Read details from encrypted frame

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Anonymous
2012-04-26
2013-04-25
  • Anonymous - 2012-04-26

    Hello,

    I am working on a digital cinema project that uses the  MXF files. While I was on the area of encryption/decryption of  a mxf, I need to extract IV,CV,Essence(including padding),MIC seperately.

    I know that IV,CV are 16 bytes each,but how can i extract it from a frame that is encrypted?

    Thanks in advance,

     
  • Matt Beard

    Matt Beard - 2012-04-26

    Hi,

    The IV and encrypted Check Value are first 16 bytes of the "Encrypted Source Value" specified in Table 9 of SMPTE 429-6-2006.  The MIC is the last entry in the pack.

    If you don't have access to SMPTE 429-6-1006, but can read the raw Encrypted value KLVs, then you will need to parse it as BER-Length + Value pairs (any of which may have a length of zero meaning no value). The forth of these items is the Encrypted Source (+padding). This value will start with16 bytes of IV, then 16 bytes of Check Value. There are three optional values after the encrypted value, the third of which is the MIC.

     

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