iaik.security.dh

Class ESDHPublicKeySpec

java.lang.Object

javax.crypto.spec.DHPublicKeySpec

iaik.security.dh.ESDHPublicKeySpec

All Implemented Interfaces:

java.security.spec.KeySpec

public class ESDHPublicKeySpec
extends javax.crypto.spec.DHPublicKeySpec

Diffie Hellman public key specification.

Attention: This is not a SUN implementation!

This class has been developed by IAIK according to the documentation publically available.
For SUN's documentation of this class see http://java.sun.com/security/JCE1.2/spec/apidoc/index.html

This class represents a Diffie Hellman public key specification. A key specification is a transparent representation of the key material constituting the key. A Diffie Hellman public key specification represents the public value y, and the Diffie Hellman parameters p (prime modulus), g (base generator), and l (length of the private value x).

See Also:

KeySpec, DHPrivateKeySpec

Constructor Summary

Constructors

Constructor and Description
ESDHPublicKeySpec(java.math.BigInteger y, java.math.BigInteger p, java.math.BigInteger g, java.math.BigInteger q) Creates a Diffie-Hellman public key specification based on given public value y, prime modulus p, base generator g and prime factor q.
ESDHPublicKeySpec(java.math.BigInteger y, java.math.BigInteger p, java.math.BigInteger g, java.math.BigInteger q, java.math.BigInteger j) Creates a Diffie-Hellman public key specification based on given public value y, prime modulus p, base generator g, prime factor q and subgroup factor j.
ESDHPublicKeySpec(java.math.BigInteger y, java.math.BigInteger p, java.math.BigInteger g, java.math.BigInteger q, java.math.BigInteger j, byte[] seed, int pgenCounter) Creates a Diffie-Hellman public key specification based on given public value y, prime modulus p, base generator g, prime factor q, subgroup factor j and the seed and counter used in the system parameter generation process.
ESDHPublicKeySpec(java.math.BigInteger y, java.math.BigInteger p, java.math.BigInteger g, java.math.BigInteger q, byte[] seed, int pgenCounter) Creates a Diffie-Hellman public key specification based on given public value y, prime modulus p, base generator g, prime factor q and the seed and counter used in the system parameter generation process.

Method Summary

Modifier and Type	Method and Description
java.math.BigInteger	getJ() Returns the subgroup factor j.
long	getL() This method overrides the method of the super class and always returns 0 since we don't use parameter L in ESDH.
int	getPGenCounter() Returns the counter used in the system parameter generation process.
java.math.BigInteger	getQ() Returns the prime factor q.
byte[]	getSeed() Returns the seed used in the system parameter generation process.

Methods inherited from class javax.crypto.spec.DHPublicKeySpec

getG, getP, getY

Methods inherited from class java.lang.Object

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

Constructor Detail

ESDHPublicKeySpec

public ESDHPublicKeySpec(java.math.BigInteger y,
                         java.math.BigInteger p,
                         java.math.BigInteger g,
                         java.math.BigInteger q)

Creates a Diffie-Hellman public key specification based on given public value y, prime modulus p, base generator g and prime factor q.

Parameters:

y - the public value

p - the prime modulus

g - the base generator

q - the prime factor

ESDHPublicKeySpec

public ESDHPublicKeySpec(java.math.BigInteger y,
                         java.math.BigInteger p,
                         java.math.BigInteger g,
                         java.math.BigInteger q,
                         java.math.BigInteger j)

Creates a Diffie-Hellman public key specification based on given public value y, prime modulus p, base generator g, prime factor q and subgroup factor j.

Parameters:

y - the public value

p - the prime modulus

g - the base generator

q - the prime factor

j - the subgroup factor

ESDHPublicKeySpec

public ESDHPublicKeySpec(java.math.BigInteger y,
                         java.math.BigInteger p,
                         java.math.BigInteger g,
                         java.math.BigInteger q,
                         byte[] seed,
                         int pgenCounter)

Creates a Diffie-Hellman public key specification based on given public value y, prime modulus p, base generator g, prime factor q and the seed and counter used in the system parameter generation process.

Parameters:

y - the public value

p - the prime modulus

g - the base generator

q - the prime factor

seed - the the seed used in the system parameter generation process

pgenCounter - the counter used in the system parameter generation process

ESDHPublicKeySpec

public ESDHPublicKeySpec(java.math.BigInteger y,
                         java.math.BigInteger p,
                         java.math.BigInteger g,
                         java.math.BigInteger q,
                         java.math.BigInteger j,
                         byte[] seed,
                         int pgenCounter)

Creates a Diffie-Hellman public key specification based on given public value y, prime modulus p, base generator g, prime factor q, subgroup factor j and the seed and counter used in the system parameter generation process.

Parameters:

y - the public value

p - the prime modulus

g - the base generator

q - the prime factor

j - the subgroup factor

seed - the the seed used in the system parameter generation process

pgenCounter - the counter used in the system parameter generation process

Method Detail

getL

public long getL()

This method overrides the method of the super class and always returns 0 since we don't use parameter L in ESDH.

Returns:

0 is returned

getQ

public java.math.BigInteger getQ()

Returns the prime factor q.

Returns:

the prime factor q

getJ

public java.math.BigInteger getJ()

Returns the subgroup factor j.

Returns:

the subgroup factor j

getSeed

public byte[] getSeed()

Returns the seed used in the system parameter generation process.

Returns:

the seed used in the system parameter generation process

getPGenCounter

public int getPGenCounter()

Returns the counter used in the system parameter generation process.

Returns:

the counter used in the system parameter generation process