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ntool/ncrypt/md5.go

53 lines
953 B
Go

1 year ago
package ncrypt
import (
"bufio"
"crypto/md5"
"encoding/hex"
"fmt"
"git.noahlan.cn/noahlan/ntool/nbyte"
"io"
"os"
)
// Md5Bytes return the md5 value of bytes.
func Md5Bytes(b any) []byte {
return nbyte.Md5(b)
}
// Md5String return the md5 value of string.
func Md5String(s any) string {
return hex.EncodeToString(Md5Bytes(s))
}
// Md5File return the md5 value of file.
func Md5File(filename string) (string, error) {
if fileInfo, err := os.Stat(filename); err != nil {
return "", err
} else if fileInfo.IsDir() {
return "", nil
}
file, err := os.Open(filename)
if err != nil {
return "", err
}
defer file.Close()
hash := md5.New()
chunkSize := 65536
for buf, reader := make([]byte, chunkSize), bufio.NewReader(file); ; {
n, err := reader.Read(buf)
if err != nil {
if err == io.EOF {
break
}
return "", err
}
hash.Write(buf[:n])
}
checksum := fmt.Sprintf("%x", hash.Sum(nil))
return checksum, nil
}