From 1702b10d2797fbfec3a703e25f98fa0076a628f8 Mon Sep 17 00:00:00 2001
From: k0rrluna <k0rr.luna1@gmail.com>
Date: Sun, 16 Feb 2025 20:33:56 +0300
Subject: [PATCH] cryptopals

---
 cryptopals/set1/challenge1/hexToBase64.java   | 22 +++++++++++++
 cryptopals/set1/challenge2/fixedXor.java      | 32 +++++++++++++++++++
 .../set1/challenge3/singleByteXORCipher.java  | 25 +++++++++++++++
 3 files changed, 79 insertions(+)
 create mode 100644 cryptopals/set1/challenge1/hexToBase64.java
 create mode 100644 cryptopals/set1/challenge2/fixedXor.java
 create mode 100644 cryptopals/set1/challenge3/singleByteXORCipher.java

diff --git a/cryptopals/set1/challenge1/hexToBase64.java b/cryptopals/set1/challenge1/hexToBase64.java
new file mode 100644
index 0000000..13c78d9
--- /dev/null
+++ b/cryptopals/set1/challenge1/hexToBase64.java
@@ -0,0 +1,22 @@
+import java.util.Base64;
+import java.util.HexFormat;
+import java.util.Scanner;
+
+public class hexToBase64 {
+    public static void main(String[] args) {
+        HexFormat hex = HexFormat.of();
+        Scanner scan = new Scanner(System.in);
+
+
+        System.out.println("Enter hex!");
+        String hexString = scan.next();
+        byte[] byteString = HexFormat.of().parseHex(hexString);
+        String convertedHex = Base64.getEncoder().encodeToString(byteString);
+        scan.close();
+
+
+
+        System.out.println(convertedHex);
+    }
+
+}
diff --git a/cryptopals/set1/challenge2/fixedXor.java b/cryptopals/set1/challenge2/fixedXor.java
new file mode 100644
index 0000000..06a19c9
--- /dev/null
+++ b/cryptopals/set1/challenge2/fixedXor.java
@@ -0,0 +1,32 @@
+import java.util.Scanner;
+import java.util.HexFormat;
+
+public class fixedXor {
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+        System.out.println("Enter byte string!");
+        String byte1 = scan.next();
+        String byte2 = scan.next();
+
+
+        System.out.println(HexFormat.of().formatHex(fixedXOR(byte1, byte2)));
+
+    }
+
+public static byte[] fixedXOR(String byte1, String byte2) {
+    byte[] byteS1 = HexFormat.of().parseHex(byte1);
+    byte[] byteS2 = HexFormat.of().parseHex(byte2);
+
+if (byteS1.length != byteS2.length) {
+        throw new IllegalArgumentException("Not same!");
+}
+
+byte[] result = byteS1;
+for (int t = 0; t < byteS1.length; t++) {
+    result[t] = (byte) (byteS1[t] ^ byteS2[t]);
+
+}
+    return result;
+}
+
+}
diff --git a/cryptopals/set1/challenge3/singleByteXORCipher.java b/cryptopals/set1/challenge3/singleByteXORCipher.java
new file mode 100644
index 0000000..753a50d
--- /dev/null
+++ b/cryptopals/set1/challenge3/singleByteXORCipher.java
@@ -0,0 +1,25 @@
+import java.util.HexFormat;
+
+
+public class singleByteXORCipher {
+    public static void main(String[] args) {
+    String hexS = "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736";
+    byte[] byteS = HexFormat.of().parseHex(hexS);
+
+int i = 0;
+String crypted = "";
+int t = 0;
+byte max = 0x00;
+
+    for(byte b = 0x00; b <= 0xFF; b++){
+        String Tcrypted = "";
+        for(int a = 0; a < hexS.length; a++) {
+            Tcrypted = (byte) (b ^ hexS[a]);
+        }
+
+}
+
+
+    }
+
+}