DHParameterSpec (Java SE 11 & JDK 11 ) (original) (raw)

• java.lang.Object

• • javax.crypto.spec.DHParameterSpec

• All Implemented Interfaces:
  [AlgorithmParameterSpec](../../../java/security/spec/AlgorithmParameterSpec.html "interface in java.security.spec")

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 primep, 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

  Constructors

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

  • Method Summary

  All Methods Instance Methods Concrete Methods

  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 java.lang.[Object](../../../java/lang/Object.html "class in java.lang")  
     `[clone](../../../java/lang/Object.html#clone%28%29), [equals](../../../java/lang/Object.html#equals%28java.lang.Object%29), [finalize](../../../java/lang/Object.html#finalize%28%29), [getClass](../../../java/lang/Object.html#getClass%28%29), [hashCode](../../../java/lang/Object.html#hashCode%28%29), [notify](../../../java/lang/Object.html#notify%28%29), [notifyAll](../../../java/lang/Object.html#notifyAll%28%29), [toString](../../../java/lang/Object.html#toString%28%29), [wait](../../../java/lang/Object.html#wait%28%29), [wait](../../../java/lang/Object.html#wait%28long%29), [wait](../../../java/lang/Object.html#wait%28long,int%29)`

• • Constructor Detail

     * #### DHParameterSpec  
     public DHParameterSpec​([BigInteger](../../../java/math/BigInteger.html "class in java.math") p,  
                            [BigInteger](../../../java/math/BigInteger.html "class in java.math") 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](../../../java/math/BigInteger.html "class in java.math") p,  
                            [BigInteger](../../../java/math/BigInteger.html "class in java.math") 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](../../../java/math/BigInteger.html "class in java.math") getP()  
    Returns the prime modulus `p`.  
    Returns:  
    the prime modulus `p`  
    * #### getG  
    public [BigInteger](../../../java/math/BigInteger.html "class in java.math") 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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