10938694738

Committed 19 Sep 2024 09:57AM UTC coverage: 49.984% (-8.8%) from 58.784%

Build # 10938694738

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push

github

Committed by

web-flow

Commit Message

Merge pull request #9123 from guggero/bump-18-99

build: bump master to version v0.18.99-beta

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55.99

/zpay32/encode.go

package zpay32

import (
        "bytes"
        "encoding/binary"
        "fmt"

        "github.com/btcsuite/btcd/btcutil"
        "github.com/btcsuite/btcd/btcutil/bech32"
        "github.com/btcsuite/btcd/chaincfg"
        "github.com/btcsuite/btcd/chaincfg/chainhash"
        "github.com/lightningnetwork/lnd/lnwire"
)

// Encode takes the given MessageSigner and returns a string encoding this
// invoice signed by the node key of the signer.
func (invoice *Invoice) Encode(signer MessageSigner) (string, error) {
        // First check that this invoice is valid before starting the encoding.
        if err := validateInvoice(invoice); err != nil {
                return "", err
        }

        // The buffer will encoded the invoice data using 5-bit groups (base32).
        var bufferBase32 bytes.Buffer

        // The timestamp will be encoded using 35 bits, in base32.
        timestampBase32 := uint64ToBase32(uint64(invoice.Timestamp.Unix()))

        // The timestamp must be exactly 35 bits, which means 7 groups. If it
        // can fit into fewer groups we add leading zero groups, if it is too
        // big we fail early, as there is not possible to encode it.
        if len(timestampBase32) > timestampBase32Len {
                return "", fmt.Errorf("timestamp too big: %d",
                        invoice.Timestamp.Unix())
        }

        // Add zero bytes to the first timestampBase32Len-len(timestampBase32)
        // groups, then add the non-zero groups.
        zeroes := make([]byte, timestampBase32Len-len(timestampBase32))
        _, err := bufferBase32.Write(zeroes)
        if err != nil {
                return "", fmt.Errorf("unable to write to buffer: %w", err)
        }
        _, err = bufferBase32.Write(timestampBase32)
        if err != nil {
                return "", fmt.Errorf("unable to write to buffer: %w", err)
        }

        // We now write the tagged fields to the buffer, which will fill the
        // rest of the data part before the signature.
        if err := writeTaggedFields(&bufferBase32, invoice); err != nil {
                return "", err
        }

        // The human-readable part (hrp) is "ln" + net hrp + optional amount,
        // except for signet where we add an additional "s" to differentiate it
        // from the older testnet3 (Core devs decided to use the same hrp for
        // signet as for testnet3 which is not optimal for LN). See
        // https://github.com/lightningnetwork/lightning-rfc/pull/844 for more
        // information.
        hrp := "ln" + invoice.Net.Bech32HRPSegwit
        if invoice.Net.Name == chaincfg.SigNetParams.Name {
                hrp = "lntbs"
        }
        if invoice.MilliSat != nil {
                // Encode the amount using the fewest possible characters.
                am, err := encodeAmount(*invoice.MilliSat)
                if err != nil {
                        return "", err
                }
                hrp += am
        }

        // The signature is over the single SHA-256 hash of the hrp + the
        // tagged fields encoded in base256.
        taggedFieldsBytes, err := bech32.ConvertBits(bufferBase32.Bytes(), 5, 8, true)
        if err != nil {
                return "", err
        }

        toSign := append([]byte(hrp), taggedFieldsBytes...)

        // We use compact signature format, and also encoded the recovery ID
        // such that a reader of the invoice can recover our pubkey from the
        // signature.
        sign, err := signer.SignCompact(toSign)
        if err != nil {
                return "", err
        }

        // From the header byte we can extract the recovery ID, and the last 64
        // bytes encode the signature.
        recoveryID := sign[0] - 27 - 4
        sig, err := lnwire.NewSigFromWireECDSA(sign[1:])
        if err != nil {
                return "", err
        }

