diff --git a/src/Registry/HashingAlgorithm.cs b/src/Registry/HashingAlgorithm.cs
index 3e3be63..efb5d45 100644
--- a/src/Registry/HashingAlgorithm.cs
+++ b/src/Registry/HashingAlgorithm.cs
@@ -56,6 +56,8 @@ static HashingAlgorithm()
             Register("blake2s-256", 0xb260, 256 / 8, () => new BouncyDigest(new BC.Blake2sDigest(256)));
             Register("murmur3-32", 0x23, 32 / 8);
             Register("murmur3-128", 0x22, 128 / 8);
+            Register("md4", 0xd4, 128 / 8, () => new BouncyDigest(new BC.MD4Digest()));
+            Register("md5", 0xd5, 128 / 8, () => MD5.Create());
         }
 
         /// <summary>
diff --git a/test/Cryptography/HashingTest.cs b/test/Cryptography/HashingTest.cs
index 2aedb06..5c08af4 100644
--- a/test/Cryptography/HashingTest.cs
+++ b/test/Cryptography/HashingTest.cs
@@ -75,6 +75,22 @@ class TestVector
                 Input = "fd6dd3b63dc7b9664895c51fc17c57d59c349621dd3c5694a3cc404c660c2cc47d83d2f0e3d2a28a3aa2f0a710db54",
                 Digest = "c8db32bf81bf75621db30264750954f8"
             },
+
+            // From https://en.wikipedia.org/wiki/MD4
+            new TestVector
+            {
+                Algorithm = "md4",
+                Input = Encoding.UTF8.GetBytes("The quick brown fox jumps over the lazy dog").ToHexString(),
+                Digest = "1bee69a46ba811185c194762abaeae90",
+            },
+
+            // From https://en.wikipedia.org/wiki/MD5
+            new TestVector
+            {
+                Algorithm = "md5",
+                Input = Encoding.UTF8.GetBytes("The quick brown fox jumps over the lazy dog").ToHexString(),
+                Digest = "9e107d9d372bb6826bd81d3542a419d6",
+            },
         };
 
         /// <summary>