How to use Len method of version Package

Best Gauge code snippet using version.Len

prf.go

Source:prf.go Github

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...90 i++91 }92}93const (94 tlsRandomLength = 32 // Length of a random nonce in TLS 1.1.95 masterSecretLength = 48 // Length of a master secret in TLS 1.1.96 finishedVerifyLength = 12 // Length of verify_data in a Finished message.97)98var masterSecretLabel = []byte("master secret")99var extendedMasterSecretLabel = []byte("extended master secret")100var keyExpansionLabel = []byte("key expansion")101var clientFinishedLabel = []byte("client finished")102var serverFinishedLabel = []byte("server finished")103var finishedLabel = []byte("finished")104var channelIDLabel = []byte("TLS Channel ID signature\x00")105var channelIDResumeLabel = []byte("Resumption\x00")106func prfForVersion(version uint16, suite *cipherSuite) func(result, secret, label, seed []byte) {107 switch version {108 case VersionSSL30:109 return prf30110 case VersionTLS10, VersionTLS11:111 return prf10112 case VersionTLS12:113 return prf12(suite.hash().New)114 }115 panic("unknown version")116}117// masterFromPreMasterSecret generates the master secret from the pre-master118// secret. See http://tools.ietf.org/html/rfc5246#section-8.1119func masterFromPreMasterSecret(version uint16, suite *cipherSuite, preMasterSecret, clientRandom, serverRandom []byte) []byte {120 var seed [tlsRandomLength * 2]byte121 copy(seed[0:len(clientRandom)], clientRandom)122 copy(seed[len(clientRandom):], serverRandom)123 masterSecret := make([]byte, masterSecretLength)124 prfForVersion(version, suite)(masterSecret, preMasterSecret, masterSecretLabel, seed[0:])125 return masterSecret126}127// extendedMasterFromPreMasterSecret generates the master secret from the128// pre-master secret when the Triple Handshake fix is in effect. See129// https://tools.ietf.org/html/rfc7627130func extendedMasterFromPreMasterSecret(version uint16, suite *cipherSuite, preMasterSecret []byte, h finishedHash) []byte {131 masterSecret := make([]byte, masterSecretLength)132 prfForVersion(version, suite)(masterSecret, preMasterSecret, extendedMasterSecretLabel, h.Sum())133 return masterSecret134}135// keysFromMasterSecret generates the connection keys from the master136// secret, given the lengths of the MAC key, cipher key and IV, as defined in137// RFC 2246, section 6.3.138func keysFromMasterSecret(version uint16, suite *cipherSuite, masterSecret, clientRandom, serverRandom []byte, macLen, keyLen, ivLen int) (clientMAC, serverMAC, clientKey, serverKey, clientIV, serverIV []byte) {139 var seed [tlsRandomLength * 2]byte140 copy(seed[0:len(clientRandom)], serverRandom)141 copy(seed[len(serverRandom):], clientRandom)142 n := 2*macLen + 2*keyLen + 2*ivLen143 keyMaterial := make([]byte, n)144 prfForVersion(version, suite)(keyMaterial, masterSecret, keyExpansionLabel, seed[0:])145 clientMAC = keyMaterial[:macLen]146 keyMaterial = keyMaterial[macLen:]147 serverMAC = keyMaterial[:macLen]148 keyMaterial = keyMaterial[macLen:]149 clientKey = keyMaterial[:keyLen]150 keyMaterial = keyMaterial[keyLen:]151 serverKey = keyMaterial[:keyLen]152 keyMaterial = keyMaterial[keyLen:]153 clientIV = keyMaterial[:ivLen]154 keyMaterial = keyMaterial[ivLen:]155 serverIV = keyMaterial[:ivLen]156 return157}158func