        // If the pubkey field was explicitly set, it must be set to the pubkey
        // used to create the signature.
        if invoice.Destination != nil {
                signature, err := sig.ToSignature()
                if err != nil {
                        return "", fmt.Errorf("unable to deserialize "+
                                "signature: %v", err)
                }

                hash := chainhash.HashB(toSign)
                valid := signature.Verify(hash, invoice.Destination)
                if !valid {
                        return "", fmt.Errorf("signature does not match " +
                                "provided pubkey")
                }
        }

        // Convert the signature to base32 before writing it to the buffer.
        signBase32, err := bech32.ConvertBits(
                append(sig.RawBytes(), recoveryID),
                8, 5, true,
        )
        if err != nil {
                return "", err
        }
        bufferBase32.Write(signBase32)

        // Now we can create the bech32 encoded string from the base32 buffer.
        b32, err := bech32.Encode(hrp, bufferBase32.Bytes())
        if err != nil {
                return "", err
        }

        // Before returning, check that the bech32 encoded string is not greater
        // than our largest supported invoice size.
        if len(b32) > maxInvoiceLength {
                return "", ErrInvoiceTooLarge
        }

        return b32, nil
}

// writeTaggedFields writes the non-nil tagged fields of the Invoice to the
// base32 buffer.
func writeTaggedFields(bufferBase32 *bytes.Buffer, invoice *Invoice) error {
        if invoice.PaymentHash != nil {
                err := writeBytes32(bufferBase32, fieldTypeP, *invoice.PaymentHash)
                if err != nil {
                        return err
                }
        }

        if invoice.Description != nil {
                base32, err := bech32.ConvertBits([]byte(*invoice.Description),
                        8, 5, true)
                if err != nil {
                        return err
                }
                err = writeTaggedField(bufferBase32, fieldTypeD, base32)
                if err != nil {
                        return err
                }
        }

        if invoice.DescriptionHash != nil {
                err := writeBytes32(
                        bufferBase32, fieldTypeH, *invoice.DescriptionHash,
                )
                if err != nil {
                        return err
                }
        }

        if invoice.Metadata != nil {
                base32, err := bech32.ConvertBits(invoice.Metadata, 8, 5, true)
                if err != nil {
                        return err
                }
                err = writeTaggedField(bufferBase32, fieldTypeM, base32)
                if err != nil {
                        return err
                }
        }

        if invoice.minFinalCLTVExpiry != nil {
                finalDelta := uint64ToBase32(*invoice.minFinalCLTVExpiry)
                err := writeTaggedField(bufferBase32, fieldTypeC, finalDelta)
                if err != nil {
                        return err
                }
        }

        if invoice.expiry != nil {
                seconds := invoice.expiry.Seconds()
                expiry := uint64ToBase32(uint64(seconds))
                err := writeTaggedField(bufferBase32, fieldTypeX, expiry)
                if err != nil {
                        return err
                }
        }

        if invoice.FallbackAddr != nil {
                var version byte
                switch addr := invoice.FallbackAddr.(type) {
                case *btcutil.AddressPubKeyHash:
                        version = 17
                case *btcutil.AddressScriptHash:
                        version = 18
                case *btcutil.AddressWitnessPubKeyHash:
                        version = addr.WitnessVersion()
                case *btcutil.AddressWitnessScriptHash:
                        version = addr.WitnessVersion()
                default:
                        return fmt.Errorf("unknown fallback address type")
                }
                base32Addr, err := bech32.ConvertBits(
                        invoice.FallbackAddr.ScriptAddress(), 8, 5, true)
                if err != nil {
                        return err
                }

                err = writeTaggedField(bufferBase32, fieldTypeF,
                        append([]byte{version}, base32Addr...))
                if err != nil {
                        return err
                }
        }

        for _, routeHint := range invoice.RouteHints {
                // Each hop hint is encoded using 51 bytes, so we'll make to
                // sure to allocate enough space for the whole route hint.
                routeHintBase256 := make([]byte, 0, hopHintLen*len(routeHint))

