1 files changed, 30 insertions, 0 deletions
diff --git a/pkg/types/crypto.go b/pkg/types/crypto.go
new file mode 100644
index 0000000..72152bf
--- /dev/null
+++ b/pkg/types/crypto.go
@@ -0,0 +1,30 @@
+package types
+
+import (
+	"crypto/ed25519"
+	"crypto/sha256"
+)
+
+const (
+	HashSize      = sha256.Size
+	SignatureSize = ed25519.SignatureSize
+	PublicKeySize = ed25519.PublicKeySize
+
+	InteriorNodePrefix = byte(0x00)
+	LeafNodePrefix     = byte(0x01)
+)
+
+type (
+	Hash      [HashSize]byte
+	Signature [SignatureSize]byte
+	PublicKey [PublicKeySize]byte
+)
+
+func HashFn(buf []byte) *Hash {
+	var hash Hash = sha256.Sum256(buf)
+	return &hash
+}
+
+func LeafHash(buf []byte) *Hash {
+	return HashFn(append([]byte{LeafNodePrefix}, buf...))
+}