javax.crypto.spec
Class DHParameterSpec
java.lang.Object
|
+--javax.crypto.spec.DHParameterSpec
- public class DHParameterSpec
- extends java.lang.Object
- implements java.security.spec.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.
- See Also:
KeyAgreement
,
AlgorithmParameters
,
AlgorithmParameterSpec
Field Summary |
static java.lang.String |
ident
|
Constructor Summary |
DHParameterSpec(java.math.BigInteger p,
java.math.BigInteger g)
Specifies the Diffie-Hellman parameters, using a prime modulus p
and a base generator g. |
DHParameterSpec(java.math.BigInteger p,
java.math.BigInteger g,
int l)
Specifies the Diffie-Hellman parameters, using a prime modulus p, a
base generator g, and the size in bits, l, of the random exponent
(private value). |
Method Summary |
java.math.BigInteger |
getG()
Returns the base generator g. |
int |
getL()
Returns the size in bits, l, of the random exponent (private value). |
java.math.BigInteger |
getP()
Returns the prime modulus p. |
Methods inherited from class java.lang.Object |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
ident
public static final java.lang.String ident
DHParameterSpec
public DHParameterSpec(java.math.BigInteger p,
java.math.BigInteger g)
- Specifies the Diffie-Hellman parameters, using a prime modulus p
and a base generator g.
- Parameters:
p
- - the prime modulusg
- - the base generator
DHParameterSpec
public DHParameterSpec(java.math.BigInteger p,
java.math.BigInteger g,
int l)
- Specifies the Diffie-Hellman parameters, 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 modulusg
- the base generatorl
- the size in bits of the random exponent (private value)
getP
public java.math.BigInteger getP()
- Returns the prime modulus p.
- Returns:
- the prime modulus p
getG
public java.math.BigInteger 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