Add PK_Signer::signature_length

2 files changed, 8 insertions, 0 deletions

diff --git a/src/lib/pubkey/xmss/xmss_signature_operation.cpp b/src/lib/pubkey/xmss/xmss_signature_operation.cpp
index c3e43bfc9..d6a57bb08 100644
--- a/src/lib/pubkey/xmss/xmss_signature_operation.cpp
+++ b/src/lib/pubkey/xmss/xmss_signature_operation.cpp
@@ -52,6 +52,12 @@ XMSS_Signature_Operation::sign(const secure_vector<uint8_t>& msg_hash,
    return sig;
    }
 
+size_t XMSS_Signature_Operation::signature_length() const
+   {
+   // TODO bound this by the params
+   return 128*1024;
+   }
+
 wots_keysig_t
 XMSS_Signature_Operation::build_auth_path(XMSS_PrivateKey& priv_key,
       XMSS_Address& adrs)
diff --git a/src/lib/pubkey/xmss/xmss_signature_operation.h b/src/lib/pubkey/xmss/xmss_signature_operation.h
index 5c1a14662..a1c395fa6 100644
--- a/src/lib/pubkey/xmss/xmss_signature_operation.h
+++ b/src/lib/pubkey/xmss/xmss_signature_operation.h
@@ -48,6 +48,8 @@ class XMSS_Signature_Operation final : public virtual PK_Ops::Signature,
 
       void update(const uint8_t msg[], size_t msg_len) override;
 
+      size_t signature_length() const override;
+
    private:
       /**
        * Algorithm 11: "treeSig"