feat: Frame Cryptor (aes gcm/cbc). (#54)

* feat: add frame crypto transformer using aes-128/256-gcm.

* update.

* feat: add aes-cbc.

* update.

* fix compile.

* update.

* chore: add getIvSize().

* rename.

* update.

* Add ObjC API for framecryptor.

* add FrameCryptor interfaces for android.

* chore: add jni native code.

* update.

* update

* fix compile for iOS.

* update.

* fix.

* update.

* Add cryptor_id.

* update.

* update.

* update.

* update.

* chore: Experimental encryption for h.264.

* chore: export class FrameCryptorTransformer.

* aes frame crypto for h.264.

* chore: add decrypto failed callback.

* fix: Fix FrameTransformer work with simulcast.

* revert changes.

* Fix h264 screen freezing in frame encryption.

* chore: Improve the code and add FrameCryptionError.

* feat: Add RTCFrameCryptorDelegate for darwin.

* WIP observer for android.

* observer for android.

* Add kNew/kOk state.

* [objc] fix bug for state callack.

* fix issue for re-RegisterFrameTransformer.

* dispose.

* Update sdk/objc/api/peerconnection/RTCFrameCryptorKeyManager.mm

Co-authored-by: Théo Monnom <[email protected]>

* Update sdk/android/src/jni/pc/frame_cryptor_key_manager.h

Co-authored-by: Théo Monnom <[email protected]>

* Update sdk/objc/api/peerconnection/RTCFrameCryptorKeyManager.mm

Co-authored-by: Théo Monnom <[email protected]>

* update.

* fix compile.

---------

Co-authored-by: Théo Monnom <[email protected]>

Author: cloudwebrtc

api/crypto/BUILD.gn

@@ -16,6 +16,24 @@ group("crypto") {
   ]
 }
 
+rtc_library("frame_crypto_transformer") {
+  visibility = [ "*" ]
+  sources = [
+    "frame_crypto_transformer.cc",
+    "frame_crypto_transformer.h",
+  ]
+
+  deps = [
+   "//api:frame_transformer_interface",
+  ]
+
+  if (rtc_build_ssl) {
+    deps += [ "//third_party/boringssl" ]
+  } else {
+    configs += [ ":external_ssl_library" ]
+  }
+}
+
 rtc_library("options") {
   visibility = [ "*" ]
   sources = [