diff -r 48780e181b38 -r 578be2adaf3e Symbian3/PDK/Source/GUID-B9BD2E0A-F214-5344-91A6-E4E99F0D74C8.dita --- a/Symbian3/PDK/Source/GUID-B9BD2E0A-F214-5344-91A6-E4E99F0D74C8.dita Tue Jul 20 12:00:49 2010 +0100 +++ b/Symbian3/PDK/Source/GUID-B9BD2E0A-F214-5344-91A6-E4E99F0D74C8.dita Fri Aug 13 16:47:46 2010 +0100 @@ -1,71 +1,71 @@ - - - - - -Updating -SRTP Master Key

A single master key provides keying material for confidentiality -and integrity protection of the SRTP and the corresponding SRTCP stream.

The -SRTP master key is updated in the two circumstances:
-

An SRTP session must be created and initialized.

- - -The SRTP client receives notification of master key stale state or SRTP -client decides to update the master key for security. - -The SRTP client -updates the master key using the SetMasterKey() API of -the class CSRTPCryptoContext. - - -The prototype of the API is as described below: -
    -
  • IMPORT_C void SetMasterKey( const CSRTPMasterKey* aKey); - -

    This API updates -the master key.

    aKey is the input parameter that contains the new -master key.

  • -
-
-
-
-
-

A new master key is returned to the stream or session.

SRTP -implementation derives new session keys from the new master key.

SRTP -client updates the stream/session cryptographic context with a the new master -key.

-
-Creating -an SRTP Session -Creating -a Cryptographic Context -Creating -an SRTP Stream -Encrypting - RTCP Packet Data -Encrypting -RTP Packet Data -Decrypting -RTP Packet Data -Decrypting - RTCP Packet Data -Managing - Master Key + + + + + +Updating +SRTP Master Key

A single master key provides keying material for confidentiality +and integrity protection of the SRTP and the corresponding SRTCP stream.

The +SRTP master key is updated in the two circumstances:
    +
  • For each master key, a record of number of packets processed sent is +maintained. There is a limit on the number of packets processed that can be +processed by a single master key. During encryption or decryption of the RTP/RTCP +packets, the SRTP stack checks for the number of packets processed. If the +number of packets processed, ha s reached the maximum permisible value , the +master key status is identified as stale. The SRTP notifies the SRTP client +of the master key status. The SRTP client may decide to update the master +key in response to the notification.

  • +
  • The SRTP client may update the master key for robust security, prior +to master key stale status identification.

  • +
+

An SRTP session must be created and initialized.

+ + +The SRTP client receives notification of master key stale state or SRTP +client decides to update the master key for security. + +The SRTP client +updates the master key using the SetMasterKey() API of +the class CSRTPCryptoContext. + + +The prototype of the API is as described below: +
    +
  • IMPORT_C void SetMasterKey( const CSRTPMasterKey* aKey); + +

    This API updates +the master key.

    aKey is the input parameter that contains the new +master key.

  • +
+
+
+
+
+

A new master key is returned to the stream or session.

SRTP +implementation derives new session keys from the new master key.

SRTP +client updates the stream/session cryptographic context with a the new master +key.

+
+Creating +an SRTP Session +Creating +a Cryptographic Context +Creating +an SRTP Stream +Encrypting + RTCP Packet Data +Encrypting +RTP Packet Data +Decrypting +RTP Packet Data +Decrypting + RTCP Packet Data +Managing + Master Key
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