golang实现加密解密文档

package mainimport ("bytes""crypto/aes""crypto/cipher""crypto/rand""encoding/base64""flag""fmt""io""io/ioutil"
)func main() {encodePtr := flag.String("e", "", "File to be encoded")decodePtr := flag.String("d", "", "File to be decoded")outputPtr := flag.String("o", "", "Output file")keyPtr := flag.String("k", "", "Decryption key")flag.Parse()if *encodePtr != "" {key := encryptFile(*encodePtr, *outputPtr)fmt.Println("Encryption key:", key)} else if *decodePtr != "" && *keyPtr != "" {decryptFile(*decodePtr, *keyPtr, *outputPtr)} else {flag.PrintDefaults()}
}func encryptFile(inputFile, outputFile string) string {plaintext, err := ioutil.ReadFile(inputFile)if err != nil {fmt.Println("Error reading input file:", err)return ""}key := make([]byte, 16)_, err = rand.Read(key)if err != nil {fmt.Println("Error generating random key:", err)return ""}block, err := aes.NewCipher(key)if err != nil {fmt.Println("Error creating AES cipher:", err)return ""}// Padding the plaintext to a multiple of the block sizepadding := aes.BlockSize - (len(plaintext) % aes.BlockSize)if padding > 0 {plaintext = append(plaintext, bytes.Repeat([]byte{byte(padding)}, padding)...)}ciphertext := make([]byte, aes.BlockSize+len(plaintext))iv := ciphertext[:aes.BlockSize]if _, err := io.ReadFull(rand.Reader, iv); err != nil {fmt.Println("Error generating IV:", err)return ""}mode := cipher.NewCBCEncrypter(block, iv)mode.CryptBlocks(ciphertext[aes.BlockSize:], plaintext)encoded := base64.StdEncoding.EncodeToString(ciphertext)if outputFile != "" {err := ioutil.WriteFile(outputFile, []byte(encoded), 0644)if err != nil {fmt.Println("Error writing to output file:", err)return ""}}return base64.StdEncoding.EncodeToString(key)
}func decryptFile(inputFile, keyString, outputFile string) {ciphertext, err := ioutil.ReadFile(inputFile)if err != nil {fmt.Println("Error reading input file:", err)return}key, err := base64.StdEncoding.DecodeString(keyString)if err != nil {fmt.Println("Error decoding key:", err)return}block, err := aes.NewCipher(key)if err != nil {fmt.Println("Error creating AES cipher:", err)return}decoded, err := base64.StdEncoding.DecodeString(string(ciphertext))if err != nil {fmt.Println("Error decoding Base64:", err)return}if len(decoded) < aes.BlockSize {fmt.Println("Ciphertext too short")return}iv := decoded[:aes.BlockSize]decoded = decoded[aes.BlockSize:]if len(decoded)%aes.BlockSize != 0 {fmt.Println("Ciphertext is not a multiple of the block size")return}mode := cipher.NewCBCDecrypter(block, iv)mode.CryptBlocks(decoded, decoded)// Remove paddingpadding := decoded[len(decoded)-1]decoded = decoded[:len(decoded)-int(padding)]err = ioutil.WriteFile(outputFile, decoded, 0644)if err != nil {fmt.Println("Error writing to output file:", err)return}fmt.Println("Decryption successful. Decrypted content written to", outputFile)
}

实现效果：

打包代码

go build -ldflags=" -s -w" -buildvcs=false follow-me.go