PK_CryptoSystem Class Reference

#include <cryptlib.h>

Inheritance diagram for PK_CryptoSystem:

PK_Decryptor PK_Encryptor DL_CryptoSystemBase< PK_Decryptor, DL_PrivateKey< SCHEME_OPTIONS::Element > > DL_CryptoSystemBase< PK_Decryptor, DL_PrivateKey< T > > PK_FixedLengthCryptoSystemImpl< PK_Decryptor > DL_CryptoSystemBase< PK_Encryptor, DL_PublicKey< SCHEME_OPTIONS::Element > > DL_CryptoSystemBase< PK_Encryptor, DL_PublicKey< T > > PK_FixedLengthCryptoSystemImpl< PK_Encryptor > DL_DecryptorBase< SCHEME_OPTIONS::Element > DL_DecryptorBase< T > TF_CryptoSystemBase< PK_Decryptor, TF_Base< TrapdoorFunctionInverse, PK_EncryptionMessageEncodingMethod > > DL_EncryptorBase< SCHEME_OPTIONS::Element > DL_EncryptorBase< T > TF_CryptoSystemBase< PK_Encryptor, TF_Base< RandomizedTrapdoorFunction, PK_EncryptionMessageEncodingMethod > > AlgorithmImpl< DL_DecryptorBase< SCHEME_OPTIONS::Element >, SCHEME_OPTIONS::AlgorithmInfo > TF_DecryptorBase AlgorithmImpl< DL_EncryptorBase< SCHEME_OPTIONS::Element >, SCHEME_OPTIONS::AlgorithmInfo > TF_EncryptorBase DL_ObjectImplBase< DL_DecryptorBase< SCHEME_OPTIONS::Element >, SCHEME_OPTIONS, SCHEME_OPTIONS::PrivateKey > AlgorithmImpl< TF_DecryptorBase, SCHEME_OPTIONS::AlgorithmInfo > DL_ObjectImplBase< DL_EncryptorBase< SCHEME_OPTIONS::Element >, SCHEME_OPTIONS, SCHEME_OPTIONS::PublicKey > AlgorithmImpl< TF_EncryptorBase, SCHEME_OPTIONS::AlgorithmInfo > DL_ObjectImpl< DL_DecryptorBase< SCHEME_OPTIONS::Element >, SCHEME_OPTIONS, SCHEME_OPTIONS::PrivateKey > TF_ObjectImplBase< TF_DecryptorBase, SCHEME_OPTIONS, SCHEME_OPTIONS::PrivateKey > DL_ObjectImpl< DL_EncryptorBase< SCHEME_OPTIONS::Element >, SCHEME_OPTIONS, SCHEME_OPTIONS::PublicKey > TF_ObjectImplBase< TF_EncryptorBase, SCHEME_OPTIONS, SCHEME_OPTIONS::PublicKey > DL_DecryptorImpl< SCHEME_OPTIONS > TF_ObjectImpl< TF_DecryptorBase, SCHEME_OPTIONS, SCHEME_OPTIONS::PrivateKey > DL_EncryptorImpl< SCHEME_OPTIONS > TF_ObjectImpl< TF_EncryptorBase, SCHEME_OPTIONS, SCHEME_OPTIONS::PublicKey > TF_DecryptorImpl< SCHEME_OPTIONS > TF_EncryptorImpl< SCHEME_OPTIONS > List of all members.

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 1127 of file cryptlib.h.

Public Member Functions

virtual ~PK_CryptoSystem ()
virtual size_t MaxPlaintextLength (size_t ciphertextLength) const =0
 maximum length of plaintext for a given ciphertext length
virtual size_t CiphertextLength (size_t plaintextLength) const =0
 calculate length of ciphertext given length of plaintext
virtual bool ParameterSupported (const char *name) const =0
 this object supports the use of the parameter with the given name
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


Member Function Documentation

virtual size_t PK_CryptoSystem::MaxPlaintextLength ( size_t  ciphertextLength  )  const [pure virtual]

maximum length of plaintext for a given ciphertext length

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

Implemented in PK_FixedLengthCryptoSystemImpl< PK_Encryptor >, PK_FixedLengthCryptoSystemImpl< PK_Decryptor >, 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 > >, and DL_CryptoSystemBase< PK_Encryptor, DL_PublicKey< T > >.

Referenced by PK_DefaultDecryptionFilter::Put2().

virtual size_t PK_CryptoSystem::CiphertextLength ( size_t  plaintextLength  )  const [pure virtual]

calculate length of ciphertext given length of plaintext

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

Implemented in PK_FixedLengthCryptoSystemImpl< PK_Encryptor >, PK_FixedLengthCryptoSystemImpl< PK_Decryptor >, 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 > >, and DL_CryptoSystemBase< PK_Encryptor, DL_PublicKey< T > >.

Referenced by PK_DefaultEncryptionFilter::Put2().

virtual bool PK_CryptoSystem::ParameterSupported ( const char *  name  )  const [pure virtual]

this object supports the use of the parameter with the given name

some possible parameter names: EncodingParameters, KeyDerivationParameters

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

virtual size_t PK_CryptoSystem::FixedCiphertextLength (  )  const [inline, virtual]

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 1147 of file cryptlib.h.

Referenced by PK_Decryptor::FixedLengthDecrypt().


The documentation for this class was generated from the following file:
Generated on Sat Dec 23 02:07:29 2006 for Crypto++ by  doxygen 1.5.1-p1