From f4974c8705bc6c05bcda567e2c954670d05c7df0 Mon Sep 17 00:00:00 2001 From: Christopher O'Grady Date: Wed, 8 Jan 2025 21:01:37 -0500 Subject: [PATCH] Import APK in tests --- .gitignore | 4 ++ .../vbhelper/source/ApkSecretsImporter.kt | 25 +++++++++ .../vbhelper/source/DexFileSecretsImporter.kt | 51 +++++++++++++++++++ .../nacabaro/vbhelper/source/Secrets.kt | 9 ++++ .../vbhelper/source/ApkSecretsImporterTest.kt | 34 +++++++++++++ .../source/DexFileSecretsImporterTest.kt | 34 +++++++++++++ 6 files changed, 157 insertions(+) create mode 100644 app/src/main/java/com/github/nacabaro/vbhelper/source/ApkSecretsImporter.kt create mode 100644 app/src/main/java/com/github/nacabaro/vbhelper/source/DexFileSecretsImporter.kt create mode 100644 app/src/main/java/com/github/nacabaro/vbhelper/source/Secrets.kt create mode 100644 app/src/test/java/com/github/nacabaro/vbhelper/source/ApkSecretsImporterTest.kt create mode 100644 app/src/test/java/com/github/nacabaro/vbhelper/source/DexFileSecretsImporterTest.kt diff --git a/.gitignore b/.gitignore index 3017dac..d8d1c1d 100644 --- a/.gitignore +++ b/.gitignore @@ -6,3 +6,7 @@ local.properties app/src/main/res/values/keys.xml + +app/src/test/resources/com/github/nacabaro/vbhelper/source/com.bandai.vitalbraceletarena.apk + +app/src/test/resources/com/github/nacabaro/vbhelper/source/classes.dex diff --git a/app/src/main/java/com/github/nacabaro/vbhelper/source/ApkSecretsImporter.kt b/app/src/main/java/com/github/nacabaro/vbhelper/source/ApkSecretsImporter.kt new file mode 100644 index 0000000..f2bbb1e --- /dev/null +++ b/app/src/main/java/com/github/nacabaro/vbhelper/source/ApkSecretsImporter.kt @@ -0,0 +1,25 @@ +package com.github.nacabaro.vbhelper.source + +import java.io.InputStream +import java.util.zip.ZipInputStream + +class ApkSecretsImporter(private val dexFileSecretsImporter: DexFileSecretsImporter = DexFileSecretsImporter()) { + + companion object { + const val DEX_FILE = "classes.dex" + } + + fun importSecrets(inputStream: InputStream): Map { + ZipInputStream(inputStream).use { zip -> + var zipEntry = zip.nextEntry + while(zipEntry != null) { + println("Zip Entry: ${zipEntry.name}") + if(zipEntry.name == DEX_FILE) { + return dexFileSecretsImporter.importSecrets(zip) + } + zipEntry = zip.nextEntry + } + throw IllegalArgumentException("File `$DEX_FILE` is missing from apk!") + } + } +} diff --git a/app/src/main/java/com/github/nacabaro/vbhelper/source/DexFileSecretsImporter.kt b/app/src/main/java/com/github/nacabaro/vbhelper/source/DexFileSecretsImporter.kt new file mode 100644 index 0000000..b37211d --- /dev/null +++ b/app/src/main/java/com/github/nacabaro/vbhelper/source/DexFileSecretsImporter.kt @@ -0,0 +1,51 @@ +package com.github.nacabaro.vbhelper.source + +import com.github.cfogrady.vbnfc.data.DeviceType +import java.io.InputStream +import java.nio.ByteBuffer +import java.nio.ByteOrder +import java.nio.charset.StandardCharsets + + +class DexFileSecretsImporter { + companion object { + + const val VBDM_SUBSTITUTION_CIPHER_IDX = 1080145 + const val BE_SUBSTITUTION_CIPHER_IDX = 1080217 + + const val VBDM_HMAC_KEY_2_IDX = 1249063 + const val VBDM_HMAC_KEY_1_IDX = 1494074 + const val VBC_HMAC_KEY_1_IDX = 1241640 + const val