Vulnerability Check of Logjam Attack

 Run command "openssl s_client -connect ${SERVER}:${PORT} -cipher "EDH" | grep "Server Temp Key"" found in following article

https://security.stackexchange.com/questions/89773/how-to-check-if-a-server-is-not-vulnerable-to-logjam

(Note that openssl version used for testing needs to be 1.0.2 or above)

The key needs to be at least 2048 to be ok.

Enable PWA for React App

1. Create project "npx create-react-app myapp --template cra-template-pwa"

2. Update "App.css" and "App.js" with the desired functionality implementation

3. Change "serviceWorkerRegistration.unregister()" of "index.js" to "serviceWorkerRegistration.register()"

4. Deploy the app

Enable Running iOS Simulator with XCode on Mac M1

post_install do |installer|
 installer.pods_project.build_configurations.each do |config|
  config.build_settings["EXCLUDED_ARCHS[sdk=iphonesimulator*]"] = "arm64"
 end
end

Install CMake on Mac

 Could be achieved with the following steps:

1. Download CMake dmg file from https://cmake.org/download/
2. Install CMake with dmg file
3. sudo "/Applications/CMake.app/Contents/bin/cmake-gui" --install

Note: Instead of install VSCode with CMake, could also consider to generate XCode project file with command "cmake -G XCode ."

Deploy React App to Firebase

1. Install Firebase CLI

    sudo npm install -g firebase-tools

2. Login to Firebase
    firebase login

3. Initiate your project
    firebase init
    (a) Select "Hosting"
    (b) Choose "Use an existing project" (if already created)
    (c) Choose the desired project
    (d) Enter "build" for public directory
    (e) Enter "No" for single-page app
    (f) Enter "N" to avoid overwritten index.html

4. Perform "npm run build"

5. Deploy with "firebase deploy"

Note: The above command is recommended to be executed in the React project directory

Reference: https://dzone.com/articles/react-apps-firebase

Setup Unit Test and Code Coverage for C++ in Linux

Setup Unit Test

1. Clone Google Test repo https://github.com/google/googletest
2. Checkout latest release tag (Optional)
3. Install the gtest library with the following commands:
   a. mkdir build
   b. cd build
   c. cmake ..
   d. sudo make install

Setup Code Coverage

1. Get lcov source code tar bar from http://ltp.sourceforge.net/coverage/lcov.php
2. Extract lcov tar ball
3. Execute  sudo make install 

Implementation

At the beginning of "CMakeLists.txt", include the "test" option to allow test running to be optional.

option(test "Build and tests." OFF) # Makes boolean 'test' available.

In addition, at the end of "CMakeLists.txt", include the following.  Add more files under "add_executable" to include more unit tests.

if (test)

    enable_testing()

    add_executable(runUnitTests

        main_test.cpp)

    target_link_libraries(runUnitTests -pthread

        gtest gtest_main

        gcov

        )

    target_compile_options(runUnitTests PRIVATE

        -std=c++11

        -Wall

        -fprofile-arcs

        -ftest-coverage

        )

    add_test(NAME unittest COMMAND runUnitTests)

endif()

The following should be included in "main_test.cpp":

#include <gtest/gtest.h>

int main(int argc, char *argv[]) {

::testing::InitGoogleTest(&argc, argv);

return RUN_ALL_TESTS();

}

Running Unit Test and Generate Code Coverage Report

./runUnitTests --gtest_output="xml:gtest.xml"

gcov main_test.cpp.gcno

lcov --capture --directory . --output-file LCOVOUTPUT.info

genhtml LCOVOUTPUT.info --output-directory ./code_coverage

Enable CocoaPods on Mac M1

 

1. Duplicate the Terminal application in the Utilities folder.
2. Right click on the app and choose Get Info.
3. Rename the other version of the app as you like.
4. Check the option "open with Rosetta".
5. Install Cocoapods with the command "sudo gem install cocoapods"
6. Type the command line "gem install ffi" to fix the ffi bundle problem. Now you can do a "pod install" without problem.

