Package java.security

Class SecureRandomSpi

  • All Implemented Interfaces:
    java.io.Serializable
    public abstract class SecureRandomSpi
extends java.lang.Object
implements java.io.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

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • 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.