1 files changed, 35 insertions, 0 deletions
diff --git a/src/pubkey/pk_ops.h b/src/pubkey/pk_ops.h
index 2b9ac4366..5aa50efdb 100644
--- a/src/pubkey/pk_ops.h
+++ b/src/pubkey/pk_ops.h
@@ -9,11 +9,46 @@
 #define BOTAN_PK_OPERATIONS_H__
 
 #include <botan/secmem.h>
+#include <botan/rng.h>
 
 namespace Botan {
 
 namespace PK_Ops {
 
+class Signature_Operation
+   {
+   public:
+      /**
+      * Find out the number of message parts supported by this scheme.
+      * @return the number of message parts
+      */
+      virtual u32bit message_parts() const { return 1; }
+
+      /**
+      * Find out the message part size supported by this scheme/key.
+      * @return the size of the message parts
+      */
+      virtual u32bit message_part_size() const { return 0; }
+
+      /**
+      * Get the maximum message size in bits supported by this public key.
+      * @return the maximum message in bits
+      */
+      virtual u32bit max_input_bits() const = 0;
+
+      /*
+      * Perform a signature operation
+      * @param msg the message
+      * @param msg_len the length of msg in bytes
+      * @param rng a random number generator
+      */
+      virtual SecureVector<byte> sign(const byte msg[],
+                                      u32bit msg_len,
+                                      RandomNumberGenerator& rng) = 0;
+
+      virtual ~Signature_Operation() {}
+   };
+
 /*
 * A generic Key Agreement Operation (eg DH or ECDH)
 */