Function passwords::hasher::bcrypt_format

pub fn bcrypt_format<T: ?Sized + AsRef<[u8]>, K: ?Sized + AsRef<[u8]>>(
    cost: u8, 
    salt: &K, 
    password: &T
) -> Result<String, &'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. The result will be in Modular Crypt Format. If the salt is not 16 bytes, it will be MD5 hashed first.