java.lang.Object
javax.crypto.spec.DHParameterSpec
- All Implemented Interfaces:
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
ConstructorDescriptionConstructs a parameter set for Diffie-Hellman, using a prime modulusp
and a base generatorg
.DHParameterSpec
(BigInteger p, BigInteger g, int l) Constructs a parameter set for Diffie-Hellman, using a prime modulusp
, a base generatorg
, and the size in bits,l
, of the random exponent (private value). -
Method Summary
-
Constructor Details
-
DHParameterSpec
Constructs a parameter set for Diffie-Hellman, using a prime modulusp
and a base generatorg
.- Parameters:
p
- the prime modulusg
- the base generator
-
DHParameterSpec
Constructs a parameter set for Diffie-Hellman, using a prime modulusp
, a base generatorg
, and the size in bits,l
, of the random exponent (private value).- Parameters:
p
- the prime modulusg
- the base generatorl
- the size in bits of the random exponent (private value)
-
-
Method Details
-
getP
Returns the prime modulusp
.- Returns:
- the prime modulus
p
-
getG
Returns the base generatorg
.- 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
-