                for _, hopHint := range routeHint {
                        hopHintBase256 := make([]byte, hopHintLen)
                        copy(hopHintBase256[:33], hopHint.NodeID.SerializeCompressed())
                        binary.BigEndian.PutUint64(
                                hopHintBase256[33:41], hopHint.ChannelID,
                        )
                        binary.BigEndian.PutUint32(
                                hopHintBase256[41:45], hopHint.FeeBaseMSat,
                        )
                        binary.BigEndian.PutUint32(
                                hopHintBase256[45:49], hopHint.FeeProportionalMillionths,
                        )
                        binary.BigEndian.PutUint16(
                                hopHintBase256[49:51], hopHint.CLTVExpiryDelta,
                        )
                        routeHintBase256 = append(routeHintBase256, hopHintBase256...)
                }

                routeHintBase32, err := bech32.ConvertBits(
                        routeHintBase256, 8, 5, true,
                )
                if err != nil {
                        return err
                }

                err = writeTaggedField(bufferBase32, fieldTypeR, routeHintBase32)
                if err != nil {
                        return err
                }
        }

        for _, path := range invoice.BlindedPaymentPaths {
                var buf bytes.Buffer

                err := path.Encode(&buf)
                if err != nil {
                        return err
                }

                blindedPathBase32, err := bech32.ConvertBits(
                        buf.Bytes(), 8, 5, true,
                )
                if err != nil {
                        return err
                }

                err = writeTaggedField(
                        bufferBase32, fieldTypeB, blindedPathBase32,
                )
                if err != nil {
                        return err
                }
        }

        if invoice.Destination != nil {
                // Convert 33 byte pubkey to 53 5-bit groups.
                pubKeyBase32, err := bech32.ConvertBits(
                        invoice.Destination.SerializeCompressed(), 8, 5, true)
                if err != nil {
                        return err
                }

                if len(pubKeyBase32) != pubKeyBase32Len {
                        return fmt.Errorf("invalid pubkey length: %d",
                                len(invoice.Destination.SerializeCompressed()))
                }

                err = writeTaggedField(bufferBase32, fieldTypeN, pubKeyBase32)
                if err != nil {
                        return err
                }
        }
        if invoice.PaymentAddr != nil {
                err := writeBytes32(
                        bufferBase32, fieldTypeS, *invoice.PaymentAddr,
                )
                if err != nil {
                        return err
                }
        }
        if invoice.Features.SerializeSize32() > 0 {
                var b bytes.Buffer
                err := invoice.Features.RawFeatureVector.EncodeBase32(&b)
                if err != nil {
                        return err
                }

                err = writeTaggedField(bufferBase32, fieldType9, b.Bytes())
                if err != nil {
                        return err
                }
        }

        return nil
}

// writeBytes32 encodes a 32-byte array as base32 and writes it to bufferBase32
// under the passed fieldType.
func writeBytes32(bufferBase32 *bytes.Buffer, fieldType byte, b [32]byte) error {
        // Convert 32 byte hash to 52 5-bit groups.
        base32, err := bech32.ConvertBits(b[:], 8, 5, true)
        if err != nil {
                return err
        }

        return writeTaggedField(bufferBase32, fieldType, base32)
}

// writeTaggedField takes the type of a tagged data field, and the data of
// the tagged field (encoded in base32), and writes the type, length and data
// to the buffer.
func writeTaggedField(bufferBase32 *bytes.Buffer, dataType byte, data []byte) error {
        // Length must be exactly 10 bits, so add leading zero groups if
        // needed.
        lenBase32 := uint64ToBase32(uint64(len(data)))
        for len(lenBase32) < 2 {
                lenBase32 = append([]byte{0}, lenBase32...)
        }

        if len(lenBase32) != 2 {
                return fmt.Errorf("data length too big to fit within 10 bits: %d",
                        len(data))
        }

        err := bufferBase32.WriteByte(dataType)
        if err != nil {
                return fmt.Errorf("unable to write to buffer: %w", err)
        }
        _, err = bufferBase32.Write(lenBase32)
        if err != nil {
                return fmt.Errorf("unable to write to buffer: %w", err)
        }
        _, err = bufferBase32.Write(data)
        if err != nil {
                return fmt.Errorf("unable to write to buffer: %w", err)
        }

        return nil
}

// uint64ToBase32 converts a uint64 to a base32 encoded integer encoded using
// as few 5-bit groups as possible.
func uint64ToBase32(num uint64) []byte {
        // Return at least one group.
        if num == 0 {
                return []byte{0}
        }

