1/4/2023 0 Comments Emv tag 91![]() ![]() The byte has the following structure: No of BytesĪccording to this structure you can have any more length bytes. For example the second optional boolean "smoker" is a context specific class so that you don't mix up the two booleans "vegetarian" and "smoker".ĭepending on the value we have one or more length bytes. The application class belongs to an application or norm.Ĭontext specific and private are not in the norm and created for special cases. Universal classes are basic data types like integer, boolean, etc. OC 06 4D 7E 6C 6C 65 72 UTF8 String with a length of 6 and the value MüllerĠ2 01 1E Integer with a length of 1 and the value 30Ġ1 01 00 Optional Boolean with a length of 1 and the value falseĨ0 01 00 Optional Boolean with a length of 1 and the value false Tag Length Value 30 11 Sequence with a length of 17 Here we have the ASN.1 example encodet to the TLV structure:ģ0 11 OC 06 4D 7E 6C 6C 65 72 02 01 1E 01 01 00 80 01 00 The tag defines if the object is an integer, boolean or something else. Every data object consists of a tag, a length byte and the value/data. ![]() To encode the ASN.1 data we use the TLV Structure. There are different data types: primitiv (boolean, integer, UTF8 string) and constructed (sequence). Data Structure ASN.1 - Abstract Syntax Notation OneĪSN.1 is a language to describe data structure. ![]()
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