      DSA_Signature_Operation(const DSA_PrivateKey& dsa,
                              const std::string& emsa,
                              RandomNumberGenerator& rng) :
         PK_Ops::Signature_with_EMSA(emsa),
         m_group(dsa.get_group()),
         m_x(dsa.get_x()),
         m_mod_q(dsa.group_q())
         {
#if defined(BOTAN_HAS_RFC6979_GENERATOR)
         m_rfc6979_hash = hash_for_emsa(emsa);
#endif

         m_b = BigInt::random_integer(rng, 2, dsa.group_q());
         m_b_inv = inverse_mod(m_b, dsa.group_q());
         }
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