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rand.go
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rand.go
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package kgo
import (
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"encoding/base64"
"errors"
"fmt"
"io"
"math/rand"
"os"
)
const (
allChars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
lenAllChars = len(allChars)
)
var (
ErrTooSmallSize = errors.New("the size of input value is small than requirement")
)
// RandPassword generates password randomly
func RandPassword(length int) string {
buf := make([]byte, length)
for i := 0; i < length; i++ {
buf[i] = allChars[rand.Intn(lenAllChars)]
}
return string(buf)
}
// GenKey ...
func GenKey(n int) string {
b, err := GenRawKey(n)
if err != nil {
Error(err)
return ""
}
return fmt.Sprintf("%02x", b)
}
// GenRawKey ...
func GenRawKey(n int) ([]byte, error) {
b := make([]byte, n)
_, err := rand.Read(b)
return b, err
}
// SHA256 creates hash value of data
func SHA256(data string) string {
h := sha256.New()
h.Write([]byte(data))
tmp := h.Sum(nil)
return base64.RawStdEncoding.EncodeToString(tmp)
}
// HashPassword ...
func HashPassword(pw, uname string) string {
return SHA256(pw + "a7}6r!pjt@+(B]7" + uname)
}
// RandInt ...
func RandInt(min, max int) int {
return rand.Intn(max-min) + min
}
// ComputeMD5Checksum computes the MD5 checksum of the file 'filename'
func ComputeMD5Checksum(filename string) (string, error) {
f, err := os.Open(filename)
if err != nil {
return "", err
}
defer f.Close()
h := md5.New()
if _, err := io.Copy(h, f); err != nil {
return "", err
}
return fmt.Sprintf("%x", h.Sum(nil)), nil
}
// ComputeSHA1Checksum computes the SHA1 checksum of the file 'filename'
func ComputeSHA1Checksum(filename string) (string, error) {
f, err := os.Open(filename)
if err != nil {
return "", err
}
defer f.Close()
h := sha1.New()
if _, err := io.Copy(h, f); err != nil {
return "", err
}
return fmt.Sprintf("%x", h.Sum(nil)), nil
}