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81 changes: 81 additions & 0 deletions
81
extractor/upcloud/src/main/kotlin/com/flixclusive/extractor/upcloud/util/DecryptHelper.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| package com.flixclusive.extractor.upcloud.util | ||
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| import android.graphics.Bitmap | ||
| import android.graphics.BitmapFactory | ||
| import android.util.Base64 | ||
| import com.flixclusive.core.util.network.CryptographyUtil | ||
| import java.io.InputStream | ||
|
|
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| fun getKey(responseBodyStream: InputStream): String { | ||
| val bitmap = BitmapFactory.decodeStream(responseBodyStream) | ||
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| val rgba = bitmapToRgba(bitmap) | ||
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| val binary = extractBitsFromImage(rgba) | ||
| val hexCompiledString = binaryToASCII(binary) | ||
| val keys = convertHexToIntegers(hexCompiledString) | ||
|
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| return encodeIntegersToBase64(keys) | ||
| } | ||
|
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| private fun bitmapToRgba(bitmap: Bitmap): ByteArray { | ||
| require(bitmap.config == Bitmap.Config.ARGB_8888) { "Bitmap must be in ARGB_8888 format" } | ||
| val pixels = IntArray(bitmap.width * bitmap.height) | ||
| val bytes = ByteArray(pixels.size * 4) | ||
| bitmap.getPixels(pixels, 0, bitmap.width, 0, 0, bitmap.width, bitmap.height) | ||
| var i = 0 | ||
| for (pixel in pixels) { | ||
| // Get components assuming is ARGB | ||
| val A = pixel shr 24 and 0xff | ||
| val R = pixel shr 16 and 0xff | ||
| val G = pixel shr 8 and 0xff | ||
| val B = pixel and 0xff | ||
| bytes[i++] = R.toByte() | ||
| bytes[i++] = G.toByte() | ||
| bytes[i++] = B.toByte() | ||
| bytes[i++] = A.toByte() | ||
| } | ||
| return bytes | ||
| } | ||
|
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| private fun extractBitsFromImage(imageData: ByteArray): String { | ||
| val i = 8 * imageData[3] | ||
| val stringBuilder = StringBuilder() | ||
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| for (j in 0 until i) { | ||
| stringBuilder.append(imageData[4 * (j + 1) + 3] % 2) | ||
| } | ||
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| return stringBuilder.toString() | ||
| } | ||
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| private fun binaryToASCII(string: String): String { | ||
| val chunks = string.chunked(8) // Splits the string into chunks of 8 characters | ||
| val asciiChars = chunks.map { chunk -> chunk.toInt(2).toChar() } // Converts each chunk from binary to decimal and then to its corresponding ASCII character | ||
| return asciiChars.joinToString("") // Joins the ASCII characters into a single string | ||
| } | ||
|
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| private fun convertHexToIntegers(hexString: String): List<Int> { | ||
| val keys = mutableListOf<Int>() | ||
| var i = 0 | ||
| while (i < hexString.length) { | ||
| // Convert each pair of hexadecimal characters into an integer | ||
| val hexPair = hexString.substring(i, i + 2) | ||
| keys.add(hexPair.toInt(16)) | ||
| i += 2 | ||
| } | ||
| return keys | ||
| } | ||
|
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| private fun encodeIntegersToBase64(keys: List<Int>): String { | ||
| val keyBytes = keys.toByteArray() | ||
| return CryptographyUtil.base64Encode(keyBytes, Base64.NO_WRAP) // Encode the bytes to base64 | ||
| } | ||
|
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| private fun List<Int>.toByteArray(): ByteArray { | ||
| val result = ByteArray(size) | ||
| for (i in indices) { | ||
| result[i] = get(i).toByte() | ||
| } | ||
| return result | ||
| } |
61 changes: 0 additions & 61 deletions
61
extractor/upcloud/src/main/kotlin/com/flixclusive/extractor/upcloud/util/DecryptUtils.kt
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