diff --git a/hash/crc16/crc16.go b/hash/crc16/crc16.go
index b27a9bb..5d84f7f 100644
--- a/hash/crc16/crc16.go
+++ b/hash/crc16/crc16.go
@@ -10,18 +10,28 @@ import (
 	"github.com/howeyc/crc16"
 )
 
+type CRC16Mode int
+
+const (
+	CCITT CRC16Mode = iota
+	CCITT_FALSE
+	SCSI
+	IBM
+	MBUS
+)
+
 // 根据给定的校验表类型生成对应的校验器
-func hasherSelect(table string) crc16.Hash16 {
-	switch table {
-	case "CCITT":
+func hasherSelect(mdoe CRC16Mode) crc16.Hash16 {
+	switch mdoe {
+	case CCITT:
 		return crc16.NewCCITT()
-	case "CCITT-FALSE":
+	case CCITT_FALSE:
 		return crc16.New(crc16.MakeTable(crc16.CCITTFalse))
-	case "SCSI":
+	case SCSI:
 		return crc16.NewSCSI()
-	case "IBM":
+	case IBM:
 		return crc16.NewIBM()
-	case "MBUS":
+	case MBUS:
 		return crc16.New(crc16.MakeTable(crc16.MBUS))
 	default:
 		return crc16.NewIBM()
@@ -29,27 +39,27 @@ func hasherSelect(table string) crc16.Hash16 {
 }
 
 // 计算给定字节数组的CRC16校验和，返回字节数组
-func CRC16(data []byte, table ...string) []byte {
-	crcTable := append(table, "IBM")
+func CRC16(data []byte, mode ...CRC16Mode) []byte {
+	crcTable := append(mode, IBM)
 	hasher := hasherSelect(crcTable[0])
 	hasher.Write(data)
 	return hasher.Sum(nil)
 }
 
 // 计算给定字节数组的CRC16校验和，返回十六进制字符串
-func CRC16Hex(data []byte, table ...string) string {
-	return hex.EncodeToString(CRC16(data, table...))
+func CRC16Hex(data []byte, mode ...CRC16Mode) string {
+	return hex.EncodeToString(CRC16(data, mode...))
 }
 
 // 计算指定文件的CRC16校验和，返回字节数组
-func SumFile(file string, table ...string) ([]byte, error) {
+func SumFile(file string, mode ...CRC16Mode) ([]byte, error) {
 	f, err := os.Open(file)
 	if err != nil {
 		return nil, fmt.Errorf("未能打开指定文件，%w", err)
 	}
 	defer f.Close()
 
-	crcTable := append(table, "IBM")
+	crcTable := append(mode, IBM)
 	hasher := hasherSelect(crcTable[0])
 	if _, err := io.Copy(hasher, f); err != nil {
 		return nil, fmt.Errorf("未能读取指定文件的内容，%w", err)
@@ -58,8 +68,8 @@ func SumFile(file string, table ...string) ([]byte, error) {
 }
 
 // 计算指定文件的CRC16校验和，返回十六进制字符串
-func SumFileHex(file string, table ...string) (string, error) {
-	hash, err := SumFile(file, table...)
+func SumFileHex(file string, mode ...CRC16Mode) (string, error) {
+	hash, err := SumFile(file, mode...)
 	if err != nil {
 		return "", err
 	}
diff --git a/hash/crc32/crc32.go b/hash/crc32/crc32.go
index b86a0dd..6ab36e9 100644
--- a/hash/crc32/crc32.go
+++ b/hash/crc32/crc32.go
@@ -9,14 +9,22 @@ import (
 	"os"
 )
 
+type CRC32Mode int
+
+const (
+	IEEE CRC32Mode = iota
+	Castagnoli
+	Koopman
+)
+
 // 选择一个CRC32校验表
-func tableSelect(table string) *crc32.Table {
-	switch table {
-	case "IEEE":
+func tableSelect(mode CRC32Mode) *crc32.Table {
+	switch mode {
+	case IEEE:
 		return crc32.IEEETable
-	case "Castagnoli":
+	case Castagnoli:
 		return crc32.MakeTable(crc32.Castagnoli)
-	case "Koopman":
+	case Koopman:
 		return crc32.MakeTable(crc32.Koopman)
 	default:
 		return crc32.IEEETable
@@ -24,27 +32,27 @@ func tableSelect(table string) *crc32.Table {
 }
 
