Standard test vector
CRC implementations are commonly verified with the ASCII input 123456789.
- Input format
- ASCII
- Input
- 123456789
- Expected CRC
- 0xD0
- Residue
- 0x00
CRC-8 / ROHC
Width8-bitRefInYesRefOutYesInput data9 bytesUTF-8 bytesText is converted to UTF-8 bytes.
Standard test string
Result
Similar CRC Algorithms
5 modelsBrowse all algorithms
Result is calculated from the current input. Check is the published verification value for the standard input 123456789. Click another algorithm to view its detail page.
CRC-8 / BLUETOOTH
8-bitPoly 0xA7In Yes Out Yes
Result
0x26
Check
0x26
CRC-8 / I-432-1
8-bitPoly 0x07In No Out No
Result
0xA1
Check
0xA1
CRC-8 / ROHC Current
8-bitPoly 0x07In Yes Out Yes
Result
0xD0
Check
0xD0
CRC-8 / SMBUS
8-bitPoly 0x07In No Out No
Result
0xF4
Check
0xF4
CRC-8 / TECH-3250
8-bitPoly 0x1DIn Yes Out Yes
Result
0x97
Check
0x97
CRC Lookup Table
CRC-8 / ROHC · Poly 0x07 · Init 0xFF · XorOut 0x00 · 256 entries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 Source Code
CRC-8 / ROHC · Poly 0x07 · Init 0xFF · XorOut 0x00 · C · 56 lines
/*
* Model: CRC-8 / ROHC (8-bit)
* Poly: 0x07, Init: 0xFF, XorOut: 0x00
* CRC Table C Source Code & Lookup Table Generator
*/
#include <stdint.h>
#include <stddef.h>
const uint8_t crc_table[256] = {
0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75,
0x0E, 0x9F, 0xED, 0x7C, 0x09, 0x98, 0xEA, 0x7B,
0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A, 0xF8, 0x69,
0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67,
0x38, 0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D,
0x36, 0xA7, 0xD5, 0x44, 0x31, 0xA0, 0xD2, 0x43,
0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0, 0x51,
0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F,
0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05,
0x7E, 0xEF, 0x9D, 0x0C, 0x79, 0xE8, 0x9A, 0x0B,
0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA, 0x88, 0x19,
0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17,
0x48, 0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D,
0x46, 0xD7, 0xA5, 0x34, 0x41, 0xD0, 0xA2, 0x33,
0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0, 0x21,
0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F,
0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95,
0xEE, 0x7F, 0x0D, 0x9C, 0xE9, 0x78, 0x0A, 0x9B,
0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A, 0x18, 0x89,
0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87,
0xD8, 0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD,
0xD6, 0x47, 0x35, 0xA4, 0xD1, 0x40, 0x32, 0xA3,
0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20, 0xB1,
0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF,
0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5,
0x9E, 0x0F, 0x7D, 0xEC, 0x99, 0x08, 0x7A, 0xEB,
0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A, 0x68, 0xF9,
0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7,
0xA8, 0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD,
0xA6, 0x37, 0x45, 0xD4, 0xA1, 0x30, 0x42, 0xD3,
0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1,
0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF
};
uint8_t calculate_crc(const uint8_t *data, size_t length) {
uint8_t crc = 0xFF;
for (size_t i = 0; i < length; i++) {
#if 1
uint8_t idx = (uint8_t)(crc ^ data[i]);
crc = (crc >> 8) ^ crc_table[idx];
#else
uint8_t idx = (uint8_t)((crc >> 0) ^ data[i]);
crc = (crc << 8) ^ crc_table[idx];
#endif
}
return crc ^ 0x00;
}About CRC-8/ROHC
CRC-8/ROHC is a reflected CRC used by Robust Header Compression.
CRC-8/ROHC is a 8-bit CRC model defined by polynomial 0x07, an initial register value of 0xFF, and final XOR 0x00. It processes reflected input bytes and reports a reflected output.
Documented application context for this model includes ROHC, IP header compression, Mobile networks. The calculator above applies this exact parameter set to the current input; the published Check value below is instead the fixed verification result for ASCII 123456789.
Model characteristics
A model is identified by its complete parameter set, not its polynomial alone.
- Bit order
- Reflected
- Register start
- 0xFF
- Final XOR
- 0x00
- Published check
- 0xD0
Implementation checks for CRC-8/ROHC
- Use a 8-bit register and polynomial 0x07.
- Initialize the register to 0xFF and use XorOut 0x00 exactly as listed; changing either value defines a different model.
- Verify the implementation with ASCII “123456789”; the expected result is 0xD0.
Continue with the main calculator, browse the algorithm catalog, compare models in the Algorithm Reference section, or generate a lookup table.
Complete CRC-8/ROHC parameters
| Parameter | Value | Meaning | Reference |
|---|---|---|---|
| Width | 8 bits | CRC register and result width | Read guide |
| Poly | 0x07 | Generator polynomial without the leading term | Read guide |
| Init | 0xFF | Initial CRC register value | Read guide |
| RefIn | Yes | Reflect each input byte before processing | Read guide |
| RefOut | Yes | Reflect the register before XOR Out | Read guide |
| XorOut | 0x00 | Final value XORed with the CRC register | Read guide |
| Check | 0xD0 | CRC of ASCII “123456789” | Read guide |
| Residue | 0x00 | Expected residue after appending a valid CRC | Read guide |
AliasesROHC CRC-8
Where CRC-8/ROHC is used
- 01ROHC
- 02IP header compression
- 03Mobile networks
CRC-8/ROHC FAQ
What is the check value for CRC-8/ROHC?
For the standard ASCII test input 123456789, the check value of CRC-8/ROHC is 0xD0.
What polynomial does CRC-8/ROHC use?
CRC-8/ROHC uses the 8-bit polynomial 0x07.
Does CRC-8/ROHC use reflected input and output?
For CRC-8/ROHC, RefIn is Yes and RefOut is Yes.
What is CRC-8/ROHC commonly confused with?
CRC-8/SMBUS uses the same polynomial (0x07), which is the usual source of mix-ups — matching the polynomial alone does not reproduce CRC-8/ROHC. The two models differ in initial value, input reflection, and output reflection, so a port from one to the other needs those fields checked explicitly, not just the poly.