SecureRandomSpi (Java Platform SE 8 ) (original) (raw)

• java.lang.Object

• • java.security.SecureRandomSpi

• All Implemented Interfaces:
  Serializable

public abstract class SecureRandomSpi
extends Object
implements Serializable
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.
Since:
1.2
See Also:
SecureRandom, Serialized Form

• • Constructor Summary

  Constructors

  Constructor	Description
  SecureRandomSpi()

  • Method Summary

  All Methods Instance Methods Abstract Methods

  Modifier and Type	Method	Description
  protected abstract byte[]	engineGenerateSeed(int numBytes)	Returns the given number of seed bytes.
  protected abstract void	engineNextBytes(byte[] bytes)	Generates a user-specified number of random bytes.
  protected abstract void	engineSetSeed(byte[] seed)	Reseeds this random object.

     * ### Methods inherited from class java.lang.[Object](../../java/lang/Object.html "class in java.lang")  
     `[clone](../../java/lang/Object.html#clone--), [equals](../../java/lang/Object.html#equals-java.lang.Object-), [finalize](../../java/lang/Object.html#finalize--), [getClass](../../java/lang/Object.html#getClass--), [hashCode](../../java/lang/Object.html#hashCode--), [notify](../../java/lang/Object.html#notify--), [notifyAll](../../java/lang/Object.html#notifyAll--), [toString](../../java/lang/Object.html#toString--), [wait](../../java/lang/Object.html#wait--), [wait](../../java/lang/Object.html#wait-long-), [wait](../../java/lang/Object.html#wait-long-int-)`

• • Constructor Detail

     * #### SecureRandomSpi  
     public SecureRandomSpi()  

  • 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:  
    `seed` \- the seed.  
    * #### engineNextBytes  
    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.  
    * #### 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:  
    `numBytes` \- the number of seed bytes to generate.  
    Returns:  
    the seed bytes.

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