Package com.amazonaws.encryptionsdk.caching

Class LocalCryptoMaterialsCache

java.lang.Object

com.amazonaws.encryptionsdk.caching.LocalCryptoMaterialsCache

All Implemented Interfaces:

CryptoMaterialsCache

public class LocalCryptoMaterialsCache
extends Object
implements CryptoMaterialsCache

A simple implementation of the CryptoMaterialsCache using a basic LRU cache.

Example usage:

 LocalCryptoMaterialsCache cache = new LocalCryptoMaterialsCache(500);

 CachingCryptoMaterialsManager materialsManager = CachingCryptoMaterialsManager.builder()
      .setMaxAge(5, TimeUnit.MINUTES)
      .setCache(cache)
      .withMasterKeyProvider(myMasterKeyProvider)
      .build();

 byte[] data = new AwsCrypto().encryptData(materialsManager, plaintext).getResult();
 

Nested Class Summary

Nested classes/interfaces inherited from interface com.amazonaws.encryptionsdk.caching.CryptoMaterialsCache

CryptoMaterialsCache.CacheHint, CryptoMaterialsCache.DecryptCacheEntry, CryptoMaterialsCache.EncryptCacheEntry, CryptoMaterialsCache.UsageStats

Constructor Summary

Constructors

Constructor	Description
LocalCryptoMaterialsCache(int capacity)

Method Summary

Modifier and Type	Method	Description
CryptoMaterialsCache.DecryptCacheEntry	getEntryForDecrypt(byte[] cacheId)	Searches for an entry in the encrypt cache matching a particular cache identifier, and returns one if found.
CryptoMaterialsCache.EncryptCacheEntry	getEntryForEncrypt(byte[] cacheId, CryptoMaterialsCache.UsageStats usageIncrement)	Searches for an entry in the encrypt cache matching a particular cache identifier, and returns one if found.
void	putEntryForDecrypt(byte[] cacheId, DecryptionMaterials decryptionMaterials, CryptoMaterialsCache.CacheHint hint)	Adds a new entry to the decrypt cache.
CryptoMaterialsCache.EncryptCacheEntry	putEntryForEncrypt(byte[] cacheId, EncryptionMaterials encryptionMaterials, CryptoMaterialsCache.CacheHint hint, CryptoMaterialsCache.UsageStats initialUsage)	Attempts to add a new entry to the encrypt cache to be returned on subsequent CryptoMaterialsCache.getEntryForEncrypt(byte[], UsageStats) calls.

Methods inherited from class java.lang.Object

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

Constructor Details

LocalCryptoMaterialsCache

public LocalCryptoMaterialsCache(int capacity)

Method Details

getEntryForEncrypt

public CryptoMaterialsCache.EncryptCacheEntry getEntryForEncrypt(byte[] cacheId,
 CryptoMaterialsCache.UsageStats usageIncrement)

Description copied from interface: CryptoMaterialsCache

Searches for an entry in the encrypt cache matching a particular cache identifier, and returns one if found.

Specified by:

getEntryForEncrypt in interface CryptoMaterialsCache

Parameters:

cacheId - The identifier for the item in the cache

usageIncrement - The amount of usage to atomically add to the returned entry. This usage increment must be reflected in the getUsageStats() method on the returned cache entry.

Returns:

The entry, or null if not found or an error occurred

putEntryForEncrypt

public CryptoMaterialsCache.EncryptCacheEntry putEntryForEncrypt(byte[] cacheId,
 EncryptionMaterials encryptionMaterials,
 CryptoMaterialsCache.CacheHint hint,
 CryptoMaterialsCache.UsageStats initialUsage)

Description copied from interface: CryptoMaterialsCache

Attempts to add a new entry to the encrypt cache to be returned on subsequent CryptoMaterialsCache.getEntryForEncrypt(byte[], UsageStats) calls.

In the event that an error occurs when adding the entry to the cache, this function shall still return a EncryptCacheEntry instance, which shall act as if the cache entry was immediately evicted and/or invalidated.

Specified by:

putEntryForEncrypt in interface CryptoMaterialsCache

Parameters:

cacheId - The identifier for the item in the cache

encryptionMaterials - The EncryptionMaterials to associate with this new entry

initialUsage - The initial usage stats for the cache entry

Returns:

A new, locked EncryptCacheEntry instance containing the given encryptionMaterials

getEntryForDecrypt

public CryptoMaterialsCache.DecryptCacheEntry getEntryForDecrypt(byte[] cacheId)

Description copied from interface: CryptoMaterialsCache

Searches for an entry in the encrypt cache matching a particular cache identifier, and returns one if found.

In the event of an error accessing the cache, this function will return null.

Specified by:

getEntryForDecrypt in interface CryptoMaterialsCache

Parameters:

cacheId - The identifier for the item in the cache

Returns:

The cached decryption result, or null if none was found or an error occurred.

putEntryForDecrypt

public void putEntryForDecrypt(byte[] cacheId,
 DecryptionMaterials decryptionMaterials,
 CryptoMaterialsCache.CacheHint hint)

Description copied from interface: CryptoMaterialsCache

Adds a new entry to the decrypt cache. In the event of an error, this function will return silently without propagating the exception.

If an entry already exists for this cache ID, the cache may either overwrite the entry in its entirety, or update the creation timestamp for the existing entry, at its option.

Specified by:

putEntryForDecrypt in interface CryptoMaterialsCache

Parameters:

cacheId - The identifier for the item in the cache

decryptionMaterials - The DecryptionMaterials to associate with the new entry.