From db14c11d0bba71e2a150119887946c162f2131a5 Mon Sep 17 00:00:00 2001
From: stulle123 <stulle>
Date: Wed, 6 Sep 2023 21:09:33 +0200
Subject: [PATCH] Add Java script to generate Kakao nonce

---
 scripts/mitmproxy/lib/ComputeKakaoNonce.java | 153 +++++++++++++++++++
 1 file changed, 153 insertions(+)
 create mode 100644 scripts/mitmproxy/lib/ComputeKakaoNonce.java

diff --git a/scripts/mitmproxy/lib/ComputeKakaoNonce.java b/scripts/mitmproxy/lib/ComputeKakaoNonce.java
new file mode 100644
index 0000000..d4c8eec
--- /dev/null
+++ b/scripts/mitmproxy/lib/ComputeKakaoNonce.java
@@ -0,0 +1,153 @@
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.security.spec.InvalidKeySpecException;
+import javax.crypto.Mac;
+import javax.crypto.SecretKey;
+import javax.crypto.SecretKeyFactory;
+import javax.crypto.spec.PBEKeySpec;
+import javax.crypto.spec.SecretKeySpec;
+import java.nio.charset.Charset;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+
+public final class ComputeKakaoNonce {
+    public static final byte[] byte_juggling_1(int i, int i2, byte[] bArr) {
+        boolean z;
+        if (i <= i2) {
+            z = true;
+        } else {
+            z = false;
+        }
+        if (z) {
+            int length = bArr.length;
+            if (i >= 0 && i <= length) {
+                int i3 = i2 - i;
+                int i4 = length - i;
+                if (i3 <= i4) {
+                    i4 = i3;
+                }
+                byte[] bArr2 = new byte[i3];
+                System.arraycopy(bArr, i, bArr2, 0, i4);
+                return bArr2;
+            }
+            throw new ArrayIndexOutOfBoundsException();
+        }
+        throw new IllegalArgumentException("Failed requirement.".toString());
+    }
+
+    public static final byte[] byte_juggling_2(byte[][] bArr, byte[] bArr2) {
+        int length = bArr2.length;
+        for (byte[] bArr3 : bArr) {
+            length += bArr3.length;
+        }
+        byte[] bArr4 = new byte[length];
+        int length2 = bArr2.length;
+        System.arraycopy(bArr2, 0, bArr4, 0, length2);
+        for (byte[] bArr5 : bArr) {
+            System.arraycopy(bArr5, 0, bArr4, length2, bArr5.length);
+            length2 += bArr5.length;
+        }
+        return bArr4;
+    }    
+
+    public static final byte[] compute_iv(String secret, byte[] bArr, int i, PBEKeySpec pBEKeySpec) throws InvalidKeyException, InvalidKeySpecException, NoSuchAlgorithmException {
+        SecretKey generateSecret = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1").generateSecret(pBEKeySpec);
+        byte[] k = generateSecret.getEncoded();
+        int i2 = 0;
+        int length = k.length - 32;
+        if (length <= 0) {
+            length = 0;
+        }
+        byte[] m26958p2 = byte_juggling_1(length, k.length, k);
+        System.out.println("First MAC key: " + print(m26958p2));
+
+
+        Charset charset = Charset.forName("UTF-8");
+        byte[] bytes = secret.getBytes(charset);
+        Mac mac = Mac.getInstance("HmacSHA256");
+        mac.init(new SecretKeySpec(m26958p2, "HmacSHA256"));
+        mac.update(bytes);
+        byte[] doFinal = mac.doFinal();
+        mac.reset();
+        Mac mac2 = Mac.getInstance("HmacSHA256");
+        mac2.init(new SecretKeySpec(doFinal, "HmacSHA256"));
+        System.out.println("New MAC key: " + print(doFinal));
+        byte[] bArr2 = new byte[0];
+        byte[] bArr3 = new byte[0];
+        int i3 = 40;
+        int ceil = (int) Math.ceil(40 / 32);
+        byte[] input = new byte[0];
+
+        int i4 = 0;
+        while (i4 < ceil) {
+            byte[][] bArr4 = new byte[2][];
+            bArr4[i2] = bArr;
+            i4++;
+            String hexString = Integer.toHexString(i4);
+            if (hexString.length() % 2 == 1) {
+                hexString = "0".concat(hexString);
+            }
+            int length2 = hexString.length() / 2;
+            byte[] bArr5 = new byte[length2];
+            for (int i5 = i2; i5 < length2; i5++) {
+                int i6 = i5 * 2;
+                String substring = hexString.substring(i6, i6 + 2);
+                bArr5[i5] = (byte) Integer.parseInt(substring, 16);
+            }
+            bArr4[1] = bArr5;
+            input = byte_juggling_2(bArr4, bArr3);
+            System.out.println("MAC input: " + print(input));
+            mac2.update(input);
+            bArr3 = mac2.doFinal();
+            System.out.println("MAC: " + print(bArr3));
+
+            mac2.reset();
+            bArr2 = byte_juggling_2(new byte[][]{bArr3}, bArr2);
+            i2 = 0;
+            i3 = 40;
+        }
+        int i7 = i3;
+        int i8 = i2;
+        byte[] m26958p3 = byte_juggling_1(i8, i7, bArr2);
+        byte[] bArr6 = new byte[16];
+        System.arraycopy(m26958p3, i8, bArr6, i8, i);
+        return bArr6;
+    }
+
+    public static String print(byte[] bytes) {
+        StringBuilder sb = new StringBuilder();
+        sb.append("[ ");
+        for (byte b : bytes) {
+            sb.append(String.format("0x%02X ", b));
+        }
+        sb.append("]");
+        return sb.toString();
+    }    
+
+    public static void main(String[] args) {        
+        String masterKey = "AAAAAAAAAAAAAAAAAAAAAA==";
+        long messageID = 1603192701;
+        byte[] iv = new byte[0];
+
+        Charset charset = Charset.forName("UTF-8");
+        byte[] bytes = "53656372657443686174526f6f6d4b6579".getBytes(charset);
+        byte[] bytes2 = "4d6573736167654e6f6e6365486d6163".getBytes(charset);
+        char[] charArray = masterKey.toCharArray();
+
+        PBEKeySpec pBEKeySpec = new PBEKeySpec(charArray, bytes, 2048, 512);
+        byte[] bArr = new byte[bytes2.length + 8];
+        ByteBuffer wrap = ByteBuffer.wrap(bArr);
+        wrap.put(bytes2, 0, bytes2.length);
+        wrap.order(ByteOrder.LITTLE_ENDIAN).putLong(messageID);
+
+
+        try {
+            iv = compute_iv(masterKey, bArr, 8, pBEKeySpec);
+        } catch (Exception e) {
+            System.out.println("Exception");
+        }
+
+        System.out.println("Nonce: " + print(iv));
+    }
+}
\ No newline at end of file