Use ct.SHA256Hash for log ID rather than []byte

cmd/state.go

@@ -162,7 +162,7 @@ func (state *State) SaveCert(isPrecert bool, certs [][]byte) (bool, string, erro
 }
 
 func (state *State) OpenLogState(logInfo *loglist.Log) (*LogState, error) {
-	return OpenLogState(filepath.Join(state.path, "logs", base64.RawURLEncoding.EncodeToString(logInfo.LogID)))
+	return OpenLogState(filepath.Join(state.path, "logs", base64.RawURLEncoding.EncodeToString(logInfo.LogID[:])))
 }
 
 func (state *State) GetLegacySTH(logInfo *loglist.Log) (*ct.SignedTreeHead, error) {

loglist/helpers.go

@@ -10,7 +10,6 @@
 package loglist
 
 import (
-	"encoding/base64"
 	"time"
 )
 
@@ -25,7 +24,7 @@ func (list *List) AllLogs() []*Log {
 }
 
 func (log *Log) LogIDString() string {
-	return base64.StdEncoding.EncodeToString(log.LogID)
+	return log.LogID.Base64String()
 }
 
 func (log *Log) AcceptsExpiration(expiration time.Time) bool {

loglist/schema.go

@@ -11,6 +11,8 @@ package loglist
 
 import (
 	"time"
+
+	"software.sslmate.com/src/certspotter/ct"
 )
 
 type List struct {
@@ -26,7 +28,7 @@ type Operator struct {
 
 type Log struct {
 	Key              []byte        `json:"key"`
-	LogID            []byte  `json:"log_id"`
+	LogID            ct.SHA256Hash `json:"log_id"`
 	MMD              int           `json:"mmd"`
 	URL              string        `json:"url"`
 	Description      string        `json:"description"`

loglist/validate.go

@@ -10,7 +10,6 @@
 package loglist
 
 import (
-	"bytes"
 	"crypto/sha256"
 	"fmt"
 )
@@ -35,7 +34,7 @@ func (operator *Operator) Validate() error {
 
 func (log *Log) Validate() error {
 	realLogID := sha256.Sum256(log.Key)
-	if !bytes.Equal(log.LogID, realLogID[:]) {
+	if log.LogID != realLogID {
 		return fmt.Errorf("log ID does not match log key")
 	}
 	return nil

scanner.go

@@ -63,7 +63,7 @@ type Scanner struct {
 
 	// Public key of the log
 	publicKey crypto.PublicKey
-	LogId     []byte
+	LogId     ct.SHA256Hash
 
 	// Client used to talk to the CT log instance
 	logClient *client.LogClient
@@ -207,7 +207,7 @@ func (s *Scanner) GetSTH() (*ct.SignedTreeHead, error) {
 			return nil, errors.New("STH signature is invalid: " + err.Error())
 		}
 	}
-	copy(latestSth.LogID[:], s.LogId)
+	latestSth.LogID = s.LogId
 	return latestSth, nil
 }
 
@@ -311,7 +311,7 @@ func (s *Scanner) Scan(startIndex int64, endIndex int64, processCert ProcessCall
 
 // Creates a new Scanner instance using |client| to talk to the log, and taking
 // configuration options from |opts|.
-func NewScanner(logUri string, logId []byte, publicKey crypto.PublicKey, opts *ScannerOptions) *Scanner {
+func NewScanner(logUri string, logId ct.SHA256Hash, publicKey crypto.PublicKey, opts *ScannerOptions) *Scanner {
 	var scanner Scanner
 	scanner.LogUri = logUri
 	scanner.LogId = logId