byte[] rawKey = keyManager.getRawKey(sessionId);
        assertNotNull(rawKey, "Should retrieve raw key");
        assertArrayEquals(testKey, rawKey, "Raw key should match");

        // Verify we get a copy, not the original
        rawKey[0] = (byte) ~rawKey[0];
        byte[] rawKey2 = keyManager.getRawKey(sessionId);
        assertArrayEquals(testKey, rawKey2, "Should still match original");
    }

        checkNotClosed();

        // Remove from memory maps
        SecretKey secretKey = sessionKeys.remove(sessionId);
        byte[] rawKey = rawKeys.remove(sessionId);

        // Wipe the raw key bytes
        if (rawKey != null) {
            Arrays.fill(rawKey, (byte) 0);
        }

        // Destroy the SecretKey if possible
        if (secretKey instanceof Destroyable) {
            try {