JavaTM 2 Platform
Standard Ed. 5.0

javax.crypto.spec
Class DHParameterSpec

java.lang.Object
  extended by javax.crypto.spec.DHParameterSpec
All Implemented Interfaces:
AlgorithmParameterSpec

public class DHParameterSpec
extends Object
implements AlgorithmParameterSpec

This class specifies the set of parameters used with the Diffie-Hellman algorithm, as specified in PKCS #3: Diffie-Hellman Key-Agreement Standard.

A central authority generates parameters and gives them to the two entities seeking to generate a secret key. The parameters are a prime p, a base g, and optionally the length in bits of the private value, l.

It is possible that more than one instance of parameters may be generated by a given central authority, and that there may be more than one central authority. Indeed, each individual may be its own central authority, with different entities having different parameters.

Note that this class does not perform any validation on specified parameters. Thus, the specified values are returned directly even if they are null.

Since:
1.4
See Also:
KeyAgreement

Constructor Summary
DHParameterSpec(BigInteger p, BigInteger g)
          Constructs a parameter set for Diffie-Hellman, using a prime modulus p and a base generator g.
DHParameterSpec(BigInteger p, BigInteger g, int l)
          Constructs a parameter set for Diffie-Hellman, using a prime modulus p, a base generator g, and the size in bits, l, of the random exponent (private value).
 
Method Summary
 BigInteger getG()
          Returns the base generator g.
 int getL()
          Returns the size in bits, l, of the random exponent (private value).
 BigInteger getP()
          Returns the prime modulus p.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DHParameterSpec

public DHParameterSpec(BigInteger p,
                       BigInteger g)
Constructs a parameter set for Diffie-Hellman, using a prime modulus p and a base generator g.

Parameters:
p - the prime modulus
g - the base generator

DHParameterSpec

public DHParameterSpec(BigInteger p,
                       BigInteger g,
                       int l)
Constructs a parameter set for Diffie-Hellman, using a prime modulus p, a base generator g, and the size in bits, l, of the random exponent (private value).

Parameters:
p - the prime modulus
g - the base generator
l - the size in bits of the random exponent (private value)
Method Detail

getP

public BigInteger getP()
Returns the prime modulus p.

Returns:
the prime modulus p

getG

public BigInteger getG()
Returns the base generator g.

Returns:
the base generator g

getL

public int getL()
Returns the size in bits, l, of the random exponent (private value).

Returns:
the size in bits, l, of the random exponent (private value), or 0 if this size has not been set

JavaTM 2 Platform
Standard Ed. 5.0

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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