Function passwords::hasher::bcrypt

pub fn bcrypt<T: ?Sized + AsRef<[u8]>, K: ?Sized + AsRef<[u8]>>(
    cost: u8, 
    salt: &K, 
    password: &T
) -> Result<[u8; 24], &'static str>

Use bcrypt to hash a password (the null-terminated byte will not be added automatically) whose length is not bigger than 72 bytes to 24 bytes data. If the salt is not 16 bytes, it will be MD5 hashed first.