TF_DecryptorBase Class Reference

Trapdoor function cryptosystems decryption base class. More...

#include <pubkey.h>

Inheritance diagram for TF_DecryptorBase:

Public Member Functions
DecodingResult	Decrypt (RandomNumberGenerator &rng, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const NameValuePairs &parameters=g_nullNameValuePairs) const
	Decrypt a byte string. More...
Public Member Functions inherited from TF_CryptoSystemBase< PK_Decryptor, TF_Base< TrapdoorFunctionInverse, PK_EncryptionMessageEncodingMethod > >
bool	ParameterSupported (const char *name) const
size_t	FixedMaxPlaintextLength () const
size_t	FixedCiphertextLength () const
Public Member Functions inherited from PK_FixedLengthCryptoSystemImpl< PK_Decryptor >
size_t	MaxPlaintextLength (size_t ciphertextLength) const
size_t	CiphertextLength (size_t plaintextLength) const
virtual size_t	FixedMaxPlaintextLength () const=0
virtual size_t	FixedCiphertextLength () const=0
Public Member Functions inherited from PK_Decryptor
virtual DecodingResult	Decrypt (RandomNumberGenerator &rng, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const NameValuePairs &parameters=g_nullNameValuePairs) const =0
	Decrypt a byte string. More...
virtual BufferedTransformation *	CreateDecryptionFilter (RandomNumberGenerator &rng, BufferedTransformation *attachment=NULL, const NameValuePairs &parameters=g_nullNameValuePairs) const
	Create a new decryption filter. More...
DecodingResult	FixedLengthDecrypt (RandomNumberGenerator &rng, const byte *ciphertext, byte *plaintext, const NameValuePairs &parameters=g_nullNameValuePairs) const
	Decrypt a fixed size ciphertext. More...
virtual size_t	MaxPlaintextLength (size_t ciphertextLength) const =0
	Provides the maximum length of plaintext for a given ciphertext length. More...
virtual size_t	CiphertextLength (size_t plaintextLength) const =0
	Calculate the length of ciphertext given length of plaintext. More...
virtual bool	ParameterSupported (const char *name) const =0
	Determines whether this object supports the use of a named parameter. More...
virtual size_t	FixedCiphertextLength () const
	Provides the fixed ciphertext length, if one exists. More...
virtual size_t	FixedMaxPlaintextLength () const
	Provides the maximum plaintext length given a fixed ciphertext length. More...
Public Member Functions inherited from PrivateKeyAlgorithm
CryptoMaterial &	AccessMaterial ()
	Retrieves a reference to a Private Key. More...
const CryptoMaterial &	GetMaterial () const
	Retrieves a reference to a Private Key. More...
virtual PrivateKey &	AccessPrivateKey ()=0
	Retrieves a reference to a Private Key. More...
virtual const PrivateKey &	GetPrivateKey () const
	Retrieves a reference to a Private Key. More...
virtual CryptoMaterial &	AccessMaterial ()=0
	Retrieves a reference to CryptoMaterial. More...
virtual const CryptoMaterial &	GetMaterial () const =0
	Retrieves a reference to CryptoMaterial. More...
Public Member Functions inherited from Algorithm
	Algorithm (bool checkSelfTestStatus=true)
	Interface for all crypto algorithms. More...
virtual std::string	AlgorithmName () const
	Provides the name of this algorithm. More...
virtual std::string	AlgorithmProvider () const
	Retrieve the provider of this algorithm. More...
Public Member Functions inherited from Clonable
virtual Clonable *	Clone () const
	Copies this object. More...

Detailed Description

Trapdoor function cryptosystems decryption base class.

Definition at line 283 of file pubkey.h.

Constructor & Destructor Documentation

~TF_DecryptorBase()

virtual TF_DecryptorBase::~TF_DecryptorBase ( )

inlinevirtual

Definition at line 286 of file pubkey.h.

Member Function Documentation

Decrypt()

DecodingResult TF_DecryptorBase::Decrypt ( RandomNumberGenerator &  rng, const byte *  ciphertext, size_t  ciphertextLength, byte *  plaintext, const NameValuePairs &  parameters = g_nullNameValuePairs  ) const

virtual

Decrypt a byte string.

Parameters

rng	a RandomNumberGenerator derived class
ciphertext	the encrypted byte buffer
ciphertextLength	the size of the encrypted byte buffer
plaintext	a byte buffer to hold the decrypted string
parameters	a set of NameValuePairs to initialize this object

Returns

the result of the decryption operation

If DecodingResult::isValidCoding is true, then DecodingResult::messageLength is valid and holds the actual length of the plaintext recovered. The result is undefined if decryption failed. If DecodingResult::isValidCoding is false, then DecodingResult::messageLength is undefined.

Precondition

COUNTOF(plaintext) == MaxPlaintextLength(ciphertextLength) ensures the output byte buffer is large enough

See also

PK_Encryptor

Implements PK_Decryptor.

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

• pubkey.h