1 files changed, 104 insertions, 0 deletions
diff --git a/src/lib/pubkey/nr/nr.h b/src/lib/pubkey/nr/nr.h
new file mode 100644
index 000000000..5be336a21
--- /dev/null
+++ b/src/lib/pubkey/nr/nr.h
@@ -0,0 +1,104 @@
+/*
+* Nyberg-Rueppel
+* (C) 1999-2010 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_NYBERG_RUEPPEL_H__
+#define BOTAN_NYBERG_RUEPPEL_H__
+
+#include <botan/dl_algo.h>
+#include <botan/pk_ops.h>
+#include <botan/numthry.h>
+#include <botan/reducer.h>
+
+namespace Botan {
+
+/**
+* Nyberg-Rueppel Public Key
+*/
+class BOTAN_DLL NR_PublicKey : public virtual DL_Scheme_PublicKey
+   {
+   public:
+      std::string algo_name() const { return "NR"; }
+
+      DL_Group::Format group_format() const { return DL_Group::ANSI_X9_57; }
+
+      size_t message_parts() const { return 2; }
+      size_t message_part_size() const { return group_q().bytes(); }
+      size_t max_input_bits() const { return (group_q().bits() - 1); }
+
+      NR_PublicKey(const AlgorithmIdentifier& alg_id,
+                   const secure_vector<byte>& key_bits);
+
+      NR_PublicKey(const DL_Group& group, const BigInt& pub_key);
+   protected:
+      NR_PublicKey() {}
+   };
+
+/**
+* Nyberg-Rueppel Private Key
+*/
+class BOTAN_DLL NR_PrivateKey : public NR_PublicKey,
+                                public virtual DL_Scheme_PrivateKey
+   {
+   public:
+      bool check_key(RandomNumberGenerator& rng, bool strong) const;
+
+      NR_PrivateKey(const AlgorithmIdentifier& alg_id,
+                    const secure_vector<byte>& key_bits,
+                    RandomNumberGenerator& rng);
+
+      NR_PrivateKey(RandomNumberGenerator& rng,
+                    const DL_Group& group,
+                    const BigInt& x = 0);
+   };
+
+/**
+* Nyberg-Rueppel signature operation
+*/
+class BOTAN_DLL NR_Signature_Operation : public PK_Ops::Signature
+   {
+   public:
+      NR_Signature_Operation(const NR_PrivateKey& nr);
+
+      size_t message_parts() const { return 2; }
+      size_t message_part_size() const { return q.bytes(); }
+      size_t max_input_bits() const { return (q.bits() - 1); }
+
+      secure_vector<byte> sign(const byte msg[], size_t msg_len,
+                              RandomNumberGenerator& rng);
+   private:
+      const BigInt& q;
+      const BigInt& x;
+      Fixed_Base_Power_Mod powermod_g_p;
+      Modular_Reducer mod_q;
+   };
+
+/**
+* Nyberg-Rueppel verification operation
+*/
+class BOTAN_DLL NR_Verification_Operation : public PK_Ops::Verification
+   {
+   public:
+      NR_Verification_Operation(const NR_PublicKey& nr);
+
+      size_t message_parts() const { return 2; }
+      size_t message_part_size() const { return q.bytes(); }
+      size_t max_input_bits() const { return (q.bits() - 1); }
+
+      bool with_recovery() const { return true; }
+
+      secure_vector<byte> verify_mr(const byte msg[], size_t msg_len);
+   private:
+      const BigInt& q;
+      const BigInt& y;
+
+      Fixed_Base_Power_Mod powermod_g_p, powermod_y_p;
+      Modular_Reducer mod_p, mod_q;
+   };
+
+}
+
+#endif