PK_FixedLengthDecryptor Class Reference

#include <cryptlib.h>

Inheritance diagram for PK_FixedLengthDecryptor:

List of all members.

---

Detailed Description

interface for decryptors with fixed length ciphertext

Definition at line 1194 of file cryptlib.h.

Public Member Functions
virtual DecodingResult	FixedLengthDecrypt (const byte *cipherText, byte *plainText) const=0
	decrypt a byte string, and return the length of plaintext
DecodingResult	Decrypt (const byte *cipherText, unsigned int cipherTextLength, byte *plainText) const
	decrypt a byte string, and return the length of plaintext
virtual BufferedTransformation *	CreateDecryptionFilter (BufferedTransformation *attachment=NULL) const
	create a new decryption filter
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
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
virtual unsigned int	FixedMaxPlaintextLength () const=0
virtual unsigned int	FixedCiphertextLength () const=0
unsigned int	MaxPlaintextLength (unsigned int cipherTextLength) const
	maximum length of plaintext for a given ciphertext length
unsigned int	CiphertextLength (unsigned int plainTextLength) const
	calculate length of ciphertext given length of plaintext

---

Member Function Documentation

virtual DecodingResult PK_FixedLengthDecryptor::FixedLengthDecrypt (  const byte *  cipherText, byte *  plainText )  const [pure virtual]

decrypt a byte string, and return the length of plaintext Precondition: length of cipherText == CipherTextLength() size of plainText == MaxPlainTextLength() Returns: the actual length of the plaintext, or 0 if decryption fails. Implemented in TF_DecryptorBase. Referenced by Decrypt().

DecodingResult PK_FixedLengthDecryptor::Decrypt (  const byte *  cipherText, unsigned int  cipherTextLength, byte *  plainText )  const [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, or 0 if decryption fails. Implements PK_Decryptor. Definition at line 611 of file cryptlib.cpp. References FixedLengthDecrypt().

BufferedTransformation * PK_Decryptor::CreateDecryptionFilter (  BufferedTransformation *  attachment = NULL  )  const [virtual, inherited]

create a new decryption filter Note: caller is responsible for deleting the returned pointer Definition at line 551 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). Implemented in PK_FixedLengthCryptoSystem.

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). Implemented in PK_FixedLengthCryptoSystem.

unsigned int PK_FixedLengthCryptoSystem::MaxPlaintextLength (  unsigned int  cipherTextLength  )  const [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). Implements PK_CryptoSystem. Definition at line 595 of file cryptlib.cpp.

unsigned int PK_FixedLengthCryptoSystem::CiphertextLength (  unsigned int  plainTextLength  )  const [virtual, inherited]

calculate length of ciphertext given length of plaintext Note: This function returns 0 if plainTextLength is not valid (too long). Implements PK_CryptoSystem. Definition at line 603 of file cryptlib.cpp.

---

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

• cryptlib.h
• cryptlib.cpp

---