diff --git a/common/crc.c b/common/crc.c
index 0237fb36a..22bfad035 100644
--- a/common/crc.c
+++ b/common/crc.c
@@ -126,3 +126,11 @@ uint32_t CRC8Legic(uint8_t *buff, size_t size) {
         crc_update2(&crc, buff[i], 8);
     return reflect8(crc_finish(&crc));
 }
+// width=8  poly=0x107, init=0x2C  refin=true  refout=true  xorout=0x0000  check=0 name="CRC-8/CARDX"
+uint32_t CRC8Cardx(uint8_t *buff, size_t size) {
+    crc_t crc;
+    crc_init_ref(&crc, 8, 0x107, 0x2C, 0, true, true);
+    for (size_t i = 0; i < size; ++i)
+        crc_update2(&crc, buff[i], 8);
+    return crc_finish(&crc);
+}
diff --git a/common/crc.h b/common/crc.h
index 6dcfe918f..772c278b8 100644
--- a/common/crc.h
+++ b/common/crc.h
@@ -73,4 +73,6 @@ uint32_t CRC4Legic(uint8_t *buff, size_t size);
 // Calculate CRC-8/Legic checksum
 uint32_t CRC8Legic(uint8_t *buff, size_t size);
 
+// Calculate CRC-8/Cardx checksum
+uint32_t CRC8Cardx(uint8_t *buff, size_t size);
 #endif /* __CRC_H */