VBC_HMAC_KEY_2_IDX = 1466955 + const val BE_HMAC_KEY_1_IDX = 1580157 + const val BE_HMAC_KEY_2_IDX = 1593759 + const val AES_KEY_IDX = 1277527 + } + + fun importSecrets(inputStream: InputStream): Map { + val dexFile = inputStream.readBytes() + val byteOrder = ByteOrder.BIG_ENDIAN + val vbdmSubstitutionCipher = dexFile.sliceArray(VBDM_SUBSTITUTION_CIPHER_IDX until VBDM_SUBSTITUTION_CIPHER_IDX+(16*4)).toIntArray(byteOrder) + val beSubstitutionCipher = dexFile.sliceArray(BE_SUBSTITUTION_CIPHER_IDX until BE_SUBSTITUTION_CIPHER_IDX+(16*4)).toIntArray(byteOrder) + val aesKey = dexFile.sliceArray(AES_KEY_IDX until AES_KEY_IDX+24).toString(StandardCharsets.UTF_8) + val cryptographicTransformerByDevices = mapOf( + Pair(DeviceType.VitalSeriesDeviceType, buildSecrets(dexFile, VBDM_HMAC_KEY_1_IDX, VBDM_HMAC_KEY_2_IDX, aesKey, vbdmSubstitutionCipher)), + Pair(DeviceType.VitalBraceletBEDeviceType, buildSecrets(dexFile, BE_HMAC_KEY_1_IDX, BE_HMAC_KEY_2_IDX, aesKey, beSubstitutionCipher)), + Pair(DeviceType.VitalCharactersDeviceType, buildSecrets(dexFile, VBC_HMAC_KEY_1_IDX, VBC_HMAC_KEY_2_IDX, aesKey, vbdmSubstitutionCipher)), + ) + return cryptographicTransformerByDevices + } + + private fun buildSecrets(dexFile: ByteArray, hmacKeyIdx1: Int, hmacKeyIdx2: Int, aesKey: String, substitutionCipher: IntArray): Secrets { + val hmacKey1 = dexFile.sliceArray(hmacKeyIdx1 until hmacKeyIdx1+24).toString(StandardCharsets.UTF_8) + val hmacKey2 = dexFile.sliceArray(hmacKeyIdx2 until hmacKeyIdx2+24).toString(StandardCharsets.UTF_8) + return Secrets(hmacKey1, hmacKey2, aesKey, substitutionCipher) + } +} + +fun ByteArray.toIntArray(byteOrder: ByteOrder): IntArray { + require(this.size % 4 == 0) { "Number of bytes must be multiple of 4 to convert into 32-bit words" } + val values = IntArray(this.size / 4) + ByteBuffer.wrap(this).order(byteOrder).asIntBuffer()[values] + return values +} \ No newline at end of file diff --git a/app/src/main/java/com/github/nacabaro/vbhelper/source/Secrets.kt b/app/src/main/java/com/github/nacabaro/vbhelper/source/Secrets.kt new file mode 100644 index 0000000..485a670 --- /dev/null +++ b/app/src/main/java/com/github/nacabaro/vbhelper/source/Secrets.kt @@ -0,0 +1,9 @@ +package com.github.nacabaro.vbhelper.source + +import com.github.cfogrady.vbnfc.CryptographicTransformer + +data class Secrets(val hmacKey1: String, val hmacKey2: String, val aesKey: String, val substitutionCipher: IntArray) { + fun toCryptographicTransformer(): CryptographicTransformer { + return CryptographicTransformer(hmacKey1, hmacKey2, aesKey, substitutionCipher) + } +} diff --git a/app/src/test/java/com/github/nacabaro/vbhelper/source/ApkSecretsImporterTest.kt b/app/src/test/java/com/github/nacabaro/vbhelper/source/ApkSecretsImporterTest.kt new file mode 100644 index 0000000..d191753 --- /dev/null +++ b/app/src/test/java/com/github/nacabaro/vbhelper/source/ApkSecretsImporterTest.kt @@ -0,0 +1,34 @@ +package com.github.nacabaro.vbhelper.source + +import com.github.cfogrady.vbnfc.data.DeviceType +import org.junit.Assert +import org.junit.Test +import java.io.File + +class ApkSecretsImporterTest { + + @OptIn(ExperimentalStdlibApi::class) + @Test + fun importSecretsTest() { + val apkSecretsImporter = ApkSecretsImporter() + val url = javaClass.getResource("com.bandai.vitalbraceletarena.apk") + if(url == null) { + Assert.assertTrue(""" + Create `resources\com\github\nacabaro\vbhelper\source` within the src/test directory. + Add com.bandai.vitalbraceletarena.apk (the official apk) in the above directory. It + should never be checked in and should be on the .gitignore. + """.trimIndent(), false) + } + val file = File(url.path) + val testTagId = byteArrayOf(0x04, 0x40, 0xaf.toByte(), 0xa2.toByte(), 0xee.toByte(), 0x0f, 0x90.toByte()) + file.inputStream().use { + val deviceIdToCryptographicTransformer = apkSecretsImporter.importSecrets(it) + var password = deviceIdToCryptographicTransformer[DeviceType.VitalBraceletBEDeviceType]!!.toCryptographicTransformer().createNfcPassword(testTagId) + Assert.assertEquals("5651b1c8", password.toHexString()) + password = deviceIdToCryptographicTransformer[DeviceType.VitalSeriesDeviceType]!!.toCryptographicTransformer().createNfcPassword(testTagId) + Assert.assertEquals("dd2ceb84", password.toHexString()) + password = deviceIdToCryptographicTransformer[DeviceType.VitalCharactersDeviceType]!!.toCryptographicTransformer().createNfcPassword(testTagId) + Assert.assertEquals("515e0c12", password.toHexString()) + } + } +} \ No newline at end of file diff --git a/app/src/test/java/com/github/nacabaro/vbhelper/source/DexFileSecretsImporterTest.kt b/app/src/test/java/com/github/nacabaro/vbhelper/source/DexFileSecretsImporterTest.kt new file mode 100644 index 0000000..5511f47 --- /dev/null +++ b/app/src/test/java/com/github/nacabaro/vbhelper/source/DexFileSecretsImporterTest.kt @@ -0,0 +1,34 @@ +package com.github.nacabaro.vbhelper.source + +import com.github.cfogrady.vbnfc.data.DeviceType +import org.junit.Assert +import org.junit.Test +import java.io.File + + +class DexFileSecretsImporterTest { + @OptIn(ExperimentalStdlibApi::class) + @Test + fun importSecretsTest() { + val dexFileSecretsImporter = DexFileSecretsImporter() + val url = javaClass.getResource("classes.dex") + if(url == null) { + Assert.assertTrue(""" + Create `resources\com\github\nacabaro\vbhelper\source` within the src/test directory. + Add classes.dex from the official apk in the above directory. It should never be + checked in and should be on the .gitignore. + """.trimIndent(), false) + } + val file = File(url.path) + val testTagId = byteArrayOf(0x04, 0x40, 0xaf.toByte(), 0xa2.toByte(), 0xee.toByte(), 0x0f, 0x90.toByte()) + file.inputStream().use { + val deviceIdToCryptographicTransformer = dexFileSecretsImporter.importSecrets(it) + var password = deviceIdToCryptographicTransformer[DeviceType.VitalBraceletBEDeviceType]!!.toCryptographicTransformer().createNfcPassword(testTagId) + Assert.assertEquals("5651b1c8", password.toHexString()) + password = deviceIdToCryptographicTransformer[DeviceType.VitalSeriesDeviceType]!!.toCryptographicTransformer().createNfcPassword(testTagId) + Assert.assertEquals("dd2ceb84", password.toHexString()) + password = deviceIdToCryptographicTransformer[DeviceType.VitalCharactersDeviceType]!!.toCryptographicTransformer().createNfcPassword(testTagId) + Assert.assertEquals("515e0c12", password.toHexString()) + } + } +} \ No newline at end of file