Release 3.5.7

Hotfix - 8/28/2020

• Merged (PR 209). Thanks s0l0ist!

Bug fixes

• Fixed an omission in input validation in decryption: the size of the ciphertext was not checked to be non-zero.

Other

• In Windows switch to using RtlGenRandom if the BCrypt API fails.
• Improved performance in serialization: data clearing memory pools were always used before, but now are only used for the secret key.
• Use native APIs for memory clearing, when available, instead of for-loop.