Courtesy from https://stackoverflow.com/questions/64901180/running-cocoapods-on-apple-silicon-m1

Secure Remote Password (SRP)

https://en.wikipedia.org/wiki/Secure_Remote_Password_protocol

1. Client sends username

2. Server gets username and sends salt and B

3. Client gets salt and B, sends A (randomized number) and M1 (calculate with salt, B, A and password, S_Carol = (B − kg^x)^(a + ux))

4. Server verifies M1

ppk to pem

 From https://tecadmin.net/convert-ppk-to-pem-using-command/

1. sudo apt-get install putty-tools

2. puttygen server1.ppk -O private-openssh -o server1.pem

Convert to private-public key

https://www.tbs-certificates.co.uk/FAQ/en/putty-ppk-vers-openssl-openssh.html

Using CocoaPods in IOS

After "pod install", open ".xcworkspace" instead of ".xcodeproj". Otherwise, the module could not be imported during compilation.

Import SSL certication into Java Keystore

Prerequisite: "*.crt", "*.key" from CA, assume the file names are "cert.crt" and "cert.key"
Steps to be performed in Windows desktop:

1. Rename "cert.crt" to "cert.cer" in Windows
2. Double click "cert.cer" and "Ceritificate" popup window should be displayed
3. Click "Certification Path" tab
4. Double click intermediate certification, eg. "GeoTrust RSA CA 2018", another "Certificate" popup window should be displayed
5. Click "Details" tab
6. Click "Copy to File..." button and save the content as "intermediate.cer"
7. Click "Certification Path" tab again"
8. Double click root certification, eg. "DigiCert", another "Certificate" popup window should be displayed
9. Click "Details" tab
10. Click "Copy to File..." button and save the content as "root.cer"
11. Concatenate "intermediate.cer" and "root.cer" into "allca.cer", eg. with command "cat intermediate.cer root.cer > allca.cer"
12. Execute command "openssl pkcs12 -export -in cert.crt -inkey cert.key -out cert.p12 -name {aliasname} -CAfile allca.cer -caname root -chain"
13. Append "$JAVA_HOME/bin" to "PATH" of cygwin, eg. "export PATH=$PATH:$JAVA_HOME/bin"
14. Execute command "keytool -importkeystore -deststorepass {password} -destkeystore cert.jks -srckeystore cert.p12 -srcstoretype PKCS12 -srcstorepass {password} -alias {aliasname}"

To verify, use command "keytool -list -v -keystore cert.jks -storepass {password}".

The Garbage Collection Handbook

To read regarding GIL in python

Terms to be checked after Python article reading

Regarding "Python is eating the world: How one developer's side project became the hottest programming language on the planet":
Global Interpreter Lock
https://realpython.com/python-gil/

4GL, New term heard today

https://docs.google.com/document/d/e/2PACX-1vQUGG28baEuS7RgpPpexNbxRxJfjzc6r43yhZoLF_56n7aacke-uVEdNVQxvkPf1NxsEuJfkMK0MCvi/pub

To avoid overlapping during typing, add following lines into .bashrc

PS1='\[\e[32m\]\u@\h:\W> \[\e[0m\]'
TERM=cygwin
export PS1
export TERM

Install sshpass for cygwin

$ curl -LO http://downloads.sourceforge.net/sshpass/sshpass-1.06.tar.gz
$ md5sum sshpass-1.06.tar.gz
$ tar xvf sshpass-1.06.tar.gz
$ cd sshpass-1.06
$ ./configure
$ make
$ make install

Big Fat Jar Compilation

 mvn clean install -P fat-jar package shade:shade@spark-fat-jar assembly:single

Check whether changes happen in multiple git repositories

for /f "tokens=*" %%a in ('dir /ad /b') do cd %%a & git status & cd ..

Thanks for the answers in https://stackoverflow.com/questions/24352701/check-status-of-all-git-repositories-at-once

Maven Tutorial

https://www.baeldung.com/maven

Explains, how to specify module dependencies and module hierarchies

Java Unit Test

Function name of test function needs to be started with "test"