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+#ifndef MOD_HMAC_HXX
+#define MOD_HMAC_HXX
+
+#include <libbrep/types.hxx>
+#include <libbrep/utility.hxx>
+
+#include <mod/module-options.hxx>
+
+namespace brep
+{
+ // Compute the HMAC-SHA256 message authentication code over a message using
+ // the given key.
+ //
+ // Return the HMAC or throw std::system_error in case of an error.
+ //
+ // Example output:
+ //
+ // 5e822587094c68e646db8b916da1db2056d92f1dea4252136a533b4147a30cb7
+ //
+ // Note that although any cryptographic hash function can be used to compute
+ // an HMAC, this implementation supports only SHA-256.
+ //
+ string
+ compute_hmac (const options::openssl_options&,
+ const vector<char>& message,
+ const char* key);
+}
+
+#endif