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-rw-r--r--internal/utils/utils.go56
1 files changed, 56 insertions, 0 deletions
diff --git a/internal/utils/utils.go b/internal/utils/utils.go
new file mode 100644
index 0000000..7f5b1bc
--- /dev/null
+++ b/internal/utils/utils.go
@@ -0,0 +1,56 @@
+package utils
+
+import (
+ "crypto/sha256"
+ "fmt"
+ "os"
+
+ "git.cs.kau.se/rasmoste/ct-sans/internal/merkle"
+ "gitlab.torproject.org/rgdd/ct/pkg/metadata"
+)
+
+// Logs select logs that count towards CT-compliance checks. Logs that don't
+// have a description are skipped after printing a warning.
+func Logs(md metadata.Metadata) (logs []metadata.Log) {
+ for _, operators := range md.Operators {
+ for _, log := range operators.Logs {
+ if log.Description == nil {
+ fmt.Fprintf(os.Stderr, "WARNING: skipping log without description")
+ continue
+ }
+ if log.State == nil {
+ continue // skip logs with unknown states
+ }
+ if log.State.Name == metadata.LogStatePending {
+ continue // pending logs do not count towards CT-compliance
+ }
+ if log.State.Name == metadata.LogStateRetired {
+ continue // retired logs are not necessarily reachable
+ }
+ if log.State.Name == metadata.LogStateRejected {
+ continue // rejected logs do not count towards CT-compliance
+ }
+
+ logs = append(logs, log)
+ }
+ }
+ return
+}
+
+// Proof formats hashes so that they can be passed to the merkle package
+func Proof(hashes [][]byte) (p [][sha256.Size]byte) {
+ for _, hash := range hashes {
+ var h [sha256.Size]byte
+ copy(h[:], hash)
+ p = append(p, h)
+ }
+ return
+}
+
+// LeafHashes formats a list of data as leaf hashes
+func LeafHashes(data [][]byte) (lh [][sha256.Size]byte) {
+ for _, d := range data {
+ lh = append(lh, merkle.HashLeafNode(d))
+ }
+ return
+}