//! Lowercase hex encoding for digest outputs (`GenericArray` is not `LowerHex`).
usestd::fmt::Write as_;pub(crate)fnhex_lower(bytes:&[u8])-> String{letmut s =String::with_capacity(bytes.len()*2);for&b in bytes {write!(&mut s,"{:02x}", b).expect("write to String cannot fail");}
s
}