Copyright (C) 2012-2024 Simon Josefsson.  Licensed under the GPLv3+.

Current limitations of Libpskc:

* No functions to set fields, only to read them.

* The EncryptionKey and MACMethod types are not supported.

* Only PlainValue data fields are supported (i.e., EncryptedValue and
  ValueMAC fields are not supported).

* No extensions are implemented.

Otherwise Libpskc is believed to be a complete PSKC implementation
conforming to the PSKC standard RFC 6030, including the following
features:

* Parse PSKC data and print human readable information.

* Validate PSKC data against XML Schema.

* Sign and verify PSKC data using XML Digital Signatures.

Note that the GnuTLS backend of xmlsec does not implement loading
private keys from memory in PEM format.  You will get an error message
similar to this:

func=xmlSecGCryptAppKeyLoadMemory:file=app.c:line=236:obj=unknown:subj=unknown:error=9:feature is not implemented:details=xmlSecKeyDataFormatPem
func=xmlSecGCryptAppKeyLoad:file=app.c:line=189:obj=unknown:subj=xmlSecGCryptAppKeyLoadMemory:error=1:xmlsec library function failed:filename=./pskc-ee-key.pem

Currently the only known solution is to use the OpenSSL backend
instead.