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## java.security
Class SecureRandomSpi

    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
`SecureRandomSpi()`

Method Summary
`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.

  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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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.