Edition of DER encoded ASN.1 structures is a pretty tedious work when done manually. Solutions to this problem exist. For instance, der-ascii [0] is a tool written in Go that helps with back and forth conversions from/to DER structures to/from a textual representation using a custom defined language. I present a somehow short Perl script [1] that leverages the OpenSSL configuration language along with the ASN1_generate_nconf(3) function in order to achieve the same goal with almost no dependencies apart from Perl and OpenSSL. This tool can be used to ease the exploitation of CVE-2022-0778 [2] & [3]. [0] https://github.com/google/der-ascii [1] https://github.com/wllm-rbnt/asn1template [2] https://www.openssl.org/news/secadv/20220315.txt [3] https://github.com/drago-96/CVE-2022-0778#using-asn1-templates