NTRUSigningKeyGenerationParameters (core 1.58.0.0 API)

java.lang.Object
- org.spongycastle.crypto.KeyGenerationParameters
- - org.spongycastle.pqc.crypto.ntru.NTRUSigningKeyGenerationParameters

All Implemented Interfaces:

java.lang.Cloneable
```
public class NTRUSigningKeyGenerationParameters
extends KeyGenerationParameters
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
`static NTRUSigningKeyGenerationParameters`	`APR2011_439` Gives 128 bits of security
`static NTRUSigningKeyGenerationParameters`	`APR2011_439_PROD` Like `APR2011_439`, this parameter set gives 128 bits of security but uses product-form polynomials
`static NTRUSigningKeyGenerationParameters`	`APR2011_743` Gives 256 bits of security
`static NTRUSigningKeyGenerationParameters`	`APR2011_743_PROD` Like `APR2011_439`, this parameter set gives 256 bits of security but uses product-form polynomials
`int`	`B`
`static int`	`BASIS_TYPE_STANDARD`
`static int`	`BASIS_TYPE_TRANSPOSE`
`int`	`basisType`
`double`	`betaSq`
`int`	`d`
`int`	`d1`
`int`	`d2`
`int`	`d3`
`Digest`	`hashAlg`
`static int`	`KEY_GEN_ALG_FLOAT`
`static int`	`KEY_GEN_ALG_RESULTANT`
`int`	`keyGenAlg`
`double`	`keyNormBoundSq`
`int`	`N`
`double`	`normBoundSq`
`int`	`polyType`
`boolean`	`primeCheck`
`int`	`q`
`int`	`signFailTolerance`
`boolean`	`sparse`
`static NTRUSigningKeyGenerationParameters`	`TEST157` Generates key pairs quickly.
`static NTRUSigningKeyGenerationParameters`	`TEST157_PROD` Generates key pairs quickly.

Constructor Summary

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

Method Summary

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

Methods inherited from class org.spongycastle.crypto.KeyGenerationParameters
getRandom, getStrength

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - BASIS_TYPE_STANDARD
```
public static final int BASIS_TYPE_STANDARD
```
    See Also:
    
    Constant Field Values
  - BASIS_TYPE_TRANSPOSE
```
public static final int BASIS_TYPE_TRANSPOSE
```
    See Also:
    
    Constant Field Values
  - KEY_GEN_ALG_RESULTANT
```
public static final int KEY_GEN_ALG_RESULTANT
```
    See Also:
    
    Constant Field Values
  - KEY_GEN_ALG_FLOAT
```
public static final int KEY_GEN_ALG_FLOAT
```
    See Also:
    
    Constant Field Values
  - APR2011_439
```
public static final NTRUSigningKeyGenerationParameters APR2011_439
```
    Gives 128 bits of security
  - APR2011_439_PROD
```
public static final NTRUSigningKeyGenerationParameters APR2011_439_PROD
```
    Like APR2011_439, this parameter set gives 128 bits of security but uses product-form polynomials
  - APR2011_743
```
public static final NTRUSigningKeyGenerationParameters APR2011_743
```
    Gives 256 bits of security
  - APR2011_743_PROD
```
public static final NTRUSigningKeyGenerationParameters APR2011_743_PROD
```
    Like APR2011_439, this parameter set gives 256 bits of security but uses product-form polynomials
  - TEST157
```
public static final NTRUSigningKeyGenerationParameters TEST157
```
    Generates key pairs quickly. Use for testing only.
  - TEST157_PROD
```
public static final NTRUSigningKeyGenerationParameters TEST157_PROD
```
    Generates key pairs quickly. Use for testing only.
  - 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
```
  - keyNormBoundSq
```
public double keyNormBoundSq
```
  - primeCheck
```
public boolean primeCheck
```
  - basisType
```
public int basisType
```
  - sparse
```
public boolean sparse
```
  - keyGenAlg
```
public int keyGenAlg
```
  - hashAlg
```
public Digest hashAlg
```
  - polyType
```
public int polyType
```
- Constructor Detail
  - NTRUSigningKeyGenerationParameters
```
public NTRUSigningKeyGenerationParameters(int N,
                                          int q,
                                          int d,
                                          int B,
                                          int basisType,
                                          double beta,
                                          double normBound,
                                          double keyNormBound,
                                          boolean primeCheck,
                                          boolean sparse,
                                          int keyGenAlg,
                                          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
    
    basisType - whether to use the standard or transpose lattice
    
    beta - balancing factor for the transpose lattice
    
    normBound - maximum norm for valid signatures
    
    keyNormBound - maximum norm for the ploynomials F and G
    
    primeCheck - whether 2N+1 is prime
    
    sparse - whether to treat ternary polynomials as sparsely populated (SparseTernaryPolynomial vs DenseTernaryPolynomial)
    
    keyGenAlg - RESULTANT produces better bases, FLOAT is slightly faster. RESULTANT follows the EESS standard while FLOAT is described in Hoffstein et al: An Introduction to Mathematical Cryptography.
    
    hashAlg - a valid identifier for a java.security.MessageDigest instance such as SHA-256. The MessageDigest must support the getDigestLength() method.
  - NTRUSigningKeyGenerationParameters
```
public NTRUSigningKeyGenerationParameters(int N,
                                          int q,
                                          int d1,
                                          int d2,
                                          int d3,
                                          int B,
                                          int basisType,
                                          double beta,
                                          double normBound,
                                          double keyNormBound,
                                          boolean primeCheck,
                                          boolean sparse,
                                          int keyGenAlg,
                                          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
    
    basisType - whether to use the standard or transpose lattice
    
    beta - balancing factor for the transpose lattice
    
    normBound - maximum norm for valid signatures
    
    keyNormBound - maximum norm for the ploynomials F and G
    
    primeCheck - whether 2N+1 is prime
    
    sparse - whether to treat ternary polynomials as sparsely populated (SparseTernaryPolynomial vs DenseTernaryPolynomial)
    
    keyGenAlg - RESULTANT produces better bases, FLOAT is slightly faster. RESULTANT follows the EESS standard while FLOAT is described in Hoffstein et al: An Introduction to Mathematical Cryptography.
    
    hashAlg - a valid identifier for a java.security.MessageDigest instance such as SHA-256. The MessageDigest must support the getDigestLength() method.
  - NTRUSigningKeyGenerationParameters
```
public NTRUSigningKeyGenerationParameters(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
  - getSigningParameters
```
public NTRUSigningParameters getSigningParameters()
```
  - clone
```
public NTRUSigningKeyGenerationParameters 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

Class NTRUSigningKeyGenerationParameters

Field Summary

Constructor Summary

Method Summary

Methods inherited from class org.spongycastle.crypto.KeyGenerationParameters

Methods inherited from class java.lang.Object

Field Detail

BASIS_TYPE_STANDARD

BASIS_TYPE_TRANSPOSE

KEY_GEN_ALG_RESULTANT

KEY_GEN_ALG_FLOAT

APR2011_439

APR2011_439_PROD

APR2011_743

APR2011_743_PROD

TEST157

TEST157_PROD

N

q

d

d1

d2

d3

B

betaSq

normBoundSq

signFailTolerance

keyNormBoundSq

primeCheck

basisType

sparse

keyGenAlg

hashAlg

polyType

Constructor Detail

NTRUSigningKeyGenerationParameters

NTRUSigningKeyGenerationParameters

NTRUSigningKeyGenerationParameters

Method Detail

writeTo

getSigningParameters

clone

hashCode

equals

toString