move gotd fork into repo. (#111)

- update to latest telegram layer
- remove some references to fields in tg.Entities that don't exist in
the schema
- originally added here:
https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e
  - referenced here
-
https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3
-
https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e

pkg/gotd/crypto/keys_old_test.go

@@ -0,0 +1,45 @@
+package crypto
+
+import (
+	"bytes"
+	"crypto/aes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/gotd/ige"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/bin"
+)
+
+func TestOldKeys(t *testing.T) {
+	a := require.New(t)
+	var (
+		authKey Key
+		msgKey  bin.Int128
+	)
+	for i := range authKey {
+		authKey[i] = byte(i)
+	}
+	for i := range msgKey {
+		msgKey[i] = byte(i)
+	}
+
+	data := bytes.Repeat([]byte("aboba"), 16)
+	encrypted := make([]byte, len(data))
+	{
+		key, iv := OldKeys(authKey, msgKey, Server)
+		a.Equal(key, bin.Int256{
+			0xbb, 0x17, 0xb0, 0x7e, 0xb9, 0x11, 0x10, 0x64, 0x70, 0x98, 0xb0, 0x69, 0xbd, 0x1a, 0x9b, 0x6f,
+			0xe5, 0xc4, 0xbc, 0xc3, 0xc3, 0x1f, 0x8e, 0x67, 0xe8, 0x31, 0xd0, 0x7a, 0x61, 0x08, 0x5f, 0x68,
+		})
+		a.Equal(iv, bin.Int256{
+			0x51, 0x97, 0xfc, 0x1e, 0x25, 0xb4, 0x1f, 0xe3, 0x6f, 0x18, 0xb5, 0xa3, 0xa8, 0xb2, 0xb3, 0x6c,
+			0xb2, 0xcb, 0x06, 0x1f, 0x1f, 0x15, 0x7b, 0x35, 0x14, 0xfe, 0x42, 0xe7, 0x4f, 0xb5, 0x83, 0x59,
+		})
+
+		block, err := aes.NewCipher(key[:])
+		a.NoError(err)
+		ige.EncryptBlocks(block, iv[:], encrypted, data)
+	}
+}