compact1, compact2, compact3
java.security
Class SecureRandomSpi
- java.lang.Object
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- java.security.SecureRandomSpi
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- All Implemented Interfaces:
- Serializable
public abstract class SecureRandomSpi extends Object implements Serializable
This class defines the Service Provider Interface (SPI) for theSecureRandomclass. 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.- Since:
- 1.2
- See Also:
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SecureRandom, Serialized Form
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Constructor Summary
Constructors Constructor and Description SecureRandomSpi()
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method and Description protected abstract byte[]engineGenerateSeed(int numBytes)Returns the given number of seed bytes.protected abstract voidengineNextBytes(byte[] bytes)Generates a user-specified number of random bytes.protected abstract voidengineSetSeed(byte[] seed)Reseeds this random object.
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Method Detail
engineSetSeed
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:
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seed- the seed.
engineNextBytes
protected abstract void engineNextBytes(byte[] bytes)
Generates a user-specified number of random bytes.If a call to
engineSetSeedhad not occurred previously, the first call to this method forces this SecureRandom implementation to seed itself. This self-seeding will not occur ifengineSetSeedwas previously called.- Parameters:
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bytes- the array to be filled in with random bytes.
engineGenerateSeed
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:
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numBytes- the number of seed bytes to generate. - Returns:
- the seed bytes.
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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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