[master] Replaced empty for old Botan versions

diff --git a/src/lib/cryptolink/botan_hmac.cc b/src/lib/cryptolink/botan_hmac.cc
index c0dbb495c0d5160c05eb7717b81132bf5df49ffd..454673de8c8d741d8cc1c306a60f0fe286c38d8e 100644 (file)
--- a/src/lib/cryptolink/botan_hmac.cc
+++ b/src/lib/cryptolink/botan_hmac.cc
@@ -183,7 +183,7 @@ public:
             if (len > size) {
                 len = size;
             }
-            if (digest_.empty()) {
+            if (digest_.size() == 0) {
                 digest_ = hmac_->final();
             }
             return (Botan::same_mem(&digest_[0],