Creates a new CryptoContext object with a single MasterKey. Use this constructor when building a SRTP crypto context for sending SRTP and SRTCP packets.

Declaration

public CryptoContext(string cryptoSuite)

Parameters

Type	Name	Description
string	cryptoSuite	Specifies the name of the crypto suite to use.

Fields

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AuthTagLength

Specifies the length in bytes of the packet authentication tag that is appended to each RTP or RTCP packet. Will be equal to 10 or 4 depending upon the crypto suite being used.

Declaration

public int AuthTagLength

Field Value

Type	Description
int

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CurrentRtcpMasterKeyIndex

Index of the current maser key in the MasterKeys list for RTCP.

Declaration

public int CurrentRtcpMasterKeyIndex

Field Value

Type	Description
int

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CurrentRtpMasterKeyIndex

Index of the current master key in the MasterKeys list for RTP.

Declaration

public int CurrentRtpMasterKeyIndex

Field Value

Type	Description
int

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HighestSeq

Highest received RTP sequence number. This value is the s_l variable in Section 3.3.1 of RFC 3711. This is used by the receiver only.

Declaration

public ushort HighestSeq

Field Value

Type	Description
ushort

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MasterKeys

Contains the master keys and master salts used for this crypto context. Will contain at least one entry.

Declaration

public List<MasterKeys> MasterKeys

Field Value

Type	Description
List<MasterKeys>

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MaxSendRtcpIndex

Maximum RTCP Index value. 2^31 - 1 because only 31 bits of the RTCP index are used, the MS bit is used to indicate encryption.

Declaration

public const uint MaxSendRtcpIndex = 2147483647

Field Value

Type	Description
uint

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MkiIndicator

If true, then each SRTP or SRTCP packet will be appended by a Master Key Indentifier (MKI) value that identifies the master encryption key used for that packet. If false, then no MKI will be attached to the packets.

Declaration

public bool MkiIndicator

Field Value

Type	Description
bool

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MkiLength

Specifies the length in bytes of the MKI attached to each SRTP or SRTCP packet. Used only if MkiIndicator is true.

Declaration

public int MkiLength

Field Value

Type	Description
int

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ROC

Current Roll Over Counter (ROC) values. The ROC represents the number of times that the SEQ number of the SRTP packets has been reset to 0. The ROC is not used for RTCP.

Declaration

public RocVals ROC

Field Value

Type	Description
RocVals

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RtcpSessionKeys

Stores the current session keys (key, salt and auth. key) for SRTCP.

Declaration

public SessionKeys RtcpSessionKeys

Field Value

Type	Description
SessionKeys

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RtpSessionKeys

Stores the current session keys (key, salt and auth. key) for SRTP.

Declaration

public SessionKeys RtpSessionKeys

Field Value

Type	Description
SessionKeys

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SendRtcpIndex

SRTP Index used for sending RTCP packets

Declaration

public uint SendRtcpIndex

Field Value

Type	Description
uint

Properties

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CryptoSuite

Gets the crypto suite name used by this crypto context.

Declaration

public string CryptoSuite { get; }

Property Value

Type	Description
string

Methods

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CreateFromCryptoAttribute(CryptoAttribute)

Creates a new CryptoContext object from a CryptoAttribute object.

Declaration

public static CryptoContext CreateFromCryptoAttribute(CryptoAttribute attr)

Parameters

Type	Name	Description
CryptoAttribute	attr	Input CryptoAttribute

Returns

Type	Description
CryptoContext	Returns a new CryptoContext object

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ToCryptoAttribute()

Converts this crypto context object into a CryptoAttribute object.

Declaration

public CryptoAttribute ToCryptoAttribute()

Returns

Type	Description
CryptoAttribute	Returns a new CryptoAttribute object