feat: Adding gcd implementation

src/tasks/mod.rs

@@ -9,8 +9,8 @@ use tasks01::{
     gfmul::gfmul_task,
     pad_oracle::padding_oracle,
     pfmath::{
-        gfdiv, gfpoly_add, gfpoly_diff, gfpoly_divmod, gfpoly_make_monic, gfpoly_mul, gfpoly_pow,
-        gfpoly_powmod, gfpoly_sort, gfpoly_sqrt,
+        gfdiv, gfpoly_add, gfpoly_diff, gfpoly_divmod, gfpoly_gcd, gfpoly_make_monic, gfpoly_mul,
+        gfpoly_pow, gfpoly_powmod, gfpoly_sort, gfpoly_sqrt,
     },
     poly2block::poly2block,
     sea128::sea128,
@@ -151,6 +151,12 @@ pub fn task_deploy(testcase: &Testcase) -> Result<Value> {
 
             Ok(json)
         }
+        "gfpoly_gcd" => {
+            let result = gfpoly_gcd(args)?;
+            let json = json!({"G" : result.to_c_array()});
+
+            Ok(json)
+        }
 
         _ => Err(anyhow!(
             "Fatal. No compatible action found. Json data was {:?}. Arguments were; {:?}",

src/tasks/tasks01/pfmath.rs

@@ -2,7 +2,10 @@ use anyhow::Result;
 use base64::{prelude::BASE64_STANDARD, Engine};
 use serde_json::Value;
 
-use crate::utils::{field::FieldElement, poly::Polynomial};
+use crate::utils::{
+    field::FieldElement,
+    poly::{gcd, Polynomial},
+};
 
 pub fn gfpoly_add(args: &Value) -> Result<Polynomial> {
     let poly_a = Polynomial::from_c_array(&args["A"].clone());
@@ -105,6 +108,15 @@ pub fn gfpoly_diff(args: &Value) -> Result<Polynomial> {
     Ok(result)
 }
 
+pub fn gfpoly_gcd(args: &Value) -> Result<Polynomial> {
+    let poly_a = Polynomial::from_c_array(&args["A"].clone());
+    let poly_b = Polynomial::from_c_array(&args["B"].clone());
+
+    let result = gcd(poly_a, poly_b);
+
+    Ok(result)
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;