        // To fit an uint64, we need at most is ceil(64 / 5) = 13 groups.
        arr := make([]byte, 13)
        i := 13
        for num > 0 {
                i--
                arr[i] = byte(num & uint64(31)) // 0b11111 in binary
                num >>= 5
        }

        // We only return non-zero leading groups.
        return arr[i:]
}

1	package zpay32
2
3	import (
4	"bytes"
5	"encoding/binary"
6	"fmt"
7
8	"github.com/btcsuite/btcd/btcutil"
9	"github.com/btcsuite/btcd/btcutil/bech32"
10	"github.com/btcsuite/btcd/chaincfg"
11	"github.com/btcsuite/btcd/chaincfg/chainhash"
12	"github.com/lightningnetwork/lnd/lnwire"
13	)
14
15	// Encode takes the given MessageSigner and returns a string encoding this
16	// invoice signed by the node key of the signer.
17	func (invoice *Invoice) Encode(signer MessageSigner) (string, error) {	3✔
18	// First check that this invoice is valid before starting the encoding.	3✔
19	if err := validateInvoice(invoice); err != nil {	3✔
20	return "", err	×
21	}	×
22
23	// The buffer will encoded the invoice data using 5-bit groups (base32).
24	var bufferBase32 bytes.Buffer	3✔
25		3✔
26	// The timestamp will be encoded using 35 bits, in base32.	3✔
27	timestampBase32 := uint64ToBase32(uint64(invoice.Timestamp.Unix()))	3✔
28		3✔
29	// The timestamp must be exactly 35 bits, which means 7 groups. If it	3✔
30	// can fit into fewer groups we add leading zero groups, if it is too	3✔
31	// big we fail early, as there is not possible to encode it.	3✔
32	if len(timestampBase32) > timestampBase32Len {	3✔
33	return "", fmt.Errorf("timestamp too big: %d",	×
34	invoice.Timestamp.Unix())	×
35	}	×
36
37	// Add zero bytes to the first timestampBase32Len-len(timestampBase32)
38	// groups, then add the non-zero groups.
39	zeroes := make([]byte, timestampBase32Len-len(timestampBase32))	3✔
40	_, err := bufferBase32.Write(zeroes)	3✔
41	if err != nil {	3✔
42	return "", fmt.Errorf("unable to write to buffer: %w", err)	×
43	}	×
44	_, err = bufferBase32.Write(timestampBase32)	3✔
45	if err != nil {	3✔
46	return "", fmt.Errorf("unable to write to buffer: %w", err)	×
47	}	×
48
49	// We now write the tagged fields to the buffer, which will fill the
50	// rest of the data part before the signature.
51	if err := writeTaggedFields(&bufferBase32, invoice); err != nil {	3✔
52	return "", err	×
53	}	×
54
55	// The human-readable part (hrp) is "ln" + net hrp + optional amount,
56	// except for signet where we add an additional "s" to differentiate it
57	// from the older testnet3 (Core devs decided to use the same hrp for
58	// signet as for testnet3 which is not optimal for LN). See
59	// https://github.com/lightningnetwork/lightning-rfc/pull/844 for more
60	// information.
61	hrp := "ln" + invoice.Net.Bech32HRPSegwit	3✔
62	if invoice.Net.Name == chaincfg.SigNetParams.Name {	3✔
63	hrp = "lntbs"	×
64	}	×
65	if invoice.MilliSat != nil {	6✔
66	// Encode the amount using the fewest possible characters.	3✔
67	am, err := encodeAmount(*invoice.MilliSat)	3✔
68	if err != nil {	3✔
69	return "", err	×
70	}	×
71	hrp += am	3✔
72	}
73
74	// The signature is over the single SHA-256 hash of the hrp + the
