Botan::OAEP Class Reference

#include <oaep.h>

Inheritance diagram for Botan::OAEP:

List of all members.

Public Types
typedef SCAN_Name	Spec
Public Member Functions
secure_vector< byte >	decode (const byte in[], size_t in_length, size_t key_length) const
secure_vector< byte >	decode (const secure_vector< byte > &in, size_t key_length) const
secure_vector< byte >	encode (const byte in[], size_t in_length, size_t key_length, RandomNumberGenerator &rng) const
secure_vector< byte >	encode (const secure_vector< byte > &in, size_t key_length, RandomNumberGenerator &rng) const
size_t	maximum_input_size (size_t) const
	OAEP (HashFunction *hash, const std::string &P="")
Static Public Member Functions
static OAEP *	make (const Spec &spec)

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Detailed Description

OAEP (called EME1 in IEEE 1363 and in earlier versions of the library)

Definition at line 20 of file oaep.h.

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Member Typedef Documentation

typedef SCAN_Name Botan::EME::Spec [inherited]

Definition at line 23 of file eme.h.

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Constructor & Destructor Documentation

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

Parameters:

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

Definition at line 150 of file oaep.cpp.

Referenced by make().

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

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Member Function Documentation

secure_vector< byte > Botan::EME::decode	(	const byte	in[],
		size_t	in_length,
		size_t	key_length
	)		const [inherited]

Decode an input

Parameters:

in	the encoded plaintext
in_length	length of encoded plaintext in bytes
key_length	length of the key in bits

Returns:

plaintext

Definition at line 35 of file eme.cpp.

   {
   return unpad(msg, msg_len, key_bits);
   }

secure_vector< byte > Botan::EME::decode	(	const secure_vector< byte > &	in,
		size_t	key_length
	)		const [inherited]

Decode an input

Parameters:

in	the encoded plaintext
key_length	length of the key in bits

Returns:

plaintext

Definition at line 44 of file eme.cpp.

   {
   return unpad(&msg[0], msg.size(), key_bits);
   }

secure_vector< byte > Botan::EME::encode	(	const byte	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 15 of file eme.cpp.

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

secure_vector< byte > Botan::EME::encode	(	const secure_vector< byte > &	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 25 of file eme.cpp.

   {
   return pad(&msg[0], msg.size(), key_bits, rng);
   }

OAEP * Botan::OAEP::make

(

const Spec &

spec

)

[static]

Definition at line 16 of file oaep.cpp.

References Botan::SCAN_Name::algo_name(), Botan::SCAN_Name::arg(), Botan::SCAN_Name::arg_count(), Botan::SCAN_Name::arg_count_between(), and OAEP().

   {
   if(request.algo_name() == "OAEP" && request.arg_count_between(1, 2))
      {
      auto& hashes = Algo_Registry<HashFunction>::global_registry();

      if(request.arg_count() == 1 ||
         (request.arg_count() == 2 && request.arg(1) == "MGF1"))
         {
         if(HashFunction* hash = hashes.make(request.arg(0)))
            return new OAEP(hash);
         }
      }

   return nullptr;
   }

size_t Botan::OAEP::maximum_input_size

(

size_t

keybits

)

const [virtual]

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 139 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