Interface for public-key encryptors and decryptors. More...

#include <cryptlib.h>

Inheritance diagram for PK_CryptoSystem:

Public Member Functions
virtual	~PK_CryptoSystem ()

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...

Detailed Description

Interface for public-key encryptors and decryptors.

This class provides an interface common to encryptors and decryptors for querying their plaintext and ciphertext lengths.

Definition at line 2293 of file cryptlib.h.

Constructor & Destructor Documentation

virtual PK_CryptoSystem::~PK_CryptoSystem ( )

inlinevirtual

Definition at line 2296 of file cryptlib.h.

Member Function Documentation

virtual size_t PK_CryptoSystem::CiphertextLength ( size_t plaintextLength ) const

pure virtual

Calculate the length of ciphertext given length of plaintext.

Returns: the maximum size of the ciphertext, in bytes

This function returns 0 if plaintextLength is not valid (too long).

Implemented in DL_CryptoSystemBase< PK_Decryptor, DL_PrivateKey< SCHEME_OPTIONS::Element > >, DL_CryptoSystemBase< PK_Decryptor, DL_PrivateKey< T > >, DL_CryptoSystemBase< PK_Encryptor, DL_PublicKey< SCHEME_OPTIONS::Element > >, DL_CryptoSystemBase< PK_Encryptor, DL_PublicKey< T > >, PK_FixedLengthCryptoSystemImpl< PK_Encryptor >, and PK_FixedLengthCryptoSystemImpl< PK_Decryptor >.

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virtual size_t PK_CryptoSystem::FixedCiphertextLength ( ) const

inlinevirtual

Provides the fixed ciphertext length, if one exists.

Returns: the fixed ciphertext length if one exists, otherwise 0

"Fixed" here means length of ciphertext does not depend on length of plaintext. In this case, it usually does depend on the key length.

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

Definition at line 2319 of file cryptlib.h.

virtual size_t PK_CryptoSystem::FixedMaxPlaintextLength ( ) const

inlinevirtual

Provides the maximum plaintext length given a fixed ciphertext length.

Returns: maximum plaintext length given the fixed ciphertext length, if one exists, otherwise return 0.

FixedMaxPlaintextLength(0 returns the maximum plaintext length given the fixed ciphertext length, if one exists, otherwise return 0.

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

Definition at line 2326 of file cryptlib.h.

virtual size_t PK_CryptoSystem::MaxPlaintextLength ( size_t ciphertextLength ) const

pure virtual

Provides the maximum length of plaintext for a given ciphertext length.

Returns: the maximum size of the plaintext, in bytes

This function returns 0 if ciphertextLength is not valid (too long or too short).

Implemented in DL_CryptoSystemBase< PK_Decryptor, DL_PrivateKey< SCHEME_OPTIONS::Element > >, DL_CryptoSystemBase< PK_Decryptor, DL_PrivateKey< T > >, DL_CryptoSystemBase< PK_Encryptor, DL_PublicKey< SCHEME_OPTIONS::Element > >, DL_CryptoSystemBase< PK_Encryptor, DL_PublicKey< T > >, PK_FixedLengthCryptoSystemImpl< PK_Encryptor >, and PK_FixedLengthCryptoSystemImpl< PK_Decryptor >.

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virtual bool PK_CryptoSystem::ParameterSupported ( const char * name ) const

pure virtual

Determines whether this object supports the use of a named parameter.

Parameters

name	the name of the parameter

Returns: true if the parameter name is supported, false otherwise

Some possible parameter names: EncodingParameters(), KeyDerivationParameters() and others Parameters listed in argnames.h

Implemented in DL_CryptoSystemBase< PK_Decryptor, DL_PrivateKey< SCHEME_OPTIONS::Element > >, DL_CryptoSystemBase< PK_Decryptor, DL_PrivateKey< T > >, DL_CryptoSystemBase< PK_Encryptor, DL_PublicKey< SCHEME_OPTIONS::Element > >, DL_CryptoSystemBase< PK_Encryptor, DL_PublicKey< T > >, TF_CryptoSystemBase< PK_Decryptor, TF_Base< TrapdoorFunctionInverse, PK_EncryptionMessageEncodingMethod > >, and TF_CryptoSystemBase< PK_Encryptor, TF_Base< RandomizedTrapdoorFunction, PK_EncryptionMessageEncodingMethod > >.

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

src/cryptopp/cryptlib.h

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation