1 files changed, 75 insertions, 0 deletions
diff --git a/src/lib/pubkey/xmss/xmss_common_ops.h b/src/lib/pubkey/xmss/xmss_common_ops.h
new file mode 100644
index 000000000..74ae52a78
--- /dev/null
+++ b/src/lib/pubkey/xmss/xmss_common_ops.h
@@ -0,0 +1,75 @@
+/**
+ * XMSS Common Ops
+ * (C) 2016 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/assert.h>
+#include <botan/xmss_parameters.h>
+#include <botan/xmss_address.h>
+#include <botan/xmss_hash.h>
+
+namespace Botan {
+
+typedef std::vector<secure_vector<byte>> wots_keysig_t;
+
+/**
+ * Operations shared by XMSS signature generation and verification operations.
+ **/
+class XMSS_Common_Ops
+   {
+   public:
+      XMSS_Common_Ops(XMSS_Parameters::xmss_algorithm_t oid)
+         : m_xmss_params(oid), m_hash(m_xmss_params.hash_function_name()) {};
+
+   protected:
+      /**
+        * Algorithm 7: "RAND_HASH"
+        *
+        * Generates a randomized hash.
+        *
+        * @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.
+        **/
+      void randomize_tree_hash(
+         secure_vector<byte>& result,
+         const secure_vector<byte>& left,
+         const secure_vector<byte>& right,
+         XMSS_Address& adrs,
+         const secure_vector<byte>& seed);
+
+      /**
+       * 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.
+       *
+       * @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.
+       **/
+      void create_l_tree(
+         secure_vector<byte>& result,
+         wots_keysig_t pk,
+         XMSS_Address& adrs,
+         const secure_vector<byte>& seed);
+
+   protected:
+      XMSS_Parameters m_xmss_params;
+      XMSS_Hash m_hash;
+
+   };
+
+}
+
+#endif