org.spongycastle.pqc.crypto.ntru

Class NTRUSigningParameters

java.lang.Object

org.spongycastle.pqc.crypto.ntru.NTRUSigningParameters

All Implemented Interfaces:

java.lang.Cloneable

public class NTRUSigningParameters
extends java.lang.Object
implements java.lang.Cloneable

A set of parameters for NtruSign. Several predefined parameter sets are available and new ones can be created as well.

Field Summary

Fields

Modifier and Type	Field and Description
int	B
double	betaSq
int	d
int	d1
int	d2
int	d3
Digest	hashAlg
int	N
double	normBoundSq
int	q
int	signFailTolerance

Constructor Summary

Constructors

Constructor and Description
NTRUSigningParameters(java.io.InputStream is) Reads a parameter set from an input stream.
NTRUSigningParameters(int N, int q, int d, int B, double beta, double normBound, Digest hashAlg) Constructs a parameter set that uses ternary private keys (i.e.
NTRUSigningParameters(int N, int q, int d1, int d2, int d3, int B, double beta, double normBound, double keyNormBound, Digest hashAlg) Constructs a parameter set that uses product-form private keys (i.e.

Method Summary

Modifier and Type	Method and Description
NTRUSigningParameters	clone()
boolean	equals(java.lang.Object obj)
int	hashCode()
java.lang.String	toString()
void	writeTo(java.io.OutputStream os) Writes the parameter set to an output stream

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

N

public int N

q

public int q

d

public int d

d1

public int d1

d2

public int d2

d3

public int d3

B

public int B

betaSq

public double betaSq

normBoundSq

public double normBoundSq

signFailTolerance

public int signFailTolerance

hashAlg

public Digest hashAlg

Constructor Detail

NTRUSigningParameters

public NTRUSigningParameters(int N,
                             int q,
                             int d,
                             int B,
                             double beta,
                             double normBound,
                             Digest hashAlg)

Constructs a parameter set that uses ternary private keys (i.e. polyType=SIMPLE).

Parameters:

N - number of polynomial coefficients

q - modulus

d - number of -1's in the private polynomials f and g

B - number of perturbations

beta - balancing factor for the transpose lattice

normBound - maximum norm for valid signatures

hashAlg - a valid identifier for a java.security.MessageDigest instance such as SHA-256. The MessageDigest must support the getDigestLength() method.

NTRUSigningParameters

public NTRUSigningParameters(int N,
                             int q,
                             int d1,
                             int d2,
                             int d3,
                             int B,
                             double beta,
                             double normBound,
                             double keyNormBound,
                             Digest hashAlg)

Constructs a parameter set that uses product-form private keys (i.e. polyType=PRODUCT).

Parameters:

N - number of polynomial coefficients

q - modulus

d1 - number of -1's in the private polynomials f and g

d2 - number of -1's in the private polynomials f and g

d3 - number of -1's in the private polynomials f and g

B - number of perturbations

beta - balancing factor for the transpose lattice

normBound - maximum norm for valid signatures

keyNormBound - maximum norm for the ploynomials F and G

hashAlg - a valid identifier for a java.security.MessageDigest instance such as SHA-256. The MessageDigest must support the getDigestLength() method.

NTRUSigningParameters

public NTRUSigningParameters(java.io.InputStream is)
                      throws java.io.IOException

Reads a parameter set from an input stream.

Parameters:

is - an input stream

Throws:

java.io.IOException

Method Detail

writeTo

public void writeTo(java.io.OutputStream os)
             throws java.io.IOException

Writes the parameter set to an output stream

Parameters:

os - an output stream

Throws:

java.io.IOException

clone

public NTRUSigningParameters clone()

Overrides:

clone in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object