Botan::EMSA3 Class Reference

#include <emsa3.h>

Inheritance diagram for Botan::EMSA3:

Public Member Functions
	EMSA3 (HashFunction *hash)
SecureVector< byte >	encoding_of (const MemoryRegion< byte > &, size_t, RandomNumberGenerator &rng)
SecureVector< byte >	raw_data ()
void	update (const byte[], size_t)
bool	verify (const MemoryRegion< byte > &, const MemoryRegion< byte > &, size_t)
	~EMSA3 ()

Detailed Description

EMSA3 from IEEE 1363 aka PKCS #1 v1.5 signature padding aka PKCS #1 block type 1

Definition at line 21 of file emsa3.h.

Constructor & Destructor Documentation

EMSA3()

Botan::EMSA3::EMSA3

(

HashFunction *

hash

)

Parameters

hash	the hash object to use

Definition at line 94 of file emsa3.cpp.

                                  : hash(hash_in)
   {
   hash_id = pkcs_hash_id(hash->name());
   }

References Botan::pkcs_hash_id().

Referenced by Botan::get_emsa().

~EMSA3()

Botan::EMSA3::~EMSA3

(

)

Definition at line 102 of file emsa3.cpp.

   {
   delete hash;
   }

Member Function Documentation

encoding_of()

SecureVector< byte > Botan::EMSA3::encoding_of ( const MemoryRegion< byte > & msg, size_t output_bits, RandomNumberGenerator & rng )

virtual

Return the encoding of a message

Parameters

msg	the result of raw_data()
output_bits	the desired output bit size
rng	a random number generator

Returns

encoded signature

Implements Botan::EMSA.

Definition at line 59 of file emsa3.cpp.

   {
   if(msg.size() != hash->output_length())
      throw Encoding_Error("EMSA3::encoding_of: Bad input length");
 
   return emsa3_encoding(msg, output_bits,
                         &hash_id[0], hash_id.size());
   }

References Botan::Encoding_Error::Encoding_Error(), and Botan::MemoryRegion< T >::size().

raw_data()

SecureVector< byte > Botan::EMSA3::raw_data ( )

virtual

Returns

raw hash

Implements Botan::EMSA.

Definition at line 51 of file emsa3.cpp.

   {
   return hash->final();
   }

update()

void Botan::EMSA3::update ( const byte input[], size_t length )

virtual

Add more data to the signature computation

Parameters

input	some data
length	length of input in bytes

Implements Botan::EMSA.

Definition at line 43 of file emsa3.cpp.

   {
   hash->update(input, length);
   }

verify()

bool Botan::EMSA3::verify ( const MemoryRegion< byte > & coded, const MemoryRegion< byte > & raw, size_t key_bits )

virtual

Verify the encoding

Parameters

coded	the received (coded) message representative
raw	the computed (local, uncoded) message representative
key_bits	the size of the key in bits

Returns

true if coded is a valid encoding of raw, otherwise false

Implements Botan::EMSA.

Definition at line 73 of file emsa3.cpp.

   {
   if(raw.size() != hash->output_length())
      return false;
 
   try
      {
      return (coded == emsa3_encoding(raw, key_bits,
                                      &hash_id[0], hash_id.size()));
      }
   catch(...)
      {
      return false;
      }
   }

References Botan::MemoryRegion< T >::size().

---

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

• src/pk_pad/emsa3/emsa3.h
• src/pk_pad/emsa3/emsa3.cpp