75	// tagged fields encoded in base256.
76	taggedFieldsBytes, err := bech32.ConvertBits(bufferBase32.Bytes(), 5, 8, true)	3✔
77	if err != nil {	3✔
78	return "", err	×
79	}	×
80
81	toSign := append([]byte(hrp), taggedFieldsBytes...)	3✔
82		3✔
83	// We use compact signature format, and also encoded the recovery ID	3✔
84	// such that a reader of the invoice can recover our pubkey from the	3✔
85	// signature.	3✔
86	sign, err := signer.SignCompact(toSign)	3✔
87	if err != nil {	3✔
88	return "", err	×
89	}	×
90
91	// From the header byte we can extract the recovery ID, and the last 64
92	// bytes encode the signature.
93	recoveryID := sign[0] - 27 - 4	3✔
94	sig, err := lnwire.NewSigFromWireECDSA(sign[1:])	3✔
95	if err != nil {	3✔
96	return "", err	×
97	}	×
98
99	// If the pubkey field was explicitly set, it must be set to the pubkey
100	// used to create the signature.
101	if invoice.Destination != nil {	3✔
102	signature, err := sig.ToSignature()	×
103	if err != nil {	×
104	return "", fmt.Errorf("unable to deserialize "+	×
105	"signature: %v", err)	×
106	}	×
107
108	hash := chainhash.HashB(toSign)	×
109	valid := signature.Verify(hash, invoice.Destination)	×
110	if !valid {	×
111	return "", fmt.Errorf("signature does not match " +	×
112	"provided pubkey")	×
113	}	×
114	}
115
116	// Convert the signature to base32 before writing it to the buffer.
117	signBase32, err := bech32.ConvertBits(	3✔
118	append(sig.RawBytes(), recoveryID),	3✔
119	8, 5, true,	3✔
120	)	3✔
121	if err != nil {	3✔
122	return "", err	×
123	}	×
124	bufferBase32.Write(signBase32)	3✔
125		3✔
126	// Now we can create the bech32 encoded string from the base32 buffer.	3✔
127	b32, err := bech32.Encode(hrp, bufferBase32.Bytes())	3✔
128	if err != nil {	3✔
129	return "", err	×
130	}	×
131
132	// Before returning, check that the bech32 encoded string is not greater
133	// than our largest supported invoice size.
134	if len(b32) > maxInvoiceLength {	3✔
135	return "", ErrInvoiceTooLarge	×
136	}	×
137
138	return b32, nil	3✔
139	}
140
141	// writeTaggedFields writes the non-nil tagged fields of the Invoice to the
142	// base32 buffer.
143	func writeTaggedFields(bufferBase32 bytes.Buffer, invoice Invoice) error {	3✔
144	if invoice.PaymentHash != nil {	6✔
145	err := writeBytes32(bufferBase32, fieldTypeP, *invoice.PaymentHash)	3✔
146	if err != nil {	3✔
147	return err	×
148	}	×
149	}
150
151	if invoice.Description != nil {	6✔
152	base32, err := bech32.ConvertBits([]byte(*invoice.Description),	3✔
153	8, 5, true)	3✔
154	if err != nil {	3✔
155	return err	×
156	}	×
157	err = writeTaggedField(bufferBase32, fieldTypeD, base32)	3✔
158	if err != nil {	3✔
159	return err	×
160	}	×
161	}
162
163	if invoice.DescriptionHash != nil {	3✔
164	err := writeBytes32(	×
165	bufferBase32, fieldTypeH, *invoice.DescriptionHash,	×
166	)	×
167	if err != nil {	×
168	return err	×
169	}	×
170	}
171
172	if invoice.Metadata != nil {	3✔
173	base32, err := bech32.ConvertBits(invoice.Metadata, 8, 5, true)	×
174	if err != nil {	×
175	return err	×
176	}	×
177	err = writeTaggedField(bufferBase32, fieldTypeM, base32)	×
178	if err != nil {	×
