Class DHParameterSpec

java.lang.Object

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:

Constructor Summary

Constructor	Description
`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

Modifier and Type	Method	Description
`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 declared in class Object

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

Modifier and Type	Method	Description
`protected Object`	`clone()`	Creates and returns a copy of this object.
`boolean`	`equals(Object obj)`	Indicates whether some other object is "equal to" this one.
`protected void`	`finalize()`	Deprecated, for removal: This API element is subject to removal in a future version. Finalization is deprecated and subject to removal in a future release.
`final Class<?>`	`getClass()`	Returns the runtime class of this `Object`.
`int`	`hashCode()`	Returns a hash code value for this object.
`final void`	`notify()`	Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()`	Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()`	Returns a string representation of the object.
`final void`	`wait()`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
`final void`	`wait(long timeoutMillis)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis, int nanos)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

Constructor Details

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 Details

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

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