Botan::RW_Verification_Operation Class Reference

#include <rw.h>

Inheritance diagram for Botan::RW_Verification_Operation:

Public Member Functions
size_t	max_input_bits () const
virtual size_t	message_part_size () const
virtual size_t	message_parts () const
	RW_Verification_Operation (const RW_PublicKey &rw)
virtual bool	verify (const byte[], size_t, const byte[], size_t)
SecureVector< byte >	verify_mr (const byte msg[], size_t msg_len)
bool	with_recovery () const

Detailed Description

Rabin-Williams Verification Operation

Definition at line 88 of file rw.h.

Constructor & Destructor Documentation

RW_Verification_Operation()

Botan::RW_Verification_Operation::RW_Verification_Operation ( const RW_PublicKey & rw )

inline

Definition at line 91 of file rw.h.

                                                        :
         n(rw.get_n()), powermod_e_n(rw.get_e(), rw.get_n())
         {}

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

Member Function Documentation

max_input_bits()

size_t Botan::RW_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 95 of file rw.h.

{ return (n.bits() - 1); }

message_part_size()

virtual size_t Botan::PK_Ops::Verification::message_part_size ( ) const

inlinevirtualinherited

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

Returns

size of the message parts

Reimplemented in Botan::DSA_Verification_Operation, Botan::ECDSA_Verification_Operation, and Botan::NR_Verification_Operation.

Definition at line 104 of file pk_ops.h.

{ return 0; }

message_parts()

virtual size_t Botan::PK_Ops::Verification::message_parts ( ) const

inlinevirtualinherited

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

Returns

number of message parts

Reimplemented in Botan::DSA_Verification_Operation, Botan::ECDSA_Verification_Operation, and Botan::NR_Verification_Operation.

Definition at line 98 of file pk_ops.h.

{ return 1; }

verify()

virtual bool Botan::PK_Ops::Verification::verify ( const byte [], size_t , const byte [], size_t  )

inlinevirtualinherited

Reimplemented in Botan::DSA_Verification_Operation, and Botan::ECDSA_Verification_Operation.

Definition at line 120 of file pk_ops.h.

         {
         throw Invalid_State("Message recovery required");
         }

verify_mr()

SecureVector< byte > Botan::RW_Verification_Operation::verify_mr ( const byte msg[], size_t msg_len )

virtual

Reimplemented from Botan::PK_Ops::Verification.

Definition at line 105 of file rw.cpp.

   {
   BigInt m(msg, msg_len);
 
   if((m > (n >> 1)) || m.is_negative())
      throw Invalid_Argument("RW signature verification: m > n / 2 || m < 0");
 
   BigInt r = powermod_e_n(m);
   if(r % 16 == 12)
      return BigInt::encode(r);
   if(r % 8 == 6)
      return BigInt::encode(2*r);
 
   r = n - r;
   if(r % 16 == 12)
      return BigInt::encode(r);
   if(r % 8 == 6)
      return BigInt::encode(2*r);
 
   throw Invalid_Argument("RW signature verification: Invalid signature");
   }

References Botan::BigInt::encode(), and Botan::BigInt::is_negative().

with_recovery()

bool Botan::RW_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 96 of file rw.h.

{ return true; }

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

• src/pubkey/rw/rw.h
• src/pubkey/rw/rw.cpp