使用私钥进行Python解密 [英] Python Decryption using private key

问题描述

我有一个加密的字符串。加密是使用Java代码完成的。我使用以下Java代码解密加密的字符串

I have an encrypted string. The Encryption is done using java code. I decrypt the encrypted string using following java code

InputStream fileInputStream = getClass().getResourceAsStream(
                    "/private.txt");
            byte[] bytes = IOUtils.toByteArray(fileInputStream);



private String decrypt(String inputString, byte[] keyBytes) {
        String resultStr = null;
        PrivateKey privateKey = null;
        try {
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(keyBytes);
            privateKey = keyFactory.generatePrivate(privateKeySpec);
        } catch (Exception e) {
            System.out.println("Exception privateKey:::::::::::::::::  "
                    + e.getMessage());
            e.printStackTrace();
        }
        byte[] decodedBytes = null;
        try {
            Cipher c = Cipher.getInstance("RSA/ECB/NoPadding");
            c.init(Cipher.DECRYPT_MODE, privateKey);
            decodedBytes = c.doFinal(Base64.decodeBase64(inputString));

        } catch (Exception e) {
            System.out
                    .println("Exception while using the cypher:::::::::::::::::  "
                            + e.getMessage());
            e.printStackTrace();
        }
        if (decodedBytes != null) {
            resultStr = new String(decodedBytes);
            resultStr = resultStr.split("MNSadm")[0];
            // System.out.println("resultStr:::" + resultStr + ":::::");
            // resultStr = resultStr.replace(salt, "");
        }
        return resultStr;

    }

现在我必须使用Python解密加密的字符串。我有私钥。当我使用以下代码使用密码封装

Now I have to use Python to decrypt the encrypted string. I have the private key. When I use Cryptography package using following code

key = load_pem_private_key(keydata, password=None, backend=default_backend())

它抛出 ValueError：无法反序列化关键数据。

有人可以帮助我在这里丢失的内容吗？

Can anyone help what I am missing here?

推荐答案

I找出解决方案：

from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from base64 import b64decode

rsa_key = RSA.importKey(open('private.txt', "rb").read())
cipher = PKCS1_v1_5.new(rsa_key)
raw_cipher_data = b64decode(<your cipher data>)
phn = cipher.decrypt(raw_cipher_data, <some default>)

这是最基本的代码形式。我了解到的是，首先您必须获得RSA_key（私钥）。对我来说， RSA.importKey 负责一切。真的很简单。

This is the most basic form of code. What I learned is first you have to get the RSA_key(private key). For me RSA.importKey took care of everything. Really simple.

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