diff --git a/crypto/test/src/crypto/test/ConcatenationKdfTest.cs b/crypto/test/src/crypto/test/ConcatenationKdfTest.cs
new file mode 100644
index 000000000..f095273b0
--- /dev/null
+++ b/crypto/test/src/crypto/test/ConcatenationKdfTest.cs
@@ -0,0 +1,73 @@
+using System;
+
+using NUnit.Framework;
+
+using Org.BouncyCastle.Crypto.Agreement.Kdf;
+using Org.BouncyCastle.Crypto.Digests;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.Encoders;
+
+namespace Org.BouncyCastle.Crypto.Tests
+{
+ /// <remarks>
+ /// Test vectors were copied from
+ /// https://github.com/patrickfav/singlestep-kdf/wiki/NIST-SP-800-56C-Rev1:-Non-Official-Test-Vectors
+ /// </remarks>
+ [TestFixture]
+ public class ConcatenationKdfTest
+ {
+ [Test]
+ public void TestSha1()
+ {
+ string sharedSecret = "ebe28edbae5a410b87a479243db3f690";
+ string otherInfo = "e60dd8b28228ce5b9be74d3b";
+ string expected = "b4a23963e07f485382cb358a493daec1759ac7043dbeac37152c6ddf105031f0f239f270b7f30616166f10e5d2b4cb11ba8bf4ba3f2276885abfbc3e811a568d480d9192";
+
+ ImplKdfTest(new Sha1Digest(), sharedSecret, otherInfo, expected);
+ }
+
+ [Test]
+ public void TestSha256()
+ {
+ string sharedSecret = "3f892bd8b84dae64a782a35f6eaa8f00";
+ string otherInfo = "ec3f1cd873d28858a58cc39e";
+ string expected = "a7c0665298252531e0db37737a374651b368275f2048284d16a166c6d8a90a91a491c16f49641b9f516a03d9d6d0f4fe7b81ffdf1c816f40ecd74aed8eda2b8a3c714fa0";
+
+ ImplKdfTest(new Sha256Digest(), sharedSecret, otherInfo, expected);
+ }
+
+ [Test]
+ public void TestSha512()
+ {
+ string sharedSecret = "e65b1905878b95f68b5535bd3b2b1013";
+ string otherInfo = "830221b1730d9176f807d407";
+ string expected = "b8c44bdf0b85a64b6a51c12a06710e373d829bb1fda5b4e1a20795c6199594f6fa65198a721257f7d58cb2f6f6db9bb5699f73863045909054b2389e06ec00fe318cabd9";
+
+ ImplKdfTest(new Sha512Digest(), sharedSecret, otherInfo, expected);
+ }
+
+ private void ImplKdfTest(IDigest digest, string sharedSecret, string otherInfo, string expected)
+ {
+ byte[] sharedSecretBytes = Hex.DecodeStrict(sharedSecret);
+ byte[] otherInfoBytes = Hex.DecodeStrict(otherInfo);
+ byte[] expectedBytes = Hex.DecodeStrict(expected);
+ byte[] output = new byte[15 + expectedBytes.Length];
+
+ Random random = new Random();
+ ConcatenationKdfGenerator kdf = new ConcatenationKdfGenerator(digest);
+
+ for (int count = 0; count <= expectedBytes.Length; ++count)
+ {
+ Arrays.Fill(output, 0);
+ int outputPos = random.Next(16);
+
+ kdf.Init(new KdfParameters(sharedSecretBytes, otherInfoBytes));
+ kdf.GenerateBytes(output, outputPos, count);
+
+ Assert.IsTrue(Arrays.AreEqual(expectedBytes, 0, count, output, outputPos, outputPos + count),
+ "ConcatenationKDF (" + digest.AlgorithmName + ") failed for count of " + count);
+ }
+ }
+ }
+}
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