aws_encryption_sdk.caches

Common functions and structures for use in cryptographic materials caches.

New in version 1.3.0.

Functions

`build_decryption_materials_cache_key`(...)	Generates a cache key for a decrypt request.
`build_encryption_materials_cache_key`(...)	Generates a cache key for an encrypt request.

Classes

`CryptoMaterialsCacheEntry`(cache_key, value)	Value and metadata store for cryptographic materials cache entries.
`CryptoMaterialsCacheEntryHints`([lifetime])	Optional metadata to associate with cryptographic materials cache entries.

aws_encryption_sdk.caches.build_encryption_materials_cache_key(partition, request)

Generates a cache key for an encrypt request.

Parameters

partition (bytes) – Partition name for which to generate key
request (aws_encryption_sdk.materials_managers.EncryptionMaterialsRequest) – Request for which to generate key

Returns

cache key

Return type

bytes

aws_encryption_sdk.caches.build_decryption_materials_cache_key(partition, request)

Generates a cache key for a decrypt request.

Parameters

partition (bytes) – Partition name for which to generate key
request (aws_encryption_sdk.materials_managers.DecryptionMaterialsRequest) – Request for which to generate key

Returns

cache key

Return type

bytes

class aws_encryption_sdk.caches.CryptoMaterialsCacheEntryHints(lifetime=None)

Optional metadata to associate with cryptographic materials cache entries.

Parameters: lifetime (float) – Number of seconds to retain entry in cache (optional)

Method generated by attrs for class CryptoMaterialsCacheEntryHints.

class aws_encryption_sdk.caches.CryptoMaterialsCacheEntry(cache_key, value, hints=_Nothing.NOTHING)

Value and metadata store for cryptographic materials cache entries.

Parameters

cache_key (bytes) – Identifier for entries in cache
value – Value to store in cache entry
hints (aws_encryption_sdk.caches.CryptoMaterialsCacheEntryHints) – Metadata to associate with entry (optional)

Method generated by attrs for class CryptoMaterialsCacheEntry.

property age

Returns this entry’s current age in seconds.

is_too_old()

Determines if if this entry’s lifetime has passed.