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der: simplify der_cmp for Length #1997

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der: simplify der_cmp for Length #1997

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13 changes: 2 additions & 11 deletions der/src/length.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -45,10 +45,6 @@ impl Length {
#[cfg(feature = "ber")]
pub(crate) const EOC_LEN: Self = Self::new(2);

/// Maximum number of octets in a DER encoding of a [`Length`] using the
/// rules implemented by this crate.
pub(crate) const MAX_SIZE: usize = 5;

/// Create a new [`Length`] for any value which fits inside of a [`u16`].
///
/// This function is const-safe and therefore useful for [`Length`] constants.
Expand Down Expand Up @@ -336,13 +332,8 @@ impl Encode for Length {

impl DerOrd for Length {
fn der_cmp(&self, other: &Self) -> Result<Ordering> {
let mut buf1 = [0u8; Self::MAX_SIZE];
let mut buf2 = [0u8; Self::MAX_SIZE];

let buf1 = self.encode_to_slice(&mut buf1)?;
let buf2 = other.encode_to_slice(&mut buf2)?;

Ok(buf1.cmp(buf2))
// The DER encoding has the same ordering as the integer value
Ok(self.inner.cmp(&other.inner))
}
}

Expand Down