diff --git a/lib/decoding/osmocom/core/crc64gen.h b/lib/decoding/osmocom/core/crc64gen.h
new file mode 100644
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+++ b/lib/decoding/osmocom/core/crc64gen.h
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+/*
+ * crc64gen.h
+ *
+ * Copyright (C) 2011  Sylvain Munaut <tnt@246tNt.com>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#pragma once
+
+/*! \addtogroup crcgen
+ *  @{
+ */
+
+/*! \file crc64gen.h
+ * Osmocom generic CRC routines (for max 64 bits poly) header
+ */
+
+
+#include <stdint.h>
+#include <osmocom/core/bits.h>
+
+
+/*! \brief structure describing a given CRC code of max 64 bits */
+struct osmo_crc64gen_code {
+	int bits;           /*!< \brief Actual number of bits of the CRC */
+	uint64_t poly;      /*!< \brief Polynom (normal representation, MSB omitted */
+	uint64_t init;      /*!< \brief Initialization value of the CRC state */
+	uint64_t remainder; /*!< \brief Remainder of the CRC (final XOR) */
+};
+
+uint64_t osmo_crc64gen_compute_bits(const struct osmo_crc64gen_code *code,
+                                    const ubit_t *in, int len);
+int osmo_crc64gen_check_bits(const struct osmo_crc64gen_code *code,
+                             const ubit_t *in, int len, const ubit_t *crc_bits);
+void osmo_crc64gen_set_bits(const struct osmo_crc64gen_code *code,
+                            const ubit_t *in, int len, ubit_t *crc_bits);
+
+
+/*! @} */
+
+/* vim: set syntax=c: */