1 files changed, 63 insertions, 0 deletions
diff --git a/include/gf_w4.h b/include/gf_w4.h
new file mode 100644
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+++ b/include/gf_w4.h
@@ -0,0 +1,63 @@
+/*
+ * GF-Complete: A Comprehensive Open Source Library for Galois Field Arithmetic
+ * James S. Plank, Ethan L. Miller, Kevin M. Greenan,
+ * Benjamin A. Arnold, John A. Burnum, Adam W. Disney, Allen C. McBride.
+ *
+ * gf_w4.h
+ *
+ * Defines and data structures for 4-bit Galois fields
+ */
+
+#ifndef GF_COMPLETE_GF_W4_H
+#define GF_COMPLETE_GF_W4_H
+
+#include <stdint.h>
+
+#define GF_FIELD_WIDTH      4
+#define GF_DOUBLE_WIDTH     (GF_FIELD_WIDTH*2)
+#define GF_FIELD_SIZE       (1 << GF_FIELD_WIDTH)
+#define GF_MULT_GROUP_SIZE       (GF_FIELD_SIZE-1)
+
+/* ------------------------------------------------------------
+   JSP: Each implementation has its own data, which is allocated
+   at one time as part of the handle. For that reason, it
+   shouldn't be hierarchical -- i.e. one should be able to
+   allocate it with one call to malloc. */
+
+struct gf_logtable_data {
+    uint8_t      log_tbl[GF_FIELD_SIZE];
+    uint8_t      antilog_tbl[GF_FIELD_SIZE * 2];
+    uint8_t      *antilog_tbl_div;
+};
+
+struct gf_single_table_data {
+    uint8_t      mult[GF_FIELD_SIZE][GF_FIELD_SIZE];
+    uint8_t      div[GF_FIELD_SIZE][GF_FIELD_SIZE];
+};
+
+struct gf_double_table_data {
+    uint8_t      div[GF_FIELD_SIZE][GF_FIELD_SIZE];
+    uint8_t      mult[GF_FIELD_SIZE][GF_FIELD_SIZE*GF_FIELD_SIZE];
+};
+struct gf_quad_table_data {
+    uint8_t      div[GF_FIELD_SIZE][GF_FIELD_SIZE];
+    uint16_t     mult[GF_FIELD_SIZE][(1<<16)];
+};
+
+struct gf_quad_table_lazy_data {
+    uint8_t      div[GF_FIELD_SIZE][GF_FIELD_SIZE];
+    uint8_t      smult[GF_FIELD_SIZE][GF_FIELD_SIZE];
+    uint16_t     mult[(1 << 16)];
+};
+
+struct gf_bytwo_data {
+    uint64_t prim_poly;
+    uint64_t mask1;
+    uint64_t mask2;
+};
+
+// ARM NEON init functions
+int gf_w4_neon_cfm_init(gf_t *gf);
+void gf_w4_neon_single_table_init(gf_t *gf);
+
+#endif /* GF_COMPLETE_GF_W4_H */