2 files changed, 11 insertions, 0 deletions
diff --git a/contrib/epee/include/hex.h b/contrib/epee/include/hex.h
index d9eb93d51..d27c127c1 100644
--- a/contrib/epee/include/hex.h
+++ b/contrib/epee/include/hex.h
@@ -67,6 +67,9 @@ namespace epee
       return out;
     }
 
+    //! Write `src` as hex to `out`. `out` must be exactly 2x in size.
+    static bool buffer(span<char> out, const span<const std::uint8_t> src) noexcept;
+
     //! Append `src` as hex to `out`.
     static void buffer(std::ostream& out, const span<const std::uint8_t> src);
 
diff --git a/contrib/epee/src/hex.cpp b/contrib/epee/src/hex.cpp
index edc7d46f4..625f37c2f 100644
--- a/contrib/epee/src/hex.cpp
+++ b/contrib/epee/src/hex.cpp
@@ -69,6 +69,14 @@ namespace epee
   std::string to_hex::string(const span<const std::uint8_t> src) { return convert<std::string>(src); }
   epee::wipeable_string to_hex::wipeable_string(const span<const std::uint8_t> src) { return convert<epee::wipeable_string>(src); }
 
+  bool to_hex::buffer(span<char> out, const span<const std::uint8_t> src) noexcept
+  {
+    if (out.size() % 2 != 0 || out.size() / 2 != src.size())
+      return false;
+    to_hex::buffer_unchecked(out.data(), src);
+    return true;
+  }
+
   void to_hex::buffer(std::ostream& out, const span<const std::uint8_t> src)
   {
     write_hex(std::ostreambuf_iterator<char>{out}, src);