NTRUEncryptionParameters (core 1.58.0.0 API)

java.lang.Object
- org.spongycastle.pqc.crypto.ntru.NTRUEncryptionParameters

All Implemented Interfaces:

java.lang.Cloneable
```
public class NTRUEncryptionParameters
extends java.lang.Object
implements java.lang.Cloneable
```
A set of parameters for NtruEncrypt. Several predefined parameter sets are available and new ones can be created as well.

Field Summary

Fields
Modifier and Type	Field and Description
`int`	`bufferLenBits`
`int`	`c`
`int`	`db`
`int`	`df`
`int`	`df1`
`int`	`df2`
`int`	`df3`
`int`	`dg`
`int`	`dm0`
`int`	`dr`
`int`	`dr1`
`int`	`dr2`
`int`	`dr3`
`boolean`	`fastFp`
`Digest`	`hashAlg`
`boolean`	`hashSeed`
`int`	`maxMsgLenBytes`
`int`	`minCallsMask`
`int`	`minCallsR`
`int`	`N`
`byte[]`	`oid`
`int`	`pkLen`
`int`	`polyType`
`int`	`q`
`boolean`	`sparse`

Constructor Summary

Constructors
Constructor and Description
`NTRUEncryptionParameters(java.io.InputStream is)` Reads a parameter set from an input stream.
`NTRUEncryptionParameters(int N, int q, int df, int dm0, int db, int c, int minCallsR, int minCallsMask, boolean hashSeed, byte[] oid, boolean sparse, boolean fastFp, Digest hashAlg)` Constructs a parameter set that uses ternary private keys (i.e.
`NTRUEncryptionParameters(int N, int q, int df1, int df2, int df3, int dm0, int db, int c, int minCallsR, int minCallsMask, boolean hashSeed, byte[] oid, boolean sparse, boolean fastFp, 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
`NTRUEncryptionParameters`	`clone()`
`boolean`	`equals(java.lang.Object obj)`
`int`	`getMaxMessageLength()` Returns the maximum length a plaintext message can be with this parameter set.
`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
```
  - df
```
public int df
```
  - df1
```
public int df1
```
  - df2
```
public int df2
```
  - df3
```
public int df3
```
  - dr
```
public int dr
```
  - dr1
```
public int dr1
```
  - dr2
```
public int dr2
```
  - dr3
```
public int dr3
```
  - dg
```
public int dg
```
  - maxMsgLenBytes
```
public int maxMsgLenBytes
```
  - db
```
public int db
```
  - bufferLenBits
```
public int bufferLenBits
```
  - dm0
```
public int dm0
```
  - pkLen
```
public int pkLen
```
  - c
```
public int c
```
  - minCallsR
```
public int minCallsR
```
  - minCallsMask
```
public int minCallsMask
```
  - hashSeed
```
public boolean hashSeed
```
  - oid
```
public byte[] oid
```
  - sparse
```
public boolean sparse
```
  - fastFp
```
public boolean fastFp
```
  - polyType
```
public int polyType
```
  - hashAlg
```
public Digest hashAlg
```
- Constructor Detail
  - NTRUEncryptionParameters
```
public NTRUEncryptionParameters(int N,
                                int q,
                                int df,
                                int dm0,
                                int db,
                                int c,
                                int minCallsR,
                                int minCallsMask,
                                boolean hashSeed,
                                byte[] oid,
                                boolean sparse,
                                boolean fastFp,
                                Digest hashAlg)
```
    Constructs a parameter set that uses ternary private keys (i.e. polyType=SIMPLE).
    
    Parameters:
    
    N - number of polynomial coefficients
    
    q - modulus
    
    df - number of ones in the private polynomial f
    
    dm0 - minimum acceptable number of -1's, 0's, and 1's in the polynomial m' in the last encryption step
    
    db - number of random bits to prepend to the message
    
    c - a parameter for the Index Generation Function (IndexGenerator)
    
    minCallsR - minimum number of hash calls for the IGF to make
    
    minCallsMask - minimum number of calls to generate the masking polynomial
    
    hashSeed - whether to hash the seed in the MGF first (true) or use the seed directly (false)
    
    oid - three bytes that uniquely identify the parameter set
    
    sparse - whether to treat ternary polynomials as sparsely populated (SparseTernaryPolynomial vs DenseTernaryPolynomial)
    
    fastFp - whether f=1+p*F for a ternary F (true) or f is ternary (false)
    
    hashAlg - a valid identifier for a java.security.MessageDigest instance such as SHA-256. The MessageDigest must support the getDigestLength() method.
  - NTRUEncryptionParameters
```
public NTRUEncryptionParameters(int N,
                                int q,
                                int df1,
                                int df2,
                                int df3,
                                int dm0,
                                int db,
                                int c,
                                int minCallsR,
                                int minCallsMask,
                                boolean hashSeed,
                                byte[] oid,
                                boolean sparse,
                                boolean fastFp,
                                Digest hashAlg)
```
    Constructs a parameter set that uses product-form private keys (i.e. polyType=PRODUCT).
    
    Parameters:
    
    N - number of polynomial coefficients
    
    q - modulus
    
    df1 - number of ones in the private polynomial f1
    
    df2 - number of ones in the private polynomial f2
    
    df3 - number of ones in the private polynomial f3
    
    dm0 - minimum acceptable number of -1's, 0's, and 1's in the polynomial m' in the last encryption step
    
    db - number of random bits to prepend to the message
    
    c - a parameter for the Index Generation Function (IndexGenerator)
    
    minCallsR - minimum number of hash calls for the IGF to make
    
    minCallsMask - minimum number of calls to generate the masking polynomial
    
    hashSeed - whether to hash the seed in the MGF first (true) or use the seed directly (false)
    
    oid - three bytes that uniquely identify the parameter set
    
    sparse - whether to treat ternary polynomials as sparsely populated (SparseTernaryPolynomial vs DenseTernaryPolynomial)
    
    fastFp - whether f=1+p*F for a ternary F (true) or f is ternary (false)
    
    hashAlg - a valid identifier for a java.security.MessageDigest instance such as SHA-256
  - NTRUEncryptionParameters
```
public NTRUEncryptionParameters(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
  - clone
```
public NTRUEncryptionParameters clone()
```
    Overrides:
    
    clone in class java.lang.Object
  - getMaxMessageLength
```
public int getMaxMessageLength()
```
    Returns the maximum length a plaintext message can be with this parameter set.
    
    Returns:
    
    the maximum length in bytes
  - 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
  - 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 NTRUEncryptionParameters

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

N

q

df

df1

df2

df3

dr

dr1

dr2

dr3

dg

maxMsgLenBytes

db

bufferLenBits

dm0

pkLen

c

minCallsR

minCallsMask

hashSeed

oid

sparse

fastFp

polyType

hashAlg

Constructor Detail

NTRUEncryptionParameters

NTRUEncryptionParameters

NTRUEncryptionParameters

Method Detail

clone

getMaxMessageLength

writeTo

hashCode

equals

toString