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// Copyright © 2023 OpenIM. 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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//
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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 utils
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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"crypto/md5"
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"encoding/hex"
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"errors"
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)
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func Md5(s string, salt ...string) string {
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h := md5.New()
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h.Write([]byte(s))
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if len(salt) > 0 {
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h.Write([]byte(salt[0]))
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}
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cipher := h.Sum(nil)
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return hex.EncodeToString(cipher)
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}
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func AesEncrypt(data []byte, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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blockSize := block.BlockSize()
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encryptBytes := pkcs7Padding(data, blockSize)
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crypted := make([]byte, len(encryptBytes))
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blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
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blockMode.CryptBlocks(crypted, encryptBytes)
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return crypted, nil
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}
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func AesDecrypt(data []byte, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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blockSize := block.BlockSize()
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blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
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crypted := make([]byte, len(data))
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blockMode.CryptBlocks(crypted, data)
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crypted, err = pkcs7UnPadding(crypted)
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if err != nil {
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return nil, err
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}
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return crypted, nil
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}
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func pkcs7Padding(data []byte, blockSize int) []byte {
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padding := blockSize - len(data)%blockSize
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padText := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(data, padText...)
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}
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func pkcs7UnPadding(data []byte) ([]byte, error) {
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length := len(data)
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if length == 0 {
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return nil, errors.New("encrypt error")
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}
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unPadding := int(data[length-1])
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return data[:(length - unPadding)], nil
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}
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