temporal state (currently tools for files decryption in JS do work

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/utils/passport/DecryptionContext.kt

@@ -0,0 +1,25 @@
+package dev.inmo.tgbotapi.utils.passport
+
+import dev.inmo.tgbotapi.bot.TelegramBot
+import dev.inmo.tgbotapi.requests.DownloadFile
+import dev.inmo.tgbotapi.requests.get.GetFile
+import dev.inmo.tgbotapi.types.passport.encrypted_data.PassportFile
+
+expect class DecryptionContext(
+    key: String
+) {
+    fun ByteArray.decrypt(): ByteArray
+}
+
+suspend fun DecryptionContext.decrypt(
+    file: PassportFile,
+    bot: TelegramBot
+): ByteArray {
+    return bot.execute(
+        DownloadFile(
+            bot.execute(
+                GetFile(file.fileId)
+            ).filePath
+        )
+    ).decrypt()
+}