114 lines
2.7 KiB
Go
114 lines
2.7 KiB
Go
package crypto
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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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"crypto/rand"
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"encoding/base64"
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"encoding/hex"
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"errors"
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"io"
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)
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// PKCS7填充
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func PKCS7Padding(ciphertext []byte, blockSize int) []byte {
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padding := blockSize - len(ciphertext)%blockSize
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padtext := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(ciphertext, padtext...)
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}
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// 去除PKCS7填充
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func PKCS7UnPadding(origData []byte) ([]byte, error) {
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length := len(origData)
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if length == 0 {
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return nil, errors.New("input data error")
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}
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unpadding := int(origData[length-1])
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if unpadding > length {
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return nil, errors.New("unpadding size is invalid")
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}
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// 检查填充字节是否一致
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for i := 0; i < unpadding; i++ {
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if origData[length-1-i] != byte(unpadding) {
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return nil, errors.New("invalid padding")
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}
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}
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return origData[:(length - unpadding)], nil
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}
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// AES CBC模式加密，Base64传入传出
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func AesEncrypt(plainText []byte, key string) (string, error) {
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keyBytes, err := hex.DecodeString(key)
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if err != nil {
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return "", err
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}
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block, err := aes.NewCipher(keyBytes)
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if err != nil {
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return "", err
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}
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blockSize := block.BlockSize()
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plainText = PKCS7Padding(plainText, blockSize)
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cipherText := make([]byte, blockSize+len(plainText))
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iv := cipherText[:blockSize] // 使用前blockSize字节作为IV
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_, err = io.ReadFull(rand.Reader, iv)
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if err != nil {
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return "", err
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}
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mode := cipher.NewCBCEncrypter(block, iv)
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mode.CryptBlocks(cipherText[blockSize:], plainText)
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return base64.StdEncoding.EncodeToString(cipherText), nil
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}
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// AES CBC模式解密，Base64传入传出
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func AesDecrypt(cipherTextBase64 string, key string) ([]byte, error) {
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keyBytes, err := hex.DecodeString(key)
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if err != nil {
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return nil, err
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}
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cipherText, err := base64.StdEncoding.DecodeString(cipherTextBase64)
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if err != nil {
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return nil, err
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}
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block, err := aes.NewCipher(keyBytes)
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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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if len(cipherText) < blockSize {
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return nil, errors.New("ciphertext too short")
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}
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iv := cipherText[:blockSize]
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cipherText = cipherText[blockSize:]
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if len(cipherText)%blockSize != 0 {
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return nil, errors.New("ciphertext is not a multiple of the block size")
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}
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mode := cipher.NewCBCDecrypter(block, iv)
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mode.CryptBlocks(cipherText, cipherText)
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plainText, err := PKCS7UnPadding(cipherText)
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if err != nil {
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return nil, err
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}
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return plainText, nil
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}
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// Md5Encrypt 用于对传入的message进行MD5加密
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func Md5Encrypt(message string) string {
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hash := md5.New()
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hash.Write([]byte(message)) // 将字符串转换为字节切片并写入
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return hex.EncodeToString(hash.Sum(nil)) // 将哈希值转换为16进制字符串并返回
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}
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