Equal function returns true if encoded password and salt equals hash.

Hash function returns Argon2 hash of the password and salt.

InitLogger function initialize logger.

IntEnv function set parsed variable to int pointer if environment variable is present and variable can be parsed.

Salt function returns the random salt.

StringEnv function set variable to string pointer if environment variable is present.

Log is global variable.

TokenIsMissing is a used as a return value from Verify to indicate that the token is missing.

TokenIsNotValid is a used as a return value from Verify to indicate that the token is missing.

WrongTokenLength is a used as a return value from Verify to indicate that the token length not equals to config length.

CustomFormatter is a struct that implements Formatter interface.

TokenConfig is a struct with parameters for token generating and verification.

LevelValue type is logging level that implements Value interface.