程序包 java.security

类 SecureRandomSpi

java.lang.Object

java.security.SecureRandomSpi

所有已实现的接口:

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.

从以下版本开始:

1.2

另请参阅:

SecureRandom, 序列化表格

构造器概要

构造器

构造器	说明
SecureRandomSpi()

方法概要

限定符和类型	方法	说明
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.

从类继承的方法 java.lang.Object

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

构造器详细资料

SecureRandomSpi

public SecureRandomSpi()

方法详细资料

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.

参数:

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.

参数:

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.

参数:

numBytes - the number of seed bytes to generate.

返回:

the seed bytes.