Added ZoKrates Kotlin library

CCTF_Solutions_main/.gitattributes

@@ -0,0 +1,9 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+

CCTF_Solutions_main/build.gradle.kts

@@ -0,0 +1,29 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+    kotlin("jvm") version "1.7.10"
+    application
+}
+
+group = "me.balazs"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation(kotlin("test"))
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+
+tasks.withType<KotlinCompile> {
+    kotlinOptions.jvmTarget = "1.8"
+}
+
+application {
+    mainClass.set("MainKt")
+}

CCTF_Solutions_main/gradle.properties

@@ -0,0 +1 @@
+kotlin.code.style=official

CCTF_Solutions_main/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

CCTF_Solutions_main/gradlew

@@ -0,0 +1,240 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed 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.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$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=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

CCTF_Solutions_main/gradlew.bat

@@ -0,0 +1,91 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem 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, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

CCTF_Solutions_main/proof.json

@@ -0,0 +1,40 @@
+{
+  "scheme": "gm17",
+  "curve": "bn128",
+  "proof": {
+    "a": [
+      "0x2e2f42c53f6798af69959d12e5430c7ad95e996fb70cb8c36e4a231b2ac03c0b",
+      "0x2a5c123e0d79b4bba8737b9e39907143e64262f2ba57dbbe45d452d854fc5738"
+    ],
+    "b": [
+      [
+        "0x0dcfbdd263e303b9b91a4d9ed7a2744c813df33ccbe0084137afba2fb4ad5a44",
+        "0x19913fbe1ee4e378a7fa0bb42cc6aeafdae7ae3fb84987cee06670a9f3587703"
+      ],
+      [
+        "0x089188fa6a00185fefe01d7b8a36cdeb53c78ad8ca443dc65d550622486d5932",
+        "0x143a377418de72c160aeb2b25bbec57625ff725ea42576caaea29776572fec16"
+      ]
+    ],
+    "c": [
+      "0x0bd195f90adbfb7221a08ddbbf1cea3d8e1bd907399765534cdd0bf441edf816",
+      "0x2b100a24fb234a4222234ef1063db3aeeea3b220972f6530abec48444c35405b"
+    ]
+  },
+  "inputs": [
+    "0x0000000000000000000000000000000000000000000000000000000070f32e51",
+    "0x00000000000000000000000000000000000000000000000000000000f57163d9",
+    "0x000000000000000000000000000000000000000000000000000000009dbce41a",
+    "0x000000000000000000000000000000000000000000000000000000002e52e481",
+    "0x00000000000000000000000000000000000000000000000000000000b87d45c4",
+    "0x000000000000000000000000000000000000000000000000000000007999ce35",
+    "0x000000000000000000000000000000000000000000000000000000003063db54",
+    "0x00000000000000000000000000000000000000000000000000000000ad1fb776",
+
+    "0x000000000000000000000000000000000000000000000000000000005b38da6a",
+    "0x00000000000000000000000000000000000000000000000000000000701c5685",
+    "0x0000000000000000000000000000000000000000000000000000000045dcfcb0",
+    "0x000000000000000000000000000000000000000000000000000000003fcb875f",
+    "0x0000000000000000000000000000000000000000000000000000000056beddc4"
+  ]
+}

CCTF_Solutions_main/settings.gradle.kts

@@ -0,0 +1,10 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ *
+ * Detailed information about configuring a multi-project build in Gradle can be found
+ * in the user manual at https://docs.gradle.org/7.5.1/userguide/multi_project_builds.html
+ */
+
+rootProject.name = "PolkadotCCTFChallange"

CCTF_Solutions_main/src/main/kotlin/hu/bmeta/cctf/Main.kt

@@ -0,0 +1,26 @@
+package hu.bmeta.cctf
+
+fun main() {
+    val address = listOf("1530452586","1880905349","1172110512","1070303071","1455349188")
+    val message = listOf("104","116","116","112","115","58","47","47","119","119","119","46","121","111","117","116","117","98","101","46","99","111","109","47","119","97","116","99","104","63","118","61","100","81","119","52","119","57","87","103","88","99","81","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0")
+    Zokrates.initZokrates()
+    Zokrates.compile("hash.zok","hash")
+    val hashArgs = mutableListOf<String>()
+    hashArgs.addAll(address)
+    hashArgs.addAll(message)
+    val result = Zokrates.computeWithness(hashArgs,"hash")
+    println(result)
+
+    val zkpArgs = mutableListOf<String>()
+    zkpArgs.addAll(result)
+    zkpArgs.addAll(address)
+    zkpArgs.addAll(message)
+
+    Zokrates.compile("root.zok")
+    val results2 = Zokrates.computeWithness(zkpArgs)
+    println(results2)
+
+    Zokrates.generateProof(scheme = Zokrates.ProvingScheme.GM17)
+    Zokrates.verify()
+
+}

