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How to encode Tag-Length-Value (TLV) string into base64

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Posted on by Community Member

Hello ,

For those who don't know what TLV is:

Type/Tag-Length-Value (TLV) is an encoding scheme used in many communication protocols to encode data. A TLV-encoded message has a defined structure that consists of 3 sections/parts. Those are:
● Code of the message type (T) - 1 Byte fixed sizes of 1 byte (2 digits)
● Message value length (L) - 1 Byte fixed sizes of 1 byte (2 digits)
● Message value itself. (V) - Variable (variable size) includes the result of encoding the text string into hexadecimal

The coming example shows a string of TLV and the required result of encoding it into base64:

Example of a TLV:

01 15 42 6f 62 73 20 42 61 73 65 6d 65 6e 74 20 52 65 63 6f 72 64 73 02 0f 31 30 30 30 32 35 39 30 36 37 30 30 30 30 33 03 14 32 30 32 32 2d 30 34 2d 32 35 54 31 35 3a 33 30 3a 30 30 5a 04 0a 32 31 30 30 31 30 30 2e 39 39 05 09 33 31 35 30 31 35 2e 31 35

Encode this to a Base64 must represent:

ARVCb2JzIEJhc2VtZW50IFJlY29yZHMCDzEwMDAyNTkwNjcwMDAwMwMUMjAyMi0wNC0yNVQxNTozMDowMFoECjIxMDAxMDAuOTkFCTMxNTAxNS4xNQ==

Now, the question is, how to encode the previous TLV string into base64 programmatically in (AL) to get the base64 string shown above??

I hope my question is clear and thank you in advance for your support.

Regards,

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Community Member on at

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Anyone can help me ?!

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Community Member on at

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@YUN ZHU

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Community Member on at

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.....

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Lars Lohndorf-Larsen on at

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Hello,

How about this - using codeunit "Base64 Convert":

codeunit 50110 MyCodeunit

{

trigger OnRun()

begin

MyTlv :=

'01 15 42 6f 62 73 20 42 61 73 65 6d 65 6e 74 20 52 65 63 6f 72 64 73 02 0f 31 30 30 30 32 35 39 30 36 37 30 30 30 30 33 03 14 32 30 32 32 2d 30 34 2d 32 35 54 31 35 3a 33 30 3a 30 30 5a 04 0a 32 31 30 30 31 30 30 2e 39 39 05 09 33 31 35 30 31 35 2e 31 35';

Myhash := Base64.ToBase64(MyTlv);

message(MyHash);

end;

var

CryptoMgt: Codeunit "Cryptography Management";

Base64: Codeunit "Base64 Convert";

MyTlv: Text;

MyHash: Text;

}

There is another codeunit "Cryptography Management" which may also be of use there.

Would that work for you, or was that too easy :-) ?

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Community Member on at

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I'm trying to convert to base64,

the format base64 it's not fetching the result as shown above.

I need the same format to compatible with Saudi e-invoice , ZATCA On QR Code

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YUN ZHU 95,597 Super User 2025 Season 2 on at

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Hi, I'm sorry I haven't tested it, but I hope the following information can give you some help.

Another C# sample

https://stackoverflow.com/questions/70260145/saudi-arabia-e-invoicing-qr-code-tlv-with-base64-encoding-in-c-sharp

Thanks.

ZHU

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mohamed gamal on at

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Did you solve it?

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