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- xmlsec and libxmlsec for Debian
- -------------------------------
-
- The upstream documentation is included with the libxmlsec1-dev package and
- located at /usr/share/doc/libxmlsec1-dev.
-
- When developing with the xmlsec library, you have a choice of openssl,
- gnutls, or nss crypto engines. By using "pkg-config xmlsec1-<engine>" or
- "xmlsec1-config --crypto=<engine>", you can get the necessary compiler
- command-line switches for enabling a certain engine.
-
- If you want to license your application that uses the xmlsec library under
- the GNU GPL, or want your library that uses the xmlsec library to be GPL-
- compatible, I suggest using the gnutls engine. Use of the nss crypto engine
- may also be compatible with the GPL, but see bugs #207024 and #207026.
- Regarding openssl, there is a bit of controversy about whether it can be
- considered part of the OS and therefore make use of a loophole in the GPL.
- (See the xmlsec FAQ in the documentation.) More specifically, debian-legal
- takes a hard line and does not allow GPL'd packages that link to openssl to
- exist in main. In the future, support for PGP key types may be added, which
- would become another reason to go with the gnutls engine.
-
- Note that the library has a dynamic crypto engine loading feature, but I
- have not yet enabled it.
-
- Regarding nss crypto engine support, beware that there are a number of
- packaging issues with depending on libnss and libnspr (part of the mozilla
- source package) which may cause trouble down the road (see bugs #200877,
- #200878, #207008, #207009, and #48208).
-
- Note that a number of the examples included with the -dev package will
- not compile successfuly under the gnutls engine (due to lack of features
- compared to openssl), and will fail under both the gnutls and nss engines
- (due to lack of pem file support, etc.).
-
- Upstream has promised that they will increment the number in the library name
- name (for example, xmlsec1 -> xmlsec2) whenever a binary incompatibility is
- introduced, and that it will always match the soname number. For this
- reason I chose to omit the soname number from package names.
-
-
- -- John V. Belmonte <jbelmonte@debian.org>
-