newFinishedHash(wireVersion uint16, isDTLS bool, cipherSuite *cipherSuite) finishedHash {159 var ret finishedHash160 version, ok := wireToVersion(wireVersion, isDTLS)161 if !ok {162 panic("unknown version")163 }164 if version >= VersionTLS12 {165 ret.hash = cipherSuite.hash()166 ret.client = ret.hash.New()167 ret.server = ret.hash.New()168 if version == VersionTLS12 {169 ret.prf = prf12(ret.hash.New)170 } else {171 ret.secret = make([]byte, ret.hash.Size())172 }173 } else {174 ret.hash = crypto.MD5SHA1175 ret.client = sha1.New()176 ret.server = sha1.New()177 ret.clientMD5 = md5.New()178 ret.serverMD5 = md5.New()179 ret.prf = prf10180 }181 ret.buffer = []byte{}182 ret.version = version183 ret.wireVersion = wireVersion184 return ret185}186// A finishedHash calculates the hash of a set of handshake messages suitable187// for including in a Finished message.188type finishedHash struct {189 hash crypto.Hash190 client hash.Hash191 server hash.Hash192 // Prior to TLS 1.2, an additional MD5 hash is required.193 clientMD5 hash.Hash194 serverMD5 hash.Hash195 // In TLS 1.2 (and SSL 3 for implementation convenience), a196 // full buffer is required.197 buffer []byte198 version uint16199 wireVersion uint16200 prf func(result, secret, label, seed []byte)201 // secret, in TLS 1.3, is the running input secret.202 secret []byte203}204func (h *finishedHash) UpdateForHelloRetryRequest() (err error) {205 data := newByteBuilder()206 data.addU8(typeMessageHash)207 data.addU24(h.hash.Size())208 data.addBytes(h.Sum())209 h.client = h.hash.New()210 h.server = h.hash.New()211 if h.buffer != nil {212 h.buffer = []byte{}213 }214 h.Write(data.finish())215 return nil216}217func (h *finishedHash) Write(msg []byte) (n int, err error) {218 h.client.Write(msg)219 h.server.Write(msg)220 if h.version < VersionTLS12 {221 h.clientMD5.Write(msg)222 h.serverMD5.Write(msg)223 }224 if h.buffer != nil {225 h.buffer = append(h.buffer, msg...)226 }227 return len(msg), nil228}229func (h finishedHash) Sum() []byte {230 if h.version >= VersionTLS12 {231 return h.client.Sum(nil)232 }233 out := make([]byte, 0, md5.Size+sha1.Size)234 out = h.clientMD5.Sum(out)235 return h.client.Sum(out)236}237// finishedSum30 calculates the contents of the verify_data member of a SSLv3238// Finished message given the MD5 and SHA1 hashes of a set of handshake239// messages.240func finishedSum30(md5, sha1 hash.Hash, masterSecret []byte, magic []byte) []byte {241 md5.Write(magic)242 md5.Write(masterSecret)243 md5.Write(ssl30Pad1[:])244 md5Digest := md5.Sum(nil)245 md5.Reset()246 md5.Write(masterSecret)247 md5.Write(ssl30Pad2[:])248 md5.Write(md5Digest)249 md5Digest = md5.Sum(nil)250 sha1.Write(magic)251 sha1.Write(masterSecret)252 sha1.Write(ssl30Pad1[:40])253 sha1Digest := sha1.Sum(nil)254 sha1.Reset()255 sha1.Write(masterSecret)256 sha1.Write(ssl30Pad2[:40])257 sha1.Write(sha1Digest)258 sha1Digest = sha1.Sum(nil)259 ret := make([]byte, len(md5Digest)+len(sha1Digest))260 copy(ret, md5Digest)261 copy(ret[len(md5Digest):], sha1Digest)262 return ret263}264var ssl3ClientFinishedMagic = [4]byte{0x43, 0x4c, 0x4e, 0x54}265var ssl3ServerFinishedMagic = [4]byte{0x53, 0x52, 0x56, 0x52}266// clientSum returns the contents of the verify_data member of a client's267// Finished message.268func (h finishedHash) clientSum(baseKey []byte) []byte {269 if h.version == VersionSSL30 {270 return finishedSum30(h.clientMD5, h.client, baseKey, ssl3ClientFinishedMagic[:])271 }272 if h.version < VersionTLS13 {273 out := make([]byte, finishedVerifyLength)274 h.prf(out, baseKey, clientFinishedLabel, h.Sum())275 return out276 }277 clientFinishedKey := hkdfExpandLabel(h.hash, baseKey, finishedLabel, nil, h.hash.Size())278 finishedHMAC := hmac.New(h.hash.New, clientFinishedKey)279 finishedHMAC.Write(h.appendContextHashes(nil))280 return finishedHMAC.Sum(nil)281}282// serverSum returns the contents of the verify_data member of a server's283// Finished message.284func (h finishedHash) serverSum(baseKey []byte) []byte {285 if h.version == VersionSSL30 {286 return finishedSum30(h.serverMD5, h.server, baseKey, ssl3ServerFinishedMagic[:])287 }288 if h.version < VersionTLS13 {289 out := make([]byte, finishedVerifyLength)290 h.prf(out, baseKey, serverFinishedLabel, h.Sum())291 return out292 }293 serverFinishedKey := hkdfExpandLabel(h.hash, baseKey, finishedLabel, nil, h.hash.Size())294 finishedHMAC := hmac.New(h.hash.New, serverFinishedKey)295 finishedHMAC.Write(h.appendContextHashes(nil))296 return finishedHMAC.Sum(nil)297}298// hashForClientCertificateSSL3 returns the hash to be signed for client299// certificates in SSL 3.0.300func (h finishedHash) hashForClientCertificateSSL3(masterSecret []byte) []byte {301 md5Hash := md5.New()302 md5Hash.Write(h.buffer)303 sha1Hash := sha1.New()304 sha1Hash.Write(h.buffer)305 return finishedSum30(md5Hash, sha1Hash, masterSecret, nil)306}307// hashForChannelID returns the hash to be signed for TLS Channel308// ID. If a resumption, resumeHash has the previous handshake309// hash. Otherwise, it is nil.310func (h finishedHash) hashForChannelID(resumeHash []byte) []byte {311 hash := sha256.New()312 hash.Write(channelIDLabel)313 if resumeHash != nil {314 hash.Write(channelIDResumeLabel)315 hash.Write(resumeHash)316 }317 hash.Write(h.Sum())318 return hash.Sum(nil)319}320// discardHandshakeBuffer is called when there is no more need to321// buffer the entirety of the handshake messages.322func (h *finishedHash) discardHandshakeBuffer() {323 h.buffer = nil324}325// zeroSecretTLS13 returns the default all zeros secret for TLS 1.3, used when a326// given secret is not available in the handshake. See RFC 8446, section 7.1.327func (h *finishedHash) zeroSecret() []byte {328 return make([]byte, h.hash.Size())329}330// addEntropy incorporates ikm into the running TLS 1.3 secret with HKDF-Expand.331func (h *finishedHash) addEntropy(ikm []byte) {332 h.secret = hkdfExtract(h.hash.New, h.secret, ikm)333}334func (h *finishedHash) nextSecret() {335 h.secret = hkdfExpandLabel(h.hash, h.secret, []byte("derived"), h.hash.New().Sum(nil), h.hash.Size())336}337// hkdfExpandLabel implements TLS 1.3's HKDF-Expand-Label function, as defined338// in section 7.1 of RFC 8446.339func hkdfExpandLabel(hash crypto.Hash, secret, label, hashValue []byte, length int) []byte {340 if len(label) > 255 || len(hashValue) > 255 {341 panic("hkdfExpandLabel: label or hashValue too long")342 }343 versionLabel := []byte("tls13 ")344 hkdfLabel := make([]byte, 3+len(versionLabel)+len(label)+1+len(hashValue))345 x := hkdfLabel346 x[0] = byte(length >> 8)347 x[1] = byte(length)348 x[2] = byte(len(versionLabel) + len(label))349 x = x[3:]350 copy(x, versionLabel)351 x = x[len(versionLabel):]352 copy(x, label)353 x = x[len(label):]354 x[0] = byte(len(hashValue))355 copy(x[1:], hashValue)356 return hkdfExpand(hash.New, secret, hkdfLabel, length)357}358// appendContextHashes returns the concatenation of the handshake hash and the359// resumption context hash, as used in TLS 1.3.360func (h *finishedHash) appendContextHashes(b []byte) []byte {361 b = h.client.Sum(b)362 return b363}364// The following are labels for traffic secret derivation in TLS 1.3.365var (366 externalPSKBinderLabel = []byte("ext binder")367 resumptionPSKBinderLabel = []byte("res binder")368 earlyTrafficLabel = []byte("c e traffic")369 clientHandshakeTrafficLabel = []byte("c hs traffic")370 serverHandshakeTrafficLabel = []byte("s hs traffic")371 clientApplicationTrafficLabel = []byte("c ap traffic")372 serverApplicationTrafficLabel = []byte("s ap traffic")373 applicationTrafficLabel = []byte("traffic upd")374 earlyExporterLabel = []byte("e exp master")375 exporterLabel = []byte("exp master")376 resumptionLabel = []byte("res master")377 resumptionPSKLabel = []byte("resumption")378)379// deriveSecret implements TLS 1.3's Derive-Secret function, as defined in380// section 7.1 of draft ietf-tls-tls13-16.381func (h *finishedHash) deriveSecret(label []byte) []byte {382 return hkdfExpandLabel(h.hash, h.secret, label, h.appendContextHashes(nil), h.hash.Size())383}384// The following are context strings for CertificateVerify in TLS 1.3.385var (386 clientCertificateVerifyContextTLS13 = []byte("TLS 1.3, client CertificateVerify")387 serverCertificateVerifyContextTLS13 = []byte("TLS 1.3, server CertificateVerify")388 channelIDContextTLS13 = []byte("TLS 1.3, Channel ID")389)390// certificateVerifyMessage returns the input to be signed for CertificateVerify391// in TLS 1.3.392func (h *finishedHash) certificateVerifyInput(context []byte) []byte {393 const paddingLen = 64394 b := make([]byte, paddingLen, paddingLen+len(context)+1+2*h.hash.Size())395 for i := 0; i < paddingLen; i++ {396 b[i] = 32397 }398 b = append(b, context...)399 b = append(b, 0)400 b = h.appendContextHashes(b)401 return b402}403type trafficDirection int404const (405 clientWrite trafficDirection = iota406 serverWrite407)408var (409 keyTLS13 = []byte("key")410 ivTLS13 = []byte("iv")411)412// deriveTrafficAEAD derives traffic keys and constructs an AEAD given a traffic413// secret.414func deriveTrafficAEAD(version uint16, suite *cipherSuite, secret []byte, side trafficDirection) interface{} {415 key := hkdfExpandLabel(suite.hash(), secret, keyTLS13, nil, suite.keyLen)416 iv := hkdfExpandLabel(suite.hash(), secret, ivTLS13, nil, suite.ivLen(version))417 return suite.aead(version, key, iv)418}419func updateTrafficSecret(hash crypto.Hash, version uint16, secret []byte) []byte {420 return hkdfExpandLabel(hash, secret, applicationTrafficLabel, nil, hash.Size())421}422func computePSKBinder(psk []byte, version uint16, label []byte, cipherSuite *cipherSuite, clientHello, helloRetryRequest, truncatedHello []byte) []byte {423 finishedHash := newFinishedHash(version, false, cipherSuite)424 finishedHash.addEntropy(psk)425 binderKey := finishedHash.deriveSecret(label)426 finishedHash.Write(clientHello)427 if len(helloRetryRequest) != 0 {428 finishedHash.UpdateForHelloRetryRequest()429 }430 finishedHash.Write(helloRetryRequest)...

