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-rw-r--r--crypto/src/openpgp/PgpEncryptedData.cs29
-rw-r--r--crypto/src/openpgp/WrappedGeneratorStream.cs5
2 files changed, 30 insertions, 4 deletions
diff --git a/crypto/src/openpgp/PgpEncryptedData.cs b/crypto/src/openpgp/PgpEncryptedData.cs
index 5cdc0d533..bad4cb8cd 100644
--- a/crypto/src/openpgp/PgpEncryptedData.cs
+++ b/crypto/src/openpgp/PgpEncryptedData.cs
@@ -54,6 +54,9 @@ namespace Org.BouncyCastle.Bcpg.OpenPgp
             {
 				Streams.ValidateBufferArguments(buffer, offset, count);
 
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+                return Read(buffer.AsSpan(offset, count));
+#else
                 int avail = bufEnd - bufStart;
 
                 int pos = offset;
@@ -73,8 +76,34 @@ namespace Org.BouncyCastle.Bcpg.OpenPgp
                 bufStart += count;
 
                 return pos + count - offset;
+#endif
             }
 
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+            public override int Read(Span<byte> buffer)
+            {
+                int avail = bufEnd - bufStart;
+
+                int pos = 0, count = buffer.Length;
+                while (count > avail)
+                {
+                    lookAhead.AsSpan(bufStart, avail).CopyTo(buffer[pos..]);
+
+                    bufStart += avail;
+                    pos += avail;
+                    count -= avail;
+
+                    if ((avail = FillBuffer()) < 1)
+                        return pos;
+                }
+
+                lookAhead.AsSpan(bufStart, count).CopyTo(buffer[pos..]);
+                bufStart += count;
+
+                return pos + count;
+            }
+#endif
+
             public override int ReadByte()
             {
                 if (bufStart < bufEnd)
diff --git a/crypto/src/openpgp/WrappedGeneratorStream.cs b/crypto/src/openpgp/WrappedGeneratorStream.cs
index c54ee0b3b..6f96dc9b8 100644
--- a/crypto/src/openpgp/WrappedGeneratorStream.cs
+++ b/crypto/src/openpgp/WrappedGeneratorStream.cs
@@ -13,10 +13,7 @@ namespace Org.BouncyCastle.Bcpg.OpenPgp
 		internal WrappedGeneratorStream(IStreamGenerator generator, Stream s)
 			: base(s)
 		{
-			if (generator == null)
-				throw new ArgumentNullException(nameof(generator));
-
-			m_generator = generator;
+			m_generator = generator ?? throw new ArgumentNullException(nameof(generator));
 		}
 
         protected override void Dispose(bool disposing)