feat: add function for polynomial differentiation

src/tasks/mod.rs

@@ -9,8 +9,8 @@ use tasks01::{
     gfmul::gfmul_task,
     pad_oracle::padding_oracle,
     pfmath::{
-        gfdiv, gfpoly_add, gfpoly_divmod, gfpoly_make_monic, gfpoly_mul, gfpoly_pow, gfpoly_powmod,
-        gfpoly_sort, gfpoly_sqrt,
+        gfdiv, gfpoly_add, gfpoly_diff, gfpoly_divmod, gfpoly_make_monic, gfpoly_mul, gfpoly_pow,
+        gfpoly_powmod, gfpoly_sort, gfpoly_sqrt,
     },
     poly2block::poly2block,
     sea128::sea128,
@@ -145,6 +145,12 @@ pub fn task_deploy(testcase: &Testcase) -> Result<Value> {
 
             Ok(json)
         }
+        "gfpoly_diff" => {
+            let result = gfpoly_diff(args)?;
+            let json = json!({"F'" : result.to_c_array()});
+
+            Ok(json)
+        }
 
         _ => Err(anyhow!(
             "Fatal. No compatible action found. Json data was {:?}. Arguments were; {:?}",

src/tasks/tasks01/pfmath.rs

@@ -97,6 +97,14 @@ pub fn gfpoly_sqrt(args: &Value) -> Result<Polynomial> {
     Ok(result)
 }
 
+pub fn gfpoly_diff(args: &Value) -> Result<Polynomial> {
+    let poly_f = Polynomial::from_c_array(&args["F"].clone());
+
+    let result = poly_f.diff();
+
+    Ok(result)
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;