I2NP + ECIES: fixes for thread safety and correctness
Adds fixes for properly locking I2NP block + message class members, and calculating ECIES payload random padding length.
Minor fixes to ECIES SessionManager unit tests for easier debugging.
Adds fixes for properly locking I2NP block + message class members, and calculating ECIES payload random padding length.
Minor fixes to ECIES SessionManager unit tests for easier debugging.