From d8df5908be185bcf0ee3e32636b2ef0319626966 Mon Sep 17 00:00:00 2001
From: Peter Dettman <peter.dettman@bouncycastle.org>
Date: Tue, 30 Aug 2022 14:29:05 +0700
Subject: Add span concatenation methods

---
 crypto/src/util/Arrays.cs | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'crypto/src')

diff --git a/crypto/src/util/Arrays.cs b/crypto/src/util/Arrays.cs
index 247f3ab77..7a1e80115 100644
--- a/crypto/src/util/Arrays.cs
+++ b/crypto/src/util/Arrays.cs
@@ -944,5 +944,37 @@ namespace Org.BouncyCastle.Utilities
         {
             return null == array || array.Length < 1;
         }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+
+        public static byte[] Concatenate(ReadOnlySpan<byte> a, ReadOnlySpan<byte> b)
+        {
+            byte[] rv = new byte[a.Length + b.Length];
+            a.CopyTo(rv);
+            b.CopyTo(rv.AsSpan(a.Length));
+            return rv;
+        }
+
+        public static byte[] Concatenate(ReadOnlySpan<byte> a, ReadOnlySpan<byte> b, ReadOnlySpan<byte> c)
+        {
+            byte[] rv = new byte[a.Length + b.Length + c.Length];
+            a.CopyTo(rv);
+            b.CopyTo(rv.AsSpan(a.Length));
+            c.CopyTo(rv.AsSpan(a.Length + b.Length));
+            return rv;
+        }
+
+        public static byte[] Concatenate(ReadOnlySpan<byte> a, ReadOnlySpan<byte> b, ReadOnlySpan<byte> c,
+            ReadOnlySpan<byte> d)
+        {
+            byte[] rv = new byte[a.Length + b.Length + c.Length + d.Length];
+            a.CopyTo(rv);
+            b.CopyTo(rv.AsSpan(a.Length));
+            c.CopyTo(rv.AsSpan(a.Length + b.Length));
+            d.CopyTo(rv.AsSpan(a.Length + b.Length + c.Length));
+            return rv;
+        }
+
+#endif
     }
 }
-- 
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