1 files changed, 80 insertions, 0 deletions
diff --git a/src/precompute_ecmult_gen.c b/src/precompute_ecmult_gen.c
new file mode 100644
index 0000000000..7c6359c402
--- /dev/null
+++ b/src/precompute_ecmult_gen.c
@@ -0,0 +1,80 @@
+/*********************************************************************************
+ * Copyright (c) 2013, 2014, 2015, 2021 Thomas Daede, Cory Fields, Pieter Wuille *
+ * Distributed under the MIT software license, see the accompanying              *
+ * file COPYING or https://www.opensource.org/licenses/mit-license.php.          *
+ *********************************************************************************/
+
+#include <inttypes.h>
+#include <stdio.h>
+
+#include "../include/secp256k1.h"
+#include "assumptions.h"
+#include "util.h"
+#include "group.h"
+#include "ecmult_gen.h"
+#include "ecmult_gen_compute_table_impl.h"
+
+int main(int argc, char **argv) {
+    const char outfile[] = "src/precomputed_ecmult_gen.c";
+    FILE* fp;
+    int bits;
+
+    (void)argc;
+    (void)argv;
+
+    fp = fopen(outfile, "w");
+    if (fp == NULL) {
+        fprintf(stderr, "Could not open %s for writing!\n", outfile);
+        return -1;
+    }
+
+    fprintf(fp, "/* This file was automatically generated by precompute_ecmult_gen. */\n");
+    fprintf(fp, "/* See ecmult_gen_impl.h for details about the contents of this file. */\n");
+    fprintf(fp, "#if defined HAVE_CONFIG_H\n");
+    fprintf(fp, "#    include \"libsecp256k1-config.h\"\n");
+    fprintf(fp, "#endif\n");
+    fprintf(fp, "#include \"../include/secp256k1.h\"\n");
+    fprintf(fp, "#include \"group.h\"\n");
+    fprintf(fp, "#include \"ecmult_gen.h\"\n");
+    fprintf(fp, "#include \"precomputed_ecmult_gen.h\"\n");
+    fprintf(fp, "#ifdef EXHAUSTIVE_TEST_ORDER\n");
+    fprintf(fp, "#    error Cannot compile precomputed_ecmult_gen.c in exhaustive test mode\n");
+    fprintf(fp, "#endif /* EXHAUSTIVE_TEST_ORDER */\n");
+    fprintf(fp, "#define S(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) SECP256K1_GE_STORAGE_CONST(0x##a##u,0x##b##u,0x##c##u,0x##d##u,0x##e##u,0x##f##u,0x##g##u,0x##h##u,0x##i##u,0x##j##u,0x##k##u,0x##l##u,0x##m##u,0x##n##u,0x##o##u,0x##p##u)\n");
+    fprintf(fp, "const secp256k1_ge_storage secp256k1_ecmult_gen_prec_table[ECMULT_GEN_PREC_N(ECMULT_GEN_PREC_BITS)][ECMULT_GEN_PREC_G(ECMULT_GEN_PREC_BITS)] = {\n");
+
+    for (bits = 2; bits <= 8; bits *= 2) {
+        int g = ECMULT_GEN_PREC_G(bits);
+        int n = ECMULT_GEN_PREC_N(bits);
+        int inner, outer;
+
+        secp256k1_ge_storage* table = checked_malloc(&default_error_callback, n * g * sizeof(secp256k1_ge_storage));
+        secp256k1_ecmult_gen_compute_table(table, &secp256k1_ge_const_g, bits);
+
+        fprintf(fp, "#if ECMULT_GEN_PREC_BITS == %d\n", bits);
+        for(outer = 0; outer != n; outer++) {
+            fprintf(fp,"{");
+            for(inner = 0; inner != g; inner++) {
+                fprintf(fp, "S(%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32
+                            ",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32")",
+                        SECP256K1_GE_STORAGE_CONST_GET(table[outer * g + inner]));
+                if (inner != g - 1) {
+                    fprintf(fp,",\n");
+                } 
+            }
+            if (outer != n - 1) {
+                fprintf(fp,"},\n");
+            } else {
+                fprintf(fp,"}\n");
+            }
+        }
+        fprintf(fp, "#endif\n");
+        free(table);
+    }
+
+    fprintf(fp, "};\n");
+    fprintf(fp, "#undef S\n");
+    fclose(fp);
+
+    return 0;
+}