Compile secp256 in U-boot

.gitignore

@@ -13,7 +13,6 @@ gen_context
 *.a
 !.gitignore
 
-Makefile
 configure
 .libs/
 Makefile.in

Kconfig

@@ -0,0 +1,12 @@
+config DSA 
+	bool "Use secp256k DSA Library"
+	help
+	  DSA support. This enables the ECDSA algorithm used for FIT image
+	  verification in U-Boot.
+	  See doc/uImage.FIT/signature.txt for more details.
+if DSA
+
+config SPL_DSA
+	bool "Use DSA Library within SPL"
+
+endif

Makefile

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# note this is NOT autogenerated from Makefile.am, etc
+#
+#
+# Copyright (c) 2013, Google Inc.
+#
+# (C) Copyright 2000-2007
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+# (C) Copyright 2019, SiFive Inc
+
+obj-$(CONFIG_$(SPL_)FIT_SIGNATURE) += src/secp256k1.o

src/ecmult_impl.h

@@ -7,8 +7,11 @@
 #ifndef SECP256K1_ECMULT_IMPL_H
 #define SECP256K1_ECMULT_IMPL_H
 
+/*
 #include <string.h>
 #include <stdint.h>
+*/
+#include <linux/types.h>
 
 #include "group.h"
 #include "scalar.h"
@@ -785,7 +788,7 @@ static size_t secp256k1_pippenger_bucket_window_inv(int bucket_window) {
         case 9: return 4420;
         case 10: return 7880;
         case 11: return 16050;
-        case PIPPENGER_MAX_BUCKET_WINDOW: return SIZE_MAX;
+        case PIPPENGER_MAX_BUCKET_WINDOW: return __SIZE_MAX__;
 #else
         case 1: return 1;
         case 2: return 11;
@@ -798,7 +801,7 @@ static size_t secp256k1_pippenger_bucket_window_inv(int bucket_window) {
         case 9: return 9630;
         case 10: return 17900;
         case 11: return 32800;
-        case PIPPENGER_MAX_BUCKET_WINDOW: return SIZE_MAX;
+        case PIPPENGER_MAX_BUCKET_WINDOW: return __SIZE_MAX__;
 #endif
     }
     return 0;

src/field_10x26.h

@@ -7,7 +7,12 @@
 #ifndef SECP256K1_FIELD_REPR_H
 #define SECP256K1_FIELD_REPR_H
 
+/*
 #include <stdint.h>
+*/
+#include <linux/types.h>
+
+
 
 typedef struct {
     /* X = sum(i=0..9, elem[i]*2^26) mod n */

src/hash.h

@@ -8,7 +8,10 @@
 #define SECP256K1_HASH_H
 
 #include <stdlib.h>
+/*
 #include <stdint.h>
+*/
+#include <linux/types.h>
 
 typedef struct {
     uint32_t s[8];

src/hash_impl.h

@@ -10,8 +10,12 @@
 #include "hash.h"
 
 #include <stdlib.h>
-#include <stdint.h>
+/*
 #include <string.h>
+#include <stdint.h>
+*/
+#include <linux/types.h>
+
 
 #define Ch(x,y,z) ((z) ^ ((x) & ((y) ^ (z))))
 #define Maj(x,y,z) (((x) & (y)) | ((z) & ((x) | (y))))

src/scalar_8x32.h

@@ -7,7 +7,11 @@
 #ifndef SECP256K1_SCALAR_REPR_H
 #define SECP256K1_SCALAR_REPR_H
 
+/*
 #include <stdint.h>
+*/
+#include <linux/types.h>
+
 
 /** A scalar modulo the group order of the secp256k1 curve. */
 typedef struct {

src/secp256k1.c

@@ -4,7 +4,10 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#include "include/secp256k1.h"
+#define USE_BASIC_CONFIG 1
+#include "basic-config.h"
+
+#include "../include/secp256k1.h"
 
 #include "util.h"
 #include "num_impl.h"

src/util.h

@@ -11,8 +11,11 @@
 #include "libsecp256k1-config.h"
 #endif
 
-#include <stdlib.h>
+/*
 #include <stdint.h>
+*/
+#include <linux/types.h>
+#include <stdlib.h>
 #include <stdio.h>
 
 typedef struct {