无法解密 Java 服务器在 python 客户端中发送的 blob

Question

我有以下工作流程。

使用openssl生成rsa密钥对
Post public java 服务器的密钥
服务器在内存中构造public键
服务器使用 public 密钥加密文本并发回 blob
Python 用私钥解密 blob

生成 public/private 密钥对：

openssl genrsa -out privkey.pem 1024 # generate private key

openssl rsa -in privkey.pem -pubout > pubkey.pem # derive public key

openssl pkcs8 -topk8 -in privkey.pem -outform PEM -inform PEM -nocrypt -out   privkey.pkcs8 # convert private key to PKCS8 format

Python代码

import requests
import base64
from Crypto.PublicKey import RSA

privkey_content = open('./keys/privkey.pkcs8', 'rb')
pubkey_content = open('./keys/pubkey.pem', 'rb')
priv_key = RSA.importKey(privkey_content.read())
pub_key = RSA.importKey(pubkey_content.read())
pubkey_der_content = pub_key.exportKey(format='DER')
data = {'key' : base64.b64encode(pubkey_der_content)}
resp = requests.post('http://localhost:9000/crypt/', data=data)
decoded = priv_key.decrypt(base64.b64decode(resp.text))
with open('/tmp/decoded.txt', 'wb') as f:
    f.write(decoded)

Java 服务器代码：

package com.hs.works;

import org.apache.commons.codec.binary.Base64;
import org.eclipse.jetty.http.HttpStatus;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.X509EncodedKeySpec;
import java.security.KeyFactory;

import javax.crypto.Cipher;

public class CryptServlet extends HttpServlet {

    byte[] encrypt(byte[] pubKey, String text) {
        try {
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(pubKey);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            RSAPublicKey k = (RSAPublicKey) keyFactory.generatePublic(keySpec);
            final Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.ENCRYPT_MODE, k);
            return cipher.doFinal(text.getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String key = req.getParameter("key");
        byte[] decoded_bytes = Base64.decodeBase64(key.getBytes());
        byte[] encoded = encrypt(decoded_bytes, "SECRET_TEXT");
        resp.setStatus(HttpStatus.OK_200);
        resp.getWriter().write(new String(Base64.encodeBase64(encoded)));
    }
}

输出：

>>>f = open('/tmp/decoded.txt', 'rb')
>>>c = f.read()
>>> c
'\x02bt\x1bq\xb1\x9bc\xef\xe30Q,o)<\xe8!z3B\xb7\xcf\xecWfN\x0f\x92~q\xb2\xcb\xa7\x15?%\xd1\xbf0$A,\x1ap?bZ$\xca6\xeet \xfc\x8d\x11\xee\n\x1b \xd3\xba\xaf\t\xf4&\x01\xa3\xb9H~\xd5o\x0c\xb3c\xa8\xdd\x9f4*\x86\x92\xe0\xcb\xb4\x1d\xcb\x9889\x856\xf9\xff\x9cGf\xf9\xa4\xc7\xadR\xb5\xcaU\xfc\xd355\xae\x87\x80\x1e\x00SECRET_TEXT'
>>>
>>> c[len(c) - 11:]
'SECRET_TEXT'

在 python 端打印输出时，我在输出中看到 SECRET_TEXT，但也有很多乱码。

我不确定它是否与填充或其他问题有关。

Answer 1

我没有指定正确的密码。

在服务器代码中进行了以下更改：

final Cipher cipher = Cipher.getInstance("RSA/ECB/OAEPWithSHA-1AndMGF1Padding");

并在 python 客户端代码中进行以下更改：

from Crypto.Cipher import PKCS1_OAEP
rsa_key = RSA.generate(2048)
cipher = PKCS1_OAEP.new(rsa_key)
pubkey = rsa_key.publickey()
data = {'key' : base64.b64encode(pubkey.exportKey(format='DER'))}
resp = requests.post('http://localhost:9000/crypt/', data=data)
decoded = cipher.decrypt(base64.b64decode(resp.text))

无法解密 Java 服务器在 python 客户端中发送的 blob

Cannot decrypt blob send by Java server in python client

python

java

cryptography

public-key-encryption

pycrypto