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diff --git a/src/common.h b/src/common.h
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+/**
+ * sha3sum – SHA-3 (Keccak) checksum calculator
+ * 
+ * Copyright © 2013, 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef SHA3SUM_COMMON_H
+#define SHA3SUM_COMMON_H 1
+
+
+#include <libkeccak.h>
+
+
+
+/**
+ * Print the checksum in binary
+ */
+#define REPRESENTATION_BINARY  0
+
+/**
+ * Print the checksum in upper case hexadecimal
+ */
+#define REPRESENTATION_UPPER_CASE  1
+
+/**
+ * Print the checksum in lower case hexadecimal
+ */
+#define REPRESENTATION_LOWER_CASE  2
+
+
+
+/**
+ * Print the checksum of a file
+ * 
+ * @param   filename        The file to hash
+ * @param   gspec           Hashing parameters
+ * @param   squeezes        The  number of squeezes to perform
+ * @param   suffix          The message suffix
+ * @param   representation  Either of `REPRESENTATION_BINARY`, `REPRESENTATION_UPPER_CASE`
+ *                          and `REPRESENTATION_LOWER_CASE`
+ * @param   verbose         Whether to print the hashing parameters
+ * @param   execname        `argv[0]` from `main`
+ * @return                  Zero on succes, an appropriate exit value on error
+ */
+int print_checksum(const char* restrict filename, libkeccak_generalised_spec_t* restrict gspec,
+		   long squeezes, const char* restrict suffix, int representation, int verbose,
+		   const char* restrict execname);
+
+
+#endif
+