@class NSUUID, NSMutableDictionary, NSData, NSMutableData, NSMutableArray;
@interface IDSGroupEncryptionKeyManager : NSObject {
struct os_unfair_lock_s { unsigned int _os_unfair_lock_opaque; } _lock;
NSMutableData *_encryptionContext;
unsigned long long _encryptionKeySize;
NSMutableArray *_previousEncryptingKeys;
NSMutableArray *_previousEncryptingKeyIndexes;
NSMutableArray *_previousEncryptingKeySalts;
NSData *_currentEncryptingKey;
NSUUID *_currentEncryptingKeyIndex;
NSData *_currentEncryptingKeySalt;
unsigned int _currentEncryptingKeyGeneration;
NSMutableDictionary *_currentDecryptingKeysAndSalts;
}
- (void).cxx_destruct;
- (void)enumerateDecryptingKeysAndSaltsUsingBlock:(id /* block */)a0;
- (id)initWithEncryptionContext:(id)a0 encryptionKeySize:(unsigned long long)a1;
- (void)invalidateKeyMaterialByKeyIndexes:(id)a0;
- (void)recvKeyMaterial:(id)a0;
- (BOOL)useCurrentEncryptionkeyWithHandler:(id /* block */)a0;
- (void)purgeOldKeyMaterial;
- (void)receiveMembershipChangedInformation:(unsigned char)a0;
- (BOOL)useDecryptingKeyForKeyIndex:(id)a0 handler:(id /* block */)a1;
@end