Botan::DH_KA_Operation Class Reference

#include <dh.h>

Inheritance diagram for Botan::DH_KA_Operation:

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

Detailed Description

DH operation

Definition at line 78 of file dh.h.

Constructor & Destructor Documentation

DH_KA_Operation()

Botan::DH_KA_Operation::DH_KA_Operation

(

const DH_PrivateKey &

key

)

Definition at line 79 of file dh.cpp.

                                                        :
   p(dh.group_p()), powermod_x_p(dh.get_x(), p)
   {
   BigInt k(global_state().global_rng(), p.bits() - 1);
   blinder = Blinder(k, powermod_x_p(inverse_mod(k, p)), p);
   }

References Botan::Blinder::Blinder(), Botan::global_state(), and Botan::inverse_mod().

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

Member Function Documentation

agree()

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

virtual

Implements Botan::PK_Ops::Key_Agreement.

Definition at line 86 of file dh.cpp.

   {
   BigInt input = BigInt::decode(w, w_len);
 
   if(input <= 1 || input >= p - 1)
      throw Invalid_Argument("DH agreement - invalid key provided");
 
   BigInt r = blinder.unblind(powermod_x_p(blinder.blind(input)));
 
   return BigInt::encode_1363(r, p.bytes());
   }

References Botan::BigInt::bytes(), Botan::BigInt::decode(), and Botan::BigInt::encode_1363().

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

• src/pubkey/dh/dh.h
• src/pubkey/dh/dh.cpp