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/key_test.go

@@ -0,0 +1,108 @@
+package crypto
+
+import (
+	"bytes"
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/bin"
+)
+
+func TestAuthKeyID(t *testing.T) {
+	var k Key
+	for i := 0; i < 256; i++ {
+		k[i] = byte(i)
+	}
+
+	if k.ID() != [8]byte{50, 209, 88, 110, 164, 87, 223, 200} {
+		t.Error("bad id")
+	}
+	if k.AuxHash() != [8]byte{73, 22, 214, 189, 183, 247, 142, 104} {
+		t.Error("bad aux hash")
+	}
+}
+
+func TestCalcKey(t *testing.T) {
+	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)
+	}
+
+	t.Run("Client", func(t *testing.T) {
+		key, iv := Keys(k, m, Client)
+		if key != [32]byte{
+			112, 78, 208, 156, 139, 65, 102, 138, 232, 249, 157, 36, 71, 56, 247, 29,
+			189, 220, 68, 70, 155, 107, 189, 74, 168, 87, 61, 208, 66, 189, 5, 158,
+		} {
+			t.Error("bad key")
+		}
+		if iv != [32]byte{
+			77, 38, 96, 0, 165, 80, 237, 171, 191, 76, 124, 228, 15, 208, 4, 60, 201, 34, 48,
+			24, 76, 211, 23, 165, 204, 156, 36, 130, 253, 59, 147, 24,
+		} {
+			t.Error("bad iv")
+		}
+	})
+	t.Run("Server", func(t *testing.T) {
+		key, iv := Keys(k, m, Server)
+		if key != [32]byte{
+			33, 119, 37, 121, 155, 36, 88, 6, 69, 129, 116, 161, 252, 251, 200, 131, 144, 104,
+			7, 177, 80, 51, 253, 208, 234, 43, 77, 105, 207, 156, 54, 78,
+		} {
+			t.Error("bad key")
+		}
+		if iv != [32]byte{
+			102, 154, 101, 56, 145, 122, 79, 165, 108, 163, 35, 96, 164, 49, 201, 22, 11, 228,
+			173, 136, 113, 64, 152, 13, 171, 145, 206, 123, 220, 71, 255, 188,
+		} {
+			t.Error("bad iv")
+		}
+	})
+}
+
+func TestAuthKeyJSON(t *testing.T) {
+	a := require.New(t)
+	var k Key
+	for i := 0; i < 256; i++ {
+		k[i] = byte(i)
+	}
+	key := k.WithID()
+
+	var buf bytes.Buffer
+	a.NoError(json.NewEncoder(&buf).Encode(key))
+	var got AuthKey
+	a.NoError(json.NewDecoder(&buf).Decode(&got))
+
+	a.Equal(key, got)
+}
+
+func TestAuthKey_UnmarshalJSON(t *testing.T) {
+	tests := []struct {
+		name    string
+		data    string
+		want    AuthKey
+		wantErr bool
+	}{
+		{"BadValue", `{"value":1, "id":1}`, AuthKey{}, true},
+		{"BadID", `{"unknown": false, "value":"Cg==", "id":true}`, AuthKey{}, true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			a := require.New(t)
+			var key AuthKey
+			err := key.UnmarshalJSON([]byte(tt.data))
+			if tt.wantErr {
+				a.Error(err)
+			} else {
+				a.NoError(err)
+				a.Equal(tt.want, key)
+			}
+		})
+	}
+}