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engine_key.go

Source:engine_key.go Github

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...34 Version []byte35}36const (37 engineKeyNoVersion = 038 engineKeyVersionWallTimeLen = 839 engineKeyVersionWallAndLogicalTimeLen = 1240 engineKeyVersionWallLogicalAndSyntheticTimeLen = 1341 engineKeyVersionLockTableLen = 1742)43// Format implements the fmt.Formatter interface44func (k EngineKey) Format(f fmt.State, c rune) {45 fmt.Fprintf(f, "%s/%x", k.Key, k.Version)46}47// Encoding:48// Key + \x00 (sentinel) [+ Version + <byte representing length of Version + 1>]49//50// The motivation for the sentinel is that we configure the underlying storage51// engine (Pebble) with a Split function that can be used for constructing52// Bloom filters over just the Key field. However, the encoded Key must also53// look like an encoded EngineKey. By splitting, at Key + \x00, the Key looks54// like an EngineKey with no Version.55const (56 sentinelLen = 157 suffixEncodedLengthLen = 158)59// Copy makes a copy of the key.60func (k EngineKey) Copy() EngineKey {61 buf := make([]byte, len(k.Key)+len(k.Version))62 copy(buf, k.Key)63 k.Key = buf[:len(k.Key)]64 if len(k.Version) > 0 {65 versionCopy := buf[len(k.Key):]66 copy(versionCopy, k.Version)67 k.Version = versionCopy68 }69 return k70}71// EncodedLen returns the encoded length of k.72func (k EngineKey) EncodedLen() int {73 n := len(k.Key) + suffixEncodedLengthLen74 versionLen := len(k.Version)75 if versionLen > 0 {76 n += sentinelLen + versionLen77 }78 return n79}80// Encode encoded the key.81func (k EngineKey) Encode() []byte {82 encodedLen := k.EncodedLen()83 buf := make([]byte, encodedLen)84 k.encodeToSizedBuf(buf)85 return buf86}87// EncodeToBuf attempts to reuse buf for encoding the key, and if undersized,88// allocates a new buffer.89func (k EngineKey) EncodeToBuf(buf []byte) []byte {90 encodedLen := k.EncodedLen()91 if cap(buf) < encodedLen {92 buf = make([]byte, encodedLen)93 } else {94 buf = buf[:encodedLen]95 }96 k.encodeToSizedBuf(buf)97 return buf98}99func (k EngineKey) encodeToSizedBuf(buf []byte) {100 copy(buf, k.Key)101 pos := len(k.Key)102 // The length of the suffix is the full encoded length (len(buf)) minus the103 // length of the key minus the length of the sentinel. Note that the104 // suffixLen is 0 when Version is empty, and when Version is non-empty, it105 // is len(Version)+1. That is, it includes the length byte at the end.106 suffixLen := len(buf) - pos - 1107 if suffixLen > 0 {108 buf[pos] = 0109 pos += sentinelLen110 copy(buf[pos:], k.Version)111 }112 buf[len(buf)-1] = byte(suffixLen)113}114// IsMVCCKey returns true if the key can be decoded as an MVCCKey.115// This includes the case of an empty timestamp.116func (k EngineKey) IsMVCCKey() bool {117 l := len(k.Version)118 return l == engineKeyNoVersion ||119 l == engineKeyVersionWallTimeLen ||120 l == engineKeyVersionWallAndLogicalTimeLen ||121 l == engineKeyVersionWallLogicalAndSyntheticTimeLen122}123// IsLockTableKey returns true if the key can be decoded as a LockTableKey.124func (k EngineKey) IsLockTableKey() bool {125 return len(k.Version) == engineKeyVersionLockTableLen126}127// ToMVCCKey constructs a MVCCKey from the EngineKey.128func (k EngineKey) ToMVCCKey() (MVCCKey, error) {129 key := MVCCKey{Key: k.Key}130 switch len(k.Version) {131 case engineKeyNoVersion:132 // No-op.133 case engineKeyVersionWallTimeLen:134 key.Timestamp.WallTime = int64(binary.BigEndian.Uint64(k.Version[0:8]))135 case engineKeyVersionWallAndLogicalTimeLen:136 key.Timestamp.WallTime = int64(binary.BigEndian.Uint64(k.Version[0:8]))137 key.Timestamp.Logical = int32(binary.BigEndian.Uint32(k.Version[8:12]))138 case engineKeyVersionWallLogicalAndSyntheticTimeLen:139 key.Timestamp.WallTime = int64(binary.BigEndian.Uint64(k.Version[0:8]))140 key.Timestamp.Logical = int32(binary.BigEndian.Uint32(k.Version[8:12]))141 key.Timestamp.Synthetic = k.Version[12] != 0142 default:143 return MVCCKey{}, errors.Errorf("version is not an encoded timestamp %x", k.Version)144 }145 return key, nil146}147// ToLockTableKey constructs a