Class X509EncodedKeySpec

java.lang.Object

java.security.spec.EncodedKeySpec

java.security.spec.X509EncodedKeySpec

All Implemented Interfaces:: BinaryEncodable^PREVIEW, KeySpec

public non-sealed class X509EncodedKeySpec extends EncodedKeySpec implements BinaryEncodablePREVIEW

This class represents the ASN.1 encoding of a public key, encoded according to the ASN.1 type SubjectPublicKeyInfo. The SubjectPublicKeyInfo syntax is defined in the X.509 standard as follows:

SubjectPublicKeyInfo ::= SEQUENCE {
  algorithm AlgorithmIdentifier,
  subjectPublicKey BIT STRING }

Since:

1.2

See Also:

Constructor Summary

Constructor	Description
`X509EncodedKeySpec(byte[] encodedKey)`	Creates a new `X509EncodedKeySpec` with the given encoded key.
`X509EncodedKeySpec(byte[] encodedKey, String algorithm)`	Creates a new `X509EncodedKeySpec` with the given encoded key.

Method Summary

Modifier and Type	Method	Description
`byte[]`	`getEncoded()`	Returns the key bytes, encoded according to the X.509 standard.
`final String`	`getFormat()`	Returns the name of the encoding format associated with this key specification.

Methods declared in class EncodedKeySpec

getAlgorithm

Modifier and Type	Method	Description
`String`	`getAlgorithm()`	Returns the name of the algorithm of the encoded key.

Methods declared in class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Modifier and Type	Method	Description
`protected Object`	`clone()`	Creates and returns a copy of this object.
`boolean`	`equals(Object obj)`	Indicates whether some other object is "equal to" this one.
`protected void`	`finalize()`	Deprecated, for removal: This API element is subject to removal in a future version. Finalization is deprecated and subject to removal in a future release.
`final Class<?>`	`getClass()`	Returns the runtime class of this `Object`.
`int`	`hashCode()`	Returns a hash code value for this object.
`final void`	`notify()`	Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()`	Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()`	Returns a string representation of the object.
`final void`	`wait()`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
`final void`	`wait(long timeoutMillis)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis, int nanos)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

Constructor Details

X509EncodedKeySpec

public X509EncodedKeySpec(byte[] encodedKey)

Creates a new X509EncodedKeySpec with the given encoded key.

Parameters:: encodedKey - the key, which is assumed to be encoded according to the X.509 standard. The contents of the array are copied to protect against subsequent modification.
Throws:: NullPointerException - if encodedKey is null.

X509EncodedKeySpec

public X509EncodedKeySpec(byte[] encodedKey, String algorithm)

Creates a new X509EncodedKeySpec with the given encoded key. This constructor is useful when subsequent callers of the X509EncodedKeySpec object might not know the algorithm of the key.

Parameters:

encodedKey - the key, which is assumed to be encoded according to the X.509 standard. The contents of the array are copied to protect against subsequent modification.

algorithm - the algorithm name of the encoded public key. See the AsymmetricKey Algorithms section in the Java Security Standard Algorithm Names Specification for information about standard asymmetric key algorithm names.

Throws:

NullPointerException - if encodedKey or algorithm is null.

IllegalArgumentException - if algorithm is the empty string ""

Since:

External Specifications

Method Details

getEncoded

public byte[] getEncoded()

Returns the key bytes, encoded according to the X.509 standard.

Overrides:: getEncoded in class EncodedKeySpec
Returns:: the X.509 encoding of the key. Returns a new array each time this method is called.

getFormat

public final String getFormat()

Returns the name of the encoding format associated with this key specification.

Specified by:: getFormat in class EncodedKeySpec
Returns:: the string "X.509".

© 1993, 2025, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.