Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/TelegramCore/Sources/SecretChats/SecretChatEncryptionConfig.swift

@@ -0,0 +1,34 @@
+import Foundation
+import Postbox
+import SwiftSignalKit
+import TelegramApi
+import MtProtoKit
+
+
+func validatedEncryptionConfig(postbox: Postbox, network: Network) -> Signal<SecretChatEncryptionConfig, NoError> {
+    return network.request(Api.functions.messages.getDhConfig(version: 0, randomLength: 0))
+    |> retryRequest
+    |> mapToSignal { result -> Signal<SecretChatEncryptionConfig, NoError> in
+        switch result {
+            case let .dhConfig(g, p, version, _):
+                if !MTCheckIsSafeG(UInt32(g)) {
+                    Logger.shared.log("SecretChatEncryptionConfig", "Invalid g")
+                    return .complete()
+                }
+                
+                if !MTCheckMod(network.encryptionProvider, p.makeData(), UInt32(g), network.context.keychain) {
+                    Logger.shared.log("SecretChatEncryptionConfig", "Invalid p or g")
+                    return .complete()
+                }
+                
+                if !MTCheckIsSafePrime(network.encryptionProvider, p.makeData(), network.context.keychain) {
+                    Logger.shared.log("SecretChatEncryptionConfig", "Invalid p")
+                    return .never()
+                }
+                return .single(SecretChatEncryptionConfig(g: g, p: MemoryBuffer(p), version: version))
+            case .dhConfigNotModified(_):
+                assertionFailure()
+                return .never()
+        }
+    }
+}