java.lang.Object
- org.bouncycastle.crypto.KeyGenerationParameters
- - org.bouncycastle.pqc.crypto.ntru.NTRUEncryptionKeyGenerationParameters

All Implemented Interfaces:

java.lang.Cloneable
```
public class NTRUEncryptionKeyGenerationParameters
extends KeyGenerationParameters
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	Description
`static NTRUEncryptionKeyGenerationParameters`	`APR2011_439`	A parameter set that gives 128 bits of security and uses simple ternary polynomials.
`static NTRUEncryptionKeyGenerationParameters`	`APR2011_439_FAST`	Like `APR2011_439`, this parameter set gives 128 bits of security but uses product-form polynomials and `f=1+pF`.
`static NTRUEncryptionKeyGenerationParameters`	`APR2011_743`	A parameter set that gives 256 bits of security and uses simple ternary polynomials.
`static NTRUEncryptionKeyGenerationParameters`	`APR2011_743_FAST`	Like `APR2011_743`, this parameter set gives 256 bits of security but uses product-form polynomials and `f=1+pF`.
`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`
`static NTRUEncryptionKeyGenerationParameters`	`EES1087EP2`	A conservative (in terms of security) parameter set that gives 256 bits of security and is optimized for key size.
`static NTRUEncryptionKeyGenerationParameters`	`EES1171EP1`	A conservative (in terms of security) parameter set that gives 256 bits of security and is a tradeoff between key size and encryption/decryption speed.
`static NTRUEncryptionKeyGenerationParameters`	`EES1499EP1`	A conservative (in terms of security) parameter set that gives 256 bits of security and is optimized for encryption/decryption speed.
`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	Description
`NTRUEncryptionKeyGenerationParameters(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.
`NTRUEncryptionKeyGenerationParameters(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, java.security.SecureRandom random)`	Constructs a parameter set that uses ternary private keys (i.e.
`NTRUEncryptionKeyGenerationParameters(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.
`NTRUEncryptionKeyGenerationParameters(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, java.security.SecureRandom random)`	Constructs a parameter set that uses product-form private keys (i.e.
`NTRUEncryptionKeyGenerationParameters(java.io.InputStream is)`	Reads a parameter set from an input stream.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`NTRUEncryptionKeyGenerationParameters`	`clone()`
`boolean`	`equals(java.lang.Object obj)`
`NTRUEncryptionParameters`	`getEncryptionParameters()`
`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 org.bouncycastle.crypto.KeyGenerationParameters
getRandom, getStrength

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

- Field Detail
  - EES1087EP2
```
public static final NTRUEncryptionKeyGenerationParameters EES1087EP2
```
    A conservative (in terms of security) parameter set that gives 256 bits of security and is optimized for key size. Uses CryptoServicesRegistrar.getSecureRandom() as an entropy source (but the value present at class load time).
  - EES1171EP1
```
public static final NTRUEncryptionKeyGenerationParameters EES1171EP1
```
    A conservative (in terms of security) parameter set that gives 256 bits of security and is a tradeoff between key size and encryption/decryption speed. Uses CryptoServicesRegistrar.getSecureRandom() as an entropy source (but the value present at class load time).
  - EES1499EP1
```
public static final NTRUEncryptionKeyGenerationParameters EES1499EP1
```
    A conservative (in terms of security) parameter set that gives 256 bits of security and is optimized for encryption/decryption speed. Uses CryptoServicesRegistrar.getSecureRandom() as an entropy source (but the value present at class load time).
  - APR2011_439
```
public static final NTRUEncryptionKeyGenerationParameters APR2011_439
```
    A parameter set that gives 128 bits of security and uses simple ternary polynomials. Uses CryptoServicesRegistrar.getSecureRandom() as an entropy source (but the value present at class load time).
  - APR2011_439_FAST
```
public static final NTRUEncryptionKeyGenerationParameters APR2011_439_FAST
```
    Like APR2011_439, this parameter set gives 128 bits of security but uses product-form polynomials and f=1+pF. Uses CryptoServicesRegistrar.getSecureRandom() as an entropy source (but the value present at class load time).
  - APR2011_743
```
public static final NTRUEncryptionKeyGenerationParameters APR2011_743
```
    A parameter set that gives 256 bits of security and uses simple ternary polynomials. Uses CryptoServicesRegistrar.getSecureRandom() as an entropy source (but the value present at class load time).
  - APR2011_743_FAST
```
public static final NTRUEncryptionKeyGenerationParameters APR2011_743_FAST
```
    Like APR2011_743, this parameter set gives 256 bits of security but uses product-form polynomials and f=1+pF. Uses CryptoServicesRegistrar.getSecureRandom() as an entropy source (but the value present at class load time).
  - 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
  - NTRUEncryptionKeyGenerationParameters
```
public NTRUEncryptionKeyGenerationParameters(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,
                                             java.security.SecureRandom random)
```
    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.
    
    random - entropy source, if null uses CryptoServicesRegistrar.getSecureRandom()
  - NTRUEncryptionKeyGenerationParameters
```
public NTRUEncryptionKeyGenerationParameters(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.
  - NTRUEncryptionKeyGenerationParameters
```
public NTRUEncryptionKeyGenerationParameters(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,
                                             java.security.SecureRandom random)
```
    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
    
    random - entropy source, if null uses CryptoServicesRegistrar.getSecureRandom()
  - NTRUEncryptionKeyGenerationParameters
```
public NTRUEncryptionKeyGenerationParameters(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). Uses CryptoServicesRegistrar.getSecureRandom() as an entropy source.
    
    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
  - NTRUEncryptionKeyGenerationParameters
```
public NTRUEncryptionKeyGenerationParameters(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
  - getEncryptionParameters
```
public NTRUEncryptionParameters getEncryptionParameters()
```
  - clone
```
public NTRUEncryptionKeyGenerationParameters 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 NTRUEncryptionKeyGenerationParameters

Field Summary

Constructor Summary

Method Summary

Methods inherited from class org.bouncycastle.crypto.KeyGenerationParameters

Methods inherited from class java.lang.Object

Field Detail

EES1087EP2

EES1171EP1

EES1499EP1

APR2011_439

APR2011_439_FAST

APR2011_743

APR2011_743_FAST

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

NTRUEncryptionKeyGenerationParameters

NTRUEncryptionKeyGenerationParameters

NTRUEncryptionKeyGenerationParameters

NTRUEncryptionKeyGenerationParameters

NTRUEncryptionKeyGenerationParameters

Method Detail

getEncryptionParameters

clone

getMaxMessageLength

writeTo

hashCode

equals

toString