Merge branch 'design' into main

1 files changed, 33 insertions, 0 deletions

diff --git a/pkg/trillian/util.go b/pkg/trillian/util.go
new file mode 100644
index 0000000..4cf31fb
--- /dev/null
+++ b/pkg/trillian/util.go
@@ -0,0 +1,33 @@
+package trillian
+
+import (
+	"fmt"
+
+	trillian "github.com/google/trillian/types"
+	siglog "github.com/system-transparency/stfe/pkg/types"
+)
+
+func treeHeadFromLogRoot(lr *trillian.LogRootV1) *siglog.TreeHead {
+	var hash [siglog.HashSize]byte
+	th := siglog.TreeHead{
+		Timestamp: uint64(lr.TimestampNanos / 1000 / 1000 / 1000),
+		TreeSize:  uint64(lr.TreeSize),
+		RootHash:  &hash,
+	}
+	copy(th.RootHash[:], lr.RootHash)
+	return &th
+}
+
+func nodePathFromHashes(hashes [][]byte) ([]*[siglog.HashSize]byte, error) {
+	var path []*[siglog.HashSize]byte
+	for _, hash := range hashes {
+		if len(hash) != siglog.HashSize {
+			return nil, fmt.Errorf("unexpected hash length: %v", len(hash))
+		}
+
+		var h [siglog.HashSize]byte
+		copy(h[:], hash)
+		path = append(path, &h)
+	}
+	return path, nil
+}