Botan::EMSA1 Class Reference

#include <emsa1.h>

Inheritance diagram for Botan::EMSA1:

Public Member Functions
EMSA *	clone () override
AlgorithmIdentifier	config_for_x509 (const Private_Key &key, const std::string &cert_hash_name) const override
	EMSA1 (HashFunction *hash)
std::string	name () const override

Detailed Description

EMSA1 from IEEE 1363 Essentially, sign the hash directly

Definition at line 22 of file emsa1.h.

Constructor & Destructor Documentation

Botan::EMSA1::EMSA1 ( HashFunction *  hash )

inlineexplicit

Parameters

hash	the hash function to use

Definition at line 28 of file emsa1.h.

Referenced by clone().

: m_hash(hash) {}

Member Function Documentation

EMSA * Botan::EMSA1::clone ( )

overridevirtual

Returns

a new object representing the same encoding method as *this

Implements Botan::EMSA.

Definition at line 51 of file emsa1.cpp.

References EMSA1().

   {
   return new EMSA1(m_hash->clone());
   }

AlgorithmIdentifier Botan::EMSA1::config_for_x509 ( const Private_Key &  key, const std::string &  cert_hash_name  ) const

overridevirtual

Prepare sig_algo for use in choose_sig_format for x509 certs

Parameters

key	used for checking compatibility with the encoding scheme
cert_hash_name	is checked to equal the hash for the encoding

Returns

algorithm identifier to signatures created using this key, padding method and hash.

Reimplemented from Botan::EMSA.

Definition at line 98 of file emsa1.cpp.

References Botan::Public_Key::algo_name(), Botan::Public_Key::algorithm_identifier(), Botan::OID::from_string(), Botan::AlgorithmIdentifier::get_parameters(), name(), and Botan::sig_algo_and_pad_ok().

   {
   if(cert_hash_name != m_hash->name())
      throw Invalid_Argument("Hash function from opts and hash_fn argument"
         " need to be identical");
   // check that the signature algorithm and the padding scheme fit
   if(!sig_algo_and_pad_ok(key.algo_name(), "EMSA1"))
      {
      throw Invalid_Argument("Encoding scheme with canonical name EMSA1"
         " not supported for signature algorithm " + key.algo_name());
      }

   const OID oid = OID::from_string(key.algo_name() + "/" + name());

   const std::string algo_name = key.algo_name();
   std::vector<uint8_t> parameters;
   if(algo_name == "DSA" ||
      algo_name == "ECDSA" ||
      algo_name == "ECGDSA" ||
      algo_name == "ECKCDSA" ||
      algo_name == "GOST-34.10" ||
      algo_name == "GOST-34.10-2012-256" ||
      algo_name == "GOST-34.10-2012-512")
      {
      // for DSA, ECDSA, GOST parameters "SHALL" be empty
      }
   else
      {
      parameters = key.algorithm_identifier().get_parameters();
      }

   return AlgorithmIdentifier(oid, parameters);
   }

std::string Botan::EMSA1::name ( ) const

overridevirtual

Returns

the SCAN name of the encoding/padding scheme

Implements Botan::EMSA.

Definition at line 46 of file emsa1.cpp.

Referenced by config_for_x509().

   {
   return "EMSA1(" + m_hash->name() + ")";
   }

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

• src/lib/pk_pad/emsa1/emsa1.h
• src/lib/pk_pad/emsa1/emsa1.cpp