diff --git a/aws-crt-checksums/Crc.cs b/aws-crt-checksums/Crc.cs
index f1639bc..d5b7378 100644
--- a/aws-crt-checksums/Crc.cs
+++ b/aws-crt-checksums/Crc.cs
@@ -18,9 +18,14 @@ public delegate UInt32 aws_dotnet_crc32([In, MarshalAs(UnmanagedType.LPArray, Si
             [UnmanagedFunctionPointerAttribute(CallingConvention.Cdecl)]
             public delegate UInt32 aws_dotnet_crc32c([In, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2, ArraySubType = UnmanagedType.U1)] byte[] buffer,
                                                    Int32 length, UInt32 previous);
+            
+            [UnmanagedFunctionPointerAttribute(CallingConvention.Cdecl)]
+            public delegate UInt64 aws_dotnet_crc64nvme([In, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2, ArraySubType = UnmanagedType.U1)] byte[] buffer,
+                                                   Int32 length, UInt64 previous);
 
             public static aws_dotnet_crc32 crc32 = NativeAPI.Bind<aws_dotnet_crc32>();
             public static aws_dotnet_crc32c crc32c = NativeAPI.Bind<aws_dotnet_crc32c>();
+            public static aws_dotnet_crc64nvme crc64nvme = NativeAPI.Bind<aws_dotnet_crc64nvme>();
         }
         public static uint crc32(byte[] buffer, uint previous = 0)
         {
@@ -30,5 +35,9 @@ public static uint crc32c(byte[] buffer, uint previous = 0)
         {
             return API.crc32c(buffer, buffer.Length, previous);
         }
+        public static ulong crc64nvme(byte[] buffer, ulong previous = 0)
+        {
+            return API.crc64nvme(buffer, buffer.Length, previous);
+        }
     }
 }
diff --git a/crt/aws-checksums b/crt/aws-checksums
index aac442a..ce04ab0 160000
--- a/crt/aws-checksums
+++ b/crt/aws-checksums
@@ -1 +1 @@
-Subproject commit aac442a2dbbb5e72d0a3eca8313cf65e7e1cac2f
+Subproject commit ce04ab00b3ecc41912f478bfedca39f8e1919d6b
diff --git a/native/src/crc.c b/native/src/crc.c
index 83aa151..5c5d50c 100644
--- a/native/src/crc.c
+++ b/native/src/crc.c
@@ -9,10 +9,15 @@
 
 AWS_DOTNET_API
 uint32_t aws_dotnet_crc32(const uint8_t *input, int length, uint32_t previous) {
-    return aws_checksums_crc32(input, length, previous);
+    return aws_checksums_crc32_ex(input, (size_t)length, previous);
 }
 
 AWS_DOTNET_API
 uint32_t aws_dotnet_crc32c(const uint8_t *input, int length, uint32_t previous) {
-    return aws_checksums_crc32c(input, length, previous);
+    return aws_checksums_crc32c_ex(input, (size_t)length, previous);
+}
+
+AWS_DOTNET_API
+uint64_t aws_dotnet_crc64nvme(const uint8_t *input, int length, uint64_t previous) {
+    return aws_checksums_crc64nvme_ex(input, (size_t)length, previous);
 }
diff --git a/tests/CrcTest.cs b/tests/CrcTest.cs
index 1224abc..1026faf 100644
--- a/tests/CrcTest.cs
+++ b/tests/CrcTest.cs
@@ -107,5 +107,23 @@ public void TestCrc32cLargeBuffer()
             uint expected = 0xfb5b991d;
             Assert.Equal(expected, res);
         }
+        [Fact]
+        public void TestCrc64NVMEZeroes()
+        {
+            byte[] zeroes = new byte[32];
+            ulong res = Crc.crc64nvme(zeroes);
+            ulong expected = 0xCF3473434D4ECF3B;
+            Assert.Equal(expected, res);
+        }
+        [Fact]
+        public void TestCrc64NVMEZeroesIterated()
+        {
+            ulong res = 0;
+            for (int i = 0; i < 32; i++) {
+                res = Crc.crc64nvme(new byte[1], res);
+            }
+            ulong expected = 0xCF3473434D4ECF3B;
+            Assert.Equal(expected, res);
+        }
     }
 }