# 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