apply nightly clippy fixes: const div_ceil (2025-05-12) (#968)

Author: dishmaker

slh-dsa/src/hashes/sha2.rs

@@ -166,7 +166,7 @@ impl HypertreeParams for Sha2_128s {
 impl ForsParams for Sha2_128s {
     type K = U<14>;
     type A = U<12>;
-    type MD = U<{ (12 * 14 + 7) / 8 }>;
+    type MD = U<{ (12 * 14usize).div_ceil(8) }>;
 }
 impl ParameterSet for Sha2_128s {
     const NAME: &'static str = "SLH-DSA-SHA2-128s";
@@ -329,7 +329,7 @@ impl HypertreeParams for Sha2_192s {
 impl ForsParams for Sha2_192s {
     type K = U<17>;
     type A = U<14>;
-    type MD = U<{ (14 * 17 + 7) / 8 }>;
+    type MD = U<{ (14 * 17usize).div_ceil(8) }>;
 }
 impl ParameterSet for Sha2_192s {
     const NAME: &'static str = "SLH-DSA-SHA2-192s";
@@ -352,7 +352,7 @@ impl HypertreeParams for Sha2_192f {
 impl ForsParams for Sha2_192f {
     type K = U<33>;
     type A = U<8>;
-    type MD = U<{ (33 * 8 + 7) / 8 }>;
+    type MD = U<{ (33 * 8usize).div_ceil(8) }>;
 }
 impl ParameterSet for Sha2_192f {
     const NAME: &'static str = "SLH-DSA-SHA2-192f";
@@ -375,7 +375,7 @@ impl HypertreeParams for Sha2_256s {
 impl ForsParams for Sha2_256s {
     type K = U<22>;
     type A = U<14>;
-    type MD = U<{ (14 * 22 + 7) / 8 }>;
+    type MD = U<{ (14 * 22usize).div_ceil(8) }>;
 }
 impl ParameterSet for Sha2_256s {
     const NAME: &'static str = "SLH-DSA-SHA2-256s";
@@ -398,7 +398,7 @@ impl HypertreeParams for Sha2_256f {
 impl ForsParams for Sha2_256f {
     type K = U<35>;
     type A = U<9>;
-    type MD = U<{ (35 * 9 + 7) / 8 }>;
+    type MD = U<{ (35 * 9usize).div_ceil(8) }>;
 }
 impl ParameterSet for Sha2_256f {
     const NAME: &'static str = "SLH-DSA-SHA2-256f";

slh-dsa/src/hashes/shake.rs

@@ -143,7 +143,7 @@ impl HypertreeParams for Shake128s {
 impl ForsParams for Shake128s {
     type K = U<14>;
     type A = U<12>;
-    type MD = U<{ (12 * 14 + 7) / 8 }>;
+    type MD = U<{ (12 * 14usize).div_ceil(8) }>;
 }
 impl ParameterSet for Shake128s {
     const NAME: &'static str = "SLH-DSA-SHAKE-128s";
@@ -189,7 +189,7 @@ impl HypertreeParams for Shake192s {
 impl ForsParams for Shake192s {
     type K = U<17>;
     type A = U<14>;
-    type MD = U<{ (14 * 17 + 7) / 8 }>;
+    type MD = U<{ (14 * 17usize).div_ceil(8) }>;
 }
 impl ParameterSet for Shake192s {
     const NAME: &'static str = "SLH-DSA-SHAKE-192s";
@@ -212,7 +212,7 @@ impl HypertreeParams for Shake192f {
 impl ForsParams for Shake192f {
     type K = U<33>;
     type A = U<8>;
-    type MD = U<{ (33 * 8 + 7) / 8 }>;
+    type MD = U<{ (33 * 8usize).div_ceil(8) }>;
 }
 impl ParameterSet for Shake192f {
     const NAME: &'static str = "SLH-DSA-SHAKE-192f";
@@ -235,7 +235,7 @@ impl HypertreeParams for Shake256s {
 impl ForsParams for Shake256s {
     type K = U<22>;
     type A = U<14>;
-    type MD = U<{ (14 * 22 + 7) / 8 }>;
+    type MD = U<{ (14 * 22usize).div_ceil(8) }>;
 }
 impl ParameterSet for Shake256s {
     const NAME: &'static str = "SLH-DSA-SHAKE-256s";
@@ -258,7 +258,7 @@ impl HypertreeParams for Shake256f {
 impl ForsParams for Shake256f {
     type K = U<35>;
     type A = U<9>;
-    type MD = U<{ (35 * 9 + 7) / 8 }>;
+    type MD = U<{ (35 * 9usize).div_ceil(8) }>;
 }
 impl ParameterSet for Shake256f {
     const NAME: &'static str = "SLH-DSA-SHAKE-256f";

slh-dsa/src/util.rs

@@ -3,7 +3,7 @@ use hybrid_array::{Array, ArraySize, typenum::Unsigned};
 
 // Algorithm 3
 pub fn base_2b<OutLen: ArraySize, B: Unsigned>(x: &[u8]) -> Array<u16, OutLen> {
-    debug_assert!(x.len() >= (OutLen::USIZE * B::USIZE + 7) / 8);
+    debug_assert!(x.len() >= (OutLen::USIZE * B::USIZE).div_ceil(8));
     debug_assert!(B::USIZE <= 16);
 
     let mut bits = 0usize;