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package java.security;

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. 
See Also:
SecureRandom
Since:
1.2/**
 * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
 * for the {@code 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.
 *
 *
 * @see SecureRandom
 * @since 1.2
 */

public abstract class SecureRandomSpi implements java.io.Serializable {

    private static final long serialVersionUID = -2991854161009191830L;

    
Reseeds this random object. The given seed supplements, rather than
replaces, the existing seed. Thus, repeated calls are guaranteed
never to reduce randomness.
Params:
seed – the seed./**
     * Reseeds this random object. The given seed supplements, rather than
     * replaces, the existing seed. Thus, repeated calls are guaranteed
     * never to reduce randomness.
     *
     * @param seed the seed.
     */
    protected abstract void engineSetSeed(byte[] seed);

    
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. 
Params:
bytes – the array to be filled in with random bytes./**
     * Generates a user-specified number of random bytes.
     *
     * <p> If a call to {@code 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
     * {@code engineSetSeed} was previously called.
     *
     * @param bytes the array to be filled in with random bytes.
     */
    protected abstract void engineNextBytes(byte[] bytes);

    
Returns the given number of seed bytes.  This call may be used to
seed other random number generators.
Params:
numBytes – the number of seed bytes to generate.
Returns:
the seed bytes./**
     * Returns the given number of seed bytes.  This call may be used to
     * seed other random number generators.
     *
     * @param numBytes the number of seed bytes to generate.
     *
     * @return the seed bytes.
     */
     protected abstract byte[] engineGenerateSeed(int numBytes);
}