Class DHParameterSpec
- java.lang.Object
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- javax.crypto.spec.DHParameterSpec
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- All Implemented Interfaces:
- AlgorithmParameterSpec
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 prime
p, a baseg, 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:
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KeyAgreement
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Constructor Summary
Constructors Constructor and Description DHParameterSpec(BigInteger p, BigInteger g)Constructs a parameter set for Diffie-Hellman, using a prime moduluspand 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).
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method and Description BigIntegergetG()Returns the base generatorg.intgetL()Returns the size in bits,l, of the random exponent (private value).BigIntegergetP()Returns the prime modulusp.
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Constructor Detail
DHParameterSpec
public DHParameterSpec(BigInteger p, BigInteger g)
Constructs a parameter set for Diffie-Hellman, using a prime moduluspand a base generatorg.- Parameters:
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p- the prime modulus -
g- the base generator
DHParameterSpec
public 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).- Parameters:
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p- the prime modulus -
g- the base generator -
l- the size in bits of the random exponent (private value)
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Method Detail
getP
public BigInteger getP()
Returns the prime modulusp.- Returns:
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the prime modulus
p
getG
public BigInteger getG()
Returns the base generatorg.- Returns:
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the base generator
g
getL
public int getL()
Returns the size in bits,l, of the random exponent (private value).- Returns:
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the size in bits,
l, of the random exponent (private value), or 0 if this size has not been set
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