Package org.bouncycastle.pqc.crypto.ntru

## Class NTRUEncryptionPrivateKeyParameters

- java.lang.Object
- - org.bouncycastle.crypto.params.AsymmetricKeyParameter
  - - org.bouncycastle.pqc.crypto.ntru.NTRUEncryptionKeyParameters
    - - org.bouncycastle.pqc.crypto.ntru.NTRUEncryptionPrivateKeyParameters

- All Implemented Interfaces:
    `CipherParameters`

      public class NTRUEncryptionPrivateKeyParameters
      extends NTRUEncryptionKeyParameters

  A NtruEncrypt private key is essentially a polynomial named `f` which takes different forms depending on whether product-form polynomials are used, and on `fastP`
  The inverse of `f` modulo `p` is precomputed on initialization.

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `IntegerPolynomial` | `fp` |
    `IntegerPolynomial` | `h` |
    `Polynomial` | `t` |

    - ### Fields inherited from class org.bouncycastle.pqc.crypto.ntru.NTRUEncryptionKeyParameters

      `params`

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `NTRUEncryptionPrivateKeyParameters​(byte[] b, NTRUEncryptionParameters params)` | Converts a byte array to a polynomial `f` and constructs a new private key
    `NTRUEncryptionPrivateKeyParameters​(java.io.InputStream is, NTRUEncryptionParameters params)` | Reads a polynomial `f` from an input stream and constructs a new private key
    `NTRUEncryptionPrivateKeyParameters​(IntegerPolynomial h, Polynomial t, IntegerPolynomial fp, NTRUEncryptionParameters params)` | Constructs a new private key from a polynomial

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `boolean` | `equals​(java.lang.Object obj)` |
    `byte[]` | `getEncoded()` | Converts the key to a byte array
    `int` | `hashCode()` |
    `void` | `writeTo​(java.io.OutputStream os)` | Writes the key to an output stream

    - ### Methods inherited from class org.bouncycastle.pqc.crypto.ntru.NTRUEncryptionKeyParameters

      `getParameters`

    - ### Methods inherited from class org.bouncycastle.crypto.params.AsymmetricKeyParameter

      `isPrivate`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### t

          public Polynomial t

    - #### fp

          public IntegerPolynomial fp

    - #### h

          public IntegerPolynomial h

  - ### Constructor Detail

    - #### NTRUEncryptionPrivateKeyParameters

          public NTRUEncryptionPrivateKeyParameters​(IntegerPolynomial h,
                                                    Polynomial t,
                                                    IntegerPolynomial fp,
                                                    NTRUEncryptionParameters params)

      Constructs a new private key from a polynomial
      Parameters:
        `h` - the public polynomial for the key.
        `t` - the polynomial which determines the key: if `fastFp=true`, `f=1+3t`; otherwise, `f=t`
        `fp` - the inverse of `f`
        `params` - the NtruEncrypt parameters to use

    - #### NTRUEncryptionPrivateKeyParameters

          public NTRUEncryptionPrivateKeyParameters​(byte[] b,
                                                    NTRUEncryptionParameters params)
                                             throws java.io.IOException

      Converts a byte array to a polynomial `f` and constructs a new private key
      Parameters:
        `b` - an encoded polynomial
        `params` - the NtruEncrypt parameters to use
      Throws:
        `java.io.IOException`
      See Also:
        `getEncoded()`

    - #### NTRUEncryptionPrivateKeyParameters

          public NTRUEncryptionPrivateKeyParameters​(java.io.InputStream is,
                                                    NTRUEncryptionParameters params)
                                             throws java.io.IOException

      Reads a polynomial `f` from an input stream and constructs a new private key
      Parameters:
        `is` - an input stream
        `params` - the NtruEncrypt parameters to use
      Throws:
        `java.io.IOException`
      See Also:
        `writeTo(OutputStream)`

  - ### Method Detail

    - #### getEncoded

          public byte[] getEncoded()

      Converts the key to a byte array
      Returns:
        the encoded key
      See Also:
        `NTRUEncryptionPrivateKeyParameters(byte[], NTRUEncryptionParameters)`

    - #### writeTo

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

      Writes the key to an output stream
      Parameters:
        `os` - an output stream
      Throws:
        `java.io.IOException`
      See Also:
        `NTRUEncryptionPrivateKeyParameters(InputStream, NTRUEncryptionParameters)`

    - #### 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`