LockTableKey from the EngineKey.148func (k EngineKey) ToLockTableKey() (LockTableKey, error) {149 lockedKey, err := keys.DecodeLockTableSingleKey(k.Key)150 if err != nil {151 return LockTableKey{}, err152 }153 key := LockTableKey{Key: lockedKey}154 switch len(k.Version) {155 case engineKeyVersionLockTableLen:156 key.Strength = lock.Strength(k.Version[0])157 if key.Strength < lock.None || key.Strength > lock.Exclusive {158 return LockTableKey{}, errors.Errorf("unknown strength %d", key.Strength)159 }160 key.TxnUUID = k.Version[1:]161 default:162 return LockTableKey{}, errors.Errorf("version is not valid for a LockTableKey %x", k.Version)163 }164 return key, nil165}166// Validate checks if the EngineKey is a valid MVCCKey or LockTableKey.167func (k EngineKey) Validate() error {168 _, errMVCC := k.ToMVCCKey()169 _, errLock := k.ToLockTableKey()170 if errMVCC != nil && errLock != nil {171 return errors.Newf("key %s is neither an MVCCKey or LockTableKey", k)172 }173 return nil174}175// DecodeEngineKey decodes the given bytes as an EngineKey. This function is176// similar to enginepb.SplitMVCCKey.177// TODO(sumeer): consider removing SplitMVCCKey.178func DecodeEngineKey(b []byte) (key EngineKey, ok bool) {179 if len(b) == 0 {180 return EngineKey{}, false181 }182 // Last byte is the version length + 1 when there is a version,183 // else it is 0.184 versionLen := int(b[len(b)-1])185 // keyPartEnd points to the sentinel byte.186 keyPartEnd := len(b) - 1 - versionLen187 if keyPartEnd < 0 {188 return EngineKey{}, false189 }190 // Key excludes the sentinel byte.191 key.Key = b[:keyPartEnd]192 if versionLen > 0 {193 // Version consists of the bytes after the sentinel and before the length.194 key.Version = b[keyPartEnd+1 : len(b)-1]195 }196 return key, true197}198// GetKeyPartFromEngineKey is a specialization of DecodeEngineKey which avoids199// constructing a slice for the version part of the key, since the caller does200// not need it.201func GetKeyPartFromEngineKey(engineKey []byte) (key []byte, ok bool) {202 if len(engineKey) == 0 {203 return nil, false204 }205 // Last byte is the version length + 1 when there is a version,206 // else it is 0.207 versionLen := int(engineKey[len(engineKey)-1])208 // keyPartEnd points to the sentinel byte.209 keyPartEnd := len(engineKey) - 1 - versionLen210 if keyPartEnd < 0 {211 return nil, false212 }213 // Key excludes the sentinel byte.214 return engineKey[:keyPartEnd], true215}216// EngineKeyFormatter is a fmt.Formatter for EngineKeys.217type EngineKeyFormatter struct {218 key EngineKey219}220var _ fmt.Formatter = EngineKeyFormatter{}221// Format implements the fmt.Formatter interface.222func (m EngineKeyFormatter) Format(f fmt.State, c rune) {223 m.key.Format(f, c)224}225// LockTableKey is a key representing a lock in the lock table.226type LockTableKey struct {227 Key roachpb.Key228 Strength lock.Strength229 // Slice is of length uuid.Size. We use a slice instead of a byte array, to230 // avoid copying a slice when decoding.231 TxnUUID []byte232}233// ToEngineKey converts a lock table key to an EngineKey. buf is used as234// scratch-space to avoid allocations -- its contents will be overwritten and235// not appended to.236func (lk LockTableKey) ToEngineKey(buf []byte) (EngineKey, []byte) {237 if len(lk.TxnUUID) != uuid.Size {238 panic("invalid TxnUUID")239 }240 if lk.Strength != lock.Exclusive {241 panic("unsupported lock strength")242 }243 // The first term in estimatedLen is for LockTableSingleKey.244 estimatedLen :=245 (len(keys.LocalRangeLockTablePrefix) + len(keys.LockTableSingleKeyInfix) + len(lk.Key) + 3) +246 engineKeyVersionLockTableLen247 if cap(buf) < estimatedLen {248 buf = make([]byte, 0, estimatedLen)249 }250 ltKey, buf := keys.LockTableSingleKey(lk.Key, buf)251 k := EngineKey{Key: ltKey}252 if cap(buf)-len(buf) >= engineKeyVersionLockTableLen {253 k.Version = buf[len(buf) : len(buf)+engineKeyVersionLockTableLen]254 } else {255 // estimatedLen was an underestimate.256 k.Version = make([]byte, engineKeyVersionLockTableLen)257 }258 k.Version[0] = byte(lk.Strength)259 copy(k.Version[1:], lk.TxnUUID)260 return k, buf261}...

