2 files changed, 10 insertions, 1 deletions
diff --git a/crypto/test/src/crypto/prng/test/TestEntropySourceProvider.cs b/crypto/test/src/crypto/prng/test/TestEntropySourceProvider.cs
index ae80b3dbe..1c0d24dba 100644
--- a/crypto/test/src/crypto/prng/test/TestEntropySourceProvider.cs
+++ b/crypto/test/src/crypto/prng/test/TestEntropySourceProvider.cs
@@ -53,7 +53,7 @@ namespace Org.BouncyCastle.Crypto.Prng.Test
 #if NET6_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER
             int IEntropySource.GetEntropy(Span<byte> output)
             {
-                int length = bitsRequired / 8;
+                int length = System.Math.Min(output.Length, bitsRequired / 8);
                 data.AsSpan(index, length).CopyTo(output);
                 index += length;
                 return length;
diff --git a/crypto/test/src/util/test/FixedSecureRandom.cs b/crypto/test/src/util/test/FixedSecureRandom.cs
index a7f3c1f3b..a23438794 100644
--- a/crypto/test/src/util/test/FixedSecureRandom.cs
+++ b/crypto/test/src/util/test/FixedSecureRandom.cs
@@ -213,6 +213,15 @@ namespace Org.BouncyCastle.Utilities.Test
             return GetNextBytes(this, numBytes);
         }
 
+        // NOTE: .NET Core 3.1 has Span<T>, but is tested against our .NET Standard 2.0 assembly.
+//#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+#if NET6_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+        public override void GenerateSeed(Span<byte> seed)
+        {
+            NextBytes(seed);
+        }
+#endif
+
         public override void NextBytes(byte[] buf)
 		{
             NextBytes(buf, 0, buf.Length);