I need to buy Encoding and decoding tools and libraries ASN.1, the company name is Nokalva OSS, the hardware platform is X86, the operating system is Linux 64 bit.
I've searched what you asked above and it appears there is already a website called OSS Nokalva that contains all the necessary tools, libraries, development tools that can be used for the ASN.1. You can access this website using the link posted below.
There are also the tools from ITU that you could try: http://www.itu.int/en/ITU-T/asn1/Pages/Tools.aspx