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+# Utility functions {#api_utility}
+
+Some additional functions are used internally and also exposed in the
+API:
+
+- encoding/decoding binary data: rs_base64(), rs_unbase64(),
+ rs_hexify().
+
+- MD4 message digests: rs_mdfour(), rs_mdfour_begin(),
+ rs_mdfour_update(), rs_mdfour_result().