我在我的python(Django)服务器上获取此代码,以加密我的消息到Java客户端(Android)。
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import base64
import hashlib
from Crypto import Random
from Crypto.Cipher import AES
class AESCipher:
def __init__(self, key):
self.bs = 16
self.key = hashlib.sha256(key.encode()).digest()
def encrypt(self, raw):
raw = self._pad(raw)
iv = Random.new().read(AES.block_size)
cipher = AES.new(self.key, AES.MODE_CBC, iv)
cTxt = (iv + cipher.encrypt(raw))
return base64.b64encode(cTxt)
def decrypt(self, enc):
enc = base64.b64decode(enc)
iv = enc[:AES.block_size]
cipher = AES.new(self.key, AES.MODE_CBC, iv)
dPadded = cipher.decrypt(enc[AES.block_size:])
return self._unpad(dPadded).decode('utf-8')
def _pad(self, s):
return s + (self.bs - len(s) % self.bs) * chr(self.bs - len(s) % self.bs)
@staticmethod
def _unpad(s):
return s[:-ord(s[len(s)-1:])]
我用这种方式:
phrase = "Prueba de Encryptado"
key = "e8ffc7e56311679f12b6fc91aa77a5eb"
cryp = AESCipher(key)
eTxt = cryp.encrypt(phrase)
dTxt = cryp.decrypt(eTxt)
在我的Java-Android客户端上;我尝试用这个类解密:
public class Crypt {
private static final String tag = Crypt.class.getSimpleName();
private static final String characterEncoding = "UTF-8";
private static final String cipherTransformation = "AES/CBC/PKCS5Padding";
private static final String aesEncryptionAlgorithm = "AES";
private static final String key = "e8ffc7e56311679f12b6fc91aa77a5eb";
private static byte[] ivBytes = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
private static byte[] keyBytes;
private static Crypt instance = null;
private Crypt(){}
public static Crypt getInstance() {
if(instance == null){
instance = new Crypt();
}
return instance;
}
public byte[] encrypt( byte[] mes)
throws NoSuchAlgorithmException,
NoSuchPaddingException,
InvalidKeyException,
InvalidAlgorithmParameterException,
IllegalBlockSizeException,
BadPaddingException, IOException {
keyBytes = key.getBytes("UTF-8");
Log.d(tag,"Long KEY: "+keyBytes.length);
MessageDigest md = MessageDigest.getInstance("SHA-256");
md.update(keyBytes);
keyBytes = md.digest();
Log.d(tag,"Long KEY: "+keyBytes.length);
AlgorithmParameterSpec ivSpec = new IvParameterSpec(ivBytes);
SecretKeySpec newKey = new SecretKeySpec(keyBytes, "AES");
Cipher cipher = null;
cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, newKey, ivSpec);
byte[] destination = new byte[ivBytes.length + mes.length];
System.arraycopy(ivBytes, 0, destination, 0, ivBytes.length);
System.arraycopy(mes, 0, destination, ivBytes.length, mes.length);
return cipher.doFinal(destination);
}
public byte[] decrypt( byte[] bytes)
throws NoSuchAlgorithmException,
NoSuchPaddingException,
InvalidKeyException,
InvalidAlgorithmParameterException,
IllegalBlockSizeException,
BadPaddingException, IOException, ClassNotFoundException {
keyBytes = key.getBytes("UTF-8");
Log.d(tag,"Long KEY: "+keyBytes.length);
MessageDigest md = MessageDigest.getInstance("SHA-256");
md.update(keyBytes);
keyBytes = md.digest();
Log.d(tag,"Long KEY: "+keyBytes.length);
byte[] ivB = Arrays.copyOfRange(bytes,0,16);
Log.d(tag, "IV: "+new String(ivB));
byte[] codB = Arrays.copyOfRange(bytes,16,bytes.length);
AlgorithmParameterSpec ivSpec = new IvParameterSpec(ivB);
SecretKeySpec newKey = new SecretKeySpec(keyBytes, "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, newKey, ivSpec);
return cipher.doFinal(codB);
}
}
但是我不能像我在python代码中那样解密;我不知道为什么,但我尝试的每一次;这些是我的例外:
javax.crypto.BadPaddingException: error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt
at com.android.org.conscrypt.NativeCrypto.EVP_CipherFinal_ex(Native Method)
at com.android.org.conscrypt.OpenSSLCipher.doFinalInternal(OpenSSLCipher.java:430)
at com.android.org.conscrypt.OpenSSLCipher.engineDoFinal(OpenSSLCipher.java:466)
at javax.crypto.Cipher.doFinal(Cipher.java:1340)
at net.kaimanden.testcrypt.Crypt.doDecryption(Crypt.java:75)
答案 0 :(得分:0)
您忘记在Java代码中派生密钥。在python代码中,您使用密码(key
)通过SHA-256派生实际的256位密钥。
另一方面,在Java中,你直接使用key = "HolaQueTal"
,它甚至太短而不能用作正确的密钥,甚至不是你的python示例中的密钥。 MessageDigest类支持SHA-256。