diff --git a/Cookie Byte_TY_12/15_days_report_1.docx.pdf b/Cookie Byte_TY_12/15_days_report_1.docx.pdf new file mode 100644 index 0000000..e66f87a Binary files /dev/null and b/Cookie Byte_TY_12/15_days_report_1.docx.pdf differ diff --git a/Cookie Byte_TY_12/Blockchain/blockchain b/Cookie Byte_TY_12/Blockchain/blockchain new file mode 100644 index 0000000..9c75582 Binary files /dev/null and b/Cookie Byte_TY_12/Blockchain/blockchain differ diff --git a/Cookie Byte_TY_12/Blockchain/blockchain.data b/Cookie Byte_TY_12/Blockchain/blockchain.data new file mode 100644 index 0000000..f676d3a Binary files /dev/null and b/Cookie Byte_TY_12/Blockchain/blockchain.data differ diff --git a/Cookie Byte_TY_12/Blockchain/blockchain.txt b/Cookie Byte_TY_12/Blockchain/blockchain.txt new file mode 100644 index 0000000..412e081 Binary files /dev/null and b/Cookie Byte_TY_12/Blockchain/blockchain.txt differ diff --git a/Cookie Byte_TY_12/Blockchain/mvnw b/Cookie Byte_TY_12/Blockchain/mvnw new file mode 100644 index 0000000..8a8fb22 --- /dev/null +++ b/Cookie Byte_TY_12/Blockchain/mvnw @@ -0,0 +1,316 @@ +#!/bin/sh +# ---------------------------------------------------------------------------- +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, +# software distributed under the License is distributed on an +# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +# KIND, either express or implied. See the License for the +# specific language governing permissions and limitations +# under the License. +# ---------------------------------------------------------------------------- + +# ---------------------------------------------------------------------------- +# Maven Start Up Batch script +# +# Required ENV vars: +# ------------------ +# JAVA_HOME - location of a JDK home dir +# +# Optional ENV vars +# ----------------- +# M2_HOME - location of maven2's installed home dir +# MAVEN_OPTS - parameters passed to the Java VM when running Maven +# e.g. to debug Maven itself, use +# set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000 +# MAVEN_SKIP_RC - flag to disable loading of mavenrc files +# ---------------------------------------------------------------------------- + +if [ -z "$MAVEN_SKIP_RC" ] ; then + + if [ -f /usr/local/etc/mavenrc ] ; then + . /usr/local/etc/mavenrc + fi + + if [ -f /etc/mavenrc ] ; then + . /etc/mavenrc + fi + + if [ -f "$HOME/.mavenrc" ] ; then + . "$HOME/.mavenrc" + fi + +fi + +# OS specific support. $var _must_ be set to either true or false. +cygwin=false; +darwin=false; +mingw=false +case "`uname`" in + CYGWIN*) cygwin=true ;; + MINGW*) mingw=true;; + Darwin*) darwin=true + # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home + # See https://developer.apple.com/library/mac/qa/qa1170/_index.html + if [ -z "$JAVA_HOME" ]; then + if [ -x "/usr/libexec/java_home" ]; then + export JAVA_HOME="`/usr/libexec/java_home`" + else + export JAVA_HOME="/Library/Java/Home" + fi + fi + ;; +esac + +if [ -z "$JAVA_HOME" ] ; then + if [ -r /etc/gentoo-release ] ; then + JAVA_HOME=`java-config --jre-home` + fi +fi + +if [ -z "$M2_HOME" ] ; then + ## resolve links - $0 may be a link to maven's home + PRG="$0" + + # need this for relative symlinks + while [ -h "$PRG" ] ; do + ls=`ls -ld "$PRG"` + link=`expr "$ls" : '.*-> \(.*\)$'` + if expr "$link" : '/.*' > /dev/null; then + PRG="$link" + else + PRG="`dirname "$PRG"`/$link" + fi + done + + saveddir=`pwd` + + M2_HOME=`dirname "$PRG"`/.. + + # make it fully qualified + M2_HOME=`cd "$M2_HOME" && pwd` + + cd "$saveddir" + # echo Using m2 at $M2_HOME +fi + +# For Cygwin, ensure paths are in UNIX format before anything is touched +if $cygwin ; then + [ -n "$M2_HOME" ] && + M2_HOME=`cygpath --unix "$M2_HOME"` + [ -n "$JAVA_HOME" ] && + JAVA_HOME=`cygpath --unix "$JAVA_HOME"` + [ -n "$CLASSPATH" ] && + CLASSPATH=`cygpath --path --unix "$CLASSPATH"` +fi + +# For Mingw, ensure paths are in UNIX format before anything is touched +if $mingw ; then + [ -n "$M2_HOME" ] && + M2_HOME="`(cd "$M2_HOME"; pwd)`" + [ -n "$JAVA_HOME" ] && + JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`" +fi + +if [ -z "$JAVA_HOME" ]; then + javaExecutable="`which javac`" + if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then + # readlink(1) is not available as standard on Solaris 10. + readLink=`which readlink` + if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then + if $darwin ; then + javaHome="`dirname \"$javaExecutable\"`" + javaExecutable="`cd \"$javaHome\" && pwd -P`/javac" + else + javaExecutable="`readlink -f \"$javaExecutable\"`" + fi + javaHome="`dirname \"$javaExecutable\"`" + javaHome=`expr "$javaHome" : '\(.