Commits on Dec 11, 2019

1. Symmetric keygen: JavaThemis …

   More or less straightforward, if involved implementation. The main class
   is SymmetricKey which manages input validation and delegates actual key
   generation to JNI code.
   
   JNI returns "null" on errors, just like other methods, because it's
   easier to deal with Java exceptions from Java.
   
   Note the cast from jbyte* to uint8_t*. It is necessary because Java
   bytes are always signed, but uint8_t is unsigned. Later we cast them
   back so this does not cause any problems.
   
   We add more constructors to KeyGenerationException because now we need
   to have some messages there as there are two places where keys are
   generated.
   
   Do not export new constructors for KeyGenerationException. There is no
   reason for the users to construct instances of these exceptions.
   
   Historically we had constructors for other exceptions, but that's
   a mistake. We can't hide them without breaking compatibility, but we
   can avoid making the same mistake again.

   

   ilammy committed Dec 11, 2019
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