Fix Cargo clippy (lambdaclass#944)

* fix clippy

* fix clippy

* change div_ceil and comment on expect()

* fix div_ceil

---------

Co-authored-by: jotabulacios <jbulacios@fi.uba.ar>
Co-authored-by: Nicole <nicole@Nicoles-MacBook-Air.local>

Author: 3 people

crypto/src/hash/poseidon/mod.rs

@@ -77,7 +77,7 @@ impl<P: PermutationParameters> Poseidon for P {
         // Pad input with 1 followed by 0's (if necessary).
         let mut values = inputs.to_owned();
         values.push(FE::from(1));
-        values.resize(((values.len() + r - 1) / r) * r, FE::zero());
+        values.resize(values.len().div_ceil(r) * r, FE::zero());
 
         assert!(values.len() % r == 0);
         let mut state: Vec<FE<Self::F>> = vec![FE::zero(); m];

crypto/src/hash/sha3/mod.rs

@@ -16,7 +16,7 @@ impl Sha3Hasher {
     pub fn expand_message(msg: &[u8], dst: &[u8], len_in_bytes: u64) -> Result<Vec<u8>, String> {
         let b_in_bytes = Sha3_256::output_size() as u64;
 
-        let ell = (len_in_bytes + b_in_bytes - 1) / b_in_bytes;
+        let ell = len_in_bytes.div_ceil(b_in_bytes);
         if ell > 255 {
             return Err("Abort".to_string());
         }

math/src/elliptic_curve/short_weierstrass/curves/bls12_377/pairing.rs

@@ -232,13 +232,11 @@ fn frobenius_square(
 }
 
 ////////////////// CYCLOTOMIC SUBGROUP OPERATIONS //////////////////
-/// Since the result of the Easy Part of the Final Exponentiation belongs to the cyclotomic
-/// subgroup of Fp12, we can optimize the square and pow operations used in the Hard Part.
-
+// Since the result of the Easy Part of the Final Exponentiation belongs to the cyclotomic
+// subgroup of Fp12, we can optimize the square and pow operations used in the Hard Part.
 /// Computes the square of an element of a cyclotomic subgroup of Fp12.
 /// Algorithm from Constantine's cyclotomic_square_quad_over_cube
 /// https://github.com/mratsim/constantine/blob/master/constantine/math/pairings/cyclotomic_subgroups.nim#L354
-
 pub fn cyclotomic_square(a: &Fp12E) -> Fp12E {
     // a = g + h * w
     let [g, h] = a.value();

math/src/elliptic_curve/short_weierstrass/curves/bls12_381/pairing.rs

@@ -40,8 +40,7 @@ pub const X_BINARY: &[bool] = &[
 ];
 
 // GAMMA constants used to compute the Frobenius morphisms
-/// We took these constants from https://github.com/hecmas/zkNotebook/blob/main/src/BLS12381/constants.ts
-
+// We took these constants from https://github.com/hecmas/zkNotebook/blob/main/src/BLS12381/constants.ts
 pub const GAMMA_11: Fp2E = Fp2E::const_from_raw([
     FpE::from_hex_unchecked("1904D3BF02BB0667C231BEB4202C0D1F0FD603FD3CBD5F4F7B2443D784BAB9C4F67EA53D63E7813D8D0775ED92235FB8"),
     FpE::from_hex_unchecked("FC3E2B36C4E03288E9E902231F9FB854A14787B6C7B36FEC0C8EC971F63C5F282D5AC14D6C7EC22CF78A126DDC4AF3"),
@@ -315,8 +314,8 @@ fn frobenius_square(
 }
 
 ////////////////// CYCLOTOMIC SUBGROUP OPERATIONS //////////////////
-/// Since the result of the Easy Part of the Final Exponentiation belongs to the cyclotomic
-/// subgroup of Fp12, we can optimize the square and pow operations used in the Hard Part.
+// Since the result of the Easy Part of the Final Exponentiation belongs to the cyclotomic
+// subgroup of Fp12, we can optimize the square and pow operations used in the Hard Part.
 