 // 计算给定字节数组的CRC32校验和，返回字节数组
-func CRC32(data []byte, table ...string) []byte {
-	crcTable := append(table, "IEEE")
+func CRC32(data []byte, mode ...CRC32Mode) []byte {
+	crcTable := append(mode, IEEE)
 	hasher := crc32.New(tableSelect(crcTable[0]))
 	hasher.Write(data)
 	return hasher.Sum(nil)
 }
 
 // 计算给定字节数组的CRC32校验和，返回十六进制字符串
-func CRC32Hex(data []byte, table ...string) string {
-	return hex.EncodeToString(CRC32(data, table...))
+func CRC32Hex(data []byte, mode ...CRC32Mode) string {
+	return hex.EncodeToString(CRC32(data, mode...))
 }
 
 // 计算指定文件的CRC32校验和，返回字节数组
-func SumFile(file string, table ...string) ([]byte, error) {
+func SumFile(file string, mode ...CRC32Mode) ([]byte, error) {
 	f, err := os.Open(file)
 	if err != nil {
 		return nil, fmt.Errorf("未能打开指定文件，%w", err)
 	}
 	defer f.Close()
 
-	crcTable := append(table, "IEEE")
+	crcTable := append(mode, IEEE)
 	hasher := crc32.New(tableSelect(crcTable[0]))
 	if _, err := io.Copy(hasher, f); err != nil {
 		return nil, fmt.Errorf("未能读取指定文件的内容，%w", err)
@@ -53,8 +61,8 @@ func SumFile(file string, table ...string) ([]byte, error) {
 }
 
 // 计算指定文件的CRC32校验和，返回十六进制字符串
-func SumFileHex(file string, table ...string) (string, error) {
-	hash, err := SumFile(file, table...)
+func SumFileHex(file string, mode ...CRC32Mode) (string, error) {
+	hash, err := SumFile(file, mode...)
 	if err != nil {
 		return "", err
 	}
diff --git a/hash/crc64/crc64.go b/hash/crc64/crc64.go
index 973457c..1c7b2ab 100644
--- a/hash/crc64/crc64.go
+++ b/hash/crc64/crc64.go
@@ -9,12 +9,19 @@ import (
 	"os"
 )
 
+type CRC64Mode int
+
+const (
+	ECMA CRC64Mode = iota
+	ISO
+)
+
 // 选择一个CRC64校验表。
-func tableSelect(table string) *crc64.Table {
-	switch table {
-	case "ECMA":
+func tableSelect(mode CRC64Mode) *crc64.Table {
+	switch mode {
+	case ECMA:
 		return crc64.MakeTable(crc64.ECMA)
-	case "ISO":
+	case ISO:
 		return crc64.MakeTable(crc64.ISO)
 	default:
 		return crc64.MakeTable(crc64.ISO)
@@ -22,27 +29,27 @@ func tableSelect(table string) *crc64.Table {
 }
 
 // 计算给定字节数组的CRC64校验和，返回字节数组。
-func CRC64(data []byte, table ...string) []byte {
-	crcTable := append(table, "ISO")
+func CRC64(data []byte, mode ...CRC64Mode) []byte {
+	crcTable := append(mode, ISO)
 	hasher := crc64.New(tableSelect(crcTable[0]))
 	hasher.Write(data)
 	return hasher.Sum(nil)
 }
 
 // 计算给定字节数组的CRC64校验和，返回十六进制字符串。
-func CRC64Hex(data []byte, table ...string) string {
-	return hex.EncodeToString(CRC64(data, table...))
+func CRC64Hex(data []byte, mode ...CRC64Mode) string {
+	return hex.EncodeToString(CRC64(data, mode...))
 }
 
 // 计算一个指定文件的CRC64校验和，返回字节数组。
-func SumFile(file string, table ...string) ([]byte, error) {
+func SumFile(file string, mode ...CRC64Mode) ([]byte, error) {
 	f, err := os.Open(file)
 	if err != nil {
 		return nil, fmt.Errorf("未能打开指定文件，%w", err)
 	}
 	defer f.Close()
 
-	crcTable := append(table, "ISO")
+	crcTable := append(mode, ISO)
 	hasher := crc64.New(tableSelect(crcTable[0]))
 	if _, err := io.Copy(hasher, f); err != nil {
 		return nil, fmt.Errorf("未能读取指定文件的内容，%w", err)
@@ -51,8 +58,8 @@ func SumFile(file string, table ...string) ([]byte, error) {
 }
 
