bruteforce

BruteForce/.gitignore

+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
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BruteForce/.idea/.gitignore

+# Default ignored files
+/shelf/
+/workspace.xml

BruteForce/.idea/libraries/byteLib.xml

+<component name="libraryTable">
+  <library name="byteLib">
+    <CLASSES>
+      <root url="jar://$PROJECT_DIR$/../byteLib.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$PROJECT_DIR$/../byteLib.jar!/doc" />
+    </JAVADOC>
+    <SOURCES />
+  </library>
+</component>
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BruteForce/.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="21" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
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BruteForce/.idea/modules.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/BruteForce.iml" filepath="$PROJECT_DIR$/BruteForce.iml" />
+    </modules>
+  </component>
+</project>
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BruteForce/BruteForce.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="byteLib" level="project" />
+  </component>
+</module>
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BruteForce/OTP-3

+F
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BruteForce/keystr-1x3

+.(?
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BruteForce/src/BruteForce.java

+import it.uniupo.byteLib.BitStringGenerator;
+import it.uniupo.byteLib.NonPrintableCharactersException;
+import it.uniupo.byteLib.Tools;
+
+import java.util.Arrays;
+
+public class BruteForce {
+    public static void main(String[] args) throws NonPrintableCharactersException {
+        {
+            System.out.println("OTP-3");
+            var c = Tools.readByteFlow("OTP-3");
+            bruteforce(c, 3);
+        }
+        {
+            System.out.println("keystr-1x3");
+            var c = Tools.readByteFlow("keystr-1x3");
+            bruteforce(c, 1);
+        }
+    }
+
+    private static void bruteforce(byte[] c, int n) throws NonPrintableCharactersException {
+        var bsGen = new BitStringGenerator(n);
+        bsGen.zeroInit();
+        while (!bsGen.isMax()) {
+            var repetition = bsGen.nextVal();
+            var key = Arrays.copyOf(repetition, n);
+            for (int i = repetition.length - 1; i < n; i++) {
+                key[i] = repetition[i % repetition.length];
+            }
+            var attempt = Xor.xorCipher(c, key);
+            if (Tools.isUText(attempt)) {
+                System.out.println(Tools.bytesToString(attempt));
+            }
+        }
+    }
+}

BruteForce/src/Xor.java

+public class Xor {
+    public static byte[] xorCipher(byte[] c, byte[] k) {
+        byte[] ret = c.clone();
+        for (int i = 0; i < c.length; ++i) {
+            ret[i] ^= k[i % k.length];
+        }
+        return ret;
+    }
+}