2 files changed, 18 insertions, 0 deletions
diff --git a/crypto/src/crypto/ISigner.cs b/crypto/src/crypto/ISigner.cs
index 0e2851304..49b7e6406 100644
--- a/crypto/src/crypto/ISigner.cs
+++ b/crypto/src/crypto/ISigner.cs
@@ -35,6 +35,11 @@ namespace Org.BouncyCastle.Crypto
         /// <returns>A byte array containing the signature for the message.</returns>
         byte[] GenerateSignature();
 
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+        // TODO[api]
+        //int GenerateSignature(Span<byte> output);
+#endif
+
         /// <summary>Return true if the internal state represents the signature described in the passed in array.
         /// </summary>
         /// <param name="signature">an array containing the candidate signature to verify.</param>
diff --git a/crypto/src/pqc/crypto/IMessageSigner.cs b/crypto/src/pqc/crypto/IMessageSigner.cs
index cef23898c..fdf3a1009 100644
--- a/crypto/src/pqc/crypto/IMessageSigner.cs
+++ b/crypto/src/pqc/crypto/IMessageSigner.cs
@@ -10,15 +10,28 @@ namespace Org.BouncyCastle.Pqc.Crypto
         /// <param name="param">parameters for signature generation or verification.</param>
         void Init(bool forSigning, ICipherParameters param);
 
+        // TODO[api]
+        //int GetMaxSignatureSize();
+
         /// <summary>Sign a message.</summary>
         /// <param name="message">the message to be signed.</param>
         /// <returns>the signature of the message.</returns>
         byte[] GenerateSignature(byte[] message);
 
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+        // TODO[api]
+        //int GenerateSignature(Span<byte> output);
+#endif
+
         /// <summary>Verify a purported signature for a message.</summary>
         /// <param name="message">the message supposedly signed.</param>
         /// <param name="signature">the purported signature to verify.</param>
         /// <returns>true if and only if the signature verified against the message.</returns>
         bool VerifySignature(byte[] message, byte[] signature);
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+        // TODO[api]
+        //bool VerifySignature(ReadOnlySpan<byte> message, ReadOnlySpan<byte> signature);
+#endif
     }
 }