 // 计算一个指定文件的CRC64校验和，返回十六进制字符串。
-func SumFileHex(file string, table ...string) (string, error) {
-	hash, err := SumFile(file, table...)
+func SumFileHex(file string, mode ...CRC64Mode) (string, error) {
+	hash, err := SumFile(file, mode...)
 	if err != nil {
 		return "", err
 	}
diff --git a/hash/crc8/crc8.go b/hash/crc8/crc8.go
index 3e13262..31014f1 100644
--- a/hash/crc8/crc8.go
+++ b/hash/crc8/crc8.go
@@ -9,28 +9,43 @@ import (
 	"github.com/sigurn/crc8"
 )
 
+type CRC8Mode int
+
+const (
+	ORIGIN CRC8Mode = iota
+	CDMA2000
+	DARC
+	DVB_S2
+	EBU
+	I_CODE
+	ITU
+	MAXIM
+	ROHC
+	WCDMA
+)
+
 // 根据提供的校验表名称生成对应的校验表
-func hasherSelect(table string) *crc8.Table {
-	switch table {
-	case "CRC8":
+func hasherSelect(mode CRC8Mode) *crc8.Table {
+	switch mode {
+	case ORIGIN:
 		return crc8.MakeTable(crc8.CRC8)
-	case "CDMA2000":
+	case CDMA2000:
 		return crc8.MakeTable(crc8.CRC8_CDMA2000)
-	case "DARC":
+	case DARC:
 		return crc8.MakeTable(crc8.CRC8_DARC)
-	case "DVB-S2":
+	case DVB_S2:
 		return crc8.MakeTable(crc8.CRC8_DVB_S2)
-	case "EBU":
+	case EBU:
 		return crc8.MakeTable(crc8.CRC8_EBU)
-	case "I-CODE":
+	case I_CODE:
 		return crc8.MakeTable(crc8.CRC8_I_CODE)
-	case "ITU":
+	case ITU:
 		return crc8.MakeTable(crc8.CRC8_ITU)
-	case "MAXIM":
+	case MAXIM:
 		return crc8.MakeTable(crc8.CRC8_MAXIM)
-	case "ROHC":
+	case ROHC:
 		return crc8.MakeTable(crc8.CRC8_ROHC)
-	case "WCDMA":
+	case WCDMA:
 		return crc8.MakeTable(crc8.CRC8_WCDMA)
 	default:
 		return crc8.MakeTable(crc8.CRC8)
@@ -38,25 +53,25 @@ func hasherSelect(table string) *crc8.Table {
 }
 
 // 计算给定字节数组的CRC8校验和，返回字节数组
-func CRC8(data []byte, table ...string) []byte {
-	crcTable := append(table, "CRC8")
+func CRC8(data []byte, mode ...CRC8Mode) []byte {
+	crcTable := append(mode, ORIGIN)
 	return []byte{crc8.Checksum(data, hasherSelect(crcTable[0]))}
 }
 
 // 计算给定字节数组的CRC8校验和，返回十六进制字符串
-func CRC8Hex(data []byte, table ...string) string {
-	return hex.EncodeToString(CRC8(data, table...))
+func CRC8Hex(data []byte, mode ...CRC8Mode) string {
+	return hex.EncodeToString(CRC8(data, mode...))
 }
 
 // 计算指定文件的CRC8校验和，返回字节数组
-func SumFile(file string, table ...string) ([]byte, error) {
+func SumFile(file string, mode ...CRC8Mode) ([]byte, error) {
 	f, err := os.Open(file)
 	if err != nil {
 		return nil, fmt.Errorf("未能打开指定文件，%w", err)
 	}
 	defer f.Close()
 
-	crcTable := append(table, "CRC8")
+	crcTable := append(mode, ORIGIN)
 	var buf = make([]byte, 0)
 	if _, err := f.Read(buf); err != nil {
 		return nil, fmt.Errorf("读取指定文件内容出错，%w", err)
@@ -65,8 +80,8 @@ func SumFile(file string, table ...string) ([]byte, error) {
 }
 
 // 计算指定文件的CRC8校验和，返回十六进制字符串
-func SumFileHex(file string, table ...string) (string, error) {
-	crc, err := SumFile(file, table...)
+func SumFileHex(file string, mode ...CRC8Mode) (string, error) {
+	crc, err := SumFile(file, mode...)
 	if err != nil {
 		return "", err
 	}