diff --git a/Adler32Context.cs b/Adler32Context.cs
index 0e58f602c..e46a491a1 100644
--- a/Adler32Context.cs
+++ b/Adler32Context.cs
@@ -33,6 +33,7 @@
 using System;
 using System.IO;
 using System.Text;
+using DiscImageChef.CommonTypes.Interfaces;
 
 namespace DiscImageChef.Checksums
 {
diff --git a/CRC16Context.cs b/CRC16Context.cs
index 858e03eb9..7eacbe941 100644
--- a/CRC16Context.cs
+++ b/CRC16Context.cs
@@ -33,6 +33,7 @@
 using System;
 using System.IO;
 using System.Text;
+using DiscImageChef.CommonTypes.Interfaces;
 
 namespace DiscImageChef.Checksums
 {
diff --git a/CRC32Context.cs b/CRC32Context.cs
index 8bf6157f3..6caab3f64 100644
--- a/CRC32Context.cs
+++ b/CRC32Context.cs
@@ -33,6 +33,7 @@
 using System;
 using System.IO;
 using System.Text;
+using DiscImageChef.CommonTypes.Interfaces;
 
 namespace DiscImageChef.Checksums
 {
diff --git a/CRC64Context.cs b/CRC64Context.cs
index 15b73a5f5..3dcd379b8 100644
--- a/CRC64Context.cs
+++ b/CRC64Context.cs
@@ -33,6 +33,7 @@
 using System;
 using System.IO;
 using System.Text;
+using DiscImageChef.CommonTypes.Interfaces;
 
 namespace DiscImageChef.Checksums
 {
diff --git a/DiscImageChef.Checksums.csproj b/DiscImageChef.Checksums.csproj
index 65666d838..0f1368e41 100644
--- a/DiscImageChef.Checksums.csproj
+++ b/DiscImageChef.Checksums.csproj
@@ -12,7 +12,7 @@
     <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
     <TargetFramework>net461</TargetFramework>
     <GenerateAssemblyInfo>true</GenerateAssemblyInfo>
-    <Version>4.5.1.1692</Version>
+    <Version>4.5.99.1693</Version>
     <Company>Claunia.com</Company>
     <Copyright>Copyright © 2011-2018 Natalia Portillo</Copyright>
     <Product>The Disc Image Chef</Product>
@@ -46,7 +46,6 @@
     <Reference Include="System" />
   </ItemGroup>
   <ItemGroup>
-    <Compile Include="IChecksum.cs" />
     <Compile Include="SpamSumContext.cs" />
     <Compile Include="Adler32Context.cs" />
     <Compile Include="CDChecksums.cs" />
@@ -63,6 +62,7 @@
     <Compile Include="SHA512Context.cs" />
   </ItemGroup>
   <ItemGroup>
+    <ProjectReference Include="..\DiscImageChef.CommonTypes\DiscImageChef.CommonTypes.csproj" />
     <ProjectReference Include="..\DiscImageChef.Helpers\DiscImageChef.Helpers.csproj">
       <Project>{F8BDF57B-1571-4CD0-84B3-B422088D359A}</Project>
       <Name>DiscImageChef.Helpers</Name>
diff --git a/FletcherContext.cs b/FletcherContext.cs
index d89477829..1366a1e23 100644
--- a/FletcherContext.cs
+++ b/FletcherContext.cs
@@ -35,6 +35,7 @@
 using System;
 using System.IO;
 using System.Text;
+using DiscImageChef.CommonTypes.Interfaces;
 
