100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*
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* GF-Complete: A Comprehensive Open Source Library for Galois Field Arithmetic
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* James S. Plank, Ethan L. Miller, Kevin M. Greenan,
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* Benjamin A. Arnold, John A. Burnum, Adam W. Disney, Allen C. McBride.
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*
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* gf_w8.c
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*
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* Defines and data stuctures for 8-bit Galois fields
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*/
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#ifndef GF_COMPLETE_GF_W8_H
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#define GF_COMPLETE_GF_W8_H
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#include "gf_int.h"
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#include <stdint.h>
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#define GF_FIELD_WIDTH (8)
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#define GF_FIELD_SIZE (1 << GF_FIELD_WIDTH)
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#define GF_HALF_SIZE (1 << (GF_FIELD_WIDTH/2))
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#define GF_MULT_GROUP_SIZE GF_FIELD_SIZE-1
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#define GF_BASE_FIELD_WIDTH (4)
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#define GF_BASE_FIELD_SIZE (1 << GF_BASE_FIELD_WIDTH)
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struct gf_w8_logtable_data {
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uint8_t log_tbl[GF_FIELD_SIZE];
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uint8_t antilog_tbl[GF_FIELD_SIZE * 2];
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uint8_t inv_tbl[GF_FIELD_SIZE];
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};
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struct gf_w8_logzero_table_data {
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short log_tbl[GF_FIELD_SIZE]; /* Make this signed, so that we can divide easily */
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uint8_t antilog_tbl[512+512+1];
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uint8_t *div_tbl;
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uint8_t *inv_tbl;
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};
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struct gf_w8_logzero_small_table_data {
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short log_tbl[GF_FIELD_SIZE]; /* Make this signed, so that we can divide easily */
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uint8_t antilog_tbl[255*3];
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uint8_t inv_tbl[GF_FIELD_SIZE];
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uint8_t *div_tbl;
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};
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struct gf_w8_composite_data {
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uint8_t *mult_table;
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};
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/* Don't change the order of these relative to gf_w8_half_table_data */
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struct gf_w8_default_data {
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uint8_t high[GF_FIELD_SIZE][GF_HALF_SIZE];
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uint8_t low[GF_FIELD_SIZE][GF_HALF_SIZE];
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uint8_t divtable[GF_FIELD_SIZE][GF_FIELD_SIZE];
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uint8_t multtable[GF_FIELD_SIZE][GF_FIELD_SIZE];
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};
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struct gf_w8_half_table_data {
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uint8_t high[GF_FIELD_SIZE][GF_HALF_SIZE];
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uint8_t low[GF_FIELD_SIZE][GF_HALF_SIZE];
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};
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struct gf_w8_single_table_data {
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uint8_t divtable[GF_FIELD_SIZE][GF_FIELD_SIZE];
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uint8_t multtable[GF_FIELD_SIZE][GF_FIELD_SIZE];
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};
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struct gf_w8_double_table_data {
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uint8_t div[GF_FIELD_SIZE][GF_FIELD_SIZE];
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uint16_t mult[GF_FIELD_SIZE][GF_FIELD_SIZE*GF_FIELD_SIZE];
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};
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struct gf_w8_double_table_lazy_data {
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uint8_t div[GF_FIELD_SIZE][GF_FIELD_SIZE];
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uint8_t smult[GF_FIELD_SIZE][GF_FIELD_SIZE];
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uint16_t mult[GF_FIELD_SIZE*GF_FIELD_SIZE];
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};
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struct gf_w4_logtable_data {
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uint8_t log_tbl[GF_BASE_FIELD_SIZE];
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uint8_t antilog_tbl[GF_BASE_FIELD_SIZE * 2];
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uint8_t *antilog_tbl_div;
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};
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struct gf_w4_single_table_data {
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uint8_t div[GF_BASE_FIELD_SIZE][GF_BASE_FIELD_SIZE];
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uint8_t mult[GF_BASE_FIELD_SIZE][GF_BASE_FIELD_SIZE];
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};
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struct gf_w8_bytwo_data {
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uint64_t prim_poly;
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uint64_t mask1;
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uint64_t mask2;
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};
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int gf_w8_neon_cfm_init(gf_t *gf);
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void gf_w8_neon_split_init(gf_t *gf);
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#endif /* GF_COMPLETE_GF_W8_H */
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