/** **************************************************************************************** * * @file CRCxx.c * * @brief Common CRC bitwise operation functions. * could verify at http://www.ip33.com/crc.html * **************************************************************************************** */ #include #include #include "CRCxx.h" /****************************************************************************** * Name: CRC-4/ITU * Poly: 0x03 ( x4+x+1 ) * Init: 0x00 * Refin: True * Refout: True * Xorout: 0x00 *****************************************************************************/ uint8_t crc4_itu(uint8_t *data, ulen_t length) { uint8_t i; uint8_t crc = 0; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0x0C; // 0x0C = (reverse 0x03)>>(8-4) else crc = (crc >> 1); } } return crc; } /****************************************************************************** * Name: CRC-5/EPC * Poly: 0x09 ( x5+x3+1 ) * Init: 0x09 * Refin: False * Refout: False * Xorout: 0x00 *****************************************************************************/ uint8_t crc5_epc(uint8_t *data, ulen_t length) { uint8_t i; uint8_t crc = 0x48; // Initial value: 0x48 = 0x09<<(8-5) while (length--) { crc ^= *data++; for ( i = 0; i < 8; i++ ) { if ( crc & 0x80 ) crc = (crc << 1) ^ 0x48; // 0x48 = 0x09<<(8-5) else crc <<= 1; } } return crc >> 3; } /****************************************************************************** * Name: CRC-5/ITU * Poly: 0x15 ( x5+x4+x2+1 ) * Init: 0x00 * Refin: True * Refout: True * Xorout: 0x00 *****************************************************************************/ uint8_t crc5_itu(uint8_t *data, ulen_t length) { uint8_t i; uint8_t crc = 0; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0x15; // 0x15 = (reverse 0x15)>>(8-5) else crc = (crc >> 1); } } return crc; } /****************************************************************************** * Name: CRC-5/USB * Poly: 0x05 ( x5+x2+1 ) * Init: 0x1F * Refin: True * Refout: True * Xorout: 0x1F *****************************************************************************/ uint8_t crc5_usb(uint8_t *data, ulen_t length) { uint8_t i; uint8_t crc = 0x1F; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0x14; // 0x14 = (reverse 0x05)>>(8-5) else crc = (crc >> 1); } } return crc ^ 0x1F; } /****************************************************************************** * Name: CRC-6/ITU * Poly: 0x03 ( x6+x+1 ) * Init: 0x00 * Refin: True * Refout: True * Xorout: 0x00 *****************************************************************************/ uint8_t crc6_itu(uint8_t *data, ulen_t length) { uint8_t i; uint8_t crc = 0; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0x30; // 0x30 = (reverse 0x03)>>(8-6) else crc = (crc >> 1); } } return crc; } /****************************************************************************** * Name: CRC-7/MMC * Poly: 0x09 ( x7+x3+1 ) * Init: 0x00 * Refin: False * Refout: False * Xorout: 0x00 * Use: MultiMediaCard,SD,ect. *****************************************************************************/ uint8_t crc7_mmc(uint8_t *data, ulen_t length) { uint8_t i; uint8_t crc = 0; // Initial value while (length--) { crc ^= *data++; for ( i = 0; i < 8; i++ ) { if ( crc & 0x80 ) crc = (crc << 1) ^ 0x12; // 0x12 = 0x09<<(8-7) else crc <<= 1; } } return crc >> 1; } /****************************************************************************** * Name: CRC-8 * Poly: 0x07 ( x8+x2+x+1 ) * Init: 0x00 * Refin: False * Refout: False * Xorout: 0x00 *****************************************************************************/ uint8_t crc8(uint8_t *data, ulen_t length) { uint8_t i; uint8_t crc = 0; // Initial value while (length--) { crc ^= *data++; for ( i = 0; i < 8; i++ ) { if ( crc & 0x80 ) crc = (crc << 1) ^ 0x07; else crc <<= 1; } } return crc; } /****************************************************************************** * Name: CRC-8/ITU * Poly: 0x07 ( x8+x2+x+1 ) * Init: 0x00 * Refin: False * Refout: False * Xorout: 0x55 * Alias: CRC-8/ATM *****************************************************************************/ uint8_t crc8_itu(uint8_t *data, ulen_t length) { uint8_t i; uint8_t crc = 0; // Initial value while (length--) { crc ^= *data++; for ( i = 0; i < 8; i++ ) { if ( crc & 0x80 ) crc = (crc << 1) ^ 0x07; else crc <<= 1; } } return crc ^ 0x55; } /****************************************************************************** * Name: CRC-8/ROHC * Poly: 0x07 ( x8+x2+x+1 ) * Init: 0xFF * Refin: True * Refout: True * Xorout: 0x00 *****************************************************************************/ uint8_t crc8_rohc(uint8_t *data, ulen_t length) { uint8_t i; uint8_t crc = 0xFF; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0xE0; // 0xE0 = reverse 0x07 else crc = (crc >> 1); } } return crc; } /****************************************************************************** * Name: CRC-8/MAXIM * Poly: 0x31 ( x8+x5+x4+1 ) * Init: 0x00 * Refin: True * Refout: True * Xorout: 0x00 * Alias: DOW-CRC,CRC-8/IBUTTON * Use: Maxim(Dallas)'s some devices,e.g. DS18B20 *****************************************************************************/ uint8_t crc8_maxim(uint8_t *data, ulen_t length) { uint8_t i; uint8_t crc = 0; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; i++) { if (crc & 1) crc = (crc >> 1) ^ 0x8C; // 0x8C = reverse 0x31 else crc >>= 1; } } return crc; } /****************************************************************************** * Name: CRC-16 * Poly: 0x8005 ( x16+x15+x2+1 ) * Init: 0x0000 * Refin: True * Refout: True * Xorout: 0x0000 * Alias: CRC-16/IBM,CRC-16/ARC,CRC-16/LHA *****************************************************************************/ uint16_t crc16(uint8_t *data, ulen_t length) { uint8_t i; uint16_t crc = 0; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0xA001; // 0xA001 = reverse 0x8005 else crc = (crc >> 1); } } return crc; } /****************************************************************************** * Name: CRC-16/MAXIM * Poly: 0x8005 ( x16+x15+x2+1 ) * Init: 0x0000 * Refin: True * Refout: True * Xorout: 0xFFFF *****************************************************************************/ uint16_t crc16_maxim(uint8_t *data, ulen_t length) { uint8_t i; uint16_t crc = 0; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0xA001; // 0xA001 = reverse 0x8005 else crc = (crc >> 1); } } return ~crc; // crc^0xffff } /****************************************************************************** * Name: CRC-16/USB * Poly: 0x8005 ( x16+x15+x2+1 ) * Init: 0xFFFF * Refin: True * Refout: True * Xorout: 0xFFFF *****************************************************************************/ uint16_t crc16_usb(uint8_t *data, ulen_t length) { uint8_t i; uint16_t crc = 0xffff; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0xA001; // 0xA001 = reverse 0x8005 else crc = (crc >> 1); } } return ~crc; // crc^0xffff } /****************************************************************************** * Name: CRC-16/MODBUS * Poly: 0x8005 ( x16+x15+x2+1 ) * Init: 0xFFFF * Refin: True * Refout: True * Xorout: 0x0000 *****************************************************************************/ uint16_t crc16_modbus(uint8_t *data, ulen_t length) { uint8_t i; uint16_t crc = 0xffff; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0xA001; // 0xA001 = reverse 0x8005 else crc = (crc >> 1); } } return crc; } /****************************************************************************** * Name: CRC-16/CCITT * Poly: 0x1021 ( x16+x12+x5+1 ) * Init: 0x0000 * Refin: True * Refout: True * Xorout: 0x0000 * Alias: CRC-CCITT,CRC-16/CCITT-TRUE,CRC-16/KERMIT *****************************************************************************/ uint16_t crc16_ccitt(uint8_t *data, ulen_t length) { uint8_t i; uint16_t crc = 0; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0x8408; // 0x8408 = reverse 0x1021 else crc = (crc >> 1); } } return crc; } /****************************************************************************** * Name: CRC-16/CCITT-FALSE * Poly: 0x1021 ( x16+x12+x5+1 ) * Init: 0xFFFF * Refin: False * Refout: False * Xorout: 0x0000 *****************************************************************************/ uint16_t crc16_ccitt_false(uint8_t *data, ulen_t length) { uint8_t i; uint16_t crc = 0xffff; // Initial value while (length--) { crc ^= (uint16_t)(*data++) << 8; for (i = 0; i < 8; ++i) { if ( crc & 0x8000 ) crc = (crc << 1) ^ 0x1021; else crc <<= 1; } } return crc; } /****************************************************************************** * Name: CRC-16/X25 * Poly: 0x1021 ( x16+x12+x5+1 ) * Init: 0xFFFF * Refin: True * Refout: True * Xorout: 0XFFFF *****************************************************************************/ uint16_t crc16_x25(uint8_t *data, ulen_t length) { uint8_t i; uint16_t crc = 0xffff; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0x8408; // 0x8408 = reverse 0x1021 else crc = (crc >> 1); } } return ~crc; // crc^Xorout } /****************************************************************************** * Name: CRC-16/XMODEM * Poly: 0x1021 ( x16+x12+x5+1 ) * Init: 0x0000 * Refin: False * Refout: False * Xorout: 0x0000 * Alias: CRC-16/ZMODEM,CRC-16/ACORN *****************************************************************************/ uint16_t crc16_xmodem(uint8_t *data, ulen_t length) { uint8_t i; uint16_t crc = 0; // Initial value while (length--) { crc ^= (uint16_t)(*data++) << 8; for (i = 0; i < 8; ++i) { if ( crc & 0x8000 ) crc = (crc << 1) ^ 0x1021; else crc <<= 1; } } return crc; } /****************************************************************************** * Name: CRC-16/DNP * Poly: 0x3D65 ( x16+x13+x12+x11+x10+x8+x6+x5+x2+1 ) * Init: 0x0000 * Refin: True * Refout: True * Xorout: 0xFFFF * Use: M-Bus,ect. *****************************************************************************/ uint16_t crc16_dnp(uint8_t *data, ulen_t length) { uint8_t i; uint16_t crc = 0; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0xA6BC; // 0xA6BC = reverse 0x3D65 else crc = (crc >> 1); } } return ~crc; // crc^Xorout } /****************************************************************************** * Name: CRC-24 * Poly: 0x864CFB ( x24+x23+x18+x17+x14+x11+x10+x7+x6+x5+x4+x3+x1+1 ) * Init: 0xB704CE * Refin: True * Refout: True * Xorout: 0x000000 * Alias: CRC-24/OPENPGP *****************************************************************************/ uint32_t crc24(uint8_t *data, ulen_t length) { uint8_t i; uint32_t crc = 0x7320ED; // Initial value: 0x7320ED = revbit24(0xB704CE) while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0xDF3261; // 0xDF3261 = revbit24(0x864CFB) else crc = (crc >> 1); } } return crc; } /****************************************************************************** * Name: CRC-24/BLE * Poly: 0x00065B ( x24+x10+x9+x6+x4+x3+x1+1 ) * Init: 0x555555 * Refin: True * Refout: True * Xorout: 0x000000 *****************************************************************************/ uint32_t crc24_ble(uint8_t *data, ulen_t length) { uint8_t i; uint32_t crc = 0xAAAAAA; // Initial value: 0xAAAAAA = revbit24(0x555555) while (length--) { crc ^= *data++; for (i = 0; i < 8; i++) { if (crc & 1) crc = (crc >> 1) ^ 0xDA6000; // 0xDA6000 = revbit24(0x00065b) else crc = (crc >> 1); } } return crc; } /****************************************************************************** * Name: CRC-24/FLEXRAY-A * Poly: 0x5D6DCB ( x24+x22+x20+x19+x18+x16+x14+x13+x11+x10+x8+x7+x6+x3+x1+1 ) * Init: 0xFEDCBA * Refin: True * Refout: True * Xorout: 0x000000 *****************************************************************************/ uint32_t crc24_flexraya(uint8_t *data, ulen_t length) { uint8_t i; uint32_t crc = 0x5D3B7F; // Initial value: 0x5D3B7F = revbit24(0xFEDCBA) while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0xD3B6BA; // 0xD3B6BA = revbit24(0x5D6DCB) else crc = (crc >> 1); } } return crc; } /****************************************************************************** * Name: CRC-24/FLEXRAY-B * Poly: 0x5D6DCB ( x24+x22+x20+x19+x18+x16+x14+x13+x11+x10+x8+x7+x6+x3+x1+1 ) * Init: 