1 files changed, 5 insertions, 0 deletions
diff --git a/src/block/block_cipher.h b/src/block/block_cipher.h
index 06e8c5cea..b3e1b0e31 100644
--- a/src/block/block_cipher.h
+++ b/src/block/block_cipher.h
@@ -24,6 +24,11 @@ class BOTAN_DLL BlockCipher : public SymmetricAlgorithm
       const u32bit BLOCK_SIZE;
 
       /**
+      * @return the preferred parallelism of this cipher
+      */
+      virtual u32bit parallelism() const { return 1; }
+
+      /**
       * Encrypt a block.
       * @param in The plaintext block to be encrypted as a byte array.
       * Must be of length BLOCK_SIZE.