Add DL_Group::monty_params_p to get Montgomery params

2 files changed, 13 insertions, 2 deletions

diff --git a/src/lib/pubkey/dl_group/dl_group.cpp b/src/lib/pubkey/dl_group/dl_group.cpp
index 9bd9d2462..7a35c6362 100644
--- a/src/lib/pubkey/dl_group/dl_group.cpp
+++ b/src/lib/pubkey/dl_group/dl_group.cpp
@@ -45,7 +45,7 @@ class DL_Group_Data final
          return m_mod_p.multiply(x, y);
          }
 
-      std::shared_ptr<const Montgomery_Params> monty_params() const
+      std::shared_ptr<const Montgomery_Params> monty_params_p() const
          { return m_monty_params; }
 
       size_t p_bits() const { return m_p_bits; }
@@ -394,6 +394,11 @@ const BigInt& DL_Group::get_q() const
    return data().q();
    }
 
+std::shared_ptr<const Montgomery_Params> DL_Group::monty_params_p() const
+   {
+   return data().monty_params_p();
+   }
+
 size_t DL_Group::p_bits() const
    {
    return data().p_bits();
@@ -427,7 +432,7 @@ BigInt DL_Group::multiply_mod_p(const BigInt& x, const BigInt& y) const
 
 BigInt DL_Group::multi_exponentiate(const BigInt& x, const BigInt& y, const BigInt& z) const
    {
-   return monty_multi_exp(data().monty_params(), get_g(), x, y, z);
+   return monty_multi_exp(data().monty_params_p(), get_g(), x, y, z);
    }
 
 BigInt DL_Group::power_g_p(const BigInt& x) const
diff --git a/src/lib/pubkey/dl_group/dl_group.h b/src/lib/pubkey/dl_group/dl_group.h
index 14ef3c088..921b4060e 100644
--- a/src/lib/pubkey/dl_group/dl_group.h
+++ b/src/lib/pubkey/dl_group/dl_group.h
@@ -12,6 +12,7 @@
 
 namespace Botan {
 
+class Montgomery_Params;
 class DL_Group_Data;
 
 /**
@@ -193,6 +194,11 @@ class BOTAN_PUBLIC_API(2,0) DL_Group final
       BigInt multi_exponentiate(const BigInt& x, const BigInt& y, const BigInt& z) const;
 
       /**
+      * Return parameters for Montgomery reduction/exponentiation mod p
+      */
+      std::shared_ptr<const Montgomery_Params> monty_params_p() const;
+
+      /**
       * Return the size of p in bits
       * Same as get_p().bits()
       */