2 files changed, 6 insertions, 2 deletions
diff --git a/src/mac/hmac/hmac.cpp b/src/mac/hmac/hmac.cpp
index 06923138a..284bc87ec 100644
--- a/src/mac/hmac/hmac.cpp
+++ b/src/mac/hmac/hmac.cpp
@@ -85,8 +85,7 @@ MessageAuthenticationCode* HMAC::clone() const
 * HMAC Constructor
 */
 HMAC::HMAC(HashFunction* hash_in) :
-   MessageAuthenticationCode(hash_in->output_length(),
-                             0, 2*hash_in->hash_block_size()),
+   MessageAuthenticationCode(hash_in->output_length()),
    hash(hash_in)
    {
    if(hash->hash_block_size() == 0)
diff --git a/src/mac/hmac/hmac.h b/src/mac/hmac/hmac.h
index 33af62f6a..505d0dd6b 100644
--- a/src/mac/hmac/hmac.h
+++ b/src/mac/hmac/hmac.h
@@ -23,6 +23,11 @@ class BOTAN_DLL HMAC : public MessageAuthenticationCode
       std::string name() const;
       MessageAuthenticationCode* clone() const;
 
+      Key_Length_Specification key_spec() const
+         {
+         return Key_Length_Specification(0, 2*hash->hash_block_size());
+         }
+
       /**
       * @param hash the hash to use for HMACing
       */