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# PK_FixedLengthEncryptor Class Reference

`#include <cryptlib.h>`

Inheritance diagram for PK_FixedLengthEncryptor:

List of all members.

## Detailed Description

interface for encryptors with fixed length ciphertext

Definition at line 1188 of file cryptlib.h.

## Public Member Functions
virtual void | Encrypt (RandomNumberGenerator &rng, const byte *plainText, unsigned int plainTextLength, byte *cipherText) const=0
| encrypt a byte string
virtual BufferedTransformation * | CreateEncryptionFilter (RandomNumberGenerator &rng, BufferedTransformation *attachment=NULL) const
| create a new encryption 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 PublicKey & | AccessPublicKey ()=0
virtual const PublicKey & | GetPublicKey () 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 void PK_Encryptor::Encrypt | ( | RandomNumberGenerator & | rng,
|  | const byte * | plainText,
|  | unsigned int | plainTextLength,
|  | byte * | cipherText
| ) | const`[pure virtual, inherited]`

| encrypt a byte string Precondition: CipherTextLength(plainTextLength) != 0 (i.e., plainText isn't too long) size of cipherText == CipherTextLength(plainTextLength) Implemented in TF_EncryptorBase.

BufferedTransformation * PK_Encryptor::CreateEncryptionFilter | ( | RandomNumberGenerator & | rng,
|  | BufferedTransformation * | attachment = NULL
| ) | const`[virtual, inherited]`

| create a new encryption filter Note: caller is responsible for deleting the returned pointer Definition at line 508 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 file:

- cryptlib.h