diff --git a/crc/crc_poly.h b/crc/crc_poly.h
new file mode 100644
index 0000000..ab48e43
--- /dev/null
+++ b/crc/crc_poly.h
@@ -0,0 +1,31 @@
+#ifndef _CRC_CRC_POLY_H
+#define _CRC_CRC_POLY_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus  */
+
+// LSB-first
+uint8_t crc8_poly_lsb(uint8_t poly, uint8_t value);
+
+// MSB-first
+uint8_t crc8_poly_msb(uint8_t poly, uint8_t value);
+
+// LSB-first
+uint16_t crc16_poly_lsb(uint16_t poly, uint16_t value);
+
+// MSB-first
+uint16_t crc16_poly_msb(uint16_t poly, uint16_t value);
+
+// LSB-first
+uint32_t crc32_poly(uint32_t poly, uint16_t value);
+
+// LSB-first
+uint64_t crc64_poly(uint64_t poly, uint16_t value);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus  */
+#endif // _CRC_CRC_POLY_H