Implements changes from XMSS review

- Removes custom XMSS_Hash assignment operator.
- Changes mutex type used in XMSS_Index_Registryfrom std::mutex to
  Botan::mutex_type, changes lock_guard accordingly.
- Removes singleton and endianess detection from XMSS_Tools, changes
  XMSS_Tools::concat() to be a static method.
- XMSS/XMSS_WOTS check_key() now always returns true.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/lib/pubkey/xmss/xmss_signature_operation.cpp b/src/lib/pubkey/xmss/xmss_signature_operation.cpp
index d223ddef0..07121db14 100644
--- a/src/lib/pubkey/xmss/xmss_signature_operation.cpp
+++ b/src/lib/pubkey/xmss/xmss_signature_operation.cpp
@@ -97,10 +97,10 @@ void XMSS_Signature_Operation::initialize()
    m_leaf_idx = m_priv_key.reserve_unused_leaf_index();
 
    // write prefix for message hashing into buffer.
-   XMSS_Tools::get().concat(index_bytes, m_leaf_idx, 32);
+   XMSS_Tools::concat(index_bytes, m_leaf_idx, 32);
    m_randomness = m_hash.prf(m_priv_key.prf(), index_bytes);
    index_bytes.clear();
-   XMSS_Tools::get().concat(index_bytes, m_leaf_idx,
+   XMSS_Tools::concat(index_bytes, m_leaf_idx,
                             m_priv_key.xmss_parameters().element_size());
    m_hash.h_msg_init(m_randomness,
                      m_priv_key.root(),