Add evaluate_polynomial_in_evaluation_form to C#

min-bindings/C#/ckzg.c

@@ -33,6 +33,30 @@ KZGSettings* load_trusted_setup_wrap(const char* file) {
   return out;
 }
 
+int evaluate_polynomial_wrap(uint8_t out[32], const uint8_t pvals[], size_t n, const uint8_t point[32], const KZGSettings *s) {
+  PolynomialEvalForm p;
+
+  if (alloc_polynomial(&p, n) != C_KZG_OK)
+    return -1;
+
+  for (size_t i = 0; i < n; i++)
+    bytes_to_bls_field(&p.values[i], &pvals[i * 32]);
+
+  BLSFieldElement z;
+  bytes_to_bls_field(&z, point);
+
+  BLSFieldElement r;
+
+  if (evaluate_polynomial_in_evaluation_form(&r, &p, &z, s) != C_KZG_OK) {
+    free_polynomial(&p);
+    return -1;
+  }
+
+  bytes_from_bls_field(out, &r);
+
+  return 0;
+}
+
 void free_trusted_setup_wrap(KZGSettings* s) {
   free_trusted_setup(s);
   free(s);

min-bindings/C#/tests.cs

@@ -10,6 +10,9 @@ class ckzg {
   [DllImport("ckzg.dll", EntryPoint="verify_kzg_proof_wrap")]
   public static extern int verify_kzg_proof(byte[] c, byte[] x, byte[] y, byte[] p, IntPtr ts);
 
+  [DllImport("ckzg.dll", EntryPoint="evaluate_polynomial_wrap")]
+  public static extern int evaluate_polynomial_in_evaluation_form(byte[] result, byte[] p, byte[] z, IntPtr ts);
+
   [DllImport("ckzg.dll", EntryPoint="load_trusted_setup_wrap")]
   public static extern IntPtr load_trusted_setup(string filename);
 
@@ -51,11 +54,10 @@ class tests {
 
   private static void Main(string[] args)
   {
+    Console.WriteLine("Test 1: verify_kzg_proof");
+
     IntPtr ts = ckzg.load_trusted_setup("../../src/trusted_setup.txt");
-    if (ts == IntPtr.Zero) {
+    System.Diagnostics.Trace.Assert(ts != IntPtr.Zero, "Failed to load trusted setup.");
-      Console.WriteLine("Failed to load trusted setup.");
-      return;
-    }
 
     byte[] c = HexadecimalStringToByteArray("b91c022acf7bd3b63be69a4c19b781ea7a3d5df1cd66ceb7dd0f399610f0ee04695dace82e04bfb83af2b17d7319f87f");
     byte[] x = HexadecimalStringToByteArray("0345f802a75a6c0d9cc5b8a1e71642b8fa80b0a78938edc6da1e591149578d1a");
@@ -70,6 +72,19 @@ class tests {
 
     ckzg.free_trusted_setup(ts);
 
+    Console.WriteLine("Test 2: evaluate_polynomial_in_evaluation_form");
+
+    ts = ckzg.load_trusted_setup("../python/tiny_trusted_setup.txt");
+    System.Diagnostics.Trace.Assert(ts != IntPtr.Zero, "Failed to load trusted setup.");
+
+    p = HexadecimalStringToByteArray("10000000000000000d00000000000000000000000000000000000000000000000a000000000000000d00000000000000000000000000000000000000000000000b000000000001000d000376020003ecd0040376cecc518d00000000000000000c000000fffffeff0b5cfb8900a4ba6734d39e93390be8a5477d9d2953a7ed73");
+    x = HexadecimalStringToByteArray("0200000000000000000000000000000000000000000000000000000000000000");
+    result = ckzg.evaluate_polynomial_in_evaluation_form(y, p, x, ts);
+    System.Diagnostics.Trace.Assert(result == 0, "Evaluation failed");
+    System.Diagnostics.Trace.Assert(y == HexadecimalStringToByteArray("1c000000000000000d0000000000000000000000000000000000000000000000"),
+        "Evaluation produced incorrect value");
+    ckzg.free_trusted_setup(ts);
+
     Console.WriteLine("Tests passed");
   }
 }