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diff --git a/src/ed25519/sc.h b/src/ed25519/sc.h
new file mode 100644
index 00000000..8fa727ef
--- /dev/null
+++ b/src/ed25519/sc.h
@@ -0,0 +1,12 @@
+#ifndef SC_H
+#define SC_H
+
+/*
+The set of scalars is \Z/l
+where l = 2^252 + 27742317777372353535851937790883648493.
+*/
+
+void sc_reduce(unsigned char *s);
+void sc_muladd(unsigned char *s, const unsigned char *a, const unsigned char *b, const unsigned char *c);
+
+#endif
\ No newline at end of file