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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 with the Diffie-Hellman
* algorithm, as specified in PKCS #3: <i>Diffie-Hellman Key-Agreement
* Standard</i>.
* <p>
* A central authority generates parameters and gives them to the two
* entities seeking to generate a secret key. The parameters are a prime
* <code>p</code>, a base <code>g</code>, and optionally the length
* in bits of the private value, <code>l</code>.
* <p>
* 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.
*
* @see javax.crypto.KeyAgreement
*/
public class DHParameterSpec
implements AlgorithmParameterSpec
{
private BigInteger p;
private BigInteger g;
private int l;
/**
* Constructs a parameter set for Diffie-Hellman, using a prime modulus
* <code>p</code> and a base generator <code>g</code>.
*
* @param p the prime modulus
* @param g the base generator
*/
public DHParameterSpec(
BigInteger p,
BigInteger g)
{
this.p = p;
this.g = g;
}
/**
* Constructs a parameter set for Diffie-Hellman, using a prime modulus
* <code>p</code>, a base generator <code>g</code>, and the size in bits,
* <code>l</code>, of the random exponent (private value).
*
* @param p the prime modulus
* @param g the base generator
* @param l the size in bits of the random exponent (private value)
*/
public DHParameterSpec(
BigInteger p,
BigInteger g,
int l)
{
this.p = p;
this.g = g;
this.l = l;
}
/**
* Returns the prime modulus <code>p</code>.
*
* @return the prime modulus <code>p</code>
*/
public BigInteger getP()
{
return p;
}
/**
* Returns the base generator <code>g</code>.
*
* @return the base generator <code>g</code>
*/
public BigInteger getG()
{
return g;
}
/**
* Returns the size in bits, <code>l</code>, of the random exponent
* (private value).
*
* @return the size in bits, <code>l</code>, of the random exponent
* (private value), or 0 if this size has not been set
*/
public int getL()
{
return l;
}
}
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