KeyRep (Java SE 25 & JDK 25)
Description: declaration: module: java.base, package: java.security, class: KeyRep
Keywords: java.security.KeyRep class

# Class KeyRep

java.lang.Object
java.security.KeyRep

All Implemented Interfaces:
  `Serializable`

public class KeyRep extends Object implements Serializable
Standardized representation for serialized Key objects.

Note that a serialized Key may contain sensitive information which should not be exposed in untrusted environments. See the Security Appendix of the Java Object Serialization Specification for more information.

Since:
  1.5
External Specifications
  - Java Object Serialization Specification
See Also:
  - `Key`
  - `KeyFactory`
  - `SecretKeySpec`
  - `X509EncodedKeySpec`
  - `PKCS8EncodedKeySpec`
  - Serialized Form

- ## Nested Class Summary

  Nested Classes
  Modifier and Type
  Class
  Description
  `static enum`
  `KeyRep.Type`
  Key type.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `KeyRep(KeyRep.Type type, String algorithm, String format, byte[] encoded)`
  Construct the alternate Key class.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `protected Object`
  `readResolve()`
  Resolve the Key object.

  ### Methods declared in class Object

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

- ## Constructor Details

  - ### KeyRep

    public KeyRep(KeyRep.Type type, String algorithm, String format, byte[] encoded)
    Construct the alternate Key class.
    Parameters:
      `type` - either one of Type.SECRET, Type.PUBLIC, or Type.PRIVATE
      `algorithm` - the algorithm returned from `Key.getAlgorithm()`
      `format` - the encoding format returned from `Key.getFormat()`
      `encoded` - the encoded bytes returned from `Key.getEncoded()`
    Throws:
      `NullPointerException` - if type is `null`, if algorithm is `null`, if format is `null`, or if encoded is `null`

- ## Method Details

  - ### readResolve

    protected Object readResolve() throws ObjectStreamException
    Resolve the Key object.

    This method supports three Type/format combinations:

    - Type.SECRET/"RAW" - returns a SecretKeySpec object constructed using encoded key bytes and algorithm
    - Type.PUBLIC/"X.509" - gets a KeyFactory instance for the key algorithm, constructs an X509EncodedKeySpec with the encoded key bytes, and generates a public key from the spec
    - Type.PRIVATE/"PKCS#8" - gets a KeyFactory instance for the key algorithm, constructs a PKCS8EncodedKeySpec with the encoded key bytes, and generates a private key from the spec
    Returns:
      the resolved Key object
    Throws:
      `ObjectStreamException` - if the Type/format combination is unrecognized, if the algorithm, key format, or encoded key bytes are unrecognized/invalid, of if the resolution of the key fails for any reason