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SecureRandomSpi

public abstract class SecureRandomSpi
extends Object implements Serializable

java.lang.Object
   ↳ java.security.SecureRandomSpi


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:

Summary

Public constructors

SecureRandomSpi()

Protected methods

abstract byte[] engineGenerateSeed(int numBytes)

Returns the given number of seed bytes.

abstract void engineNextBytes(byte[] bytes)

Generates a user-specified number of random bytes.

abstract void engineSetSeed(byte[] seed)

Reseeds this random object.

Inherited methods

From class java.lang.Object

Public constructors

SecureRandomSpi

Added in API level 1
SecureRandomSpi ()

Protected methods

engineGenerateSeed

Added in API level 1
byte[] engineGenerateSeed (int numBytes)

Returns the given number of seed bytes. This call may be used to seed other random number generators.

Parameters
numBytes int: the number of seed bytes to generate.
Returns
byte[] the seed bytes.

engineNextBytes

Added in API level 1
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 byte: the array to be filled in with random bytes.

engineSetSeed

Added in API level 1
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 byte: the seed.
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