Botan::ECDSA_Verification_Operation Class Reference

#include <ecdsa.h>

Inheritance diagram for Botan::ECDSA_Verification_Operation:

Public Member Functions
	ECDSA_Verification_Operation (const ECDSA_PublicKey &ecdsa)
size_t	max_input_bits () const
size_t	message_part_size () const
size_t	message_parts () const
bool	verify (const byte msg[], size_t msg_len, const byte sig[], size_t sig_len)
virtual SecureVector< byte >	verify_mr (const byte[], size_t)
bool	with_recovery () const

Detailed Description

ECDSA verification operation

Definition at line 117 of file ecdsa.h.

Constructor & Destructor Documentation

ECDSA_Verification_Operation()

Botan::ECDSA_Verification_Operation::ECDSA_Verification_Operation

(

const ECDSA_PublicKey &

ecdsa

)

Definition at line 65 of file ecdsa.cpp.

                                                                                       :
   base_point(ecdsa.domain().get_base_point()),
   public_point(ecdsa.public_point()),
   order(ecdsa.domain().get_order())
   {
   }

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

Member Function Documentation

max_input_bits()

size_t Botan::ECDSA_Verification_Operation::max_input_bits ( ) const

inlinevirtual

Get the maximum message size in bits supported by this public key.

Returns

maximum message in bits

Implements Botan::PK_Ops::Verification.

Definition at line 124 of file ecdsa.h.

{ return order.bits(); }

message_part_size()

size_t Botan::ECDSA_Verification_Operation::message_part_size ( ) const

inlinevirtual

Find out the message part size supported by this scheme/key.

Returns

size of the message parts

Reimplemented from Botan::PK_Ops::Verification.

Definition at line 123 of file ecdsa.h.

{ return order.bytes(); }

message_parts()

size_t Botan::ECDSA_Verification_Operation::message_parts ( ) const

inlinevirtual

Find out the number of message parts supported by this scheme.

Returns

number of message parts

Reimplemented from Botan::PK_Ops::Verification.

Definition at line 122 of file ecdsa.h.

{ return 2; }

verify()

bool Botan::ECDSA_Verification_Operation::verify ( const byte msg[], size_t msg_len, const byte sig[], size_t sig_len )

virtual

Reimplemented from Botan::PK_Ops::Verification.

Definition at line 72 of file ecdsa.cpp.

   {
   if(sig_len != order.bytes()*2)
      return false;
 
   BigInt e(msg, msg_len);
 
   BigInt r(sig, sig_len / 2);
   BigInt s(sig + sig_len / 2, sig_len / 2);
 
   if(r <= 0 || r >= order || s <= 0 || s >= order)
      return false;
 
   BigInt w = inverse_mod(s, order);
 
   PointGFp R = w * multi_exponentiate(base_point, e,
                                       public_point, r);
 
   if(R.is_zero())
      return false;
 
   return (R.get_affine_x() % order == r);
   }

References Botan::PointGFp::get_affine_x(), Botan::inverse_mod(), Botan::PointGFp::is_zero(), and Botan::multi_exponentiate().

verify_mr()

virtual SecureVector< byte > Botan::PK_Ops::Verification::verify_mr ( const byte [], size_t  )

inlinevirtualinherited

Reimplemented in Botan::NR_Verification_Operation, Botan::RSA_Public_Operation, and Botan::RW_Verification_Operation.

Definition at line 133 of file pk_ops.h.

         {
         throw Invalid_State("Message recovery not supported");
         }

with_recovery()

bool Botan::ECDSA_Verification_Operation::with_recovery ( ) const

inlinevirtual

Returns

boolean specifying if this key type supports message recovery and thus if you need to call verify() or verify_mr()

Implements Botan::PK_Ops::Verification.

Definition at line 126 of file ecdsa.h.

{ return false; }

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

• src/pubkey/ecdsa/ecdsa.h
• src/pubkey/ecdsa/ecdsa.cpp