Monday, 22 August 2011

BER-TLV Parsing

One of the EMV devices I need to connect to uses the BER-TLV (wiki) protocol for communications. Simply put, data fields are defined by a (T)ag, (L)ength and (V)alue.
  •  The tag field (T) consists of one or more consecutive bytes. It codes a class, a type, and
    a number:

  • The length field (L) consists of one or more consecutive bytes. It codes the length of
    the following field.
  • The value field (V) codes the value of the data object
Sample code removed
Posted by Ivor Chalton

8 comments:

  1. Anonymous19 October 2011 at 01:34

    Nice - but where is ByteList defined?

    ReplyDelete
  2. Ivor Chalton19 October 2011 at 01:55

    This comment has been removed by the author.

    ReplyDelete
  3. Ivor Chalton19 October 2011 at 01:56

    @drshade - Thanks, seems I left that out. I don't have ready access to the code right now, but for this purpose, you can just create your own:

    public class ByteList : List
    etc.

    ReplyDelete
  4. Ivor Chalton19 October 2011 at 01:58

    Struggling to format the code here. ByteList just extends a generic List of type byte...

    ReplyDelete
  5. Digital Photography14 November 2012 at 07:26

    This comment has been removed by the author.

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  6. assi9 February 2015 at 23:23

    This comment has been removed by the author.

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  7. assi9 February 2015 at 23:23

    This comment has been removed by the author.

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  8. assi9 February 2015 at 23:24

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