM2 and other encrypted grouping methods, each time the request is 16byte, it needs to be filled. The filling method is as follows: pkcs5/pkcs7/ISO10126 padding/ANSIX923 padding/Zeros padding explain: pkcs5 is a subset of pkcs7, specially used to fill 8 bytes or multiples of 8, pkcs7 can fill bytes into multiple bytes Definition of […]
padding-machines-for-tor
Build a padding machine from scratch This document describes the process of building a “filler” from scratch in Tor’s new circuit filling framework. A note was taken during the porting of Adaptive Padding (APE) from basket2 to the Circuit Population framework. Our goal is just to document the whole process and provide useful guidance, not […]
[JS Utils] formatNumber number formatting (supports high precision, de-scientific notation, control size range, integer zero padding, supplementary thousandth symbol)
formatNumber (number formatting) Brief description: It is used to format numeric text or numeric-like values, supports high-precision calculations, de-scientific notation, control size range, integer zero padding, supplementary thousandth symbol, radix conversion (In development). Compatibility: The ES6 environment must be supported at least, the ES7 environment must be supported for zero padding or high-precision calculations, and […]