com.atlassian.security.random
Class DefaultSecureRandomService

java.lang.Object
  com.atlassian.security.random.DefaultSecureRandomService

All Implemented Interfaces:

SecureRandomService

public final class DefaultSecureRandomService
extends Object
implements SecureRandomService

Implementation of the SecureRandomService which delegates to a single, shared instance of SecureRandom.

Potential improvements include:

• Periodic Re-seeding: currently we are not sure if this is a requirement, so it has not been implemented.
• Object Pooling: as SecureRandoms block on calls to produce random data, we may improve throughput by pooling a collection of SecureRandoms. Contention is not yet been proved to be a problem, so it has not been implemented.

The current implementation is guaranteed to be thread-safe as it delegates calls to the underlying SecureRandom instance.

Method Summary

static SecureRandomService	getInstance()
boolean	nextBoolean() Returns the next pseudorandom boolean.
void	nextBytes(byte[] bytes) Generates a user-specified number of random bytes.
double	nextDouble() Returns the next pseudorandom double.
float	nextFloat() Returns the next pseudorandom float.
int	nextInt() Returns the next pseudorandom int.
int	nextInt(int n) Returns a pseudorandom, int value between 0 (inclusive) and the specified value (exclusive).
long	nextLong() Returns the next pseudorandom long.

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static SecureRandomService getInstance()

Returns:

shared DefaultSecureRandomService instance which delegates to a single, shared instance of SecureRandom.

nextBytes

public void nextBytes(byte[] bytes)

Description copied from interface: SecureRandomService

Generates a user-specified number of random bytes.

Specified by:

nextBytes in interface SecureRandomService

Parameters:

bytes - the array to be filled in with random bytes.

See Also:

SecureRandom.nextBytes(byte[])

nextInt

public int nextInt()

Description copied from interface: SecureRandomService

Returns the next pseudorandom int.

Specified by:

nextInt in interface SecureRandomService

Returns:

the next pseudorandom int.

See Also:

Random.nextInt()

nextInt

public int nextInt(int n)

Description copied from interface: SecureRandomService

Returns a pseudorandom, int value between 0 (inclusive) and the specified value (exclusive).

Specified by:

nextInt in interface SecureRandomService

Parameters:

n - the bound on the random number to be returned. Must be positive.

Returns:

the next pseudorandom, int value between 0 (inclusive) and n (exclusive).

See Also:

Random.nextInt(int)

nextLong

public long nextLong()

Description copied from interface: SecureRandomService

Returns the next pseudorandom long.

Specified by:

nextLong in interface SecureRandomService

Returns:

the next pseudorandom long.

See Also:

Random.nextLong()

nextBoolean

public boolean nextBoolean()

Description copied from interface: SecureRandomService

Returns the next pseudorandom boolean.

Specified by:

nextBoolean in interface SecureRandomService

Returns:

the next pseudorandom boolean.

See Also:

Random.nextBoolean()

nextFloat

public float nextFloat()

Description copied from interface: SecureRandomService

Returns the next pseudorandom float.

Specified by:

nextFloat in interface SecureRandomService

Returns:

the next pseudorandom float.

See Also:

Random.nextFloat()

nextDouble

public double nextDouble()

Description copied from interface: SecureRandomService

Returns the next pseudorandom double.

Specified by:

nextDouble in interface SecureRandomService

Returns:

the next pseudorandom double.

See Also:

Random.nextDouble()