Class X509EncodedKeySpec

java.lang.Object

java.security.spec.EncodedKeySpec

java.security.spec.X509EncodedKeySpec

All Implemented Interfaces:: DEREncodable^PREVIEW, KeySpec

public non-sealed class X509EncodedKeySpec extends EncodedKeySpec implements DEREncodablePREVIEW

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

Methods declared in class Object

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

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".

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https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/security/spec/X509EncodedKeySpec.html