java.lang.Object
- org.bouncycastle.pqc.crypto.ntru.NTRUEngine

All Implemented Interfaces:

AsymmetricBlockCipher
```
public class NTRUEngine
extends java.lang.Object
implements AsymmetricBlockCipher
```
Encrypts, decrypts data and generates key pairs.
The parameter p is hardcoded to 3.

Constructor Summary

Constructors
Constructor Description

NTRUEngine()
Constructs a new instance with a set of encryption parameters.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected IntegerPolynomial`	`decrypt(IntegerPolynomial e, Polynomial priv_t, IntegerPolynomial priv_fp)`
`protected IntegerPolynomial`	`encrypt(IntegerPolynomial m, TernaryPolynomial r, IntegerPolynomial pubKey)`
`int`	`getInputBlockSize()`	returns the largest size an input block can be.
`int`	`getOutputBlockSize()`	returns the maximum size of the block produced by this cipher.
`void`	`init(boolean forEncryption, CipherParameters parameters)`	initialise the cipher.
`byte[]`	`processBlock(byte[] in, int inOff, int len)`	process the block of len bytes stored in in from offset inOff.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - NTRUEngine
```
public NTRUEngine()
```
    Constructs a new instance with a set of encryption parameters.
- Method Detail
  - init
```
public void init(boolean forEncryption,
                 CipherParameters parameters)
```
    Description copied from interface: AsymmetricBlockCipher
    
    initialise the cipher.
    
    Specified by:
    
    init in interface AsymmetricBlockCipher
    
    Parameters:
    
    forEncryption - if true the cipher is initialised for encryption, if false for decryption.
    
    parameters - the key and other data required by the cipher.
  - getInputBlockSize
```
public int getInputBlockSize()
```
    Description copied from interface: AsymmetricBlockCipher
    
    returns the largest size an input block can be.
    
    Specified by:
    
    getInputBlockSize in interface AsymmetricBlockCipher
    
    Returns:
    
    maximum size for an input block.
  - getOutputBlockSize
```
public int getOutputBlockSize()
```
    Description copied from interface: AsymmetricBlockCipher
    
    returns the maximum size of the block produced by this cipher.
    
    Specified by:
    
    getOutputBlockSize in interface AsymmetricBlockCipher
    
    Returns:
    
    maximum size of the output block produced by the cipher.
  - processBlock
```
public byte[] processBlock(byte[] in,
                           int inOff,
                           int len)
                    throws InvalidCipherTextException
```
    Description copied from interface: AsymmetricBlockCipher
    
    process the block of len bytes stored in in from offset inOff.
    
    Specified by:
    
    processBlock in interface AsymmetricBlockCipher
    
    Parameters:
    
    in - the input data
    
    inOff - offset into the in array where the data starts
    
    len - the length of the block to be processed.
    
    Returns:
    
    the resulting byte array of the encryption/decryption process.
    
    Throws:
    
    InvalidCipherTextException - data decrypts improperly.
  - encrypt
```
protected IntegerPolynomial encrypt(IntegerPolynomial m,
                                    TernaryPolynomial r,
                                    IntegerPolynomial pubKey)
```
  - decrypt
```
protected IntegerPolynomial decrypt(IntegerPolynomial e,
                                    Polynomial priv_t,
                                    IntegerPolynomial priv_fp)
```
    Parameters:
    
    e -
    
    priv_t - a polynomial such that if fastFp=true, f=1+3*priv_t; otherwise, f=priv_t
    
    priv_fp -
    
    Returns:
    
    an IntegerPolynomial representing the output.

Class NTRUEngine

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

NTRUEngine

Method Detail

init

getInputBlockSize

getOutputBlockSize

processBlock

encrypt

decrypt