X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=crypto%2Flibeddsa%2Flib%2Fsc.h;fp=crypto%2Flibeddsa%2Flib%2Fsc.h;h=e8212d27e3547ecdfadc2b99a66e37310e586139;hb=7bfbc0423ba40ea5156e06c8fb62bacd5ea93390;hp=0000000000000000000000000000000000000000;hpb=2ae349f5ed63b026cff763b35984dd36b330870a;p=zpackage

diff --git a/crypto/libeddsa/lib/sc.h b/crypto/libeddsa/lib/sc.h
new file mode 100644
index 0000000..e8212d2
--- /dev/null
+++ b/crypto/libeddsa/lib/sc.h
@@ -0,0 +1,64 @@
+#ifndef SC_H
+#define SC_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "bitness.h"
+#include "compat.h"
+#include "limb.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef USE_64BIT
+
+#define SC_LIMB_NUM	5
+#define SC_LIMB_BITS	52
+
+#define SC_LIMB_MASK	((1L << SC_LIMB_BITS)-1)
+
+#else
+
+#define SC_LIMB_NUM	10
+#define SC_LIMB_BITS	26
+
+#define SC_LIMB_MASK	((1 << SC_LIMB_BITS)-1)
+
+#endif
+
+
+#define SC_BITS		(SC_LIMB_NUM * SC_LIMB_BITS)
+
+
+/* sc_t holds 260bit in reduced form */
+typedef limb_t sc_t[SC_LIMB_NUM];
+
+/* lsc_t is double in size and holds up to 520bits in reduced form */
+typedef limb_t lsc_t [2*SC_LIMB_NUM];
+
+
+
+extern const sc_t con_off;
+
+
+void	sc_reduce(sc_t dst, const lsc_t src);
+void	sc_import(sc_t dst, const uint8_t *src, size_t len);
+void	sc_export(uint8_t dst[32], const sc_t x);
+void	sc_mul(sc_t res, const sc_t a, const sc_t b);
+int	sc_jsf(int u0[SC_BITS+1], int u1[SC_BITS+1], const sc_t a, const sc_t b);
+
+
+static INLINE void
+sc_add(sc_t res, const sc_t a, const sc_t b)
+{
+	int i;
+	for (i = 0; i < SC_LIMB_NUM; i++)
+		res[i] = a[i] + b[i];
+}
+
+#ifdef __cplusplus
+}
+#endif
+#endif