*\)/bin'` + JAVA_HOME="$javaHome" + export JAVA_HOME + fi + fi +fi + +if [ -z "$JAVACMD" ] ; then + if [ -n "$JAVA_HOME" ] ; then + if [ -x "$JAVA_HOME/jre/sh/java" ] ; then + # IBM's JDK on AIX uses strange locations for the executables + JAVACMD="$JAVA_HOME/jre/sh/java" + else + JAVACMD="$JAVA_HOME/bin/java" + fi + else + JAVACMD="`\\unset -f command; \\command -v java`" + fi +fi + +if [ ! -x "$JAVACMD" ] ; then + echo "Error: JAVA_HOME is not defined correctly." >&2 + echo " We cannot execute $JAVACMD" >&2 + exit 1 +fi + +if [ -z "$JAVA_HOME" ] ; then + echo "Warning: JAVA_HOME environment variable is not set." +fi + +CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher + +# traverses directory structure from process work directory to filesystem root +# first directory with .mvn subdirectory is considered project base directory +find_maven_basedir() { + + if [ -z "$1" ] + then + echo "Path not specified to find_maven_basedir" + return 1 + fi + + basedir="$1" + wdir="$1" + while [ "$wdir" != '/' ] ; do + if [ -d "$wdir"/.mvn ] ; then + basedir=$wdir + break + fi + # workaround for JBEAP-8937 (on Solaris 10/Sparc) + if [ -d "${wdir}" ]; then + wdir=`cd "$wdir/.."; pwd` + fi + # end of workaround + done + echo "${basedir}" +} + +# concatenates all lines of a file +concat_lines() { + if [ -f "$1" ]; then + echo "$(tr -s '\n' ' ' < "$1")" + fi +} + +BASE_DIR=`find_maven_basedir "$(pwd)"` +if [ -z "$BASE_DIR" ]; then + exit 1; +fi + +########################################################################################## +# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central +# This allows using the maven wrapper in projects that prohibit checking in binary data. +########################################################################################## +if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then + if [ "$MVNW_VERBOSE" = true ]; then + echo "Found .mvn/wrapper/maven-wrapper.jar" + fi +else + if [ "$MVNW_VERBOSE" = true ]; then + echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..." + fi + if [ -n "$MVNW_REPOURL" ]; then + jarUrl="$MVNW_REPOURL/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar" + else + jarUrl="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar" + fi + while IFS="=" read key value; do + case "$key" in (wrapperUrl) jarUrl="$value"; break ;; + esac + done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties" + if [ "$MVNW_VERBOSE" = true ]; then + echo "Downloading from: $jarUrl" + fi + wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" + if $cygwin; then + wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"` + fi + + if command -v wget > /dev/null; then + if [ "$MVNW_VERBOSE" = true ]; then + echo "Found wget ... using wget" + fi + if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then + wget "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath" + else + wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath" + fi + elif command -v curl > /dev/null; then + if [ "$MVNW_VERBOSE" = true ]; then + echo "Found curl ... using curl" + fi + if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then + curl -o "$wrapperJarPath" "$jarUrl" -f + else + curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f + fi + + else + if [ "$MVNW_VERBOSE" = true ]; then + echo "Falling back to using Java to download" + fi + javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java" + # For Cygwin, switch paths to Windows format before running javac + if $cygwin; then + javaClass=`cygpath --path --windows "$javaClass"` + fi + if [ -e "$javaClass" ]; then + if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then + if [ "$MVNW_VERBOSE" = true ]; then + echo " - Compiling MavenWrapperDownloader.java ..." + fi + # Compiling the Java class + ("$JAVA_HOME/bin/javac" "$javaClass") + fi + if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then + # Running the downloader + if [ "$MVNW_VERBOSE" = true ]; then + echo " - Running MavenWrapperDownloader.java ..." + fi + ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR") + fi + fi + fi +fi +########################################################################################## +# End of extension +########################################################################################## + +export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"} +if [ "$MVNW_VERBOSE" = true ]; then + echo $MAVEN_PROJECTBASEDIR +fi +MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS" + +# For Cygwin, switch paths to Windows format before running java +if $cygwin; then + [ -n "$M2_HOME" ] && + M2_HOME=`cygpath --path --windows "$M2_HOME"` + [ -n "$JAVA_HOME" ] && + JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"` + [ -n "$CLASSPATH" ] && + CLASSPATH=`cygpath --path --windows "$CLASSPATH"` + [ -n "$MAVEN_PROJECTBASEDIR" ] && + MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"` +fi + +# Provide a "standardized" way to retrieve the CLI args that will +# work with both Windows and non-Windows executions. +MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@" +export MAVEN_CMD_LINE_ARGS + +WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain + +exec "$JAVACMD" \ + $MAVEN_OPTS \ + $MAVEN_DEBUG_OPTS \ + -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \ + "-Dmaven.home=${M2_HOME}" \ + "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \ + ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@" diff --git a/Cookie Byte_TY_12/Blockchain/mvnw.cmd b/Cookie Byte_TY_12/Blockchain/mvnw.cmd new file mode 100644 index 0000000..1d8ab01 --- /dev/null +++ b/Cookie Byte_TY_12/Blockchain/mvnw.cmd @@ -0,0 +1,188 @@ +@REM ---------------------------------------------------------------------------- +@REM Licensed to the Apache Software Foundation (ASF) under one +@REM or more contributor license agreements. See the NOTICE file +@REM distributed with this work for additional information +@REM regarding copyright ownership. The ASF licenses this file +@REM to you under the Apache License, Version 2.0 (the +@REM "License"); you may not use this file except in compliance +@REM with the License. You may obtain a copy of the License at +@REM +@REM https://www.apache.org/licenses/LICENSE-2.0 +@REM +@REM Unless required by applicable law or agreed to in writing, +@REM software distributed under the License is distributed on an +@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +@REM KIND, either express or implied. See the License for the +@REM specific language governing permissions and limitations +@REM under the License. +@REM ---------------------------------------------------------------------------- + +@REM ---------------------------------------------------------------------------- +@REM Maven Start Up Batch script +@REM +@REM Required ENV vars: +@REM JAVA_HOME - location of a JDK home dir +@REM +@REM Optional ENV vars +@REM M2_HOME - location of maven2's installed home dir +@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands +@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending +@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven +@REM e.g. to debug Maven itself, use +@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000 +@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files +@REM ---------------------------------------------------------------------------- + +@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on' +@echo off +@REM set title of command window +title %0 +@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on' +@if "%MAVEN_BATCH_ECHO%" == "on" echo %MAVEN_BATCH_ECHO% + +@REM set %HOME% to equivalent of $HOME +if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%") + +@REM Execute a user defined script before this one +if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre +@REM check for pre script, once with legacy .bat ending and once with .cmd ending +if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %* +if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %* +:skipRcPre + +@setlocal + +set ERROR_CODE=0 + +@REM To isolate internal variables from possible post scripts, we use another setlocal +@setlocal + +@REM ==== START VALIDATION ==== +if not "%JAVA_HOME%" == "" goto OkJHome + +echo. +echo Error: JAVA_HOME not found in your environment. >&2 +echo Please set the JAVA_HOME variable in your environment to match the >&2 +echo location of your Java installation. >&2 +echo. +goto error + +:OkJHome +if exist "%JAVA_HOME%\bin\java.exe" goto init + +echo. +echo Error: JAVA_HOME is set to an invalid directory. >&2 +echo JAVA_HOME = "%JAVA_HOME%" >&2 +echo Please set the JAVA_HOME variable in your environment to match the >&2 +echo location of your Java installation. >&2 +echo. +goto error + +@REM ==== END VALIDATION ==== + +:init + +@REM Find the project base dir, i.e. the directory that contains the folder ".mvn". +@REM Fallback to current working directory if not found. + +set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR% +IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir + +set EXEC_DIR=%CD% +set WDIR=%EXEC_DIR% +:findBaseDir +IF EXIST "%WDIR%"\.mvn goto baseDirFound +cd .. +IF "%WDIR%"=="%CD%" goto baseDirNotFound +set WDIR=%CD% +goto findBaseDir + +:baseDirFound +set MAVEN_PROJECTBASEDIR=%WDIR% +cd "%EXEC_DIR%" +goto endDetectBaseDir + +:baseDirNotFound +set MAVEN_PROJECTBASEDIR=%EXEC_DIR% +cd "%EXEC_DIR%" + +:endDetectBaseDir + +IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig + +@setlocal EnableExtensions EnableDelayedExpansion +for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a +@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS% + +:endReadAdditionalConfig + +SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe" +set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar" +set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain + +set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar" + +FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO ( + IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B +) + +@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central +@REM This allows using the maven wrapper in projects that prohibit checking in binary data. +if exist %WRAPPER_JAR% ( + if "%MVNW_VERBOSE%" == "true" ( + echo Found %WRAPPER_JAR% + ) +) else ( + if not "%MVNW_REPOURL%" == "" ( + SET DOWNLOAD_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar" + ) + if "%MVNW_VERBOSE%" == "true" ( + echo Couldn't find %WRAPPER_JAR%, downloading it ... + echo Downloading from: %DOWNLOAD_URL% + ) + + powershell -Command "&{"^ + "$webclient = new-object System.Net.WebClient;"^ + "if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^ + "$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^ + "}"^ + "[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^ + "}" + if "%MVNW_VERBOSE%" == "true" ( + echo Finished downloading %WRAPPER_JAR% + ) +) +@REM End of extension + +@REM Provide a "standardized" way to retrieve the CLI args that will +@REM work with both Windows and non-Windows executions. +set MAVEN_CMD_LINE_ARGS=%* + +%MAVEN_JAVA_EXE% ^ + %JVM_CONFIG_MAVEN_PROPS% ^ + %MAVEN_OPTS% ^ + %MAVEN_DEBUG_OPTS% ^ + -classpath %WRAPPER_JAR% ^ + "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^ + %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %* +if ERRORLEVEL 1 goto error +goto end + +:error +set ERROR_CODE=1 + +:end +@endlocal & set ERROR_CODE=%ERROR_CODE% + +if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost +@REM check for post script, once with legacy .bat ending and once with .cmd ending +if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat" +if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd" +:skipRcPost + +@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on' +if "%MAVEN_BATCH_PAUSE%"=="on" pause + +if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE% + +cmd /C exit /B %ERROR_CODE% diff --git a/Cookie Byte_TY_12/Blockchain/pom.xml b/Cookie Byte_TY_12/Blockchain/pom.xml new file mode 100644 index 0000000..4c10671 --- /dev/null +++ b/Cookie Byte_TY_12/Blockchain/pom.xml @@ -0,0 +1,77 @@ + + + 4.0.0 + + com.loop.buffer + BlockchainDSA + 1.0-SNAPSHOT + BlockchainDSA + + + UTF-8 + 5.9.1 + + + + + org.openjfx + javafx-controls + 18.0.2 + + + org.openjfx + javafx-fxml + 18.0.2 + + + + org.junit.jupiter + junit-jupiter-api + ${junit.version} + test + + + org.junit.jupiter + junit-jupiter-engine + ${junit.version} + test + + + + + + + org.apache.maven.plugins + maven-compiler-plugin + 3.10.1 + + 18 + 18 + + + + org.openjfx + javafx-maven-plugin + 0.0.8 + + + + default-cli + + com.loop.buffer.blockchaindsa/com.loop.buffer.blockchaindsa.HelloApplication + + app + app + app + true + true + true + + + + + + + \ No newline at end of file diff --git a/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Block.java