java.lang.Object
javax.crypto.KeyGeneratorSpi
public abstract class KeyGeneratorSpi extends Object
This class defines the Service Provider Interface (SPI)
for the
KeyGenerator
class.
All the abstract methods in this class must be implemented by each
cryptographic service provider who wishes to supply the implementation
of a key generator for a particular algorithm.
In case the client does not explicitly initialize the KeyGenerator
(via a call to an init
method), each provider must
supply (and document) a default initialization.
See the Keysize Restriction sections of the
JDK Providers
document for information on the KeyGenerator defaults used by
JDK providers.
However, 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
KeyGenerator instead of relying on provider-specific defaults.
- Since:
- 1.4
- See Also:
SecretKey
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionprotected abstract SecretKey
Generates a secret key.protected abstract void
engineInit(int keysize, SecureRandom random)
Initializes this key generator for a certain keysize, using the given source of randomness.protected abstract void
engineInit(SecureRandom random)
Initializes the key generator.protected abstract void
engineInit(AlgorithmParameterSpec params, SecureRandom random)
Initializes the key generator with the specified parameter set and a user-provided source of randomness.
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Constructor Details
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KeyGeneratorSpi
public KeyGeneratorSpi()Constructor for subclasses to call.
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Method Details
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engineInit
Initializes the key generator.- Parameters:
random
- the source of randomness for this generator
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engineInit
protected abstract void engineInit(AlgorithmParameterSpec params, SecureRandom random) throws InvalidAlgorithmParameterExceptionInitializes the key generator with the specified parameter set and a user-provided source of randomness.- Parameters:
params
- the key generation parametersrandom
- the source of randomness for this key generator- Throws:
InvalidAlgorithmParameterException
- ifparams
is inappropriate for this key generator
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engineInit
Initializes this key generator for a certain keysize, using the given source of randomness.- Parameters:
keysize
- the keysize. This is an algorithm-specific metric, specified in number of bits.random
- the source of randomness for this key generator- Throws:
InvalidParameterException
- if the keysize is wrong or not supported.
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engineGenerateKey
Generates a secret key.- Returns:
- the new key
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