diff --git a/IRDKit/IRDKit.csproj b/IRDKit/IRDKit.csproj
index a2d15f2..186cf7b 100644
--- a/IRDKit/IRDKit.csproj
+++ b/IRDKit/IRDKit.csproj
@@ -5,7 +5,7 @@
     <OutputType>Exe</OutputType>
     <TargetName>irdkit</TargetName>
     <AssemblyName>irdkit</AssemblyName>
-    <TargetFrameworks>net40;net452;net462;net472;net48;netcoreapp3.1;net5.0;net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net462;net472;net48;netcoreapp3.1;net5.0;net6.0;net7.0;net8.0</TargetFrameworks>
     <RuntimeIdentifiers>win-x86;win-x64;win-arm64;linux-x64;linux-arm64;osx-x64;osx-arm64</RuntimeIdentifiers>
 	<CheckEolTargetFramework>false</CheckEolTargetFramework>
     <LangVersion>latest</LangVersion>
@@ -30,7 +30,7 @@
 
   <ItemGroup>
     <PackageReference Include="CommandLineParser" Version="2.9.1" />
-    <PackageReference Include="SabreTools.Hashing" Version="1.1.2" />
+    <PackageReference Include="SabreTools.Hashing" Version="1.1.3" />
     <PackageReference Include="SabreTools.RedumpLib" Version="1.3.4" />
   </ItemGroup>
 
diff --git a/IRDKit/Program.cs b/IRDKit/Program.cs
index 8cf8841..af415db 100644
--- a/IRDKit/Program.cs
+++ b/IRDKit/Program.cs
@@ -933,8 +933,12 @@ namespace IRDKit
                 Console.WriteLine("No key provided... Searching for key on redump.org");
 
             // Compute CRC32 hash
-            string crc32String = HashTool.GetFileHash(isoPath, HashType.CRC32); // TODO: Output byte[] once ST.Hashing supports it
-            uint crc32UInt = BitConverter.ToUInt32(LibIRD.IRD.HexStringToByteArray(crc32String), 0);
+            byte[] crc32 = HashTool.GetFileHashArray(isoPath, HashType.CRC32);
+            string crc32String = LibIRD.IRD.ByteArrayToHexString(crc32).ToLowerInvariant();
+
+            // Convert to UInt for use as UID in IRD
+            Array.Reverse(crc32);
+            uint crc32UInt = BitConverter.ToUInt32(crc32, 0);
 
             // Search for ISO on redump.org
 #if !NETFRAMEWORK
diff --git a/LibIRD/IRD.cs b/LibIRD/IRD.cs
index 9f968a6..b333b68 100644
--- a/LibIRD/IRD.cs
+++ b/LibIRD/IRD.cs
@@ -804,11 +804,11 @@ namespace LibIRD
             // Begin a GZip stream to write header to
             using MemoryStream headerStream = new();
 #if NET6_0_OR_GREATER
-            using GZipStream gzStream = new(headerStream, CompressionLevel.SmallestSize);
+            using (GZipStream gzStream = new(headerStream, CompressionLevel.SmallestSize))
 #elif NETCOREAPP || NET45_OR_GREATER
-            using GZipStream gzStream = new(headerStream, CompressionLevel.Optimal);
+            using (GZipStream gzStream = new(headerStream, CompressionLevel.Optimal))
 #else
-            using GZipStream gzStream = new(headerStream, CompressionMode.Compress);
+            using (GZipStream gzStream = new(headerStream, CompressionMode.Compress))
 #endif
             {
                 // Start reading data from the beginning of the ISO file
@@ -838,11 +838,11 @@ namespace LibIRD
             // Begin a GZip stream to write footer to
             using MemoryStream footerStream = new();
 #if NET6_0_OR_GREATER
-            using GZipStream gzStream = new(footerStream, CompressionLevel.SmallestSize);
+            using (GZipStream gzStream = new(footerStream, CompressionLevel.SmallestSize))
 #elif NETCOREAPP || NET45_OR_GREATER
-            using GZipStream gzStream = new(footerStream, CompressionLevel.Optimal);
+            using (GZipStream gzStream = new(footerStream, CompressionLevel.Optimal))
 #else
-            using GZipStream gzStream = new(footerStream, CompressionMode.Compress);
+            using (GZipStream gzStream = new(footerStream, CompressionMode.Compress))
 #endif
             {
                 // Start reading data from after last file (PS3UPDAT.PUP)
@@ -1084,6 +1084,7 @@ namespace LibIRD
                     if (redump)
                     {
                         crc32 = isoHasher.CurrentHashBytes;
+                        Array.Reverse(crc32);
                         UID = BitConverter.ToUInt32(crc32, 0);
                     }
                     return;
@@ -1340,8 +1341,8 @@ namespace LibIRD
 
             // Calculate the little-endian 32-bit "IEEE 802.3" CRC value of the IRD contents so far
             stream.Position = 0;
-            string crc32String = HashTool.GetStreamHash(stream, HashType.CRC32);
-            byte[] crc32 = HexStringToByteArray(crc32String);
+            byte[] crc32 = HashTool.GetStreamHashArray(stream, HashType.CRC32, true);
+            Array.Reverse(crc32);
 
             // Write final CRC value to the stream
             stream.Write(crc32, 0, 4);
diff --git a/LibIRD/LibIRD.csproj b/LibIRD/LibIRD.csproj
index 27ade3a..3f8c772 100644
--- a/LibIRD/LibIRD.csproj
+++ b/LibIRD/LibIRD.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <!-- Assembly Properties -->
-    <TargetFrameworks>net40;net452;net462;net472;net48;netcoreapp3.1;net5.0;net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net462;net472;net48;netcoreapp3.1;net5.0;net6.0;net7.0;net8.0</TargetFrameworks>
     <RuntimeIdentifiers>win-x86;win-x64;win-arm64;linux-x64;linux-arm64;osx-x64;osx-arm64</RuntimeIdentifiers>
 	<CheckEolTargetFramework>false</CheckEolTargetFramework>
     <LangVersion>latest</LangVersion>
@@ -29,7 +29,7 @@
   
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageReference Include="SabreTools.Hashing" Version="1.1.2" />
+    <PackageReference Include="SabreTools.Hashing" Version="1.1.3" />
   </ItemGroup>
   
   <ItemGroup Condition="$(TargetFramework.StartsWith(`netcoreapp3`)) OR $(TargetFramework.StartsWith(`net5`))">