public static class CryptixAESKeyCache.KeyCacheEntry
extends Object
implements Serializable

Container for AES round keys generated during key schedule expansion. This class holds all the pre-computed round keys required for AES encryption and decryption operations. The round keys are derived from the original AES key through the key schedule algorithm and stored in optimized integer arrays for fast access during cryptographic operations.

The entry contains:

• Encryption round keys (Ke) - expanded keys for each encryption round
• Decryption round keys (Kd) - inverse expanded keys for each decryption round

KeyCacheEntry objects are memory-intensive structures that benefit from caching to avoid repeated key schedule computations. Each entry contains (rounds + 1) × 4 integers for both encryption and decryption, where the number of rounds depends on the AES key size (10 rounds for 128-bit, 12 rounds for 192-bit, 14 rounds for 256-bit keys).

Thread Safety: This class is immutable after construction and safe for concurrent use by multiple threads.

Memory Usage: Each entry consumes approximately: 2 × (rounds + 1) × 4 × 4 bytes of heap memory. For AES-256 (14 rounds), this is about 448 bytes per entry. Obsolete — Keys are now cached in SessionKey objects. Retained for legacy AES engine support.