CheckPassword allows to compare password from request with salted value from database.

GenSalt generates a salt from given data.

GetByteKey generates a salted password using pbkdf2 algorithm.

GetKey works same as GetByteKey but returns result as string.

SecureRandomBytes returns the requested number of bytes using crypto/rand.

SecureRandomString securly generates random string.

WebAPIPasswordEncode needed to encode password with function from old web-api to allow old users to login.