OSS ASN-1Step is a versatile and flexible tool built to ease ASN.1 application development and testing.-You can start building and verifying complex messages with no programming or training. You can create or modify test messages from ASN.1 value notation on the fly and encode them using BER, DER, PER, CER, XER, or CXER without writing a single line of code
ASN-1Step enables you to see the encoding of any value will look before writing your application.-You can message within minutes.

Using ASN-1Step you can quickly pinpoint syntax and semantic errors that may otherwise have taken hours to find and easily analyze and document application messages