```
public class ScramSessionCache
extends Object
```
Thread-safe cache for SCRAM reauthentication data (RFC 7804 §5.1). Keyed by (host, port, realm). Stores derived keys (NOT SaltedPassword).

Nested Classes
Modifier and Type	Class	Description
`static class`	`ScramSessionCache.CacheKey`	Cache key: (host, port, realm).
`static class`	`ScramSessionCache.Entry`	Cached session entry for reauthentication.

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`clear()`
`void`	`confirmNonceCount(ScramSessionCache.CacheKey key)`	Confirm nonce-count after successful reauthentication.
`@Nullable ScramSessionCache.Entry`	`get(ScramSessionCache.CacheKey key)`
`boolean`	`isSrFresh(ScramSessionCache.Entry entry)`	Check if the sr value is still fresh.
`void`	`put(ScramSessionCache.CacheKey key, ScramSessionCache.Entry entry)`
`int`	`reserveNonceCount(ScramSessionCache.CacheKey key)`	Atomically reserve and increment the nonce-count for use in a request.
`void`	`rollbackNonceCount(ScramSessionCache.CacheKey key)`	Rollback nonce-count on failure or stale response by decrementing.
`int`	`size()`
`void`	`updateSr(ScramSessionCache.CacheKey key, String newSr, int newTtl)`	Update the server nonce (sr) after a stale response.

public ScramSessionCache(int maxEntries)

public void put(ScramSessionCache.CacheKey key,
                ScramSessionCache.Entry entry)

@Nullable
public @Nullable ScramSessionCache.Entry get(ScramSessionCache.CacheKey key)

public void updateSr(ScramSessionCache.CacheKey key,
                     String newSr,
                     int newTtl)

Update the server nonce (sr) after a stale response.

isSrFresh
```
public boolean isSrFresh(ScramSessionCache.Entry entry)
```
Check if the sr value is still fresh. If ttl == -1: always fresh (no expiration). If ttl >= 0: check elapsed time since sr was received.

reserveNonceCount
```
public int reserveNonceCount(ScramSessionCache.CacheKey key)
```
Atomically reserve and increment the nonce-count for use in a request. Call rollbackNonceCount on failure to undo.

confirmNonceCount
```
public void confirmNonceCount(ScramSessionCache.CacheKey key)
```
Confirm nonce-count after successful reauthentication. No-op since already incremented.

rollbackNonceCount
```
public void rollbackNonceCount(ScramSessionCache.CacheKey key)
```
Rollback nonce-count on failure or stale response by decrementing.

Constructors
Constructor	Description
`ScramSessionCache()`
`ScramSessionCache(int maxEntries)`

Class ScramSessionCache