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Len

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1import (2type Version struct {3}4func (v Version) Len() int {5}6func main() {7 v := Version{1, 2, 3}8}9import (10type Version struct {11}12func (v *Version) Len() int {13}14func main() {15 v := Version{1, 2, 3}16}17import (18type Version struct {19}20func (v *Version) Len() int {21}22func (v *Version) Len() int {23}24func main() {25 v := Version{1, 2, 3}26}27import (28type Version struct {29}30func (v *Version) Len() int {31}32type Version1 struct {33}34func (v *Version1) Len() int {

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1import "fmt"2func main() {3 fmt.Println(version.Len())4}5import "fmt"6func main() {7 fmt.Println(version.Len())8}9import "fmt"10func main() {11 fmt.Println(version.Len())12}13type Version struct {14}15func (v Version) Len() int {16}

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Len

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1import "fmt"2func main() {3 v := Version{1, 2, 3}4 fmt.Println(v.Len())5}6import "fmt"7func main() {8 v := Version{1, 2, 3}9 fmt.Println(v.Len())10}11import "fmt"12func main() {13 v := Version{1, 2, 3}14 fmt.Println(v.Len())15}16import "fmt"17func main() {18 v := Version{1, 2, 3}19 fmt.Println(v.Len())20}21import "fmt"22func main() {23 v := Version{1, 2, 3}24 fmt.Println(v.Len())25}26import "fmt"27func main() {28 v := Version{1, 2, 3}29 fmt.Println(v.Len())30}31import "fmt"32func main() {33 v := Version{1, 2, 3}34 fmt.Println(v.Len())35}36import "fmt"37func main() {38 v := Version{1, 2, 3}39 fmt.Println(v.Len())40}41import "fmt"42func main() {43 v := Version{1, 2, 3}44 fmt.Println(v.Len())45}46import "fmt"47func main() {48 v := Version{1, 2, 3}49 fmt.Println(v.Len())50}51import "fmt"52func main() {53 v := Version{1,

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1import "fmt"2func main() {3a := version{1, 2, 3}4fmt.Println(a.Len())5}6import "fmt"7func main() {8a := version{1, 2, 3}9fmt.Println(a.Len())10}11import "fmt"12func main() {13a := version{1, 2, 3}14fmt.Println(a.Len())15}16./1.go:8: a.Len undefined (type version has no field or method Len)17./2.go:8: a.Len undefined (type version has no field or method Len)18./3.go:8: a.Len undefined (type version has no field or method Len)19import "./version"

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1import (2func main() {3 v1 := Version{1, 2, 3}4 fmt.Println(v1.Len())5}6import (7func main() {8 v1 := Version{1, 2, 3}9 fmt.Println(v1.Len())10}11import (12func main() {13 v1 := Version{1, 2, 3}14 fmt.Println(v1.Len())15}16import (17func main() {18 v1 := Version{1, 2, 3}19 fmt.Println(v1.Len())20}21import (22func main() {23 v1 := Version{1, 2, 3}24 fmt.Println(v1.Len())25}26import (27func main() {28 v1 := Version{1, 2, 3}29 fmt.Println(v1.Len())30}31import (32func main() {33 v1 := Version{1, 2, 3}34 fmt.Println(v1.Len())35}36import (37func main() {38 v1 := Version{1, 2, 3}39 fmt.Println(v1.Len())40}41import (42func main() {43 v1 := Version{1, 2, 3}44 fmt.Println(v1.Len())45}46import (47func main() {48 v1 := Version{1, 2, 3}49 fmt.Println(v1.Len())50}

