Interface DSAKeyPairGenerator
The initialize
methods may each be called any number
of times. If no initialize
method is called on a
DSAKeyPairGenerator, each provider that implements this interface
should supply (and document) a default initialization. Note that
defaults may vary across different providers. Additionally, the default
value for a provider may change in a future version. Therefore, it is
recommended to explicitly initialize the DSAKeyPairGenerator instead
of relying on provider-specific defaults.
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. - Check if the returned key pair generator is an instance of
DSAKeyPairGenerator before 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 of the KeyPairGenerator class.
Note: it is not always necessary to 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 the initialize
method
in the KeyPairGenerator
interface is all that is needed when you accept defaults for algorithm-specific
parameters.
Note: Some earlier implementations of this interface may not support larger values of DSA parameters such as 3072-bit.
- Since:
- 1.1
- See Also:
-
Method Summary
Modifier and TypeMethodDescriptionvoid
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.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.
-
Method Details
-
initialize
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, null, or unsupported.
-
initialize
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.- Parameters:
modlen
- the modulus length in bits. Valid values are any multiple of 64 between 512 and 1024, inclusive, 2048, and 3072.genParams
- whether to generate new parameters for the modulus length requested.random
- the random bit source to use to generate key bits; can be null.- Throws:
InvalidParameterException
- ifmodlen
is invalid, or unsupported, or ifgenParams
is false and there are no precomputed parameters for the requested modulus length.
-