2025 nightly

Supersedes #640.

crypto/dalek-ff-group/src/field.rs

@@ -92,7 +92,7 @@ impl Neg for FieldElement {
   }
 }
 
-impl<'a> Neg for &'a FieldElement {
+impl Neg for &FieldElement {
   type Output = FieldElement;
   fn neg(self) -> Self::Output {
     (*self).neg()

crypto/dleq/src/lib.rs

@@ -37,11 +37,11 @@ pub(crate) fn challenge<T: Transcript, F: PrimeField>(transcript: &mut T) -> F {
   // Get a wide amount of bytes to safely reduce without bias
   // In most cases, <=1.5x bytes is enough. 2x is still standard and there's some theoretical
   // groups which may technically require more than 1.5x bytes for this to work as intended
-  let target_bytes = ((usize::try_from(F::NUM_BITS).unwrap() + 7) / 8) * 2;
+  let target_bytes = usize::try_from(F::NUM_BITS).unwrap().div_ceil(8) * 2;
   let mut challenge_bytes = transcript.challenge(b"challenge");
   let challenge_bytes_len = challenge_bytes.as_ref().len();
   // If the challenge is 32 bytes, and we need 64, we need two challenges
-  let needed_challenges = (target_bytes + (challenge_bytes_len - 1)) / challenge_bytes_len;
+  let needed_challenges = target_bytes.div_ceil(challenge_bytes_len);
 
   // The following algorithm should be equivalent to a wide reduction of the challenges,
   // interpreted as concatenated, big-endian byte string

crypto/evrf/generalized-bulletproofs/src/arithmetic_circuit_proof.rs

@@ -33,7 +33,7 @@ pub struct ArithmeticCircuitStatement<'a, C: Ciphersuite> {
   V: PointVector<C>,
 }
 
-impl<'a, C: Ciphersuite> Zeroize for ArithmeticCircuitStatement<'a, C> {
+impl<C: Ciphersuite> Zeroize for ArithmeticCircuitStatement<'_, C> {
   fn zeroize(&mut self) {
     self.constraints.zeroize();
     self.C.zeroize();

crypto/evrf/generalized-bulletproofs/src/lib.rs

@@ -247,7 +247,7 @@ impl<C: Ciphersuite> Generators<C> {
   }
 }
 
-impl<'a, C: Ciphersuite> ProofGenerators<'a, C> {
+impl<C: Ciphersuite> ProofGenerators<'_, C> {
   pub(crate) fn len(&self) -> usize {
     self.g_bold.len()
   }

crypto/frost/src/sign.rs

@@ -203,14 +203,15 @@ pub trait SignMachine<S>: Send + Sync + Sized {
   /// SignatureMachine this SignMachine turns into.
   type SignatureMachine: SignatureMachine<S, SignatureShare = Self::SignatureShare>;
 
-  /// Cache this preprocess for usage later. This cached preprocess MUST only be used once. Reuse
-  /// of it enables recovery of your private key share. Third-party recovery of a cached preprocess
-  /// also enables recovery of your private key share, so this MUST be treated with the same
-  /// security as your private key share.
+  /// Cache this preprocess for usage later.
+  ///
+  /// This cached preprocess MUST only be used once. Reuse of it enables recovery of your private
+  /// key share. Third-party recovery of a cached preprocess also enables recovery of your private
+  /// key share, so this MUST be treated with the same security as your private key share.
   fn cache(self) -> CachedPreprocess;
 
   /// Create a sign machine from a cached preprocess.
-
+  ///
   /// After this, the preprocess must be deleted so it's never reused. Any reuse will presumably
   /// cause the signer to leak their secret share.
   fn from_cache(
@@ -219,11 +220,14 @@ pub trait SignMachine<S>: Send + Sync + Sized {
     cache: CachedPreprocess,
   ) -> (Self, Self::Preprocess);
 
-  /// Read a Preprocess message. Despite taking self, this does not save the preprocess.
-  /// It must be externally cached and passed into sign.
+  /// Read a Preprocess message.
+  ///
+  /// Despite taking self, this does not save the preprocess. It must be externally cached and
+  /// passed into sign.
   fn read_preprocess<R: Read>(&self, reader: &mut R) -> io::Result<Self::Preprocess>;
 
   /// Sign a message.
+  ///
   /// Takes in the participants' preprocess messages. Returns the signature share to be broadcast
   /// to all participants, over an authenticated channel. The parties who participate here will
   /// become the signing set for this session.

crypto/multiexp/src/lib.rs

@@ -59,7 +59,7 @@ pub(crate) fn prep_bits<G: Group<Scalar: PrimeFieldBits>>(
   for pair in pairs {
     let p = groupings.len();
     let mut bits = pair.0.to_le_bits();
-    groupings.push(vec![0; (bits.len() + (w_usize - 1)) / w_usize]);
+    groupings.push(vec![0; bits.len().div_ceil(w_usize)]);
 
     for (i, mut bit) in bits.iter_mut().enumerate() {
       let mut bit = u8_from_bool(&mut bit);