diff --git a/crypto/src/util/Longs.cs b/crypto/src/util/Longs.cs
new file mode 100644
index 000000000..d206c1f81
--- /dev/null
+++ b/crypto/src/util/Longs.cs
@@ -0,0 +1,65 @@
+using System;
+
+using Org.BouncyCastle.Math.Raw;
+
+namespace Org.BouncyCastle.Utilities
+{
+ public abstract class Longs
+ {
+ public static long Reverse(long i)
+ {
+ i = (long)Bits.BitPermuteStepSimple((ulong)i, 0x5555555555555555UL, 1);
+ i = (long)Bits.BitPermuteStepSimple((ulong)i, 0x3333333333333333UL, 2);
+ i = (long)Bits.BitPermuteStepSimple((ulong)i, 0x0F0F0F0F0F0F0F0FUL, 4);
+ return ReverseBytes(i);
+ }
+
+ [CLSCompliantAttribute(false)]
+ public static ulong Reverse(ulong i)
+ {
+ i = Bits.BitPermuteStepSimple(i, 0x5555555555555555UL, 1);
+ i = Bits.BitPermuteStepSimple(i, 0x3333333333333333UL, 2);
+ i = Bits.BitPermuteStepSimple(i, 0x0F0F0F0F0F0F0F0FUL, 4);
+ return ReverseBytes(i);
+ }
+
+ public static long ReverseBytes(long i)
+ {
+ return RotateLeft((long)((ulong)i & 0xFF000000FF000000UL), 8) |
+ RotateLeft((long)((ulong)i & 0x00FF000000FF0000UL), 24) |
+ RotateLeft((long)((ulong)i & 0x0000FF000000FF00UL), 40) |
+ RotateLeft((long)((ulong)i & 0x000000FF000000FFUL), 56);
+ }
+
+ [CLSCompliantAttribute(false)]
+ public static ulong ReverseBytes(ulong i)
+ {
+ return RotateLeft(i & 0xFF000000FF000000UL, 8) |
+ RotateLeft(i & 0x00FF000000FF0000UL, 24) |
+ RotateLeft(i & 0x0000FF000000FF00UL, 40) |
+ RotateLeft(i & 0x000000FF000000FFUL, 56);
+ }
+
+ public static long RotateLeft(long i, int distance)
+ {
+ return (i << distance) ^ (long)((ulong)i >> -distance);
+ }
+
+ [CLSCompliantAttribute(false)]
+ public static ulong RotateLeft(ulong i, int distance)
+ {
+ return (i << distance) ^ (i >> -distance);
+ }
+
+ public static long RotateRight(long i, int distance)
+ {
+ return (long)((ulong)i >> distance) ^ (i << -distance);
+ }
+
+ [CLSCompliantAttribute(false)]
+ public static ulong RotateRight(ulong i, int distance)
+ {
+ return (i >> distance) ^ (i << -distance);
+ }
+ }
+}
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