update bytewords submodule

Author: gorazdko

deps/bc-bytewords

@@ -0,0 +1,44 @@
+//
+//  crc32.c
+//
+//  Copyright © 2020 by Blockchain Commons, LLC
+//  Licensed under the "BSD-2-Clause Plus Patent License"
+//
+
+#include "crc32.h"
+
+#ifdef ARDUINO
+#define htonl(x) __builtin_bswap32((uint32_t) (x))
+#elif _WIN32
+#include <winsock2.h>
+#include <memory.h>
+#else
+#include <arpa/inet.h>
+#include <memory.h>
+#endif
+
+uint32_t crc32(const uint8_t* bytes, size_t len) {
+    static uint32_t* table = NULL;
+
+    if(table == NULL) {
+        table = malloc(256 * sizeof(uint32_t));
+        for(int i = 0; i < 256; i++) {
+            uint32_t c = i;
+            for(int j = 0; j < 8; j++) {
+                c = (c % 2 == 0) ? (c >> 1) : (0xEDB88320 ^ (c >> 1));
+            }
+            table[i] = c;
+        }
+    }
+
+    uint32_t crc = ~0;
+    for(int i = 0; i < len; i++) {
+        uint32_t byte = bytes[i];
+        crc = (crc >> 8) ^ table[(crc ^ byte) & 0xFF];
+    }
+    return ~crc;
+}
+
+uint32_t crc32n(const uint8_t* bytes, size_t len) {
+    return htonl(crc32(bytes, len));
+}

deps/bc-ur-arduino/src/crc32.c

@@ -0,0 +1,28 @@
+//
+//  crc32.h
+//
+//  Copyright © 2020 by Blockchain Commons, LLC
+//  Licensed under the "BSD-2-Clause Plus Patent License"
+//
+
+#ifndef BC_UR_CRC32_H
+#define BC_UR_CRC32_H
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Returns the CRC-32 checksum of the input buffer.
+uint32_t crc32(const uint8_t* bytes, size_t len);
+
+// Returns the CRC-32 checksum of the input buffer in network byte order (big endian).
+uint32_t crc32n(const uint8_t* bytes, size_t len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // BC_UR_CRC32_H

deps/bc-ur-arduino/src/crc32.h

@@ -6,7 +6,6 @@
 #include "bc-bytewords.h"
 #include "CborEncoder.h"
 #include "wally_core.h"
-#include "crc32.h"
 #include "wally_bip32.h"
 #include "wally_address.h"
 #include "keystore.h"