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:: 9
See Also:: Serialized Form

Constructor Summary

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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`.
`String`	`toString()`	Returns an informative textual representation of this `EncryptionKey`.

Methods declared in class java.lang.Object

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

Methods declared in interface javax.security.auth.Destroyable

isDestroyed

Constructor Detail

EncryptionKey

public EncryptionKey(byte[] keyBytes,
                     int keyType)

Constructs an 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:

none: for etype equal to 0
unknown: for etype greater than 0 but unsupported by the implementation
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.

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