DL_DecryptorImpl< SCHEME_OPTIONS > Class Template Reference

#include <pubkey.h>

Inheritance diagram for DL_DecryptorImpl< SCHEME_OPTIONS >:

List of all members.

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Detailed Description

template<class SCHEME_OPTIONS>
class DL_DecryptorImpl< SCHEME_OPTIONS >

_

Definition at line 1368 of file pubkey.h.

Public Types
typedef SCHEME_OPTIONS::PrivateKey::Element	Element
typedef SCHEME_OPTIONS	SchemeOptions
Public Member Functions
PrivateKey &	AccessPrivateKey ()
PublicKey &	AccessPublicKey ()
const SCHEME_OPTIONS::PrivateKey &	GetKey () const
SCHEME_OPTIONS::PrivateKey &	AccessKey ()
std::string	AlgorithmName () const
	returns name of this algorithm, not universally implemented yet
DecodingResult	Decrypt (RandomNumberGenerator &rng, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const NameValuePairs &parameters=g_nullNameValuePairs) const
	decrypt a byte string, and return the length of plaintext
size_t	MaxPlaintextLength (size_t ciphertextLength) const
	maximum length of plaintext for a given ciphertext length
size_t	CiphertextLength (size_t plaintextLength) const
	calculate length of ciphertext given length of plaintext
bool	ParameterSupported (const char *name) const
	this object supports the use of the parameter with the given name
virtual BufferedTransformation *	CreateDecryptionFilter (RandomNumberGenerator &rng, BufferedTransformation *attachment=NULL, const NameValuePairs &parameters=g_nullNameValuePairs) const
	create a new decryption filter
DecodingResult	FixedLengthDecrypt (RandomNumberGenerator &rng, const byte *ciphertext, byte *plaintext, const NameValuePairs &parameters=g_nullNameValuePairs) const
	decrypt a fixed size ciphertext
virtual size_t	FixedCiphertextLength () const
	return fixed ciphertext length, if one exists, otherwise return 0
virtual size_t	FixedMaxPlaintextLength () const
	return maximum plaintext length given the fixed ciphertext length, if one exists, otherwise return 0
CryptoMaterial &	AccessMaterial ()
	returns a reference to the crypto material used by this object
const CryptoMaterial &	GetMaterial () const
	returns a const reference to the crypto material used by this object
virtual const PrivateKey &	GetPrivateKey () const
void	BERDecode (BufferedTransformation &bt)
	for backwards compatibility, calls AccessMaterial().Load(bt)
void	DEREncode (BufferedTransformation &bt) const
	for backwards compatibility, calls GetMaterial().Save(bt)
virtual Clonable *	Clone () const
	this is not implemented by most classes yet
Static Public Member Functions
static std::string __cdecl	StaticAlgorithmName ()
Protected Types
typedef DL_PrivateKey< SCHEME_OPTIONS::Element >	KeyInterface
Protected Member Functions
const DL_ElgamalLikeSignatureAlgorithm< Element > &	GetSignatureAlgorithm () const
const DL_KeyAgreementAlgorithm< Element > &	GetKeyAgreementAlgorithm () const
const DL_KeyDerivationAlgorithm< Element > &	GetKeyDerivationAlgorithm () const
const DL_SymmetricEncryptionAlgorithm &	GetSymmetricEncryptionAlgorithm () const
HashIdentifier	GetHashIdentifier () const
const PK_SignatureMessageEncodingMethod &	GetMessageEncodingInterface () const
DL_DecryptorBase< SCHEME_OPTIONS::Element >::KeyInterface &	AccessKeyInterface ()
const DL_DecryptorBase< SCHEME_OPTIONS::Element >::KeyInterface &	GetKeyInterface () const
size_t	GetDigestSize () const
const DL_GroupParameters< Element > &	GetAbstractGroupParameters () const
DL_GroupParameters< Element > &	AccessAbstractGroupParameters ()

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Member Function Documentation

DecodingResult DL_DecryptorBase< SCHEME_OPTIONS::Element >::Decrypt	(	RandomNumberGenerator &	rng,
		const byte *	ciphertext,
		size_t	ciphertextLength,
		byte *	plaintext,
		const NameValuePairs &	parameters = g_nullNameValuePairs
	)			const [inline, virtual, inherited]

decrypt a byte string, and return the length of plaintext

Precondition:

size of plaintext == MaxPlaintextLength(ciphertextLength) bytes.

Returns:

the actual length of the plaintext, indication that decryption failed.

Implements PK_Decryptor.

Definition at line 1184 of file pubkey.h.

References DL_KeyAgreementAlgorithm< T >::AgreeWithStaticPrivateKey(), DL_GroupParameters< T >::DecodeElement(), DL_KeyDerivationAlgorithm< T >::Derive(), DL_GroupParameters< T >::GetEncodedElementSize(), DL_SymmetricEncryptionAlgorithm::GetMaxSymmetricPlaintextLength(), DL_PrivateKey< T >::GetPrivateExponent(), DL_SymmetricEncryptionAlgorithm::GetSymmetricKeyLength(), SecBlock< T, A >::size(), and DL_SymmetricEncryptionAlgorithm::SymmetricDecrypt().

size_t DL_CryptoSystemBase< PK_Decryptor , DL_PrivateKey< SCHEME_OPTIONS::Element > >::MaxPlaintextLength

(

size_t

ciphertextLength

)

const [inline, virtual, inherited]

Implements PK_CryptoSystem.

Definition at line 1156 of file pubkey.h.

size_t DL_CryptoSystemBase< PK_Decryptor , DL_PrivateKey< SCHEME_OPTIONS::Element > >::CiphertextLength

(

size_t

plaintextLength

)

const [inline, virtual, inherited]

Implements PK_CryptoSystem.

Definition at line 1162 of file pubkey.h.

bool DL_CryptoSystemBase< PK_Decryptor , DL_PrivateKey< SCHEME_OPTIONS::Element > >::ParameterSupported

(

const char *

name

)

const [inline, virtual, inherited]

Implements PK_CryptoSystem.

Definition at line 1168 of file pubkey.h.

BufferedTransformation * PK_Decryptor::CreateDecryptionFilter	(	RandomNumberGenerator &	rng,
		BufferedTransformation *	attachment = NULL,
		const NameValuePairs &	parameters = g_nullNameValuePairs
	)			const [virtual, inherited]

create a new decryption filter

Note:

caller is responsible for deleting the returned pointer

Definition at line 644 of file cryptlib.cpp.

virtual size_t PK_CryptoSystem::FixedCiphertextLength

(

)

const [inline, virtual, inherited]

return fixed ciphertext length, if one exists, otherwise return 0

Note:

"Fixed" here means length of ciphertext does not depend on length of plaintext. It usually does depend on the key length.

Reimplemented in TF_CryptoSystemBase< PK_Decryptor, TF_Base< TrapdoorFunctionInverse, PK_EncryptionMessageEncodingMethod > >, and TF_CryptoSystemBase< PK_Encryptor, TF_Base< RandomizedTrapdoorFunction, PK_EncryptionMessageEncodingMethod > >.

Definition at line 1165 of file cryptlib.h.

Referenced by PK_Decryptor::FixedLengthDecrypt().

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

• pubkey.h

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