 /// Computes the square of an element of a cyclotomic subgroup of Fp12.
 /// Algorithm from Constantine's cyclotomic_square_quad_over_cube

math/src/elliptic_curve/short_weierstrass/curves/bn_254/compression.rs

@@ -26,7 +26,6 @@ type BN254FieldElement = FieldElement<BN254PrimeField>;
 /// 01: compressed infinity point
 /// the "uncompressed infinity point" will just have 00 (uncompressed) followed by zeroes (infinity = 0,0 in affine coordinates).
 /// adapted from gnark https://github.com/consensys/gnark-crypto/blob/v0.13.0/ecc/bn254/marshal.go
-
 impl Compress for BN254Curve {
     type G1Point = G1Point;
 

math/src/elliptic_curve/short_weierstrass/curves/bn_254/pairing.rs

@@ -32,12 +32,12 @@ type Fp12E = FieldElement<Degree12ExtensionField>;
 type G1Point = ShortWeierstrassProjectivePoint<BN254Curve>;
 type G2Point = ShortWeierstrassProjectivePoint<BN254TwistCurve>;
 
-/// You can find an explanation of the next implemetation in our post
-/// https://blog.lambdaclass.com/how-we-implemented-the-bn254-ate-pairing-in-lambdaworks/
-/// There you'll come across a path to understand the naive implementation of the pairing
-/// using the functions miller_naive() and final_exponentiation_naive().
-/// We then optimized the pairing using the functions miller_optimized() and final_exponentiation_optimized().
-/// You'll find both the naive and optimized versions below.
+// You can find an explanation of the next implemetation in our post
+// https://blog.lambdaclass.com/how-we-implemented-the-bn254-ate-pairing-in-lambdaworks/
+// There you'll come across a path to understand the naive implementation of the pairing
+// using the functions miller_naive() and final_exponentiation_naive().
+// We then optimized the pairing using the functions miller_optimized() and final_exponentiation_optimized().
+// You'll find both the naive and optimized versions below.
 
 ////////////////// CONSTANTS //////////////////
 
@@ -492,12 +492,12 @@ pub fn frobenius_cube(
 
 ////////////////// CYCLOTOMIC SUBGROUP OPERATIONS //////////////////
 
-/// Since the result of the Easy Part of the Final Exponentiation belongs to the cyclotomic
-/// subgroup of Fp12, we can optimize the square and pow operations used in the Hard Part.
+// Since the result of the Easy Part of the Final Exponentiation belongs to the cyclotomic
+// subgroup of Fp12, we can optimize the square and pow operations used in the Hard Part.
 
-/// Computes the square of an element of a cyclotomic subgroup of Fp12.
-/// Algorithm from Constantine's cyclotomic_square_quad_over_cube
-/// https://github.com/mratsim/constantine/blob/master/constantine/math/pairings/cyclotomic_subgroups.nim#L354
+/// Compute the square of an element of a cyclotomic subgroup of Fp12.
+/// Algorithm from Constantine's cyclotomic_square_quad_over_cube:
+/// <https://github.com/mratsim/constantine/blob/master/constantine/math/pairings/cyclotomic_subgroups.nim#L354>
 pub fn cyclotomic_square(a: &Fp12E) -> Fp12E {
     // a = g + h * w
     let [g, h] = a.value();

math/src/unsigned_integer/element.rs

@@ -327,7 +327,6 @@ impl<const NUM_LIMBS: usize> ShrAssign<usize> for UnsignedInteger<NUM_LIMBS> {
 }
 
 /// Impl BitAnd
-
 impl<const NUM_LIMBS: usize> BitAnd for UnsignedInteger<NUM_LIMBS> {
     type Output = Self;
 
@@ -348,7 +347,6 @@ impl<const NUM_LIMBS: usize> BitAndAssign for UnsignedInteger<NUM_LIMBS> {
 }
 
 /// Impl BitOr
-
 impl<const NUM_LIMBS: usize> BitOr for UnsignedInteger<NUM_LIMBS> {
     type Output = Self;
 
@@ -370,7 +368,6 @@ impl<const NUM_LIMBS: usize> BitOrAssign for UnsignedInteger<NUM_LIMBS> {
 }
 
 /// Impl BitXor
-
 impl<const NUM_LIMBS: usize> BitXor for UnsignedInteger<NUM_LIMBS> {
     type Output = Self;