1 files changed, 51 insertions, 0 deletions
diff --git a/include/dl_group.h b/include/dl_group.h
new file mode 100644
index 000000000..28161023e
--- /dev/null
+++ b/include/dl_group.h
@@ -0,0 +1,51 @@
+/*************************************************
+* Discrete Logarithm Group Header File           *
+* (C) 1999-2006 The Botan Project                *
+*************************************************/
+
+#ifndef BOTAN_DL_PARAM_H__
+#define BOTAN_DL_PARAM_H__
+
+#include <botan/bigint.h>
+#include <botan/data_src.h>
+
+namespace Botan {
+
+/*************************************************
+* Discrete Logarithm Group                       *
+*************************************************/
+class DL_Group
+   {
+   public:
+      const BigInt& get_p() const;
+      const BigInt& get_q() const;
+      const BigInt& get_g() const;
+
+      enum Format { ANSI_X9_42, ANSI_X9_57, PKCS_3 };
+      enum PrimeType { Strong, Prime_Subgroup, DSA_Kosherizer };
+
+      bool verify_group(bool) const;
+
+      std::string PEM_encode(Format) const;
+      SecureVector<byte> DER_encode(Format) const;
+      void BER_decode(DataSource&, Format);
+      void PEM_decode(DataSource&);
+
+      static BigInt make_dsa_generator(const BigInt&, const BigInt&);
+
+      DL_Group();
+      DL_Group(const std::string&);
+      DL_Group(u32bit, PrimeType = Strong);
+      DL_Group(const MemoryRegion<byte>&, u32bit = 1024, u32bit = 0);
+      DL_Group(const BigInt&, const BigInt&);
+      DL_Group(const BigInt&, const BigInt&, const BigInt&);
+   private:
+      void init_check() const;
+      void initialize(const BigInt&, const BigInt&, const BigInt&);
+      bool initialized;
+      BigInt p, q, g;
+   };
+
+}
+
+#endif