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Java Standard Edition (SE)

SecureRandomSpi


compact1, compact2, compact3
java.security

Class 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 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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