1 files changed, 13 insertions, 0 deletions
diff --git a/src/crypto/hash.h b/src/crypto/hash.h
index 22991e513..610b4502f 100644
--- a/src/crypto/hash.h
+++ b/src/crypto/hash.h
@@ -31,9 +31,13 @@
 #pragma once
 
 #include <stddef.h>
+#include <iostream>
+#include <boost/utility/value_init.hpp>
 
 #include "common/pod-class.h"
 #include "generic-ops.h"
+#include "hex.h"
+#include "span.h"
 
 namespace crypto {
 
@@ -75,6 +79,15 @@ namespace crypto {
     tree_hash(reinterpret_cast<const char (*)[HASH_SIZE]>(hashes), count, reinterpret_cast<char *>(&root_hash));
   }
 
+  inline std::ostream &operator <<(std::ostream &o, const crypto::hash &v) {
+    epee::to_hex::formatted(o, epee::as_byte_span(v)); return o;
+  }
+  inline std::ostream &operator <<(std::ostream &o, const crypto::hash8 &v) {
+    epee::to_hex::formatted(o, epee::as_byte_span(v)); return o;
+  }
+
+  const static crypto::hash null_hash = boost::value_initialized<crypto::hash>();
+  const static crypto::hash8 null_hash8 = boost::value_initialized<crypto::hash8>();
 }
 
 CRYPTO_MAKE_HASHABLE(hash)