Botan::PK_Ops::Signature_with_EMSA Class Reference

#include <pk_ops_impl.h>

Inheritance diagram for Botan::PK_Ops::Signature_with_EMSA:

Public Member Functions
secure_vector< uint8_t >	sign (RandomNumberGenerator &rng) override
virtual size_t	signature_length () const =0
void	update (const uint8_t msg[], size_t msg_len) override

Protected Member Functions
std::unique_ptr< EMSA >	clone_emsa () const
virtual bool	has_prefix ()
std::string	hash_for_signature ()
virtual secure_vector< uint8_t >	message_prefix () const
	Signature_with_EMSA (const std::string &emsa, bool with_message_recovery=false)
	~Signature_with_EMSA ()=default

Detailed Description

Definition at line 124 of file pk_ops_impl.h.

Constructor & Destructor Documentation

Signature_with_EMSA()

Botan::PK_Ops::Signature_with_EMSA::Signature_with_EMSA ( const std::string &  emsa, bool  with_message_recovery = false  )

explicitprotected

Definition at line 62 of file pk_ops.cpp.

                                                                                                :
   Signature(),
   m_emsa(EMSA::create_or_throw(emsa)),
   m_hash(hash_for_emsa(emsa)),
   m_prefix_used(false)
   {
   if(!with_message_recovery && m_emsa->requires_message_recovery())
      {
      throw Invalid_Argument("Signature padding method " + emsa +
                             " requires message recovery, which is not supported by this scheme");
      }
   }

~Signature_with_EMSA()

Botan::PK_Ops::Signature_with_EMSA::~Signature_with_EMSA ( )

protecteddefault

Member Function Documentation

clone_emsa()

std::unique_ptr< EMSA > Botan::PK_Ops::Signature_with_EMSA::clone_emsa ( ) const

inlineprotected

Definition at line 149 of file pk_ops_impl.h.

{ return m_emsa->new_object(); }

has_prefix()

virtual bool Botan::PK_Ops::Signature_with_EMSA::has_prefix ( )

inlineprotectedvirtual

Returns

boolean specifying if this signature scheme uses a message prefix returned by message_prefix()

Definition at line 141 of file pk_ops_impl.h.

{ return false; }

hash_for_signature()

std::string Botan::PK_Ops::Signature_with_EMSA::hash_for_signature ( )

inlineprotected

Definition at line 135 of file pk_ops_impl.h.

{ return m_hash; }

message_prefix()

virtual secure_vector< uint8_t > Botan::PK_Ops::Signature_with_EMSA::message_prefix ( ) const

inlineprotectedvirtual

Returns

the message prefix if this signature scheme uses a message prefix, signaled via has_prefix()

Definition at line 147 of file pk_ops_impl.h.

{ throw Invalid_State("No prefix"); }

sign()

secure_vector< uint8_t > Botan::PK_Ops::Signature_with_EMSA::sign ( RandomNumberGenerator &  rng )

overridevirtual

Implements Botan::PK_Ops::Signature.

Definition at line 86 of file pk_ops.cpp.

   {
   m_prefix_used = false;
   const secure_vector<uint8_t> msg = m_emsa->raw_data();
   const auto padded = m_emsa->encoding_of(msg, this->max_input_bits(), rng);
   return raw_sign(padded.data(), padded.size(), rng);
   }

signature_length()

virtual size_t Botan::PK_Ops::Signature::signature_length ( ) const

pure virtualinherited

Implemented in Botan::XMSS_Signature_Operation.

update()

void Botan::PK_Ops::Signature_with_EMSA::update ( const uint8_t  msg[], size_t  msg_len  )

overridevirtual

Implements Botan::PK_Ops::Signature.

Definition at line 75 of file pk_ops.cpp.

   {
   if(has_prefix() && !m_prefix_used)
      {
      m_prefix_used = true;
      secure_vector<uint8_t> prefix = message_prefix();
      m_emsa->update(prefix.data(), prefix.size());
      }
   m_emsa->update(msg, msg_len);
   }

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

• src/lib/pubkey/pk_ops_impl.h
• src/lib/pubkey/pk_ops.cpp