141 lines
2.9 KiB
Go
141 lines
2.9 KiB
Go
/*
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* Copyright 2022 The Dragonfly Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package digest
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import (
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"bufio"
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"crypto/md5"
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"crypto/sha1"
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"crypto/sha256"
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"crypto/sha512"
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"encoding/hex"
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"errors"
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"fmt"
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"hash"
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"io"
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"os"
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"strings"
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)
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const (
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// AlgorithmSHA1 is sha1 algorithm name of hash.
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AlgorithmSHA1 = "sha1"
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// AlgorithmSHA256 is sha256 algorithm name of hash.
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AlgorithmSHA256 = "sha256"
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// AlgorithmSHA512 is sha512 algorithm name of hash.
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AlgorithmSHA512 = "sha512"
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// AlgorithmMD5 is md5 algorithm name of hash.
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AlgorithmMD5 = "md5"
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)
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// Digest provides digest operation function.
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type Digest struct {
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// Algorithm is hash algorithm.
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Algorithm string
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// Encoded is hash encode.
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Encoded string
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}
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// HashFile computes hash value corresponding to algorithm.
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func HashFile(path string, algorithm string) (string, error) {
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f, err := os.Open(path)
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if err != nil {
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return "", err
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}
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defer f.Close()
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var h hash.Hash
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switch algorithm {
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case AlgorithmSHA1:
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h = sha1.New()
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case AlgorithmSHA256:
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h = sha256.New()
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case AlgorithmSHA512:
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h = sha512.New()
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case AlgorithmMD5:
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h = md5.New()
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default:
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return "", fmt.Errorf("unsupport digest method: %s", algorithm)
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}
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r := bufio.NewReader(f)
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_, err = io.Copy(h, r)
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if err != nil {
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return "", err
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}
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return hex.EncodeToString(h.Sum(nil)), nil
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}
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// Parse uses to parse digest string to algorithm and encoded.
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func Parse(digest string) (*Digest, error) {
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values := strings.Split(digest, ":")
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if len(values) == 2 {
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return &Digest{
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Algorithm: values[0],
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Encoded: values[1],
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}, nil
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}
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if len(values) == 1 {
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return &Digest{
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Algorithm: AlgorithmMD5,
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Encoded: values[0],
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}, nil
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}
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return nil, errors.New("invalid digest")
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}
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// Sha256 computes the SHA256 checksum with multiple data.
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func Sha256(data ...string) string {
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if len(data) == 0 {
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return ""
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}
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h := sha256.New()
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for _, s := range data {
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if _, err := h.Write([]byte(s)); err != nil {
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return ""
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}
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}
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return hex.EncodeToString(h.Sum(nil))
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}
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// Md5Reader computes the MD5 checksum with io.Reader.
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func Md5Reader(reader io.Reader) string {
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h := md5.New()
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r := bufio.NewReader(reader)
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if _, err := io.Copy(h, r); err != nil {
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return ""
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}
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return hex.EncodeToString(h.Sum(nil))
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}
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// Md5Bytes computes the MD5 checksum with []byte.
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func Md5Bytes(bytes []byte) string {
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h := md5.New()
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h.Write(bytes)
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return hex.EncodeToString(h.Sum(nil))
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}
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