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-rw-r--r--crypto/src/util/BigIntegers.cs2
-rw-r--r--crypto/src/util/Bytes.cs2
-rw-r--r--crypto/src/util/Integers.cs13
-rw-r--r--crypto/src/util/Longs.cs13
-rw-r--r--crypto/src/util/Platform.cs2
-rw-r--r--crypto/src/util/Strings.cs2
-rw-r--r--crypto/src/util/io/Streams.cs6
7 files changed, 29 insertions, 11 deletions
diff --git a/crypto/src/util/BigIntegers.cs b/crypto/src/util/BigIntegers.cs
index 93dc8e8eb..e63af7c7c 100644
--- a/crypto/src/util/BigIntegers.cs
+++ b/crypto/src/util/BigIntegers.cs
@@ -9,7 +9,7 @@ namespace Org.BouncyCastle.Utilities
     /**
      * BigInteger utilities.
      */
-    public abstract class BigIntegers
+    public static class BigIntegers
     {
         public static readonly BigInteger Zero = BigInteger.Zero;
         public static readonly BigInteger One = BigInteger.One;
diff --git a/crypto/src/util/Bytes.cs b/crypto/src/util/Bytes.cs
index ecde85dde..466eba576 100644
--- a/crypto/src/util/Bytes.cs
+++ b/crypto/src/util/Bytes.cs
@@ -2,7 +2,7 @@
 
 namespace Org.BouncyCastle.Utilities
 {
-    public abstract class Bytes
+    public static class Bytes
     {
         public const int NumBits = 8;
         public const int NumBytes = 1;
diff --git a/crypto/src/util/Integers.cs b/crypto/src/util/Integers.cs
index 75ba566e3..ab1868b74 100644
--- a/crypto/src/util/Integers.cs
+++ b/crypto/src/util/Integers.cs
@@ -1,4 +1,7 @@
 using System;
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+using System.Buffers.Binary;
+#endif
 #if NETCOREAPP3_0_OR_GREATER
 using System.Numerics;
 using System.Runtime.Intrinsics.X86;
@@ -8,7 +11,7 @@ using Org.BouncyCastle.Math.Raw;
 
 namespace Org.BouncyCastle.Utilities
 {
-    public abstract class Integers
+    public static class Integers
     {
         public const int NumBits = 32;
         public const int NumBytes = 4;
@@ -96,14 +99,22 @@ namespace Org.BouncyCastle.Utilities
 
         public static int ReverseBytes(int i)
         {
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+            return BinaryPrimitives.ReverseEndianness(i);
+#else
             return (int)ReverseBytes((uint)i);
+#endif
         }
 
         [CLSCompliant(false)]
         public static uint ReverseBytes(uint i)
         {
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+            return BinaryPrimitives.ReverseEndianness(i);
+#else
             return RotateLeft(i & 0xFF00FF00U,  8) |
                    RotateLeft(i & 0x00FF00FFU, 24);
+#endif
         }
 
         public static int RotateLeft(int i, int distance)
diff --git a/crypto/src/util/Longs.cs b/crypto/src/util/Longs.cs
index 9e34dab99..02ffb7676 100644
--- a/crypto/src/util/Longs.cs
+++ b/crypto/src/util/Longs.cs
@@ -1,4 +1,7 @@
 using System;
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+using System.Buffers.Binary;
+#endif
 #if NETCOREAPP3_0_OR_GREATER
 using System.Numerics;
 using System.Runtime.Intrinsics.X86;
@@ -8,7 +11,7 @@ using Org.BouncyCastle.Math.Raw;
 
 namespace Org.BouncyCastle.Utilities
 {
-    public abstract class Longs
+    public static class Longs
     {
         public const int NumBits = 64;
         public const int NumBytes = 8;
@@ -95,16 +98,24 @@ namespace Org.BouncyCastle.Utilities
 
         public static long ReverseBytes(long i)
         {
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+            return BinaryPrimitives.ReverseEndianness(i);
+#else
             return (long)ReverseBytes((ulong)i);
+#endif
         }
 
         [CLSCompliant(false)]
         public static ulong ReverseBytes(ulong i)
         {
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+            return BinaryPrimitives.ReverseEndianness(i);
+#else
             return RotateLeft(i & 0xFF000000FF000000UL,  8) |
                    RotateLeft(i & 0x00FF000000FF0000UL, 24) |
                    RotateLeft(i & 0x0000FF000000FF00UL, 40) |
                    RotateLeft(i & 0x000000FF000000FFUL, 56);
+#endif
         }
 
         public static long RotateLeft(long i, int distance)
diff --git a/crypto/src/util/Platform.cs b/crypto/src/util/Platform.cs
index 75b728bd9..118c29918 100644
--- a/crypto/src/util/Platform.cs
+++ b/crypto/src/util/Platform.cs
@@ -3,7 +3,7 @@ using System.Globalization;
 
 namespace Org.BouncyCastle.Utilities
 {
-    internal abstract class Platform
+    internal static class Platform
     {
         private static readonly CompareInfo InvariantCompareInfo = CultureInfo.InvariantCulture.CompareInfo;
 
diff --git a/crypto/src/util/Strings.cs b/crypto/src/util/Strings.cs
index baee573be..12eafd21e 100644
--- a/crypto/src/util/Strings.cs
+++ b/crypto/src/util/Strings.cs
@@ -4,7 +4,7 @@ using System.Text;
 namespace Org.BouncyCastle.Utilities
 {
     /// <summary> General string utilities.</summary>
-    public abstract class Strings
+    public static class Strings
     {
         internal static bool IsOneOf(string s, params string[] candidates)
         {
diff --git a/crypto/src/util/io/Streams.cs b/crypto/src/util/io/Streams.cs
index c23332909..ac4bd3ae6 100644
--- a/crypto/src/util/io/Streams.cs
+++ b/crypto/src/util/io/Streams.cs
@@ -3,14 +3,10 @@ using System.IO;
 
 namespace Org.BouncyCastle.Utilities.IO
 {
-	public sealed class Streams
+	public static class Streams
 	{
 		private const int BufferSize = 4096;
 
-		private Streams()
-		{
-		}
-
 		public static void Drain(Stream inStr)
 		{
 			inStr.CopyTo(Stream.Null, BufferSize);