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1func main() {2 v1 = version{1, 2, 3}3 fmt.Println(v1.Len())4}5func main() {6 v1 = version{1, 2, 3}7 fmt.Println(v1.Len())8}9func main() {10 v1 = version{1, 2, 3}11 fmt.Println(v1.Len())12}13func main() {14 v1 = version{1, 2, 3}15 fmt.Println(v1.Len())16}17func main() {18 v1 = version{1, 2, 3}19 fmt.Println(v1.Len())20}21func main() {22 v1 = version{1, 2, 3}23 fmt.Println(v1.Len())24}25func main() {26 v1 = version{1, 2, 3}27 fmt.Println(v1.Len())28}29func main() {30 v1 = version{1, 2, 3}31 fmt.Println(v1.Len())32}33func main() {34 v1 = version{1, 2, 3}35 fmt.Println(v1.Len())36}37func main() {38 v1 = version{1, 2, 3}39 fmt.Println(v1.Len())40}41func main() {

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1import "fmt"2func main() {3 fmt.Println("Hello, playground")4 fmt.Println(Version{1, 2, 3}.Len())5}6import "fmt"7func main() {8 fmt.Println("Hello, playground")9 fmt.Println(Version{1, 2, 3}.Len())10}11import "fmt"12func main() {13 fmt.Println("Hello, playground")14 fmt.Println(Version{1, 2, 3}.Len())15}

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Len

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1import (2func (v Version) Len() int {3 return len(v)4}5func main() {6 v := Version{"1", "2", "3"}7 fmt.Println(v.Len())8}9import (10func (v *Version) Len() int {11 return len(*v)12}13func main() {14 v := Version{"1", "2", "3"}15 fmt.Println(v.Len())16}17import (18func (v *Version) Len() int {19 return len(*v)20}21func main() {22 v := &Version{"1", "2", "3"}23 fmt.Println(v.Len())24}25import (26func (v Version) Len() int {27 return len(v)28}29func main() {30 v := &Version{"1", "2", "3"}31 fmt.Println(v.Len())32}33import (34func (v Version) Len() int {35 return len(v)36}37func main() {38 v := Version{"

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Len

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1import (2func main() {3var v Version = Version{3, 2, 1}4fmt.Println(v.Len())5}6import (7func main() {8var v Version = Version{3, 2, 1}9fmt.Println(v.Len())10}11import (12func main() {13var v Version = Version{3, 2, 1}14fmt.Println(v.Len())15}16import (17func main() {18var v Version = Version{3, 2, 1}19fmt.Println(v.Len())20}21import (22func main() {23var v Version = Version{3, 2, 1}24fmt.Println(v.Len())25}26import (27func main() {28var v Version = Version{3, 2, 1}29fmt.Println(v.Len())30}31import (32func main() {33var v Version = Version{3, 2, 1}34fmt.Println(v.Len())35}36import (37func main() {38var v Version = Version{3, 2, 1}39fmt.Println(v.Len())40}41import (42func main() {43var v Version = Version{3, 2, 1}44fmt.Println(v.Len())45}46import (47func main() {48var v Version = Version{3, 2, 1}49fmt.Println(v.Len())50}51import (

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Len

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1import (2func main() {3 v1 = xyz.Version{Major: 1, Minor: 2, Patch: 3}4 fmt.Println(v1.Len())5}6import (7func main() {8 v1 = xyz.Version{Major: 1, Minor: 2, Patch: 3}9 fmt.Println(v1.Len())10}11import (12func main() {13 v1 = xyz.Version{Major: 1, Minor: 2, Patch: 3}14 fmt.Println(v1.Len())15}16import (17func main() {18 v1 = xyz.Version{Major: 1, Minor: 2, Patch: 3}19 fmt.Println(v1.Len())20}21import (22func main() {23 v1 = xyz.Version{Major: 1, Minor: 2, Patch: 3}24 fmt.Println(v1.Len())25}26import (27func main() {28 v1 = xyz.Version{Major: 1, Minor: 2, Patch: 3}29 fmt.Println(v1.Len())30}31import (32func main() {

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