Part 2
If you have the ASN.1 specification, it is best to get an ASN.1 compiler that reads the ASN.1 specification and generates C, C ++, C #, or Java code that conforms to ASN.1 structures. There are many commercial and free ASN.1 tools, and many of the commercial ASN.1 tools offer free trials. You can see a good list of ASN.1 tools at http://www.itu.int/ITU-T/asn1/links/index.htm , where you can also find additional useful ASN.1 information.
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