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First Publicly Shared Version of ODKiTEE v15

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John W. Bruce
2020-07-24 12:03:58 -07:00
commit eaa8984c06
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oemcrypto_ta/oemcrypto_session_table.h Normal file
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/* Copyright 2019 Google LLC. All Rights Reserved. This file and proprietary
source code may only be used and distributed under the Widevine Master
License Agreement. */
#ifndef OEMCRYPTO_TA_OEMCRYPTO_SESSION_TABLE_H_
#define OEMCRYPTO_TA_OEMCRYPTO_SESSION_TABLE_H_
#include "OEMCryptoCENC.h"
#include "oemcrypto_config_interface.h"
#include "oemcrypto_session.h"
typedef struct SessionTable {
OEMCryptoSession sessions[MAX_NUMBER_OF_SESSIONS];
uint32_t first_free_session;
uint32_t next_free_session[MAX_NUMBER_OF_SESSIONS];
bool is_free[MAX_NUMBER_OF_SESSIONS];
} SessionTable;
/* Initializes the session table for future OpenSession calls. Returns
OEMCrypto_ERROR_INIT_FAILED if the session table has already been initialized
and OEMCrypto_SUCCESS otherwise. */
OEMCryptoResult InitializeSessionTable(void);
/* Gets the max number of sessions. */
uint32_t MaxNumberOfSessions(void);
/* Gets the number of open sessions. Returns OEMCrypto_ERROR_SYSTEM_INVALIDATED
if the session table has not been initialized and OEMCrypto_SUCCESS
otherwise.
Caller retains ownership of |num_open_sessions| and it must not be NULL. */
OEMCryptoResult NumberOfOpenSessions(uint32_t* num_open_sessions);
/* Attempts to grab an open entry in the session table and set |index| to the
entry position. Returns OEMCrypto_ERROR_SYSTEM_INVALIDATED if the session
table has not been initialized and OEMCrypto_ERROR_TOO_MANY_SESSIONS if there
are no sessions left to grab. Returns OEMCrypto_SUCCESS otherwise.
Caller retains ownership of |index| and it must not be NULL. */
OEMCryptoResult GrabSession(uint32_t* index);
/* Sets session to the session at |index| in the session table if it is free.
Returns OEMCrypto_ERROR_SYSTEM_INVALIDATED if the session table has not been
initialized and OEMCrypto_ERROR_INVALID_SESSION if the session has not been
grabbed or if the index is invalid. Returns OEMCrypto_SUCCESS otherwise.
Caller retains ownership of |session| and it must not be NULL. */
OEMCryptoResult GetSession(uint32_t index, OEMCryptoSession** session);
/* Given a non-free session |index|, attempts to free it so it can be reused.
Returns OEMCrypto_ERROR_SYSTEM_INVALIDATED if the session table has not been
initialized and OEMCrypto_ERROR_INVALID_SESSION if the session has not been
grabbed or if the index is invalid. Returns OEMCrypto_SUCCESS otherwise. */
OEMCryptoResult FreeSession(uint32_t index);
/* Clears and cleans up the session table. The session table must be
reinitialized to be used. Returns OEMCrypto_ERROR_TERMINATE_FAILED if the
table has not been initialized or if there are any active sessions still.
Returns OEMCrypto_SUCCESS otherwise. */
OEMCryptoResult TerminateSessionTable(void);
#endif /* OEMCRYPTO_TA_OEMCRYPTO_SESSION_TABLE_H_ */