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/srp/srp_test.go

@@ -0,0 +1,122 @@
+package srp
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"encoding/binary"
+	"encoding/hex"
+	"fmt"
+	"math/big"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type srpArgs struct {
+	password []byte
+	srpB     []byte
+	mp       Input
+}
+
+func testSRPInput(t testing.TB) srpArgs {
+	return srpArgs{
+		password: []byte("123123"),
+		srpB: getHex(t, "9C52401A6A8084EC82F01C3725D3FB448BD2F0C909F9D97726EAC4B7A74172D9"+
+			"52F02466BE6734FA274D2B7429E27397F10372D66B400B80A5C5AE3F28B17BF3"+
+			"105D7A2D2A885998CDC2DEFC208AEC217AB58859A9ABC2374AD93DC285F4B3FB"+
+			"CAFF4143D7888F2425BD2FB711B25609CEB21757D935B1EF2F042173AD0CE2FE"+
+			"0E474DAC53914BD25A8A9AED4AEA8953D55CB88621DB37B871EA0D04393AC098"+
+			"7F68094CCC9DE8239251375D8FFFD263316CD528C097B7BC9FB919FBEDB76C52"+
+			"5DF3413C374EE076D97A1E6D352BB7CC80FD13651B04B32E2E48C5268150842C"+
+			"FD07CF855958B1B5EA9C36FDAD697FE3AEC8DCC6B1EFEC36874AF226204676CF"),
+		mp: Input{
+			Salt1: getHex(t, "4D11FB6BEC38F9D2546BB0F61E4F1C99A1BC0DB8F0D5F35B1291B37B213123D7ED48F3C6794D495B"),
+			Salt2: getHex(t, "A1B181AAFE88188680AE32860D60BB01"),
+			G:     3,
+			P: getHex(t, "C71CAEB9C6B1C9048E6C522F70F13F73980D40238E3E21C14934D037563D930F"+
+				"48198A0AA7C14058229493D22530F4DBFA336F6E0AC925139543AED44CCE7C37"+
+				"20FD51F69458705AC68CD4FE6B6B13ABDC9746512969328454F18FAF8C595F64"+
+				"2477FE96BB2A941D5BCD1D4AC8CC49880708FA9B378E3C4F3A9060BEE67CF9A4"+
+				"A4A695811051907E162753B56B0F6B410DBA74D8A84B2A14B3144E0EF1284754"+
+				"FD17ED950D5965B4B9DD46582DB1178D169C6BC465B0D6FF9CA3928FEF5B9AE4"+
+				"E418FC15E83EBEA0F87FA9FF5EED70050DED2849F47BF959D956850CE929851F"+
+				"0D8115F635B105EE2E4E15D04B2454BF6F4FADF034B10403119CD8E3B92FCC5B"),
+		},
+	}
+}
+
+func TestSRP(t *testing.T) {
+	tests := []struct {
+		args        srpArgs
+		want        Answer
+		expectError assert.ErrorAssertionFunc
+	}{
+		{
+			args: testSRPInput(t),
+			want: Answer{
+				A:  setByte(256, 3),
+				M1: getHex(t, "999DF906BDA2C6CBB52F503406EBA2D0D0503ACE0CC302C38F13EE5010AD4051"),
+			},
+			expectError: assert.NoError,
+		},
+	}
+	for i := range tests {
+		tcase := tests[i]
+		t.Run(fmt.Sprintf("Test%d", i+1), func(t *testing.T) {
+			random := setByte(256, 1)
+			srp := NewSRP(rand.Reader)
+			got, err := srp.Hash(tcase.args.password, tcase.args.srpB, random, tcase.args.mp)
+			if !tcase.expectError(t, err) {
+				return
+			}
+
+			if !assert.Equal(t, tcase.want, got) {
+				return
+			}
+		})
+	}
+}
+
+func getHex(t testing.TB, in string) []byte {
+	res, err := hex.DecodeString(in)
+	if err != nil {
+		t.Fatal("failed to get hex", err)
+	}
+	return res
+}
+
+func setByte(size, value int) []byte {
+	res := make([]byte, size)
+	binary.BigEndian.PutUint32(res[size-4:], uint32(value))
+	return res
+}
+
+const pBase64 = "xxyuucaxyQSObFIvcPE_c5gNQCOOPiHBSTTQN1Y9kw9IGYoKp8FAWCKUk9IlMPTb-jNvbgrJJROVQ67UTM58NyD9UfaUWHBaxozU_" +
+	"mtrE6vcl0ZRKWkyhFTxj6-MWV9kJHf-lrsqlB1bzR1KyMxJiAcI-ps3jjxPOpBgvuZ8-aSkppWBEFGQfhYnU7VrD2tBDbp02KhLKhSzFE4O8ShHVP0" +
+	"X7ZUNWWW0ud1GWC2xF40WnGvEZbDW_5yjko_vW5rk5Bj8Feg-vqD4f6n_Xu1wBQ3tKEn0e_lZ2VaFDOkphR8NgRX2NbEF7i5OFdBLJFS_b0-" +
+	"t8DSxBAMRnNjjuS_MWw=="
+
+func Test_checkInput(t *testing.T) {
+	p, err := base64.URLEncoding.DecodeString(pBase64)
+	if err != nil {
+		t.Fatal("no err expected", err)
+	}
+
+	err = checkInput(3, big.NewInt(0).SetBytes(p))
+	if err != nil {
+		t.Fatal("no err expected", err)
+	}
+}
+
+func BenchmarkSRP_Auth(b *testing.B) {
+	input := testSRPInput(b)
+	srp := NewSRP(rand.Reader)
+	random := setByte(256, 1)
+
+	b.ResetTimer()
+	b.ReportAllocs()
+
+	for i := 0; i < b.N; i++ {
+		_, _ = srp.Hash(input.password, input.srpB, random, input.mp)
+	}
+}