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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 > TwoBases< TF_DecryptorBase, PrivateKeyCopier< SCHEME_OPTIONS::Keys > > DL_ObjectImplBase< DL_EncryptorBase< SCHEME_OPTIONS::Element >, SCHEME_OPTIONS, SCHEME_OPTIONS::PublicKey > TwoBases< TF_EncryptorBase, PublicKeyCopier< SCHEME_OPTIONS::Keys > > DL_ObjectImpl< DL_DecryptorBase< SCHEME_OPTIONS::Element >, SCHEME_OPTIONS, SCHEME_OPTIONS::PrivateKey > AlgorithmImpl< TwoBases< TF_DecryptorBase, PrivateKeyCopier< SCHEME_OPTIONS::Keys > >, SCHEME_OPTIONS::AlgorithmInfo > DL_ObjectImpl< DL_EncryptorBase< SCHEME_OPTIONS::Element >, SCHEME_OPTIONS, SCHEME_OPTIONS::PublicKey > AlgorithmImpl< TwoBases< TF_EncryptorBase, PublicKeyCopier< SCHEME_OPTIONS::Keys > >, SCHEME_OPTIONS::AlgorithmInfo > DL_PrivateObjectImpl< DL_DecryptorBase< SCHEME_OPTIONS::Element >, SCHEME_OPTIONS > TF_ObjectImplBase< TwoBases< TF_DecryptorBase, PrivateKeyCopier< SCHEME_OPTIONS::Keys > >, SCHEME_OPTIONS, PrivateKeyCopier< SCHEME_OPTIONS::Keys >::KeyClass > DL_PublicObjectImpl< DL_EncryptorBase< SCHEME_OPTIONS::Element >, SCHEME_OPTIONS > TF_ObjectImplBase< TwoBases< TF_EncryptorBase, PublicKeyCopier< SCHEME_OPTIONS::Keys > >, SCHEME_OPTIONS, PublicKeyCopier< SCHEME_OPTIONS::Keys >::KeyClass > DL_DecryptorImpl< SCHEME_OPTIONS > TF_ObjectImpl< TF_DecryptorBase, SCHEME_OPTIONS, PrivateKeyCopier< SCHEME_OPTIONS::Keys > > DL_EncryptorImpl< SCHEME_OPTIONS > TF_ObjectImpl< TF_EncryptorBase, SCHEME_OPTIONS, PublicKeyCopier< SCHEME_OPTIONS::Keys > > 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 1109 of file cryptlib.h.

Public Member Functions

virtual unsigned int MaxPlaintextLength (unsigned int ciphertextLength) const =0
 maximum length of plaintext for a given ciphertext length
virtual unsigned int CiphertextLength (unsigned int 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 unsigned int FixedCiphertextLength () const
 return fixed ciphertext length, if one exists, otherwise return 0
virtual unsigned int FixedMaxPlaintextLength () const
 return maximum plaintext length given the fixed ciphertext length, if one exists, otherwise return 0

Member Function Documentation

virtual unsigned int PK_CryptoSystem::MaxPlaintextLength unsigned int  ciphertextLength  )  const [pure virtual]

maximum length of plaintext for a given ciphertext length

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

virtual unsigned int PK_CryptoSystem::CiphertextLength unsigned int  plaintextLength  )  const [pure virtual]

calculate length of ciphertext given length of plaintext

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

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

virtual unsigned int PK_CryptoSystem::FixedCiphertextLength  )  const [inline, virtual]

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

"Fixed" here means length of ciphertext does not depend on length of plaintext. It usually does depend on the key length.
Definition at line 1129 of file cryptlib.h.

Referenced by TF_DecryptorBase::Decrypt(), and TF_EncryptorBase::Encrypt().

The documentation for this class was generated from the following file:
Generated on Wed Jul 21 19:16:01 2004 for Crypto++ by doxygen 1.3.7-20040704