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package javax.crypto.spec;
import java.math.BigInteger;
import java.security.spec.AlgorithmParameterSpec;
/**
* This class specifies the set of parameters used for generating
* Diffie-Hellman (system) parameters for use in Diffie-Hellman key
* agreement. This is typically done by a central
* authority.
*
* <p> The central authority, after computing the parameters, must send this
* information to the parties looking to agree on a secret key.
*
* @author Jan Luehe
*
* @see DHParameterSpec
* @since 1.4
*/
public class DHGenParameterSpec implements AlgorithmParameterSpec {
// The size in bits of the prime modulus
private int primeSize;
// The size in bits of the random exponent (private value)
private int exponentSize;
/**
* Constructs a parameter set for the generation of Diffie-Hellman
* (system) parameters. The constructed parameter set can be used to
* initialize an
* {@link java.security.AlgorithmParameterGenerator AlgorithmParameterGenerator}
* object for the generation of Diffie-Hellman parameters.
*
* @param primeSize the size (in bits) of the prime modulus.
* @param exponentSize the size (in bits) of the random exponent.
*/
public DHGenParameterSpec(int primeSize, int exponentSize) {
this.primeSize = primeSize;
this.exponentSize = exponentSize;
}
/**
* Returns the size in bits of the prime modulus.
*
* @return the size in bits of the prime modulus
*/
public int getPrimeSize() {
return this.primeSize;
}
/**
* Returns the size in bits of the random exponent (private value).
*
* @return the size in bits of the random exponent (private value)
*/
public int getExponentSize() {
return this.exponentSize;
}
}