Botan::EME1 Class Reference

#include <eme1.h>

Inheritance diagram for Botan::EME1:

Public Member Functions
SecureVector< byte >	decode (const byte in[], size_t in_length, size_t key_length) const
SecureVector< byte >	decode (const MemoryRegion< byte > &in, size_t key_length) const
	EME1 (HashFunction *hash, const std::string &P="")
SecureVector< byte >	encode (const byte in[], size_t in_length, size_t key_length, RandomNumberGenerator &rng) const
SecureVector< byte >	encode (const MemoryRegion< byte > &in, size_t key_length, RandomNumberGenerator &rng) const
size_t	maximum_input_size (size_t) const
	~EME1 ()

Detailed Description

EME1, aka OAEP

Definition at line 20 of file eme1.h.

Constructor & Destructor Documentation

EME1()

Botan::EME1::EME1	(	HashFunction *	hash,
		const std::string &	P = "" )

Parameters

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

Definition at line 125 of file eme1.cpp.

   {
   Phash = hash->process(P);
   mgf = new MGF1(hash);
   }

References Botan::MGF1::MGF1(), and Botan::Buffered_Computation::process().

Referenced by Botan::get_eme().

~EME1()

Botan::EME1::~EME1 ( )

inline

Definition at line 31 of file eme1.h.

{ delete mgf; }

Member Function Documentation

decode() [1/2]

SecureVector< 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);
   }

Referenced by maximum_input_size().

decode() [2/2]

SecureVector< byte > Botan::EME::decode ( const MemoryRegion< 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);
   }

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

encode() [1/2]

SecureVector< 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);
   }

Referenced by maximum_input_size().

encode() [2/2]

SecureVector< byte > Botan::EME::encode ( const MemoryRegion< 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);
   }

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

maximum_input_size()

size_t Botan::EME1::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 114 of file eme1.cpp.

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

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

• src/pk_pad/eme1/eme1.h
• src/pk_pad/eme1/eme1.cpp