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crypto.go
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crypto.go
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package pcsutil
import (
"fmt"
"github.com/iikira/Baidu-Login/bdcrypto"
"io"
"os"
"strings"
)
// CryptoMethodSupport 检测是否支持加密解密方法
func CryptoMethodSupport(method string) bool {
switch method {
case "aes-128-ctr", "aes-192-ctr", "aes-256-ctr", "aes-128-cfb", "aes-192-cfb", "aes-256-cfb", "aes-128-ofb", "aes-192-ofb", "aes-256-ofb":
return true
}
return false
}
// EncryptFile 加密本地文件
func EncryptFile(method string, key []byte, filePath string, isGzip bool) (encryptedFilePath string, err error) {
if !CryptoMethodSupport(method) {
return "", fmt.Errorf("unknown encrypt method: %s", method)
}
if isGzip {
err = bdcrypto.GZIPCompressFile(filePath)
if err != nil {
return
}
}
plainFile, err := os.OpenFile(filePath, os.O_RDONLY, 0)
if err != nil {
return
}
defer plainFile.Close()
var cipherReader io.Reader
switch method {
case "aes-128-ctr":
cipherReader, err = bdcrypto.Aes128CTREncrypt(bdcrypto.Convert16bytes(key), plainFile)
case "aes-192-ctr":
cipherReader, err = bdcrypto.Aes192CTREncrypt(bdcrypto.Convert24bytes(key), plainFile)
case "aes-256-ctr":
cipherReader, err = bdcrypto.Aes256CTREncrypt(bdcrypto.Convert32bytes(key), plainFile)
case "aes-128-cfb":
cipherReader, err = bdcrypto.Aes128CFBEncrypt(bdcrypto.Convert16bytes(key), plainFile)
case "aes-192-cfb":
cipherReader, err = bdcrypto.Aes192CFBEncrypt(bdcrypto.Convert24bytes(key), plainFile)
case "aes-256-cfb":
cipherReader, err = bdcrypto.Aes256CFBEncrypt(bdcrypto.Convert32bytes(key), plainFile)
case "aes-128-ofb":
cipherReader, err = bdcrypto.Aes128OFBEncrypt(bdcrypto.Convert16bytes(key), plainFile)
case "aes-192-ofb":
cipherReader, err = bdcrypto.Aes192OFBEncrypt(bdcrypto.Convert24bytes(key), plainFile)
case "aes-256-ofb":
cipherReader, err = bdcrypto.Aes256OFBEncrypt(bdcrypto.Convert32bytes(key), plainFile)
default:
return "", fmt.Errorf("unknown encrypt method: %s", method)
}
if err != nil {
return
}
plainFileInfo, err := plainFile.Stat()
if err != nil {
return
}
encryptedFilePath = filePath + ".encrypt"
encryptedFile, err := os.OpenFile(encryptedFilePath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, plainFileInfo.Mode())
if err != nil {
return
}
defer encryptedFile.Close()
_, err = io.Copy(encryptedFile, cipherReader)
if err != nil {
return
}
os.Remove(filePath)
return encryptedFilePath, nil
}
// DecryptFile 加密本地文件
func DecryptFile(method string, key []byte, filePath string, isGzip bool) (decryptedFilePath string, err error) {
if !CryptoMethodSupport(method) {
return "", fmt.Errorf("unknown decrypt method: %s", method)
}
cipherFile, err := os.OpenFile(filePath, os.O_RDONLY, 0644)
if err != nil {
return
}
defer cipherFile.Close()
var plainReader io.Reader
switch method {
case "aes-128-ctr":
plainReader, err = bdcrypto.Aes128CTRDecrypt(bdcrypto.Convert16bytes(key), cipherFile)
case "aes-192-ctr":
plainReader, err = bdcrypto.Aes192CTRDecrypt(bdcrypto.Convert24bytes(key), cipherFile)
case "aes-256-ctr":
plainReader, err = bdcrypto.Aes256CTRDecrypt(bdcrypto.Convert32bytes(key), cipherFile)
case "aes-128-cfb":
plainReader, err = bdcrypto.Aes128CFBDecrypt(bdcrypto.Convert16bytes(key), cipherFile)
case "aes-192-cfb":
plainReader, err = bdcrypto.Aes192CFBDecrypt(bdcrypto.Convert24bytes(key), cipherFile)
case "aes-256-cfb":
plainReader, err = bdcrypto.Aes256CFBDecrypt(bdcrypto.Convert32bytes(key), cipherFile)
case "aes-128-ofb":
plainReader, err = bdcrypto.Aes128OFBDecrypt(bdcrypto.Convert16bytes(key), cipherFile)
case "aes-192-ofb":
plainReader, err = bdcrypto.Aes192OFBDecrypt(bdcrypto.Convert24bytes(key), cipherFile)
case "aes-256-ofb":
plainReader, err = bdcrypto.Aes256OFBDecrypt(bdcrypto.Convert32bytes(key), cipherFile)
default:
return "", fmt.Errorf("unknown decrypt method: %s", method)
}
if err != nil {
return
}
cipherFileInfo, err := cipherFile.Stat()
if err != nil {
return
}
decryptedFilePath = strings.TrimSuffix(filePath, ".encrypt")
decryptedTmpFilePath := decryptedFilePath + ".decrypted"
decryptedTmpFile, err := os.OpenFile(decryptedTmpFilePath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, cipherFileInfo.Mode())
_, err = io.Copy(decryptedTmpFile, plainReader)
if err != nil {
return
}
defer decryptedTmpFile.Close()
if isGzip {
err = bdcrypto.GZIPUnompressFile(decryptedTmpFilePath)
if err != nil {
os.Remove(decryptedTmpFilePath)
return
}
// 删除已加密的文件
os.Remove(filePath)
}
if strings.Compare(filePath, decryptedFilePath) != 0 {
os.Rename(decryptedTmpFilePath, decryptedFilePath)
} else {
decryptedFilePath = decryptedTmpFilePath
}
return decryptedFilePath, nil
}