C# RSA 非对称加密算法

示例如下：

using Newtonsoft.Json;

void Main()
{
    var keySize = 2048;

    var rsaCryptoServiceProvider = new RSACryptoServiceProvider(keySize);

    // 打印私钥、公钥
    Convert.ToBase64String(rsaCryptoServiceProvider.ExportPkcs8PrivateKey()).Dump();
    Convert.ToBase64String(rsaCryptoServiceProvider.ExportRSAPublicKey()).Dump();

    var parameters = rsaCryptoServiceProvider.ExportParameters(true);
    // 加密后的字符串
    var cipherText = Encrypt("hello world", parameters);

    // 解密后的字符串
    var plainText = Decrypt(cipherText, parameters);
    Console.WriteLine(plainText);

}

// 加密
public string Encrypt(string data, RSAParameters key)
{

    using (var rsa = new RSACryptoServiceProvider())
    {
        rsa.ImportParameters(key);
        var byteData = Encoding.UTF8.GetBytes(data);
        var encryptData = rsa.Encrypt(byteData, false);
        return Convert.ToBase64String(encryptData);
    }
}

// 解密
public string Decrypt(string cipherText, RSAParameters key)
{

    using (var rsa = new RSACryptoServiceProvider())
    {
        var cipherByteData = Convert.FromBase64String(cipherText);
        rsa.ImportParameters(key);

        var encryptData = rsa.Decrypt(cipherByteData, false);
        return Encoding.UTF8.GetString(encryptData);
    }
}