go中使用des cbc加密解密

加密:

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func MyEncrypt(data, key []byte, iv []byte) ([]byte, error) {     /*         key必须是8位,否则报错:         if len(key) != 8 {             return nil, KeySizeError(len(key))         }     */     block, err := des.NewCipher(key)     if err != nil {         return nil, err     }     bs := block.BlockSize()     data = PKCS5Padding(data, bs) //填充字符     blockMode := cipher.NewCBCEncrypter(block, iv)     out := make([]byte, len(data))     blockMode.CryptBlocks(out, data)     return out, nil }   func PKCS5Padding(ciphertext []byte, blockSize int) []byte {     padding := blockSize - len(ciphertext)%blockSize     padText := bytes.Repeat([]byte{byte(padding)}, padding)     return append(ciphertext, padText...) }   func base64Encode(src []byte) []byte {     return []byte(base64.StdEncoding.EncodeToString(src)) }   func main() {     key := []byte("12345678")     iv := []byte("12345678")     data := []byte("hello world")     out, _ := MyEncrypt(data, key, iv)     deByte := base64Encode(out)     log.Println("加密后:", string(deByte))   //2022/01/17 15:40:30 加密后: CyqS6B+0nOGkMmaqyup7gQ== }

解密:　

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func MyDecrypt(data []byte, key []byte, iv []byte) ([]byte, error) {     block, err := des.NewCipher(key)     if err != nil {         return nil, err     }     blockMode := cipher.NewCBCDecrypter(block, iv)     out := make([]byte, len(data))     blockMode.CryptBlocks(out, data)     out = PKCS5UnPadding(out)     return out, nil }   func PKCS5UnPadding(origData []byte) []byte {     length := len(origData)     unPadding := int(origData[length-1])     return origData[:(length - unPadding)] }   func base64Decode(src []byte) ([]byte, error) {     return base64.StdEncoding.DecodeString(string(src)) }   func main() {     key := []byte("12345678")     iv := []byte("12345678")     src := []byte("CyqS6B+0nOGkMmaqyup7gQ==")     enByte, _ := base64Decode(src)     out, _ := MyDecrypt(enByte, key, iv)     log.Println("解密后:", string(out))  //2022/01/17 15:44:23 解密后: hello world }