1 files changed, 102 insertions, 0 deletions
diff --git a/src/pubkey/ecdh/ecdh.h b/src/pubkey/ecdh/ecdh.h
new file mode 100644
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+++ b/src/pubkey/ecdh/ecdh.h
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+/*
+* ECDH
+* (C) 2007 Falko Strenzke, FlexSecure GmbH
+*          Manuel Hartl, FlexSecure GmbH
+* (C) 2008-2010 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_ECDH_KEY_H__
+#define BOTAN_ECDH_KEY_H__
+
+#include <botan/ecc_key.h>
+
+namespace Botan {
+
+/**
+* This class represents ECDH Public Keys.
+*/
+class BOTAN_DLL ECDH_PublicKey : public virtual EC_PublicKey
+   {
+   public:
+
+      /**
+      * Default constructor. Use this one if you want to later fill
+      * this object with data from an encoded key.
+      */
+      ECDH_PublicKey() {}
+
+      /**
+      * Construct a public key from a given public point.
+      * @param dom_par the domain parameters associated with this key
+      * @param public_point the public point defining this key
+      */
+      ECDH_PublicKey(const EC_Domain_Params& dom_par,
+                     const PointGFp& public_point) :
+         EC_PublicKey(dom_par, public_point) {}
+
+      /**
+      * Get this keys algorithm name.
+      * @result this keys algorithm name
+      */
+      std::string algo_name() const { return "ECDH"; }
+
+      /**
+      * Get the maximum number of bits allowed to be fed to this key.
+      * This is the bitlength of the order of the base point.
+
+      * @result the maximum number of input bits
+      */
+      u32bit max_input_bits() const { return domain().get_order().bits(); }
+   };
+
+/**
+* This class represents ECDH Private Keys.
+*/
+class BOTAN_DLL ECDH_PrivateKey : public ECDH_PublicKey,
+                                  public EC_PrivateKey,
+                                  public PK_Key_Agreement_Key
+   {
+   public:
+
+      /**
+      * Default constructor. Use this one if you want to later fill
+      * this object with data from an encoded key.
+      */
+      ECDH_PrivateKey() {}
+
+      /**
+      * Generate a new private key
+      * @param the domain parameters to used for this key
+      */
+      ECDH_PrivateKey(RandomNumberGenerator& rng,
+                      const EC_Domain_Params& domain) :
+         EC_PrivateKey(rng, domain) {}
+
+      MemoryVector<byte> public_value() const
+         { return EC2OSP(public_point(), PointGFp::UNCOMPRESSED); }
+
+      /**
+      * Derive a shared key with the other parties public key.
+      * @param key the other partys public key
+      * @param key_len the other partys public key
+      */
+      SecureVector<byte> derive_key(const byte key[], u32bit key_len) const;
+
+      /**
+      * Derive a shared key with the other parties public key.
+      * @param other the other partys public key
+      */
+      SecureVector<byte> derive_key(const ECDH_PublicKey& other) const;
+
+      /**
+      * Derive a shared key with the other parties public key.
+      * @param point the public point of the other parties key
+      */
+      SecureVector<byte> derive_key(const PointGFp& point) const;
+   };
+
+}
+
+#endif