# Interface ECPrivateKey

All Superinterfaces:
  `AsymmetricKey, DEREncodablePREVIEW, Destroyable, ECKey, Key, PrivateKey, Serializable`

public interface ECPrivateKey extends PrivateKey, ECKey
The interface to an elliptic curve (EC) private key.

Since:
  1.5
See Also:
  - `PrivateKey`
  - `ECKey`

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final long`
  `serialVersionUID`
  Deprecated.
  A `serialVersionUID` field in an interface is ineffectual.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `default ECParameterSpec`
  `getParams()`
  Returns the parameters associated with this key.
  `BigInteger`
  `getS()`
  Returns the private value S.

  ### Methods declared in interface Destroyable

  `destroy, isDestroyed`

  ### Methods declared in interface Key

  `getAlgorithm, getEncoded, getFormat`

- ## Field Details

  - ### serialVersionUID

    @Deprecated static final long serialVersionUID
    Deprecated.
    A `serialVersionUID` field in an interface is ineffectual. Do not use; no replacement.
    The class fingerprint that is set to indicate serialization compatibility.
    See Also:
      - Constant Field Values

- ## Method Details

  - ### getS

    BigInteger getS()
    Returns the private value S.
    Returns:
      the private value S.

  - ### getParams

    default ECParameterSpec getParams()
    Returns the parameters associated with this key. The parameters are optional and may be either explicitly specified or implicitly created during key pair generation.
    Specified by:
      `getParams` in interface `AsymmetricKey`
    Specified by:
      `getParams` in interface `ECKey`
    Implementation Requirements:
      The default implementation returns `null`.
    Returns:
      the associated parameters, may be `null`