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PK_Decryptor Class Reference

#include <cryptlib.h>

Inheritance diagram for PK_Decryptor:

PK_CryptoSystem PrivateKeyAlgorithm AsymmetricAlgorithm Algorithm Clonable DL_CryptoSystemBase< PK_Decryptor, DL_PrivateKey< T > > PK_FixedLengthCryptoSystemImpl< PK_Decryptor > DL_DecryptorBase< T > TF_CryptoSystemBase< PK_Decryptor, TF_Base< TrapdoorFunctionInverse, PK_EncryptionMessageEncodingMethod > > TF_DecryptorBase List of all members.

Detailed Description

interface for public-key decryptors

Definition at line 1174 of file cryptlib.h.

Public Member Functions

virtual DecodingResult Decrypt (RandomNumberGenerator &rng, const byte *ciphertext, unsigned int ciphertextLength, byte *plaintext, const NameValuePairs &parameters=g_nullNameValuePairs) const =0
 decrypt a byte string, and return the length of plaintext
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 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
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 PrivateKey & AccessPrivateKey ()=0
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 std::string AlgorithmName () const
 returns name of this algorithm, not universally implemented yet
virtual Clonable * Clone () const
 this is not implemented by most classes yet

Member Function Documentation

virtual DecodingResult PK_Decryptor::Decrypt (  RandomNumberGenerator &  rng,
const byte *  ciphertext,
unsigned int  ciphertextLength,
byte *  plaintext,
const NameValuePairs &  parameters = g_nullNameValuePairs
)  const [pure virtual]
 

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.

Implemented in TF_DecryptorBase, and DL_DecryptorBase< T >.

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

create a new decryption filter

Note:
caller is responsible for deleting the returned pointer
Definition at line 610 of file cryptlib.cpp.

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

maximum length of plaintext for a given ciphertext length

Note:
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, inherited]
 

calculate length of ciphertext given length of plaintext

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

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

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, 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.
Definition at line 1134 of file cryptlib.h.

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

The documentation for this class was generated from the following files:
Generated on Sat Aug 28 17:25:02 2004 for Crypto++ by doxygen 1.3.8