libksba-mingw-w64-dev 1.3.5-2 (s390x binary) in ubuntu focal

 KSBA (pronounced Kasbah) is a library to make X.509 certificates as
 well as the CMS easily accessible by other applications. Both
 specifications are building blocks of S/MIME and TLS.
 .
 KSBA provides these subsystems: ASN.1 Parser, BER Decoder, BER
 Encoder, Certificate Handling and CMS Handling.
 .
 This package contains the runtime library files.
 .
 This is a Windows version of KSBA. It's meant to be used when
 cross-building software that targets the Windows platform, e.g. the
 win32-loader component of Debian-Installer.