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# crc-lib-c
基于C语言的CRC校验库，包括常用的21个CRC参数模型实现
#### 常用的CRC参数模型
| CRC算法名称 | 多项式公式 | WIDTH | POLY | INIT | XOROUT | REFIN | REFOUT |
| ------------------ | ------------------------------------------------------------ | ----- | -------- | -------- | -------- | ----- | ------ |
| CRC-4/ITU | x4 + x + 1 | 4 | 03 | 00 | 00 | TRUE | TRUE |
| CRC-5/EPC | x5 + x3 + 1 | 5 | 09 | 09 | 00 | FALSE | FALSE |
| CRC-5/ITU | x5 + x4 + x2 + 1 | 5 | 15 | 00 | 00 | TRUE | TRUE |
| CRC-5/USB | x5 + x2 + 1 | 5 | 05 | 1F | 1F | TRUE | TRUE |
| CRC-6/ITU | x6 + x + 1 | 6 | 03 | 00 | 00 | TRUE | TRUE |
| CRC-7/MMC | x7 + x3 + 1 | 7 | 09 | 00 | 00 | FALSE | FALSE |
| CRC-8 | x8 + x2 + x + 1 | 8 | 07 | 00 | 00 | FALSE | FALSE |
| CRC-8/ITU | x8 + x2 + x + 1 | 8 | 07 | 00 | 55 | FALSE | FALSE |
| CRC-8/ROHC | x8 + x2 + x + 1 | 8 | 07 | FF | 00 | TRUE | TRUE |
| CRC-8/MAXIM | x8 + x5 + x4 + 1 | 8 | 31 | 00 | 00 | TRUE | TRUE |
| CRC-16/IBM | x16 + x15 + x2 + 1 | 16 | 8005 | 0000 | 0000 | TRUE | TRUE |
| CRC-16/MAXIM | x16 + x15 + x2 + 1 | 16 | 8005 | 0000 | FFFF | TRUE | TRUE |
| CRC-16/USB | x16 + x15 + x2 + 1 | 16 | 8005 | FFFF | FFFF | TRUE | TRUE |
| CRC-16/MODBUS | x16 + x15 + x2 + 1 | 16 | 8005 | FFFF | 0000 | TRUE | TRUE |
| CRC-16/CCITT | x16 + x12 + x5 + 1 | 16 | 1021 | 0000 | 0000 | TRUE | TRUE |
| CRC-16/CCITT-FALSE | x16 + x12 + x5 + 1 | 16 | 1021 | FFFF | 0000 | FALSE | FALSE |
| CRC-16/X25 | x16 + x12 + x5 + 1 | 16 | 1021 | FFFF | FFFF | TRUE | TRUE |
| CRC-16/XMODEM | x16 + x12 + x5 + 1 | 16 | 1021 | 0000 | 0000 | FALSE | FALSE |
| CRC-16/DNP | x16 + x13 + x12 + x11 + x10 + x8 + x6 + x5 + x2 + 1 | 16 | 3D65 | 0000 | FFFF | TRUE | TRUE |
| CRC-32 | x32 + x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7 + x5 + x4 + x2 + x + 1 | 32 | 04C11DB7 | FFFFFFFF | FFFFFFFF | TRUE | TRUE |
| CRC-32/MPEG-2 | x32 + x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7 + x5 + x4 + x2 + x + 1 | 32 | 04C11DB7 | FFFFFFFF | 0 | FALSE | FALSE |
#### CRC计算工具
在线计算工具：www.ip33.com/crc.html
离线计算工具：
- CRC_Calc v0.1：http://xz.w10a.com/Small/CRCJISUANQI.zip
- 格西CRC计算器：http://www.geshe.com/home/products/GToolbox/bin/GCRC.exe