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_test.go

@@ -0,0 +1,69 @@
+package crypto
+
+import (
+	"crypto/rand"
+	"io"
+	"testing"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/bin"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/testutil"
+)
+
+func genMessageAndAuthKeys() (Key, bin.Int128) {
+	var k Key
+	for i := 0; i < 256; i++ {
+		k[i] = byte(i)
+	}
+	var m bin.Int128
+	for i := 0; i < 16; i++ {
+		m[i] = byte(i)
+	}
+
+	return k, m
+}
+
+func BenchmarkKeys(b *testing.B) {
+	k, m := genMessageAndAuthKeys()
+
+	b.ReportAllocs()
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		_, _ = Keys(k, m, Client)
+	}
+}
+
+func TestKeys(t *testing.T) {
+	k, m := genMessageAndAuthKeys()
+
+	testutil.ZeroAlloc(t, func() {
+		_, _ = Keys(k, m, Client)
+	})
+}
+
+func BenchmarkMessageKey(b *testing.B) {
+	k, _ := genMessageAndAuthKeys()
+	payload := make([]byte, 1024)
+	if _, err := io.ReadFull(rand.Reader, payload); err != nil {
+		b.Error(err)
+	}
+
+	b.ReportAllocs()
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		_ = MessageKey(k, payload, Client)
+	}
+}
+
+func TestMessageKey(t *testing.T) {
+	k, _ := genMessageAndAuthKeys()
+	payload := make([]byte, 1024)
+	if _, err := io.ReadFull(rand.Reader, payload); err != nil {
+		t.Error(err)
+	}
+
+	testutil.ZeroAlloc(t, func() {
+		_ = MessageKey(k, payload, Client)
+	})
+}