问题
I noticed that there are two bouncycastle provider libraries for Java; bcprov and bcprov-ext. How do they differ? How do I choose which to use?
回答1:
bcprov is typically the library you want.
bcprov-ext includes some obscure crypto algorithms that haven't been part of the main release since v1.4.0.
This is briefly explained on the latest releases page:
From release 1.40 some implementations of encryption algorithms were removed from the regular jar files at the request of a number of users. Jars with names of the form
*-ext-*still include these (at the moment the list is: NTRU).
NTRU seems to be this algorithm. Personally I'd never heard of it before...
来源：https://stackoverflow.com/questions/29211582/how-do-bcprov-and-bcprov-ext-differ