public
abstract
class
KeyPairGeneratorSpi
extends Object
| java.lang.Object | |
| ↳ | java.security.KeyPairGeneratorSpi |
 Known Direct Subclasses
|
This class defines the Service Provider Interface (SPI)
for the KeyPairGenerator class, which is used to generate
pairs of public and private keys.
All the abstract methods in this class must be implemented by each cryptographic service provider who wishes to supply the implementation of a key pair generator for a particular algorithm.
In case the client does not explicitly initialize the KeyPairGenerator
(via a call to an initialize method), each provider must
supply (and document) a default initialization.
For example, the Sun provider uses a default modulus size (keysize)
of 1024 bits.
See also:
Public constructors | |
|---|---|
KeyPairGeneratorSpi()
|
|
Public methods | |
|---|---|
abstract
KeyPair
|
generateKeyPair()
Generates a key pair. |
void
|
initialize(AlgorithmParameterSpec params, SecureRandom random)
Initializes the key pair generator using the specified parameter set and user-provided source of randomness. |
abstract
void
|
initialize(int keysize, SecureRandom random)
Initializes the key pair generator for a certain keysize, using the default parameter set. |
Inherited methods | |
|---|---|
From
class
java.lang.Object
| |
KeyPair generateKeyPair ()
Generates a key pair. Unless an initialization method is called using a KeyPairGenerator interface, algorithm-specific defaults will be used. This will generate a new key pair every time it is called.
| Returns | |
|---|---|
KeyPair |
the newly generated KeyPair |
void initialize (AlgorithmParameterSpec params, SecureRandom random)
Initializes the key pair generator using the specified parameter set and user-provided source of randomness.
This concrete method has been added to this previously-defined abstract class. (For backwards compatibility, it cannot be abstract.) It may be overridden by a provider to initialize the key pair generator. Such an override is expected to throw an InvalidAlgorithmParameterException if a parameter is inappropriate for this key pair generator. If this method is not overridden, it always throws an UnsupportedOperationException.
| Parameters | |
|---|---|
params |
AlgorithmParameterSpec:
the parameter set used to generate the keys. |
random |
SecureRandom:
the source of randomness for this generator. |
| Throws | |
|---|---|
InvalidAlgorithmParameterException |
if the given parameters are inappropriate for this key pair generator. |
Developers
void initialize (int keysize,
SecureRandom random)
Initializes the key pair generator for a certain keysize, using the default parameter set.
| Parameters | |
|---|---|
keysize |
int:
the keysize. This is an
algorithm-specific metric, such as modulus length, specified in
number of bits. |
random |
SecureRandom:
the source of randomness for this generator. |
| Throws | |
|---|---|
InvalidParameterException |
if the keysize is not
supported by this KeyPairGeneratorSpi object.
|