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diff --git a/comm/third_party/botan/src/lib/pubkey/xmss/xmss_common_ops.h b/comm/third_party/botan/src/lib/pubkey/xmss/xmss_common_ops.h
new file mode 100644
index 0000000000..77fdc9dc1e
--- /dev/null
+++ b/comm/third_party/botan/src/lib/pubkey/xmss/xmss_common_ops.h
@@ -0,0 +1,83 @@
+/*
+ * XMSS Common Ops
+ * (C) 2016,2017 Matthias Gierlings
+ *
+ * Botan is released under the Simplified BSD License (see license.txt)
+ **/
+
+#ifndef BOTAN_XMSS_COMMON_OPS_H_
+#define BOTAN_XMSS_COMMON_OPS_H_
+
+#include <vector>
+#include <botan/secmem.h>
+#include <botan/xmss_parameters.h>
+#include <botan/internal/xmss_address.h>
+#include <botan/xmss_hash.h>
+
+BOTAN_FUTURE_INTERNAL_HEADER(xmss_common_ops.h)
+
+namespace Botan {
+
+typedef std::vector<secure_vector<uint8_t>> wots_keysig_t;
+
+/**
+ * Operations shared by XMSS signature generation and verification operations.
+ **/
+class XMSS_Common_Ops
+   {
+   public:
+      /**
+        * Algorithm 7: "RAND_HASH"
+        *
+        * Generates a randomized hash.
+        *
+        * This overload is used in multithreaded scenarios, where it is
+        * required to provide seperate instances of XMSS_Hash to each
+        * thread.
+        *
+        * @param[out] result The resulting randomized hash.
+        * @param[in] left Left half of the hash function input.
+        * @param[in] right Right half of the hash function input.
+        * @param[in] adrs Adress of the hash function call.
+        * @param[in] seed The seed for G.
+        * @param[in] hash Instance of XMSS_Hash, that may only by the thead
+        *            executing generate_public_key.
+        * @param[in] params
+        **/
+      static void randomize_tree_hash(
+         secure_vector<uint8_t>& result,
+         const secure_vector<uint8_t>& left,
+         const secure_vector<uint8_t>& right,
+         XMSS_Address& adrs,
+         const secure_vector<uint8_t>& seed,
+         XMSS_Hash& hash,
+         const XMSS_Parameters& params);
+
+      /**
+       * Algorithm 8: "ltree"
+       * Create an L-tree used to compute the leaves of the binary hash tree.
+       * Takes a WOTS+ public key and compresses it to a single n-byte value.
+       *
+       * This overload is used in multithreaded scenarios, where it is
+       * required to provide seperate instances of XMSS_Hash to each thread.
+       *
+       * @param[out] result Public key compressed to a single n-byte value
+       *             pk[0].
+       * @param[in] pk Winternitz One Time Signatures+ public key.
+       * @param[in] adrs Address encoding the address of the L-Tree
+       * @param[in] seed The seed generated during the public key generation.
+       * @param[in] hash Instance of XMSS_Hash, that may only be used by the
+       *            thead executing create_l_tree.
+       * @param[in] params
+      **/
+      static void create_l_tree(secure_vector<uint8_t>& result,
+                                wots_keysig_t pk,
+                                XMSS_Address& adrs,
+                                const secure_vector<uint8_t>& seed,
+                                XMSS_Hash& hash,
+                                const XMSS_Parameters& params);
+   };
+
+}
+
+#endif