Skip navigation links

oracle.security.crypto.core
Class DHPublicKey

java.lang.Object
oracle.security.crypto.core.DHKey
oracle.security.crypto.core.DHPublicKey

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, java.lang.Cloneable, ASN1Object, Key, PublicKey, Streamable

public class DHPublicKey

extends DHKey

implements PublicKey

Diffie-Hellman public key as described in ANSI X9.42.

The Diffie-Hellman public key contains a DHParams and a public key value y is represented as the X509 type SubjectPublicKeyInfo.

See Also:

DHKey, DHPublicKey, DHParams, Serialized Form

Field Summary

Fields inherited from class oracle.security.crypto.core.DHKey

params

Constructor Summary

DHPublicKey()
Constructs a new, uninitialized instance.

DHPublicKey(java.math.BigInteger y, DHParams params)
Constructs a new instance with the given set of parameters and value of y.

DHPublicKey(java.io.InputStream is)
Constructs a new instance by reading its encoding from the given input stream.

Method Summary

java.lang.Object	clone() Create a deep clone of this DHKey object.
void	erase() Erases the sensitive key material of a private or symmetric key, making the key un-usable.
AlgorithmIdentifier	getAlgID() Returns the algorithm identifier for this key.
boolean	getAllowExport() Always returns true.
ASN1Object	getContents() Returns the contents of this key.
byte[]	getEncoded() Returns the encoded form of this key.
java.lang.String	getFormat() Returns a string which indicates the format of this object's encoding.
java.math.BigInteger	getY() Gets the public key value y.
void	initialize(AlgorithmIdentifier algID, ASN1Object contents) Initializes this instance from the given algorithm paramters and key contents.
void	input(java.io.InputStream is) Inputs a DHPublicKey object by reading its encoding from the given input stream.
int	length() Gets the length of the encoding of this object.
void	output(java.io.OutputStream os) Outputs the ASN1 encoding of this object to a given output stream.
void	setParams(DHParams params) Sets the parameters for the Diffie-Hellman key.
java.lang.String	toString() Returns a string representation of this object.

Methods inherited from class oracle.security.crypto.core.DHKey

getAlgorithm, getBitLength, getParams, readExternal, writeExternal

Methods inherited from class java.lang.Object

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

Methods inherited from interface oracle.security.crypto.core.Key

getAlgorithm, getBitLength

Methods inherited from interface java.io.Externalizable

readExternal, writeExternal

Constructor Detail

DHPublicKey

public DHPublicKey()

Constructs a new, uninitialized instance.

DHPublicKey

public DHPublicKey(java.math.BigInteger y,
                   DHParams params)

Constructs a new instance with the given set of parameters and value of y.

Parameters:

y - the value of y

params - the DHParams of this DHPublicKey

DHPublicKey

public DHPublicKey(java.io.InputStream is)
            throws java.io.IOException

Constructs a new instance by reading its encoding from the given input stream.

Parameters:

is - the input stream from which this object will be read

Throws:

java.io.IOException - If an input exception occured

Method Detail

getEncoded

public byte[] getEncoded()

Description copied from interface: Key

Returns the encoded form of this key.

Specified by:

getEncoded in interface Key

getAllowExport

public boolean getAllowExport()

Always returns true.

Specified by:

getAllowExport in interface Key

Returns:

Whether or not this key's material may be exported in plaintext.

Since:

3.0

See Also:

FIPS_140_2.getAllowKeyExport()

getFormat

public java.lang.String getFormat()

Returns a string which indicates the format of this object's encoding.

Specified by:

getFormat in interface Key

Returns:

"X.509"

erase

public void erase()

Description copied from interface: Key

Erases the sensitive key material of a private or symmetric key, making the key un-usable. Keys may be erased multiple times with no consequences.

Note: After erase() has been invoked, no other methods of the Key object are guaranteed to function correctly. In particular, invoking another method after erase() may result in a NullPointerException being thrown.

Specified by:

erase in interface Key

clone

public java.lang.Object clone()

Description copied from class: DHKey

Create a deep clone of this DHKey object.

Specified by:

clone in interface Key

Specified by:

clone in class DHKey

Returns:

A deep clone of the Key instance.

initialize

public void initialize(AlgorithmIdentifier algID,
                       ASN1Object contents)
                throws AlgorithmIdentifierException,
                       InvalidInputException

Description copied from interface: PublicKey

Initializes this instance from the given algorithm paramters and key contents.

Specified by:

initialize in interface PublicKey

Throws:

AlgorithmIdentifierException

InvalidInputException

getAlgID

public AlgorithmIdentifier getAlgID()

Description copied from interface: PublicKey

Returns the algorithm identifier for this key.

Specified by:

getAlgID in interface PublicKey

getContents

public ASN1Object getContents()

Description copied from interface: PublicKey

Returns the contents of this key.

Specified by:

getContents in interface PublicKey

setParams

public void setParams(DHParams params)

Description copied from class: DHKey

Sets the parameters for the Diffie-Hellman key. This method is used to set Diffie-Hellman parameters common to a group of users which are known from application context.

Specified by:

setParams in class DHKey

Parameters:

params - An instance of DHParams.

getY

public java.math.BigInteger getY()

Gets the public key value y.

Returns:

The public key value y.

toString

public java.lang.String toString()

Returns a string representation of this object.

Overrides:

toString in class java.lang.Object

Returns:

A string representation of this object.

input

public void input(java.io.InputStream is)
           throws java.io.IOException

Inputs a DHPublicKey object by reading its encoding from the given input stream.

Specified by:

input in interface Streamable

Parameters:

is - The input stream from which this object will be read

Throws:

java.io.IOException - If an input exception occured.

output

public void output(java.io.OutputStream os)
            throws java.io.IOException

Outputs the ASN1 encoding of this object to a given output stream.

Specified by:

output in interface Streamable

Parameters:

os - The output stream to which the encoding of this object will be written.

Throws:

java.io.IOException - If an output exception occured.

length

public int length()

Gets the length of the encoding of this object.

Specified by:

length in interface Streamable

Returns:

The length of the ASN1 encoding of this object.

Skip navigation links