# Interface RSAPrivateKey

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

All Known Subinterfaces:
  `RSAMultiPrimePrivateCrtKey, RSAPrivateCrtKey`

public interface RSAPrivateKey extends PrivateKey, RSAKey
The interface to an RSA private key.

Since:
  1.2
See Also:
  - `RSAPrivateCrtKey`

## 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 AlgorithmParameterSpec`
`getParams()`
Returns the parameters associated with this key.
`BigInteger`
`getPrivateExponent()`
Returns the private exponent.

### Methods declared in interface Destroyable

`destroy, isDestroyed`

### Methods declared in interface Key

`getAlgorithm, getEncoded, getFormat`

### Methods declared in interface RSAKey

`getModulus`

## Field Details

### serialVersionUID

@Deprecated static final long serialVersionUID
Deprecated.
A `serialVersionUID` field in an interface is ineffectual. Do not use; no replacement.
The type fingerprint that is set to indicate serialization compatibility with a previous version of the type.

See Also:
  - Constant Field Values

## Method Details

### getPrivateExponent

BigInteger getPrivateExponent()
Returns the private exponent.

Returns:
  the private exponent

### getParams

default AlgorithmParameterSpec 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 `RSAKey`
Implementation Requirements:
  The default implementation returns `null`.
Returns:
  the associated parameters, may be `null`
Since:
  11