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hash.go
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hash.go
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// Copyright 2023 sigma
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package hash
import (
"crypto/md5" // nolint: gosec
"crypto/sha1" // nolint: gosec
"crypto/sha256"
"crypto/sha512"
"encoding/hex"
"errors"
"fmt"
"hash"
"io"
"os"
"strings"
)
// ErrNoSuchFile ...
var ErrNoSuchFile = errors.New("no such file")
func isFile(filePath string) bool {
f, e := os.Stat(filePath)
if e != nil {
return false
}
return !f.IsDir()
}
func selectMethod(method []string) hash.Hash {
if len(method) == 1 {
switch strings.ToLower(method[0]) {
case "md5":
return md5.New() // nolint: gosec
case "sha1":
return sha1.New() // nolint: gosec
case "sha256":
return sha256.New()
case "sha512":
return sha512.New()
default:
return sha256.New()
}
}
return sha256.New()
}
// FileVerify 哈希校验一个文件,以 hex 的方式校验,method 支持:md5,sha1,sha256(默认),sha512
func FileVerify(file, hash string, method ...string) (verify bool, err error) {
if !isFile(file) {
err = ErrNoSuchFile
return
}
var fileObj *os.File
if fileObj, err = os.Open(file); err != nil {
return
}
var data = make([]byte, cacheSize)
var n int
var h = selectMethod(method)
for {
n, err = fileObj.Read(data)
if n != 0 {
if _, err = h.Write(data[:n]); err != nil {
return
}
}
if err == io.EOF {
err = nil
break
}
if err != nil {
return
}
}
verify = hex.EncodeToString(h.Sum(nil)) == hash
return
}
// String 哈希一个字符串,输出 hex 的编码,method 支持:md5,sha1,sha256(默认),sha512
func String(str string, method ...string) (hash string, err error) {
var h = selectMethod(method)
if _, err = h.Write([]byte(str)); err != nil {
return
}
hash = hex.EncodeToString(h.Sum(nil))
return
}
// MustString ...
func MustString(str string, method ...string) string {
hash, err := String(str, method...)
if err != nil {
panic(fmt.Sprintf("hash string failed: %v", err))
}
return hash
}
// File 哈希一个文件,输出 hex 的编码,method 支持:md5,sha1,sha256(默认),sha512
func File(file string, method ...string) (hash string, err error) {
if !isFile(file) {
err = ErrNoSuchFile
return
}
var fileObj *os.File
if fileObj, err = os.Open(file); err != nil {
return
}
var data = make([]byte, cacheSize)
var n int
var h = selectMethod(method)
for {
n, err = fileObj.Read(data)
if n != 0 {
if _, err = h.Write(data[:n]); err != nil {
return
}
}
if err == io.EOF {
err = nil
break
}
if err != nil {
return
}
}
hash = hex.EncodeToString(h.Sum(nil))
return
}
const (
cacheSize = 10240
)
// Reader ...
func Reader(reader io.Reader, method ...string) (hash string, err error) {
var h = selectMethod(method)
var data = make([]byte, cacheSize)
var n int
for {
n, err = reader.Read(data)
if n != 0 {
if _, err = h.Write(data[:n]); err != nil {
return
}
}
if err == io.EOF {
err = nil
break
}
if err != nil {
return
}
}
hash = hex.EncodeToString(h.Sum(nil))
return
}