b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Block.java new file mode 100644 index 0000000..3c49668 --- /dev/null +++ b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Block.java @@ -0,0 +1,60 @@ +package com.loop.buffer.blockchaindsa; + +import java.io.Serializable; + +class Block implements Serializable { + private static final long serialVersionUID = 1L; + private final int minerName; + private final int id; + private final long timeStamp; + private final long magicNumber; + private final String previousHash; + private final String hash; + private final long proofOfWork; + private final String N; + + public Block(int minerName, int id, long timeStamp, long magicNumber, String previousHash, String hash, long proofOfWork, String N) { + this.minerName = minerName; + this.id = id; + this.timeStamp = timeStamp; + this.magicNumber = magicNumber; + this.previousHash = previousHash; + this.hash = hash; + this.proofOfWork = proofOfWork; + this.N = N; + } + + public int getId() { + return id; + } + + public long getTimeStamp() { + return timeStamp; + } + + public long getMagicNumber() { + return magicNumber; + } + + public String getHash() { + return hash; + } + + public int getN() { + return Integer.parseInt(N.replaceAll("[^0-9]", "")); + } + + @Override + public String toString() { + return "\nBlock:" + + "\nCreated by miner # " + minerName + + "\nMiner: " + minerName + " gets 100 VC" + + "\nId: " + id + + "\nTimestamp: " + timeStamp + + "\nMagic number: " + magicNumber + + "\nHash of the previous block: \n" + previousHash + + "\nHash of the block: \n" + hash + + "\nBlock was generating for " + proofOfWork + " timeUnits" + + "\n" + N; + } +} \ No newline at end of file diff --git a/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Blockchain.java b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Blockchain.java new file mode 100644 index 0000000..5982150 --- /dev/null +++ b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Blockchain.java @@ -0,0 +1,64 @@ +package com.loop.buffer.blockchaindsa; + +import java.util.ArrayList; + +public class Blockchain { + + private static Blockchain blockChain; + private Blockchain() {} + public static Blockchain getBlockChain() { + if (blockChain==null) { + blockChain = new Blockchain(); + } + return blockChain; + } + + ArrayList blockChainList = new ArrayList<>(); + + String zeros() { + + int n = blockChainList.size() == 0 ? 0 : blockChainList.get(blockChainList.size() - 1).getN(); + StringBuilder stringBuilder = new StringBuilder(); + return String.valueOf(stringBuilder.append("0".repeat(n))); + } + + String updateZeros(long proofOfWork) { + + int n = blockChainList.size() == 0 ? 0 : blockChainList.get(blockChainList.size() - 1).getN(); + + if (proofOfWork < 500) { + n++; + return "N was increased to " + n; + } else if (proofOfWork >2000) { + n--; + return "N was decreased to " + n; + } else { + return "N stays the same - " + n; + } + } + + boolean isValid(Block block) { + + if(block.getHash().startsWith(zeros()) || blockChainList.size() == 0) { + blockChainList.add(block); + + if (blockChainList.size() > 1) { + for (int i = blockChainList.size() - 1; i > 0; i--) { + if (!blockChainList.get(i).getHash().equals(SHA256.applySha256(blockChainList.get(i - 1).getHash() + + blockChainList.get(i).getId() + blockChainList.get(i).getTimeStamp() + blockChainList.get(i).getMagicNumber()))) { + + System.out.println("Block " + blockChainList.get(i).getId() + " is not valid!"); + + if (blockChainList.size() > i) { + blockChainList.subList(i, blockChainList.size()).clear(); + } + return false; + } + } + } + } else { + return false; + } + return true; + } +} \ No newline at end of file diff --git a/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Main.java b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Main.java new file mode 100644 index 0000000..caf897c --- /dev/null +++ b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Main.java @@ -0,0 +1,9 @@ +package com.loop.buffer.blockchaindsa; + + +public class Main { + public static void main(String[] args) { + + Session.newMiner(); + } +} \ No newline at end of file diff --git a/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Miner.java b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Miner.java new file mode 100644 index 0000000..c124146 --- /dev/null +++ b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Miner.java @@ -0,0 +1,51 @@ +package com.loop.buffer.blockchaindsa; + +import java.util.Date; +import java.util.Random; + +public class Miner extends Thread { + + int name; + public Miner(int name) { + this.name = name; + } + + Random random = new Random(); + Block block; + private static final Object lock = new Object(); + + void generateBlock() { + + synchronized (lock) { + int id = Blockchain.getBlockChain().blockChainList.size() + 1; + long timeStamp = new Date().getTime(); + int magicNumber; + String previousHash = id == 1 ? "0" : Blockchain.getBlockChain().blockChainList.get(id - 2).getHash(); + + String hash; + do { + magicNumber = random.nextInt(Integer.MAX_VALUE); + hash = SHA256.applySha256(previousHash + id + timeStamp + magicNumber); + } while (!hash.startsWith(Blockchain.getBlockChain().zeros())); + + long proofOfWork = (new Date().getTime() - timeStamp) ; + + String N = Blockchain.getBlockChain().updateZeros(proofOfWork); + + block = new Block(name, id, timeStamp, magicNumber, previousHash, hash, proofOfWork, N); + + if (Blockchain.getBlockChain().isValid(block)) { + System.out.println(block); + } else if (Blockchain.getBlockChain().blockChainList.size() == 1) { + System.out.println(block); + } else { + System.out.println("Block not accepted!"); + } + } + } + + @Override + public void run() { + generateBlock(); + } +} \ No newline at end of file diff --git a/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/SHA256.java b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/SHA256.java new file mode 100644 index 0000000..b7a4135 --- /dev/null +++ b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/SHA256.java @@ -0,0 +1,23 @@ +package com.loop.buffer.blockchaindsa; + +import java.security.MessageDigest; + +public class SHA256 { + public static String applySha256(String s){ + try { + MessageDigest digest = MessageDigest.getInstance("SHA-256"); +// appply to input string s + byte[] hash = digest.digest(s.getBytes("UTF-8")); + StringBuilder hexString = new StringBuilder(); + for (byte elem: hash) { + String hex = Integer.toHexString(0xff & elem); + if(hex.length() == 1) hexString.append('0'); + hexString.append(hex); + } + return hexString.toString(); + } + catch(Exception e) { + throw new RuntimeException(e); + } + } +} \ No newline at end of file diff --git a/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/SerializationUtils.java b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/SerializationUtils.java new file mode 100644 index 0000000..98434ff --- /dev/null +++ b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/SerializationUtils.java @@ -0,0 +1,21 @@ +package com.loop.buffer.blockchaindsa; + +import java.io.*; + +public class SerializationUtils { + + public static void serialize(Object obj, String fileName) throws IOException { + FileOutputStream fos = new FileOutputStream(fileName); + ObjectOutputStream oos = new ObjectOutputStream(fos); + oos.writeObject(obj); + oos.close(); + } + + public static Object deserialize(String fileName) throws IOException, ClassNotFoundException { + FileInputStream fis = new FileInputStream(fileName); + ObjectInputStream ois = new ObjectInputStream(fis); + Object obj = ois.readObject(); + ois.close(); + return obj; + } +} \ No newline at end of file diff --git a/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Session.java b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Session.java new file mode 100644 index 0000000..7f9ede0 --- /dev/null +++ b/Cookie Byte_TY_12/Blockchain/src/main/java/com/loop/buffer/blockchaindsa/Session.java @@ -0,0 +1,61 @@ +package com.loop.buffer.blockchaindsa; + +import java.io.File; +import java.io.IOException; +import java.util.ArrayList; +import java.util.Scanner; + +public class Session { + public static void newMiner(){ + Scanner scanner = new Scanner(System.in); + String fileName = "blockchain.data"; + File file = new File(fileName); + if (file.length() != 0) { + try { + Blockchain.getBlockChain().blockChainList = (ArrayList) SerializationUtils.deserialize(fileName); + } catch (IOException | ClassNotFoundException e) { + e.printStackTrace(); + } + } + Miner[] miners; + System.out.println("Enter the no. of miners you want to create: "); + int num = scanner.nextInt(); + miners = new Miner[num]; + for(int i = 0; i + + + + + + + + + + + +