ASN1

ASN1 is a native Mac workspace for people working with ASN.1 schemas, values, and encoded payloads.
If you are an engineer, developer or researcher in the field of telecom, embedded, cryptography, protocols or QA this app might be a useful addition to your toolbox.

Free version:
- Write and validate ASN.1 schemas from scratch
- Start from built-in examples for X.509 certificates and CRL, OCSP, LDAP, SNMP, Kerberos, and Time-Stamp Protocol workflows
- Check values compliance against a selected ASN.1 root
- Encode values to DER, BER, OER, XER, GSER, PER, and UPER
- Decode binary payloads back into readable values
- Inspect BER and DER bytes in a structured, human-readable view
- Open, save, import, and export schema, value, and binary payload files

Pro version (one time purchase in app):
-Generate valid sample values for any ASN1 schema
-Editing BER/DER binary directly in a structured view

ASN1 is designed for local protocol implementation, testing, debugging, and byte-level inspection. 
Your schemas, values, and payloads stay on your Mac.