C# 如果我有私钥我该如何解密？

Question

我像这样用Python加密

def encrypt_RSA(public_key_loc, message):
    '''
    param: public_key_loc Path to public key
    param: message String to be encrypted
    return base64 encoded encrypted string
    '''
    from Crypto.PublicKey import RSA
    from Crypto.Cipher import PKCS1_OAEP
    key = open(public_key_loc, "r").read()
    rsakey = RSA.importKey(key)
    rsakey = PKCS1_OAEP.new(rsakey)
    encrypted = rsakey.encrypt(message)
    return encrypted.encode('base64')

我尝试在 C# 中像这样解密，但它不起作用

namespace ConsoleApplication1
{

    class Program
    {
        private static string _message = @"gvVweOVn/+IBKNrFV1sb+khVu8PdBC78WusGH7IuCXxK4pEsFo8JbOb68phJAMVM1F8XPoq1PX4D
0VuVPmDFHadOUr59IX0IBbQ72bQ1/BoINimSVOzXRbHOfsNxd0kIEdCv6jNlA7ut7hcoGUz6XzdM
b+k8N2K9Dykjehoo9gZEhaXnws1YiuBVN4B+XyjB1VUrgji9fW60lcpL+0UYZ5mcUvK6T7hS7R9W
9QIf5T02iZJLsp3hxS9j/UxPCvK5Cj6t2h4fRCOYgiQv0L21ZD23nKYWgiGyGEmfArqIswUmZ0h2
I2zMs9vC2JVFIid6FpExHUScItBeuM8qYLA/YQ==";

        static void Main(string[] args)
        {

            Decrypt(_message);

        }

        private static void Decrypt(string text)
        {
            StreamReader sr = new StreamReader("./key.private");
        PemReader pr = new PemReader(sr);
        AsymmetricCipherKeyPair KeyPair = (AsymmetricCipherKeyPair)pr.ReadObject();
        RSAParameters rsa = DotNetUtilities.ToRSAParameters((RsaPrivateCrtKeyParameters)KeyPair.Private);            
        RSACryptoServiceProvider csp = new RSACryptoServiceProvider(2048);
        csp.ImportParameters(rsa);

        var bytesCypherText = Convert.FromBase64String(text);
        var bytesPlainTextData = csp.Decrypt(bytesCypherText, false);
        var plainTextData = System.Text.Encoding.Unicode.GetString(bytesPlainTextData);

        Console.WriteLine(plainTextData);

        }


    }
}

Bad Data exception appear

在 python 端我用这种方式解码。

def decrypt_RSA(private_key_loc, package):
    '''
    param: public_key_loc Path to your private key
    param: package String to be decrypted
    return decrypted string
    '''
    from Crypto.PublicKey import RSA
    from Crypto.Cipher import PKCS1_OAEP
    from base64 import b64decode
    key = open(private_key_loc, "r").read()
    rsakey = RSA.importKey(key)
    rsakey = PKCS1_OAEP.new(rsakey)
    decrypted = rsakey.decrypt(b64decode(package))
    return decrypted

在这种情况下如何影响私钥工作？

提前致谢!

Answer 1

在 python 端，您对加密字符串进行 base64 编码。在尝试使用 C# 解密之前，您需要对其进行 Base64 解码。您还需要确保两侧的密码参数( block 模式、填充等)相同。