179	return err	×
180	}	×
181	}
182
183	if invoice.minFinalCLTVExpiry != nil {	6✔
184	finalDelta := uint64ToBase32(*invoice.minFinalCLTVExpiry)	3✔
185	err := writeTaggedField(bufferBase32, fieldTypeC, finalDelta)	3✔
186	if err != nil {	3✔
187	return err	×
188	}	×
189	}
190
191	if invoice.expiry != nil {	6✔
192	seconds := invoice.expiry.Seconds()	3✔
193	expiry := uint64ToBase32(uint64(seconds))	3✔
194	err := writeTaggedField(bufferBase32, fieldTypeX, expiry)	3✔
195	if err != nil {	3✔
196	return err	×
197	}	×
198	}
199
200	if invoice.FallbackAddr != nil {	3✔
201	var version byte	×
202	switch addr := invoice.FallbackAddr.(type) {	×
203	case *btcutil.AddressPubKeyHash:	×
204	version = 17	×
205	case *btcutil.AddressScriptHash:	×
206	version = 18	×
207	case *btcutil.AddressWitnessPubKeyHash:	×
208	version = addr.WitnessVersion()	×
209	case *btcutil.AddressWitnessScriptHash:	×
210	version = addr.WitnessVersion()	×
211	default:	×
212	return fmt.Errorf("unknown fallback address type")	×
213	}
214	base32Addr, err := bech32.ConvertBits(	×
215	invoice.FallbackAddr.ScriptAddress(), 8, 5, true)	×
216	if err != nil {	×
217	return err	×
218	}	×
219
220	err = writeTaggedField(bufferBase32, fieldTypeF,	×
221	append([]byte{version}, base32Addr...))	×
222	if err != nil {	×
223	return err	×
224	}	×
225	}
226
227	for _, routeHint := range invoice.RouteHints {	6✔
228	// Each hop hint is encoded using 51 bytes, so we'll make to	3✔
229	// sure to allocate enough space for the whole route hint.	3✔
230	routeHintBase256 := make([]byte, 0, hopHintLen*len(routeHint))	3✔
231		3✔
232	for _, hopHint := range routeHint {	6✔
233	hopHintBase256 := make([]byte, hopHintLen)	3✔
234	copy(hopHintBase256[:33], hopHint.NodeID.SerializeCompressed())	3✔
235	binary.BigEndian.PutUint64(	3✔
236	hopHintBase256[33:41], hopHint.ChannelID,	3✔
237	)	3✔
238	binary.BigEndian.PutUint32(	3✔
239	hopHintBase256[41:45], hopHint.FeeBaseMSat,	3✔
240	)	3✔
241	binary.BigEndian.PutUint32(	3✔
242	hopHintBase256[45:49], hopHint.FeeProportionalMillionths,	3✔
243	)	3✔
244	binary.BigEndian.PutUint16(	3✔
245	hopHintBase256[49:51], hopHint.CLTVExpiryDelta,	3✔
246	)	3✔
247	routeHintBase256 = append(routeHintBase256, hopHintBase256...)	3✔
248	}	3✔
249
250	routeHintBase32, err := bech32.ConvertBits(	3✔
251	routeHintBase256, 8, 5, true,	3✔
252	)	3✔
253	if err != nil {	3✔
254	return err	×
255	}	×
256
257	err = writeTaggedField(bufferBase32, fieldTypeR, routeHintBase32)	3✔
258	if err != nil {	3✔
259	return err	×
260	}	×
261	}
262
263	for _, path := range invoice.BlindedPaymentPaths {	6✔
264	var buf bytes.Buffer	3✔
265		3✔
266	err := path.Encode(&buf)	3✔
267	if err != nil {	3✔
268	return err	×
269	}	×
270
271	blindedPathBase32, err := bech32.ConvertBits(	3✔
272	buf.Bytes(), 8, 5, true,	3✔
273	)	3✔
274	if err != nil {	3✔
275	return err	×
276	}	×
277
278	err = writeTaggedField(	3✔
279	bufferBase32, fieldTypeB, blindedPathBase32,	3✔
280	)	3✔
281	if err != nil {	3✔
282	return err	×
283	}	×
284	}
285
286	if invoice.Destination != nil {	3✔
287	// Convert 33 byte pubkey to 53 5-bit groups.	×
288	pubKeyBase32, err := bech32.ConvertBits(	×
