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41 lines
881 B
C
41 lines
881 B
C
/*
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* Copyright (C) 2017 Richard Hughes <richard@hughsie.com>
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*
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* SPDX-License-Identifier: LGPL-2.1+
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*/
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#include "config.h"
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#include <string.h>
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#include "fu-nitrokey-common.h"
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static guint32
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fu_nitrokey_perform_crc32_mutate (guint32 crc, guint32 data)
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{
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crc = crc ^ data;
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for (guint i = 0; i < 32; i++) {
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if (crc & 0x80000000) {
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/* polynomial used in STM32 */
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crc = (crc << 1) ^ 0x04C11DB7;
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} else {
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crc = (crc << 1);
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}
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}
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return crc;
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}
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guint32
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fu_nitrokey_perform_crc32 (const guint8 *data, gsize size)
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{
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guint32 crc = 0xffffffff;
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g_autofree guint32 *data_aligned = NULL;
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data_aligned = g_new0 (guint32, (size / 4) + 1);
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memcpy (data_aligned, data, size);
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for (gsize idx = 0; idx * 4 < size; idx++) {
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guint32 data_aligned_le = GUINT32_FROM_LE (data_aligned[idx]);
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crc = fu_nitrokey_perform_crc32_mutate (crc, data_aligned_le);
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}
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return crc;
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}
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