XECPrivateKey

public interface XECPrivateKey
implements XECKey, PrivateKey

java.security.interfaces.XECPrivateKey

An interface for an elliptic curve private key as defined by RFC 7748. These keys are distinct from the keys represented by ECPrivateKey, and they are intended for use with algorithms based on RFC 7748 such as the XDH KeyAgreement algorithm. An XEC private key is an encoded scalar value as described in RFC 7748. The decoding procedure defined in this RFC includes an operation that forces certain bits of the key to either 1 or 0. This operation is known as "pruning" or "clamping" the private key. Arrays returned by this interface are unpruned, and implementations will need to prune the array before using it in any numerical operations.

Summary

Inherited constants

From interface java.security.PrivateKey

long

serialVersionUID

This constant was deprecated in API level 34. A serialVersionUID field in an interface is ineffectual. Do not use; no replacement.

From interface java.security.Key

long

serialVersionUID

This constant was deprecated in API level 34. A serialVersionUID field in an interface is ineffectual. Do not use; no replacement.

Public methods
`abstract Optional<byte[]>`	`getScalar()` Get the scalar value encoded as an unpruned byte array.

Inherited methods

From interface


        
          java.security.interfaces.XECKey


        abstract
        
        
        
        
        AlgorithmParameterSpec


      getParams()

Returns the algorithm parameters associated with the key.

From interface


        
          java.security.Key

`abstract String`	`getAlgorithm()` Returns the standard algorithm name for this key.
`abstract byte[]`	`getEncoded()` Returns the key in its primary encoding format, or null if this key does not support encoding.
`abstract String`	`getFormat()` Returns the name of the primary encoding format of this key, or null if this key does not support encoding.

From interface


        
          javax.security.auth.Destroyable

`default void`	`destroy()` Destroy this `Object`.
`default boolean`	`isDestroyed()` Determine if this `Object` has been destroyed.

Public methods

getScalar

Added in API level 33

public abstract Optional<byte[]> getScalar ()

Get the scalar value encoded as an unpruned byte array. A new copy of the array is returned each time this method is called.

Returns
`Optional<byte[]>`	the unpruned encoded scalar value, or an empty Optional if the scalar cannot be extracted (e.g. if the provider is a hardware token and the private key is not allowed to leave the crypto boundary).