This class defines the Service Provider Interface (SPI)
for the SecureRandom
class.
All the abstract methods in this class must be implemented by each
service provider who wishes to supply the implementation
of a cryptographically strong pseudo-random number generator.
See Also
Public Constructor Summary
Protected Method Summary
abstract byte[] |
engineGenerateSeed(int numBytes)
Returns the given number of seed bytes.
|
abstract void |
engineNextBytes(byte[] bytes)
Generates a user-specified number of random bytes.
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abstract void |
engineSetSeed(byte[] seed)
Reseeds this random object.
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Inherited Method Summary
Public Constructors
public SecureRandomSpi ()
Protected Methods
protected abstract byte[] engineGenerateSeed (int numBytes)
Returns the given number of seed bytes. This call may be used to seed other random number generators.
Parameters
numBytes | the number of seed bytes to generate. |
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Returns
- the seed bytes.
protected abstract void engineNextBytes (byte[] bytes)
Generates a user-specified number of random bytes.
If a call to engineSetSeed
had not occurred previously,
the first call to this method forces this SecureRandom implementation
to seed itself. This self-seeding will not occur if
engineSetSeed
was previously called.
Parameters
bytes | the array to be filled in with random bytes. |
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protected abstract void engineSetSeed (byte[] seed)
Reseeds this random object. The given seed supplements, rather than replaces, the existing seed. Thus, repeated calls are guaranteed never to reduce randomness.
Parameters
seed | the seed. |
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