From 114297f192b5da1b789ea554ed02e7329cc2e9fb Mon Sep 17 00:00:00 2001
From: Peter Dettman <peter.dettman@bouncycastle.org>
Date: Tue, 30 Aug 2022 17:35:03 +0700
Subject: Span-based variant for IAeadCipher.DoFinal

---
 crypto/src/util/Arrays.cs | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

(limited to 'crypto/src/util')

diff --git a/crypto/src/util/Arrays.cs b/crypto/src/util/Arrays.cs
index 7a1e80115..d3dae98a9 100644
--- a/crypto/src/util/Arrays.cs
+++ b/crypto/src/util/Arrays.cs
@@ -124,11 +124,27 @@ namespace Org.BouncyCastle.Utilities
             int d = 0;
             for (int i = 0; i < len; ++i)
             {
-                d |= (a[aOff + i] ^ b[bOff + i]);
+                d |= a[aOff + i] ^ b[bOff + i];
             }
             return 0 == d;
         }
 
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+        public static bool ConstantTimeAreEqual(Span<byte> a, Span<byte> b)
+        {
+            if (a.Length != b.Length)
+                throw new ArgumentException("Spans to compare must have equal length");
+
+            int d = 0;
+            for (int i = 0, count = a.Length; i < count; ++i)
+            {
+                d |= a[i] ^ b[i];
+            }
+            return 0 == d;
+
+        }
+#endif
+
         public static bool AreEqual(
             int[]	a,
             int[]	b)
-- 
cgit 1.4.1