289	invoice.Destination.SerializeCompressed(), 8, 5, true)	×
290	if err != nil {	×
291	return err	×
292	}	×
293
294	if len(pubKeyBase32) != pubKeyBase32Len {	×
295	return fmt.Errorf("invalid pubkey length: %d",	×
296	len(invoice.Destination.SerializeCompressed()))	×
297	}	×
298
299	err = writeTaggedField(bufferBase32, fieldTypeN, pubKeyBase32)	×
300	if err != nil {	×
301	return err	×
302	}	×
303	}
304	if invoice.PaymentAddr != nil {	6✔
305	err := writeBytes32(	3✔
306	bufferBase32, fieldTypeS, *invoice.PaymentAddr,	3✔
307	)	3✔
308	if err != nil {	3✔
309	return err	×
310	}	×
311	}
312	if invoice.Features.SerializeSize32() > 0 {	6✔
313	var b bytes.Buffer	3✔
314	err := invoice.Features.RawFeatureVector.EncodeBase32(&b)	3✔
315	if err != nil {	3✔
316	return err	×
317	}	×
318
319	err = writeTaggedField(bufferBase32, fieldType9, b.Bytes())	3✔
320	if err != nil {	3✔
321	return err	×
322	}	×
323	}
324
325	return nil	3✔
326	}
327
328	// writeBytes32 encodes a 32-byte array as base32 and writes it to bufferBase32
329	// under the passed fieldType.
330	func writeBytes32(bufferBase32 *bytes.Buffer, fieldType byte, b [32]byte) error {	3✔
331	// Convert 32 byte hash to 52 5-bit groups.	3✔
332	base32, err := bech32.ConvertBits(b[:], 8, 5, true)	3✔
333	if err != nil {	3✔
334	return err	×
335	}	×
336
337	return writeTaggedField(bufferBase32, fieldType, base32)	3✔
338	}
339
340	// writeTaggedField takes the type of a tagged data field, and the data of
341	// the tagged field (encoded in base32), and writes the type, length and data
342	// to the buffer.
343	func writeTaggedField(bufferBase32 *bytes.Buffer, dataType byte, data []byte) error {	3✔
344	// Length must be exactly 10 bits, so add leading zero groups if	3✔
345	// needed.	3✔
346	lenBase32 := uint64ToBase32(uint64(len(data)))	3✔
347	for len(lenBase32) < 2 {	6✔
348	lenBase32 = append([]byte{0}, lenBase32...)	3✔
349	}	3✔
350
351	if len(lenBase32) != 2 {	3✔
352	return fmt.Errorf("data length too big to fit within 10 bits: %d",	×
353	len(data))	×
354	}	×
355
356	err := bufferBase32.WriteByte(dataType)	3✔
357	if err != nil {	3✔
358	return fmt.Errorf("unable to write to buffer: %w", err)	×
359	}	×
360	_, err = bufferBase32.Write(lenBase32)	3✔
361	if err != nil {	3✔
362	return fmt.Errorf("unable to write to buffer: %w", err)	×
363	}	×
364	_, err = bufferBase32.Write(data)	3✔
365	if err != nil {	3✔
366	return fmt.Errorf("unable to write to buffer: %w", err)	×
367	}	×
368
369	return nil	3✔
370	}
371
372	// uint64ToBase32 converts a uint64 to a base32 encoded integer encoded using
373	// as few 5-bit groups as possible.
374	func uint64ToBase32(num uint64) []byte {	3✔
375	// Return at least one group.	3✔
376	if num == 0 {	6✔
377	return []byte{0}	3✔
378	}	3✔
379
380	// To fit an uint64, we need at most is ceil(64 / 5) = 13 groups.
381	arr := make([]byte, 13)	3✔
382	i := 13	3✔
383	for num > 0 {	6✔
384	i--	3✔
385	arr[i] = byte(num & uint64(31)) // 0b11111 in binary	3✔
386	num >>= 5	3✔
387	}	3✔
388
389	// We only return non-zero leading groups.
390	return arr[i:]	3✔
391	}

lightningnetwork / lnd / 10938694738

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