public abstract class KeyGeneratorSpi extends Object
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.
Constructor | Description |
---|---|
KeyGeneratorSpi() |
Constructor for subclasses to call. |
Modifier and Type | Method | Description |
---|---|---|
protected abstract SecretKey |
engineGenerateKey() |
Generates a secret key. |
protected abstract void |
engineInit |
Initializes this key generator for a certain keysize, using the given source of randomness. |
protected abstract void |
engineInit |
Initializes the key generator. |
protected abstract void |
engineInit |
Initializes the key generator with the specified parameter set and a user-provided source of randomness. |
public KeyGeneratorSpi()
protected abstract void engineInit(SecureRandom random)
random
- the source of randomness for this generatorprotected abstract void engineInit(AlgorithmParameterSpec params, SecureRandom random) throws InvalidAlgorithmParameterException
params
- the key generation parametersrandom
- the source of randomness for this key generatorInvalidAlgorithmParameterException
- if params
is inappropriate for this key generatorprotected abstract void engineInit(int keysize, SecureRandom random)
keysize
- the keysize. This is an algorithm-specific metric, specified in number of bits.random
- the source of randomness for this key generatorInvalidParameterException
- if the keysize is wrong or not supported.protected abstract SecretKey engineGenerateKey()
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Documentation extracted from Debian's OpenJDK Development Kit package.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/javax/crypto/KeyGeneratorSpi.html