Botan::OAEP Class Reference

#include <oaep.h>

Inheritance diagram for Botan::OAEP:

Public Member Functions
secure_vector< uint8_t >	encode (const secure_vector< uint8_t > &in, size_t key_length, RandomNumberGenerator &rng) const
secure_vector< uint8_t >	encode (const uint8_t in[], size_t in_length, size_t key_length, RandomNumberGenerator &rng) const
size_t	maximum_input_size (size_t) const override
	OAEP (HashFunction *hash, const std::string &P="")
	OAEP (HashFunction *hash, HashFunction *mgf1_hash, const std::string &P="")

Detailed Description

OAEP (called EME1 in IEEE 1363 and in earlier versions of the library) as specified in PKCS#1 v2.0 (RFC 2437)

Definition at line 22 of file oaep.h.

Constructor & Destructor Documentation

OAEP() [1/2]

Botan::OAEP::OAEP	(	HashFunction *	hash,
		const std::string &	P = ""
	)

Parameters

hash	function to use for hashing (takes ownership)
P	an optional label. Normally empty.

Definition at line 155 of file oaep.cpp.

                                                 : m_mgf1_hash(hash)
   {
   m_Phash = m_mgf1_hash->process(P);
   }

OAEP() [2/2]

Botan::OAEP::OAEP	(	HashFunction *	hash,
		HashFunction *	mgf1_hash,
		const std::string &	P = ""
	)

Parameters

hash	function to use for hashing (takes ownership)
mgf1_hash	function to use for MGF1 (takes ownership)
P	an optional label. Normally empty.

Definition at line 160 of file oaep.cpp.

                               : m_mgf1_hash(mgf1_hash)
   {
   std::unique_ptr<HashFunction> phash(hash); // takes ownership
   m_Phash = phash->process(P);
   }

References hash.

Member Function Documentation

encode() [1/2]

secure_vector< uint8_t > Botan::EME::encode ( const secure_vector< uint8_t > &  in, size_t  key_length, RandomNumberGenerator &  rng  ) const

inherited

Encode an input

Parameters

in	the plaintext
key_length	length of the key in bits
rng	a random number generator

Returns

encoded plaintext

Definition at line 86 of file eme.cpp.

   {
   return pad(msg.data(), msg.size(), key_bits, rng);
   }

References Botan::EME::pad().

encode() [2/2]

secure_vector< uint8_t > Botan::EME::encode ( const uint8_t  in[], size_t  in_length, size_t  key_length, RandomNumberGenerator &  rng  ) const

inherited

Encode an input

Parameters

in	the plaintext
in_length	length of plaintext in bytes
key_length	length of the key in bits
rng	a random number generator

Returns

encoded plaintext

Definition at line 76 of file eme.cpp.

   {
   return pad(msg, msg_len, key_bits, rng);
   }

References Botan::EME::pad().

maximum_input_size()

size_t Botan::OAEP::maximum_input_size ( size_t  keybits ) const

overridevirtual

Return the maximum input size in bytes we can support

Parameters

keybits

the size of the key in bits

Returns

upper bound of input in bytes

Implements Botan::EME.

Definition at line 144 of file oaep.cpp.

   {
   if(keybits / 8 > 2*m_Phash.size() + 1)
      return ((keybits / 8) - 2*m_Phash.size() - 1);
   else
      return 0;
   }

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

• src/lib/pk_pad/eme_oaep/oaep.h
• src/lib/pk_pad/eme_oaep/oaep.cpp