[ Web Proxy ]

Viewing: https://developer.android.com/reference/java/security/PrivateKey

PrivateKey | API reference | Android Developers Skip to main content

[Android Developers]

Essentials Design & Plan Develop Google Play Blog

English
Deutsch
Espaol Amrica Latina
Franais
Indonesia
Polski
Portugus Brasil
Ting Vit

Android Studio

Stay organized with collections Save and categorize content based on your preferences.

Added in API level 1

Summary: Constants | Inherited Constants | Inherited Methods

PrivateKey

public interface PrivateKey
implements Destroyable, Key

java.security.PrivateKey

Known indirect subclasses

DHPrivateKey, DSAPrivateKey, ECPrivateKey, EdECPrivateKey, RSAMultiPrimePrivateCrtKey, RSAPrivateCrtKey, RSAPrivateKey, XECPrivateKey

DHPrivateKey	The interface to a Diffie-Hellman private key.
DSAPrivateKey	The standard interface to a DSA private key.
ECPrivateKey	The interface to an elliptic curve (EC) private key.
EdECPrivateKey	An interface for an elliptic curve private key as defined by RFC 8032: Edwards-Curve Digital Signature Algorithm (EdDSA).
RSAMultiPrimePrivateCrtKey	The interface to an RSA multi-prime private key, as defined in the PKCS#1 v2.2 standard, using the Chinese Remainder Theorem (CRT) information values.
RSAPrivateCrtKey	The interface to an RSA private key, as defined in the PKCS#1 v2.2 standard, using the Chinese Remainder Theorem (CRT) information values.
RSAPrivateKey	The interface to an RSA private key.
XECPrivateKey	An interface for an elliptic curve private key as defined by RFC 7748.

A private key. The purpose of this interface is to group (and provide type safety for) all private key interfaces.

Note: The specialized private key interfaces extend this interface. See, for example, the DSAPrivateKey interface in java.security.interfaces.

Implementations should override the default destroy and isDestroyed methods from the Destroyable interface to enable sensitive key information to be destroyed, cleared, or in the case where such information is immutable, unreferenced. Finally, since PrivateKey is Serializable, implementations should also override ObjectOutputStream.writeObject(java.lang.Object) to prevent keys that have been destroyed from being serialized.

See also:

Summary

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

Inherited constants

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.

Inherited methods

From interface


        
          javax.security.auth.Destroyable

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

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.

Constants

serialVersionUID

Added in API level 1
Deprecated in API level 34

public static final long serialVersionUID

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

The class fingerprint that is set to indicate serialization compatibility with a previous version of the class.

Constant Value: 6034044314589513430 (0x53bd3b559a12c6d6)

Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.

Last updated 2026-08-03 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2026-08-03 UTC."],[],[]]