CCTF_Solutions_main/src/main/kotlin/hu/bmeta/cctf/ZoKrates.kt

@@ -0,0 +1,144 @@
+package hu.bmeta.cctf
+
+
+import java.io.File
+import java.lang.RuntimeException
+import java.net.URL
+
+object Zokrates {
+    enum class ProvingScheme{
+        G16,GM17
+    }
+
+    private var isInitDone = false
+    private lateinit var zokratesPath: String
+
+    private fun checkInit() {
+        if (isInitDone.not()) {
+            throw RuntimeException("")
+        }
+    }
+
+    private fun installZokrates() {
+        val tmp = File(System.getProperty("user.dir") + "/tmp").also { file ->
+            file.mkdir()
+        }
+        val dlFile = File(tmp, "zokrates.sh").also {
+            it.writeText(URL("https://raw.githubusercontent.com/ZoKrates/ZoKrates/master/scripts/one_liner.sh").readText())
+            it.setExecutable(true)
+        }
+
+        val pb = ProcessBuilder(dlFile.absoluteFile.absolutePath.toString(), "--to", ".zokrates")
+        val process = pb.start()
+
+        val exitCode = process.waitFor()
+        if (exitCode != 0) {
+            throw RuntimeException("")
+        }
+
+        dlFile.delete()
+        tmp.delete()
+    }
+
+    fun initZokrates() {
+        if (File(System.getProperty("user.dir") + "/.zokrates/bin/zokrates").exists().not()) {
+            installZokrates()
+        }
+
+        zokratesPath = System.getProperty("user.dir") + "/.zokrates/bin/zokrates"
+        isInitDone = true
+    }
+
+    fun compile(path: String, outPut: String = "out") {
+        checkInit()
+        compile(File(path), outPut)
+    }
+
+    fun compile(file: File, outPut: String = "out") {
+        checkInit()
+        val pb = ProcessBuilder(zokratesPath, "compile", "-i", file.absoluteFile.absolutePath.toString(), "-o", outPut)
+
+        val process = pb.start()
+
+        val exitCode = process.waitFor()
+        if (exitCode != 0) {
+            val output = process.inputStream.bufferedReader().use { it.readText() }
+            throw throw RuntimeException(output)
+        }
+    }
+
+    fun computeWithness(args: List<String>, input: String = "out", output: String = "witness"): List<String> {
+        checkInit()
+        val sb = StringBuilder()
+        var prefix = ""
+        args.forEach {
+            sb.append(prefix)
+            prefix = " "
+            sb.append(it)
+        }
+        println(sb.toString())
+        val command = mutableListOf(zokratesPath, "compute-witness", "-i", input, "-o", output, "-a").apply {
+            addAll(args)
+        }
+        val processBuilder = ProcessBuilder(command)
+
+        val process = processBuilder.start()
+
+        val exitCode = process.waitFor()
+        if (exitCode != 0) {
+            val output1 = process.inputStream.bufferedReader().use { it.readText() }
+            println("Error $output1")
+            throw throw RuntimeException(output1)
+        }
+        return readWitness(output)
+    }
+
+    fun readWitness(witness: String = "witness"): List<String> {
+        return File(witness).readText().split("\n").filter { it.startsWith("~out_") }.sorted().map { it.split(' ')[1] }
+    }
+
+    fun setup(input: String = "out") {
+        val pb = ProcessBuilder(zokratesPath, "setup", "-i", input)
+        val process = pb.start()
+        val exitCode = process.waitFor()
+        if (exitCode != 0) {
+            val output = process.inputStream.bufferedReader().use { it.readText() }
+            println("Error $output")
+            throw RuntimeException(output)
+        }
+    }
+
+    fun generateProof(input: String = "out", witness: String = "witness", proof: String = "proof.json", scheme: ProvingScheme = ProvingScheme.G16) {
+        val ps =  if (scheme == ProvingScheme.G16) "g16" else "gm17"
+        val pb = ProcessBuilder(zokratesPath, "generate-proof", "-i", input, "-w", witness, "-j", proof,"-s",ps)
+        val process = pb.start()
+        val exitCode = process.waitFor()
+        if (exitCode != 0) {
+            val output = process.inputStream.bufferedReader().use { it.readText() }
+            println("Error $output")
+            throw RuntimeException(output)
+        }
+    }
+    fun verify() {
+        val pb = ProcessBuilder(zokratesPath, "verify")
+        val process = pb.start()
+        val exitCode = process.waitFor()
+        if (exitCode != 0) {
+            val output = process.inputStream.bufferedReader().use { it.readText() }
+            println("Error $output")
+            throw RuntimeException(output)
+        }
+    }
+
+
+    fun exportVerifier(input: String = "out", output: String = "verifier.sol") {
+        val pb = ProcessBuilder(zokratesPath, "export-verifier")
+        val process = pb.start()
+        val exitCode = process.waitFor()
+        if (exitCode != 0) {
+            val output = process.inputStream.bufferedReader().use { it.readText() }
+            println("Error $output")
+            throw RuntimeException(output)
+        }
+    }
+}