1 files changed, 29 insertions, 0 deletions
diff --git a/speck.c b/speck.c
new file mode 100644
index 0000000..4b839e7
--- /dev/null
+++ b/speck.c
@@ -0,0 +1,29 @@
+#include <linux/kernel.h>
+
+#define R(x, y, k) (x = ror64(x, 8), x += y, x ^= k, y = rol64(y, 3), y ^= x)
+#define ROUNDS 32
+
+static inline void speck(u64 ct[2], const u64 pt[2], const u64 key[2])
+{
+	u64 y = pt[0], x = pt[1], b = key[0], a = key[1];
+	int i;
+
+	R(x, y, b);
+	for (i = 0; i < ROUNDS - 1; ++i) {
+		R(a, b, i);
+		R(x, y, b);
+	}
+	ct[0] = y;
+	ct[1] = x;
+}
+
+void mix_speck(u32 h[4], const u32 v[4])
+{
+	u32 n[4];
+
+	speck((u64 *)n, (u64 *)h, (const u64 *)v);
+	h[0] ^= n[0];
+	h[1] ^= n[1];
+	h[2] ^= n[2];
+	h[3] ^= n[3];
+}