0xABCDEF * Refin: True * Refout: True * Xorout: 0x000000 *****************************************************************************/ uint32_t crc24_flexrayb(uint8_t *data, ulen_t length) { uint8_t i; uint32_t crc = 0xF7B3D5; // Initial value: 0xF7B3D5 = revbit24(0xABCDEF) while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0xD3B6BA; // 0xD3B6BA = revbit24(0x5D6DCB) else crc = (crc >> 1); } } return crc; } /****************************************************************************** * Name: CRC-24/LTE-A * Poly: 0x864CFB ( x24+x23+x18+x17+x14+x11+x10+x7+x6+x5+x4+x3+x1+1 ) * Init: 0x000000 * Refin: False * Refout: False * Xorout: 0x000000 *****************************************************************************/ uint32_t crc24_lte_a(uint8_t *data, ulen_t length) { uint8_t i; uint32_t crc = 0x000000; // Initial value while (length--) { crc ^= (uint32_t)(*data++) << 16; for (i = 0; i < 8; ++i) { if ( crc & 0x800000 ) crc = (crc << 1) ^ 0x864CFB; else crc <<= 1; } } return (crc & 0xFFFFFF); } /****************************************************************************** * Name: CRC-24/LTE-B * Poly: 0x800063 ( x24+x23+x6+x5+x1+1 ) * Init: 0x000000 * Refin: False * Refout: False * Xorout: 0x000000 *****************************************************************************/ uint32_t crc24_lte_b(uint8_t *data, ulen_t length) { uint8_t i; uint32_t crc = 0x000000; // Initial value while (length--) { crc ^= (uint32_t)(*data++) << 16; for (i = 0; i < 8; ++i) { if ( crc & 0x800000 ) crc = (crc << 1) ^ 0x800063; else crc <<= 1; } } return (crc & 0xFFFFFF); } /****************************************************************************** * Name: CRC-24/OS-9 * Poly: 0x800063 ( x24+x23+x6+x5+x1+1 ) * Init: 0xFFFFFF * Refin: False * Refout: False * Xorout: 0xFFFFFF *****************************************************************************/ uint32_t crc24_os9(uint8_t *data, ulen_t length) { uint8_t i; uint32_t crc = 0xFFFFFF; // Initial value while (length--) { crc ^= (uint32_t)(*data++) << 16; for (i = 0; i < 8; ++i) { if ( crc & 0x800000 ) crc = (crc << 1) ^ 0x800063; else crc <<= 1; } } return (crc & 0xFFFFFF) ^ 0xFFFFFF; } /****************************************************************************** * Name: CRC-24/INTERLAKEN * Poly: 0x328B63 ( x24+x21+x20+x17+x15+x11+x9+x8+x6+x5+x1+1 ) * Init: 0xFFFFFF * Refin: False * Refout: False * Xorout: 0xFFFFFF *****************************************************************************/ uint32_t crc24_interlaken(uint8_t *data, ulen_t length) { uint8_t i; uint32_t crc = 0xFFFFFF; // Initial value while (length--) { crc ^= (uint32_t)(*data++) << 16; for (i = 0; i < 8; ++i) { if ( crc & 0x800000 ) crc = (crc << 1) ^ 0x328B63; else crc <<= 1; } } return (crc & 0xFFFFFF) ^ 0xFFFFFF; } /****************************************************************************** * Name: CRC-32 * Poly: 0x4C11DB7 ( x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+1 ) * Init: 0xFFFFFFF * Refin: True * Refout: True * Xorout: 0xFFFFFFF * Alias: CRC_32/ADCCP * Use: WinRAR,ect. *****************************************************************************/ uint32_t crc32(uint8_t *data, ulen_t length) { uint8_t i; uint32_t crc = 0xffffffff; // Initial value while (length--) { crc ^= *data++; for (i = 0; i < 8; ++i) { if (crc & 1) crc = (crc >> 1) ^ 0xEDB88320; // 0xEDB88320= reverse 0x04C11DB7 else crc = (crc >> 1); } } return ~crc; } /****************************************************************************** * Name: CRC-32/MPEG-2 * Poly: 0x4C11DB7 ( x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+1 ) * Init: 0xFFFFFFF * Refin: False * Refout: False * Xorout: 0x0000000 *****************************************************************************/ uint32_t crc32_mpeg2(uint8_t *data, ulen_t length) { uint8_t i; uint32_t crc = 0xffffffff; // Initial value while(length--) { crc ^= (uint32_t)(*data++) << 24; for (i = 0; i < 8; ++i) { if ( crc & 0x80000000 ) crc = (crc << 1) ^ 0x04C11DB7; else crc <<= 1; } } return crc; }