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DHParameterSpec

public class DHParameterSpec
extends Object implements AlgorithmParameterSpec

java.lang.Object
   ↳ javax.crypto.spec.DHParameterSpec


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.

See also:

Summary

Public constructors

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).

Public methods

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.

Inherited methods

From class java.lang.Object

Public constructors

DHParameterSpec

Added in API level 1
DHParameterSpec (BigInteger p, 
                BigInteger g)

Constructs a parameter set for Diffie-Hellman, using a prime modulus p and a base generator g.

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

DHParameterSpec

Added in API level 1
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 BigInteger: the prime modulus
g BigInteger: the base generator
l int: the size in bits of the random exponent (private value)

Public methods

getG

Added in API level 1
BigInteger getG ()

Returns the base generator g.

Returns
BigInteger the base generator g

getL

Added in API level 1
int getL ()

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

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

getP

Added in API level 1
BigInteger getP ()

Returns the prime modulus p.

Returns
BigInteger the prime modulus p
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