/*

* Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:    Contains SRTP definitions and constants.

*

*/

#ifndef __SRTP_DEF_H__

#define __SRTP_DEF_H__

// INCLUDES

#include <e32def.h>

#include <e32des8.h>

// CONSTANTS

//Block size of the 128 bit AES-CM in bytes

const TInt KAESCM128BlockSizeInBytes = 0x10;

const TInt KMinSizeRtpHeader = 12; // 96 bits in header, 96/8 = 12

const TInt KMinSizeRtcpHeader = 8; // 96 bits in header, 96/8 = 12

// The 80 bit length of the HMAC-SHA1 authentication tag (n_tag)

const TUint KSRTPAuthTagLength80 = 80;

//recommending to use in RCCm1 or RCCm2 as 14 octets

const TUint KSRTPAuthTagLength112 = 112;

// 4 octets32 bits

const TUint KSRTPROCLength4 = 4; 

// The 32 bit length of the HMAC-SHA1 authentication tag (n_tag)

// Also recommending in RCCm3 as 4 octects

const TUint KSRTPAuthTagLength32 = 32;

// The default bit length of the HMAC-SHA1 authentication tag (n_tag)

const TUint KSRTPAuthTagDefaultLength = KSRTPAuthTagLength80;

// The default length of the SRTP prefix

const TUint KSRTPPrefixLength = 0;

// default SRTP key derivation rate: 0

const TUint16 KSRTPDefaultKeyDerivationRate = 0x00;

// default SRTP ROC Transmission rate: 1

const TUint16 KSRTPDefaultROCTransRate = 0x01;

const TUint KSRTCPPacketIndexLength4 = 4; 

// default label values

const TUint KSRTPEncryptionLabel = 0x00;

const TUint KSRTPAuthenticationLabel = 0x01;

const TUint KSRTPSaltingLabel = 0x02;

const TUint KSRTCPEncryptionLabel = 0x03;

const TUint KSRTCPAuthenticationLabel = 0x04;

const TUint KSRTCPSaltingLabel = 0x05;

// default SRTP SESSION key lengths:

// default bit length (n_e) for session encryption key (k_e):

// 128 bits (16 octets)

const TUint KSRTPDefSessionEncryptionKeyLength = 0x80;

// default bit length (n_s) for session salt key (k_s):

// 112 bits (14 octets)

const TUint KSRTPDefSessionSaltingKeyLength = 0x70;

// default bit length (n_a) for session authentication key (k_a):

// 160 bits (20 octets)

const TUint KSRTPDefSessionAuthenticationKeyLength = 0xa0;

// default SRTP MASTER key lengths:

// default bit length for SRTP master key (128-bit AES):

// 128 bits (16 octets)

const TUint16 KSRTPDefaultMasterKeyLength = 0x80;

// default bit length for SRTP master salt 

// 112 bits (14 octets)

const TUint16 KSRTPDefaultMasterSaltLength = 0x70;

// SRTP limit values

// max SRTP plain/cipher text length is 2^23 == 0x80000

// since we use 8 bit descriptors, divide this with 2

const TUint KSRTPMaxTextLength = 0x40000;

// max SRTP keystream 128 bit blocks is 2^16 == 0x10000

// for an IV value we can not create more keystream blocks

// KSRTPMaxKeyStreamBlocks * 128 equals KSRTPMaxTextLength * 2 

const TUint KSRTPMaxKeyStreamBlocks = 0x10000;

const TInt KReplayWindowSize = 64;

//2^48 -1 for SRTP

const TUint64 KSRTPMasterKeysLifeTime = 0xFFFFFFFFFFFF;

const TUint32 KLeftNumOfPacketBeforeReKey = 0x64;

//2^31 -1 for SRTCP

const TUint64 KSRTCPMaterKeysLifeTime = 0x7FFFFFFF;

#endif // __SRTP_DEF_H__