TnSb/VvmSmsReceiver
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decode passwords using XOR ciphering

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This commit is contained in:
Joel Beckmeyer 2024-06-21 12:31:58 -04:00
parent 76bd47869d
commit 3a9892b947
1 changed files with 38 additions and 2 deletions
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app/src/main/java/us/beckmeyer/vvmsmsreceiver/SmsReceiver.kt
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@ -3,20 +3,24 @@ package us.beckmeyer.vvmsmsreceiver
import android.content.BroadcastReceiver import android.content.BroadcastReceiver
import android.content.Context import android.content.Context
import android.content.Intent import android.content.Intent
import android.net.Uri
import android.os.Bundle import android.os.Bundle
import android.provider.Telephony import android.provider.Telephony
import android.telephony.SmsMessage import android.telephony.SmsMessage
import android.util.Log import android.util.Log
import kotlin.io.encoding.Base64
import kotlin.io.encoding.ExperimentalEncodingApi
class SmsReceiver : BroadcastReceiver() { class SmsReceiver : BroadcastReceiver() {
private val TAG = "SmsReceiver" private val TAG = "SmsReceiver"
@OptIn(ExperimentalStdlibApi::class) @OptIn(ExperimentalStdlibApi::class, ExperimentalEncodingApi::class)
override fun onReceive(context: Context, intent: Intent) { override fun onReceive(context: Context, intent: Intent) {
if (intent.action == Telephony.Sms.Intents.SMS_RECEIVED_ACTION || if (intent.action == Telephony.Sms.Intents.SMS_RECEIVED_ACTION ||
intent.action == Telephony.Sms.Intents.DATA_SMS_RECEIVED_ACTION) { intent.action == Telephony.Sms.Intents.DATA_SMS_RECEIVED_ACTION
) {
val bundle: Bundle? = intent.extras val bundle: Bundle? = intent.extras
bundle?.let { bundle?.let {
val pdus = bundle.get("pdus") as Array<ByteArray> val pdus = bundle.get("pdus") as Array<ByteArray>
@ -26,6 +30,13 @@ class SmsReceiver : BroadcastReceiver() {
smsMessage?.let { smsMessage?.let {
if (intent.action == Telephony.Sms.Intents.DATA_SMS_RECEIVED_ACTION) { if (intent.action == Telephony.Sms.Intents.DATA_SMS_RECEIVED_ACTION) {
Log.d(TAG, "Data SMS received on port 5499") Log.d(TAG, "Data SMS received on port 5499")
val bodyUri = Uri.parse("advvm://" + smsMessage.messageBody)
bodyUri.getQueryParameter("p")?.let { p ->
val ciphertext = Base64.decode(p).toString(Charsets.US_ASCII)
Log.d(TAG, "ciphertext = $ciphertext")
val password = decode(ciphertext, "8107308422")
Log.d(TAG, "password = $password")
}
} }
val messageBody = smsMessage.messageBody val messageBody = smsMessage.messageBody
Log.d(TAG, "Message body: $messageBody") Log.d(TAG, "Message body: $messageBody")
@ -36,4 +47,29 @@ class SmsReceiver : BroadcastReceiver() {
} }
} }
} }
private fun stripPrefix(char: Char): Int {
return char.code and 0x0F
}
private fun getStripped(text: String): ByteArray {
val stripped = text.map { stripPrefix(it).toByte() }
return stripped.toByteArray()
}
fun decode(cipher: String, phoneNumber: String): String {
val cipherStripped = getStripped(cipher)
val phoneNumberStripped = getStripped(phoneNumber)
val secret = byteArrayOf(12, 5, 3, 11, 9, 4, 5, 3, 8, 14)
val text = cipherStripped.zip(phoneNumberStripped)
.zip(secret.asIterable()) { (c, p), s -> (c.toInt() xor p.toInt() xor s.toInt()).toByte() }
.toMutableList()
if (cipherStripped.size > 10) {
text.addAll(cipherStripped.slice(10 until cipherStripped.size).toMutableList())
}
return text.toByteArray().map { (it + 0x30).toChar() }.joinToString("")
}
} }