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public interface DSAKeyPairGenerator
An interface to an object capable of generating DSA key pairs.The
initialize
methods may each be called any number of times. If noinitialize
method is called on a DSAKeyPairGenerator, the default is to generate 1024-bit keys, using precomputed p, q and g parameters and an instance of SecureRandom as the random bit source.Users wishing to indicate DSA-specific parameters, and to generate a key pair suitable for use with the DSA algorithm typically
- Get a key pair generator for the DSA algorithm by calling the
KeyPairGenerator
getInstance
method with "DSA" as its argument. - Initialize the generator by casting the result to a DSAKeyPairGenerator
and calling one of the
initialize
methods from this DSAKeyPairGenerator interface. - Generate a key pair by calling the
generateKeyPair
method from the KeyPairGenerator class.
Note: it is not always necessary to do do algorithm-specific initialization for a DSA key pair generator. That is, it is not always necessary to call an
initialize
method in this interface. Algorithm-independent initialization using theinitialize
method in the KeyPairGenerator interface is all that is needed when you accept defaults for algorithm-specific parameters.- See Also:
KeyPairGenerator
- Get a key pair generator for the DSA algorithm by calling the
KeyPairGenerator
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Method Summary
Methods Modifier and Type Method and Description void
initialize(DSAParams params, SecureRandom random)
Initializes the key pair generator using the DSA family parameters (p,q and g) and an optional SecureRandom bit source.void
initialize(int modlen, boolean genParams, SecureRandom random)
Initializes the key pair generator for a given modulus length (instead of parameters), and an optional SecureRandom bit source.
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Method Detail
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initialize
void initialize(DSAParams params, SecureRandom random) throws InvalidParameterException
Initializes the key pair generator using the DSA family parameters (p,q and g) and an optional SecureRandom bit source. If a SecureRandom bit source is needed but not supplied, i.e. null, a default SecureRandom instance will be used.- Parameters:
params
- the parameters to use to generate the keys.random
- the random bit source to use to generate key bits; can be null.- Throws:
InvalidParameterException
- if theparams
value is invalid or null.
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initialize
void initialize(int modlen, boolean genParams, SecureRandom random) throws InvalidParameterException
Initializes the key pair generator for a given modulus length (instead of parameters), and an optional SecureRandom bit source. If a SecureRandom bit source is needed but not supplied, i.e. null, a default SecureRandom instance will be used.If
genParams
is true, this method generates new p, q and g parameters. If it is false, the method uses precomputed parameters for the modulus length requested. If there are no precomputed parameters for that modulus length, an exception will be thrown. It is guaranteed that there will always be default parameters for modulus lengths of 512 and 1024 bits.- Parameters:
modlen
- the modulus length in bits. Valid values are any multiple of 8 between 512 and 1024, inclusive.random
- the random bit source to use to generate key bits; can be null.genParams
- whether or not to generate new parameters for the modulus length requested.- Throws:
InvalidParameterException
- ifmodlen
is not between 512 and 1024, or ifgenParams
is false and there are no precomputed parameters for the requested modulus length.
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Document created the 11/06/2005, last modified the 04/03/2020
Source of the printed document:https://www.gaudry.be/en/java-api-rf-java/security/interfaces/dsakeypairgenerator.html/.html
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