javax.security.auth.kerberos

Class EncryptionKey

java.lang.Object

javax.security.auth.kerberos.EncryptionKey

All Implemented Interfaces:

Serializable, Key, SecretKey, Destroyable

public final class EncryptionKey
extends Object
implements SecretKey

This class encapsulates an EncryptionKey used in Kerberos.

An EncryptionKey is defined in Section 4.2.9 of the Kerberos Protocol Specification (RFC 4120) as:

     EncryptionKey   ::= SEQUENCE {
             keytype         [0] Int32 -- actually encryption type --,
             keyvalue        [1] OCTET STRING
     }
 

The key material of an EncryptionKey is defined as the value of the keyValue above.

Since:

1.9

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
EncryptionKey(byte[] keyBytes, int keyType) Constructs a EncryptionKey from the given bytes and the key type.

Method Summary

Modifier and Type	Method and Description
void	destroy() Destroys this key by clearing out the key material of this key.
boolean	equals(Object other) Compares the specified object with this key for equality.
String	getAlgorithm() Returns the standard algorithm name for this key.
byte[]	getEncoded() Returns the key material of this key.
String	getFormat() Returns the name of the encoding format for this key.
int	getKeyType() Returns the key type for this key.
int	hashCode() Returns a hash code for this EncryptionKey.
boolean	isDestroyed() Determine if this Object has been destroyed.
String	toString() Returns an informative textual representation of this EncryptionKey.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

EncryptionKey

public EncryptionKey(byte[] keyBytes,
                     int keyType)

Constructs a EncryptionKey from the given bytes and the key type.

The contents of the byte array are copied; subsequent modification of the byte array does not affect the newly created key.

Parameters:

keyBytes - the key material for the key

keyType - the key type for the key as defined by the Kerberos protocol specification.

Throws:

NullPointerException - if keyBytes is null

Method Detail

getKeyType

public int getKeyType()

Returns the key type for this key.

Returns:

the key type.

Throws:

IllegalStateException - if the key is destroyed

getAlgorithm

public String getAlgorithm()

Returns the standard algorithm name for this key. The algorithm names are the encryption type string defined on the IANA Kerberos Encryption Type Numbers page.

This method can return the following value not defined on the IANA page:

1. none: for etype equal to 0
2. unknown: for etype greater than 0 but unsupported by the implementation
3. private: for etype smaller than 0

Specified by:

getAlgorithm in interface Key

Returns:

the name of the algorithm associated with this key.

Throws:

IllegalStateException - if the key is destroyed

getFormat

public String getFormat()

Returns the name of the encoding format for this key.

Specified by:

getFormat in interface Key

Returns:

the String "RAW"

Throws:

IllegalStateException - if the key is destroyed

getEncoded

public byte[] getEncoded()

Returns the key material of this key.

Specified by:

getEncoded in interface Key

Returns:

a newly allocated byte array that contains the key material

Throws:

IllegalStateException - if the key is destroyed

destroy

public void destroy()
             throws DestroyFailedException

Destroys this key by clearing out the key material of this key.

Specified by:

destroy in interface Destroyable

Throws:

DestroyFailedException - if some error occurs while destorying this key.

isDestroyed

public boolean isDestroyed()

Description copied from interface: Destroyable

Determine if this Object has been destroyed.

Specified by:

isDestroyed in interface Destroyable

Returns:

true if this Object has been destroyed, false otherwise.

toString

public String toString()

Returns an informative textual representation of this EncryptionKey.

Overrides:

toString in class Object

Returns:

an informative textual representation of this EncryptionKey.

hashCode

public int hashCode()

Returns a hash code for this EncryptionKey.

Overrides:

hashCode in class Object

Returns:

a hash code for this EncryptionKey.

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

equals

public boolean equals(Object other)

Compares the specified object with this key for equality. Returns true if the given object is also an EncryptionKey and the two EncryptionKey instances are equivalent. More formally two EncryptionKey instances are equal if they have equal key types and key material. A destroyed EncryptionKey object is only equal to itself.

Overrides:

equals in class Object

Parameters:

other - the object to compare to

Returns:

true if the specified object is equal to this EncryptionKey, false otherwise.

See Also:

Object.hashCode(), HashMap