 namespace DiscImageChef.Checksums
 {
diff --git a/IChecksum.cs b/IChecksum.cs
deleted file mode 100644
index 862bbd89f..000000000
--- a/IChecksum.cs
+++ /dev/null
@@ -1,60 +0,0 @@
-// /***************************************************************************
-// The Disc Image Chef
-// ----------------------------------------------------------------------------
-//
-// Filename       : IChecksum.cs
-// Author(s)      : Natalia Portillo <claunia@claunia.com>
-//
-// Component      : Checksums.
-//
-// --[ Description ] ----------------------------------------------------------
-//
-//     Provides an interface for implementing checksums and hashes.
-//
-// --[ License ] --------------------------------------------------------------
-//
-//     This library is free software; you can redistribute it and/or modify
-//     it under the terms of the GNU Lesser General Public License as
-//     published by the Free Software Foundation; either version 2.1 of the
-//     License, or (at your option) any later version.
-//
-//     This library is distributed in the hope that it will be useful, but
-//     WITHOUT ANY WARRANTY; without even the implied warranty of
-//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-//     Lesser General Public License for more details.
-//
-//     You should have received a copy of the GNU Lesser General Public
-//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
-//
-// ----------------------------------------------------------------------------
-// Copyright © 2011-2018 Natalia Portillo
-// ****************************************************************************/
-
-namespace DiscImageChef.Checksums
-{
-    public interface IChecksum
-    {
-        /// <summary>
-        ///     Updates the hash with data.
-        /// </summary>
-        /// <param name="data">Data buffer.</param>
-        /// <param name="len">Length of buffer to hash.</param>
-        void Update(byte[] data, uint len);
-
-        /// <summary>
-        ///     Updates the hash with data.
-        /// </summary>
-        /// <param name="data">Data buffer.</param>
-        void Update(byte[] data);
-
-        /// <summary>
-        ///     Returns a byte array of the hash value.
-        /// </summary>
-        byte[] Final();
-
-        /// <summary>
-        ///     Returns a hexadecimal representation of the hash value.
-        /// </summary>
-        string End();
-    }
-}
\ No newline at end of file
diff --git a/MD5Context.cs b/MD5Context.cs
index ca48fa3d7..2f1b3ac60 100644
--- a/MD5Context.cs
+++ b/MD5Context.cs
@@ -33,6 +33,7 @@
 using System.IO;
 using System.Security.Cryptography;
 using System.Text;
+using DiscImageChef.CommonTypes.Interfaces;
 
 namespace DiscImageChef.Checksums
 {
diff --git a/RIPEMD160Context.cs b/RIPEMD160Context.cs
index 55d668228..a77300dab 100644
--- a/RIPEMD160Context.cs
+++ b/RIPEMD160Context.cs
@@ -33,6 +33,7 @@
 using System.IO;
 using System.Security.Cryptography;
 using System.Text;
+using DiscImageChef.CommonTypes.Interfaces;
 
 namespace DiscImageChef.Checksums
 {
diff --git a/SHA1Context.cs b/SHA1Context.cs
index f56d0d7cc..d9c363469 100644
--- a/SHA1Context.cs
+++ b/SHA1Context.cs
@@ -33,6 +33,7 @@
 using System.IO;
 using System.Security.Cryptography;
 using System.Text;
+using DiscImageChef.CommonTypes.Interfaces;
 
 namespace DiscImageChef.Checksums
 {
diff --git a/SHA256Context.cs b/SHA256Context.cs
index dc2d3e0ae..001784432 100644
--- a/SHA256Context.cs
+++ b/SHA256Context.cs
@@ -33,6 +33,7 @@
 using System.IO;
 using System.Security.Cryptography;
 using System.Text;
+using DiscImageChef.CommonTypes.Interfaces;
 
 namespace DiscImageChef.Checksums
 {
diff --git a/SHA384Context.cs b/SHA384Context.cs
index b3b75c6a3..36b1e5b8a 100644
--- a/SHA384Context.cs
+++ b/SHA384Context.cs
@@ -33,6 +33,7 @@
 using System.IO;
 using System.Security.Cryptography;
 using System.Text;
+using DiscImageChef.CommonTypes.Interfaces;
 
 namespace DiscImageChef.Checksums
 {
diff --git a/SHA512Context.cs b/SHA512Context.cs
index 3769a7977..1dafecdd4 100644
--- a/SHA512Context.cs
+++ b/SHA512Context.cs
@@ -33,6 +33,7 @@
 using System.IO;
 using System.Security.Cryptography;
 using System.Text;
+using DiscImageChef.CommonTypes.Interfaces;
 
 namespace DiscImageChef.Checksums
 {
diff --git a/SpamSumContext.cs b/SpamSumContext.cs
index c38cc2318..6fea5add2 100644
--- a/SpamSumContext.cs
+++ b/SpamSumContext.cs
@@ -41,6 +41,7 @@
 
 using System;
 using System.Text;
+using DiscImageChef.CommonTypes.Interfaces;
 
 namespace DiscImageChef.Checksums
 {