From cffddc331374f3915e70b738dbef4cb2f505581e Mon Sep 17 00:00:00 2001
From: John Steel <git@jskw.dev>
Date: Sat, 17 Oct 2020 11:14:15 -0400
Subject: Test Vectors for EC Point Multiply

Test multiply with the test vectors downloaded from:
http://point-at-infinity.org/ecc/nisttv
---
 crypto/test/src/crypto/test/NistEccTest.cs | 72 ++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 crypto/test/src/crypto/test/NistEccTest.cs

(limited to 'crypto/test/src')

diff --git a/crypto/test/src/crypto/test/NistEccTest.cs b/crypto/test/src/crypto/test/NistEccTest.cs
new file mode 100644
index 000000000..7e658ff3e
--- /dev/null
+++ b/crypto/test/src/crypto/test/NistEccTest.cs
@@ -0,0 +1,72 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Text.RegularExpressions;
+using NUnit.Framework;
+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Utilities.Test;
+
+namespace Org.BouncyCastle.Crypto.Tests
+{
+    public class NistEccTest
+    {
+        public IEnumerable<object[]> CollectTestVectors()
+        {
+            string curve = null;
+            BigInteger k = null;
+            BigInteger x = null;
+            BigInteger y = null;
+
+            using (StreamReader r = new StreamReader(SimpleTest.GetTestDataAsStream("crypto.nist_ecc.txt")))
+            {
+                string line;
+                while (null != (line = r.ReadLine()))
+                {
+                    var capture = new Regex(@"^ ?(\w+):? =? ?(\w+)", RegexOptions.Compiled);
+                    var data = capture.Match(line);
+
+                    if (!data.Success) continue;
+                    var nistKey = data.Groups[1].Value;
+                    var nistValue = data.Groups[2].Value;
+                    switch (nistKey)
+                    {
+                        case "Curve":
+                            // Change curve name from LNNN to L-NNN ie: P256 to P-256
+                            curve = $"{nistValue.Substring(0, 1)}-{nistValue.Substring(1)}";
+                            break;
+                        case "k":
+                            k = new BigInteger(nistValue, 10);
+                            break;
+                        case "x":
+                            x = new BigInteger(nistValue, radix: 16);
+                            break;
+                        case "y":
+                            y = new BigInteger(nistValue, radix: 16);
+                            break;
+                    }
+
+                    if (null != curve && null != k && null != x && null != y)
+                    {
+                        yield return new object[] {curve, k, x, y};
+                        k = null;
+                        x = null;
+                        y = null;
+                    }
+                }
+            }
+        }
+
+        [TestCaseSource(nameof(CollectTestVectors))]
+        public void TestMultiply(string curve, BigInteger k, BigInteger expectedX, BigInteger expectedY)
+        {
+            // Arrange
+            var x9EcParameters = Asn1.Nist.NistNamedCurves.GetByName(curve);
+
+            // Act
+            var ecPoint = x9EcParameters.G.Multiply(k).Normalize();
+
+            // Assert
+            Assert.AreEqual(expectedX, ecPoint.XCoord.ToBigInteger(), "Unexpected X Coordinate");
+            Assert.AreEqual(expectedY, ecPoint.YCoord.ToBigInteger(), "Unexpected Y Coordinate");
+        }
+    }
+}
\ No newline at end of file
-- 
cgit 1.5.1