long time no see.
I have been working on my PHP ASN.1 parser and I got 99% of the specification implemented.
I'm having problems figuring out how the encoding pipeline of ASN.1 works, I know that there are a lot of encoding rules but I don't know if the module is supposed to be encoded or used in conjunction with ASN.1 code that is supposed to be encoded.
Like for example, if an LDAP client were to send an LDAP server credentials.
How would I encode the ASN.1 code if I were to send a response back to the LDAP client?
It seems that you need to start with a better introduction to ASN.1 which can be found on the ITU-T ASN.1 Project page at https://www.itu.int/en/ITU-T/asn1/Pages/introduction.aspx, which also has links to the actual ASN.1 Recommendations which define ASN.1. The X.680 series describe the notation while the X.690 series describe the various encoding rules. In order to "encode", you need to first select a particular encoding rule and begin with the corresponding recommendation from the X.690 series. Note that these do not necessarily describe the "encoding" or "decoding" process but precisely define what the encoded data should look like. It is up to you to put the data into that particular format as described by the encoding rule.