mirror of
https://github.com/gohugoio/hugo.git
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138 lines
3.1 KiB
Go
138 lines
3.1 KiB
Go
// Copyright 2017 The Hugo Authors. All rights reserved.
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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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// 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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// Package crypto provides template functions for cryptographic operations.
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package crypto
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import (
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"crypto/hmac"
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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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"fmt"
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"hash"
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"hash/fnv"
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"github.com/spf13/cast"
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)
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// New returns a new instance of the crypto-namespaced template functions.
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func New() *Namespace {
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return &Namespace{}
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}
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// Namespace provides template functions for the "crypto" namespace.
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type Namespace struct{}
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// MD5 hashes the v and returns its MD5 checksum.
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func (ns *Namespace) MD5(v any) (string, error) {
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conv, err := cast.ToStringE(v)
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if err != nil {
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return "", err
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}
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hash := md5.Sum([]byte(conv))
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return hex.EncodeToString(hash[:]), nil
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}
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// SHA1 hashes v and returns its SHA1 checksum.
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func (ns *Namespace) SHA1(v any) (string, error) {
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conv, err := cast.ToStringE(v)
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if err != nil {
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return "", err
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}
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hash := sha1.Sum([]byte(conv))
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return hex.EncodeToString(hash[:]), nil
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}
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// SHA256 hashes v and returns its SHA256 checksum.
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func (ns *Namespace) SHA256(v any) (string, error) {
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conv, err := cast.ToStringE(v)
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if err != nil {
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return "", err
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}
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hash := sha256.Sum256([]byte(conv))
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return hex.EncodeToString(hash[:]), nil
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}
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// FNV32a hashes v using fnv32a algorithm.
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// <docsmeta>{"newIn": "0.98.0" }</docsmeta>
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func (ns *Namespace) FNV32a(v any) (int, error) {
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conv, err := cast.ToStringE(v)
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if err != nil {
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return 0, err
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}
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algorithm := fnv.New32a()
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algorithm.Write([]byte(conv))
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return int(algorithm.Sum32()), nil
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}
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// HMAC returns a cryptographic hash that uses a key to sign a message.
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func (ns *Namespace) HMAC(h any, k any, m any, e ...any) (string, error) {
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ha, err := cast.ToStringE(h)
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if err != nil {
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return "", err
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}
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var hash func() hash.Hash
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switch ha {
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case "md5":
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hash = md5.New
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case "sha1":
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hash = sha1.New
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case "sha256":
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hash = sha256.New
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case "sha512":
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hash = sha512.New
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default:
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return "", fmt.Errorf("hmac: %s is not a supported hash function", ha)
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}
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msg, err := cast.ToStringE(m)
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if err != nil {
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return "", err
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}
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key, err := cast.ToStringE(k)
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if err != nil {
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return "", err
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}
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mac := hmac.New(hash, []byte(key))
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_, err = mac.Write([]byte(msg))
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if err != nil {
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return "", err
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}
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encoding := "hex"
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if len(e) > 0 && e[0] != nil {
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encoding, err = cast.ToStringE(e[0])
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if err != nil {
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return "", err
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}
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}
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switch encoding {
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case "binary":
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return string(mac.Sum(nil)[:]), nil
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case "hex":
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return hex.EncodeToString(mac.Sum(nil)[:]), nil
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default:
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return "", fmt.Errorf("%q is not a supported encoding method", encoding)
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}
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}
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