zouzou,

As Andreas already said, currently you should just accept that iText is
built to use BC.

zouzou wrote
> What are best practices for using iText-5.3.0 with another provider for
> that BC sign with SHA256?

Currently BC is hardwired in some iText classes. The existence of a number
of method overloads with an additional provider argument is a hint, though,
that iText aims at providing the covered functionality with other security
providers, too. I don't know how far this support already works.

zouzou wrote
> In the previous post to answer me you talked about overload functions,
> what are these functions?

Overloaded methods are methods of the same class with the same name but
different parameter types, e.g. KeyStoreUtil.loadCacertsKeyStore(String) and
KeyStoreUtil.loadCacertsKeyStore().

zouzou wrote
> If one has no choice to use another provider than BC when or in what place
> should add?

Unless some other code in your program time and time again changes the list
of registered security providers, doing it once during startup should
suffice. Wheter or not BC needs to be at a special position in that list,
depends on the requirements of all the components of your program making use
of security provider functions. Sometimes it's quite a hassle to put them in
the right order... ;)

Regards,   Michael

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