Class KeyPairCache

java.lang.Object

org.globus.gsi.gssapi.KeyPairCache

public class KeyPairCache
extends Object

Simple cache for key pairs. The cache is used to avoid excessive CPU consumption from key pair generation. In particular for purposes of delegation, reusing a key pair is safe.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static class	KeyPairCache.KeyPairCacheEntry

Field Summary

Fields

Modifier and Type	Field	Description
private final String	algorithm
static final String	DEFAULT_ALGORITHM
static final String	DEFAULT_PROVIDER
private final Map	entries	Hash table of cache entries.
private static KeyPairCache	keyPairCache
private final long	lifetime
private static org.apache.commons.logging.Log	logger
private final String	provider

Constructor Summary

Constructors

Modifier	Constructor	Description
private	KeyPairCache(String algorithm, String provider, long lifetime)	Creates a KeyPairCache object for the specified algorithm, as supplied from the specified provider.

Method Summary

Modifier and Type	Method	Description
KeyPair	getKeyPair(int bits)	Returns a key pair of size bits.
static KeyPairCache	getKeyPairCache()
static KeyPairCache	getKeyPairCache(String algorithm, String provider, long lifetime)

Methods inherited from class Object

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

Field Details

logger

private static org.apache.commons.logging.Log logger

DEFAULT_ALGORITHM

public static final String DEFAULT_ALGORITHM

See Also:

• Constant Field Values

DEFAULT_PROVIDER

public static final String DEFAULT_PROVIDER

See Also:

• Constant Field Values

algorithm

private final String algorithm

provider

private final String provider

lifetime

private final long lifetime

keyPairCache

private static KeyPairCache keyPairCache

entries

private final Map entries

Hash table of cache entries. The use of Hashtable is significant, since we rely on access to the table being synchronized.

Constructor Details

KeyPairCache

private KeyPairCache(String algorithm,
 String provider,
 long lifetime)

Creates a KeyPairCache object for the specified algorithm, as supplied from the specified provider.

Parameters:

algorithm - the standard string name of the algorithm. See Appendix A in the Java Cryptography Architecture API Specification & Reference for information about standard algorithm names.

provider - the string name of the provider.

lifetime - the lifetime of the cache in milliseconds.

Method Details

getKeyPairCache

public static KeyPairCache getKeyPairCache()

getKeyPairCache

public static KeyPairCache getKeyPairCache(String algorithm,
 String provider,
 long lifetime)

getKeyPair

public KeyPair getKeyPair(int bits)
                   throws NoSuchAlgorithmException,
NoSuchProviderException

Returns a key pair of size bits. The same key pair may be returned several times within a period of the cache lifetime. If lifetime was set to zero or less than zero, no keys are cached.

Parameters:

bits - the keysize. This is an algorithm-specific metric, such as modulus length, specified in number of bits.

Throws:

NoSuchAlgorithmException - if the algorithm is not available in the environment.

NoSuchProviderException - if the provider is not available in the environment.