Botan::ECDH_KA_Operation Class Reference

#include <ecdh.h>

Inheritance diagram for Botan::ECDH_KA_Operation:

Public Member Functions
SecureVector< byte >	agree (const byte w[], size_t w_len)
	ECDH_KA_Operation (const ECDH_PrivateKey &key)

Detailed Description

ECDH operation

Definition at line 93 of file ecdh.h.

Constructor & Destructor Documentation

ECDH_KA_Operation()

Botan::ECDH_KA_Operation::ECDH_KA_Operation

(

const ECDH_PrivateKey &

key

)

Definition at line 15 of file ecdh.cpp.

                                                               :
   curve(key.domain().get_curve()),
   cofactor(key.domain().get_cofactor())
   {
   l_times_priv = inverse_mod(cofactor, key.domain().get_order()) *
                  key.private_value();
   }

References Botan::EC_PublicKey::domain(), Botan::EC_Group::get_order(), Botan::inverse_mod(), and Botan::EC_PrivateKey::private_value().

Referenced by Botan::Core_Engine::get_key_agreement_op().

Member Function Documentation

agree()

SecureVector< byte > Botan::ECDH_KA_Operation::agree ( const byte w[], size_t w_len )

virtual

Implements Botan::PK_Ops::Key_Agreement.

Definition at line 23 of file ecdh.cpp.

   {
   PointGFp point = OS2ECP(w, w_len, curve);
 
   PointGFp S = (cofactor * point) * l_times_priv;
 
   BOTAN_ASSERT(S.on_the_curve(),
                "ECDH agreed value not on the curve");
 
   return BigInt::encode_1363(S.get_affine_x(),
                              curve.get_p().bytes());
   }

References BOTAN_ASSERT, Botan::BigInt::bytes(), Botan::BigInt::encode_1363(), Botan::PointGFp::get_affine_x(), Botan::PointGFp::on_the_curve(), and Botan::OS2ECP().

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The documentation for this class was generated from the following files:

• src/pubkey/ecdh/ecdh.h
• src/pubkey/ecdh/ecdh.cpp