go CRC 校验

最新推荐文章于 2025-03-06 13:58:44 发布

windows_oracle

最新推荐文章于 2025-03-06 13:58:44 发布

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分类专栏： GO 文章标签： go

本文链接：https://blog.youkuaiyun.com/windows_oracle/article/details/135674396

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文章介绍了CRC-8校验算法的两种实现方法，包括使用CRC8Table进行逐位计算和直接基于多项式进行累加异或，同时还有数据累加校验和异或校验函数的示例。

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后续不断补充完善


var UINT32_MAX uint32 = 0xFFFFFFFF

var crc8Table = []byte{
	0x00, 0x31, 0x62, 0x53, 0xc4, 0xf5, 0xa6, 0x97, 0xb9, 0x88, 0xdb, 0xea, 0x7d, 0x4c, 0x1f, 0x2e,
	0x43, 0x72, 0x21, 0x10, 0x87, 0xb6, 0xe5, 0xd4, 0xfa, 0xcb, 0x98, 0xa9, 0x3e, 0x0f, 0x5c, 0x6d,
	0x86, 0xb7, 0xe4, 0xd5, 0x42, 0x73, 0x20, 0x11, 0x3f, 0x0e, 0x5d, 0x6c, 0xfb, 0xca, 0x99, 0xa8,
	0xc5, 0xf4, 0xa7, 0x96, 0x01, 0x30, 0x63, 0x52, 0x7c, 0x4d, 0x1e, 0x2f, 0xb8, 0x89, 0xda, 0xeb,
	0x3d, 0x0c, 0x5f, 0x6e, 0xf9, 0xc8, 0x9b, 0xaa, 0x84, 0xb5, 0xe6, 0xd7, 0x40, 0x71, 0x22, 0x13,
	0x7e, 0x4f, 0x1c, 0x2d, 0xba, 0x8b, 0xd8, 0xe9, 0xc7, 0xf6, 0xa5, 0x94, 0x03, 0x32, 0x61, 0x50,
	0xbb, 0x8a, 0xd9, 0xe8, 0x7f, 0x4e, 0x1d, 0x2c, 0x02, 0x33, 0x60, 0x51, 0xc6, 0xf7, 0xa4, 0x95,
	0xf8, 0xc9, 0x9a, 0xab, 0x3c, 0x0d, 0x5e, 0x6f, 0x41, 0x70, 0x23, 0x12, 0x85, 0xb4, 0xe7, 0xd6,
	0x7a, 0x4b, 0x18, 0x29, 0xbe, 0x8f, 0xdc, 0xed, 0xc3, 0xf2, 0xa1, 0x90, 0x07, 0x36, 0x65, 0x54,
	0x39, 0x08, 0x5b, 0x6a, 0xfd, 0xcc, 0x9f, 0xae, 0x80, 0xb1, 0xe2, 0xd3, 0x44, 0x75, 0x26, 0x17,
	0xfc, 0xcd, 0x9e, 0xaf, 0x38, 0x09, 0x5a, 0x6b, 0x45, 0x74, 0x27, 0x16, 0x81, 0xb0, 0xe3, 0xd2,
	0xbf, 0x8e, 0xdd, 0xec, 0x7b, 0x4a, 0x19, 0x28, 0x06, 0x37, 0x64, 0x55, 0xc2, 0xf3, 0xa0, 0x91,
	0x47, 0x76, 0x25, 0x14, 0x83, 0xb2, 0xe1, 0xd0, 0xfe, 0xcf, 0x9c, 0xad, 0x3a, 0x0b, 0x58, 0x69,
	0x04, 0x35, 0x66, 0x57, 0xc0, 0xf1, 0xa2, 0x93, 0xbd, 0x8c, 0xdf, 0xee, 0x79, 0x48, 0x1b, 0x2a,
	0xc1, 0xf0, 0xa3, 0x92, 0x05, 0x34, 0x67, 0x56, 0x78, 0x49, 0x1a, 0x2b, 0xbc, 0x8d, 0xde, 0xef,
	0x82, 0xb3, 0xe0, 0xd1, 0x46, 0x77, 0x24, 0x15, 0x3b, 0x0a, 0x59, 0x68, 0xff, 0xce, 0x9d, 0xac,
}

func GetCRC8HighByTable(buf []byte) (val byte) {
	for i := len(buf) - 1; i >= 0; i-- {
		val = crc8Table[(val^buf[i])&0xff]
	}
	return val
}

// x^8+x^5+x^4+x^0
func GetCRC8High(buf []byte) (crc byte) {
	for i := len(buf) - 1; i >= 0; i-- {
		crc ^= buf[i]
		for j := 8; j > 0; j-- {
			if crc&0x80 > 0 {
				crc = (crc << 1) ^ 0x31
			} else {
				crc = crc << 1
			}
		}
	}

	return crc
}

func GetCRC8ByTable(data []byte) (val byte) {
	var crc byte = 0x00
	for _, b := range data {
		crc = crc8Table[crc^b]
	}

	return crc
}

func CalculateCRC8(data []byte) byte {
	poly := byte(0x31) // CRC-8多项式 x8+x5+x4+1
	crc := byte(0x00)
	for _, b := range data {
		crc ^= b
		for i := 0; i < 8; i++ {
			if (crc & 0x80) != 0 {
				crc = (crc << 1) ^ poly
			} else {
				crc <<= 1
			}
		}
	}
	return crc
}

// 采用8bit数据累加截取低32bit的校验法
func CalculateChecksum(data []byte) uint32 {
	sum := uint32(0)
	for _, b := range data {
		sum += uint32(b)
		// If the sum exceeds the maximum value of a uint32, wrap around.
		if sum > UINT32_MAX {
			sum &= UINT32_MAX
		}
	}
	return sum
}

// 校验字的取值是报文的所有字节，逐字节异或（除校验字本身），最后结果再取反
func CalChecksum(input []byte) byte {
	var result byte
	for _, b := range input {
		result ^= b
	}
	return ^result
}