/// <summary>
/// 生成RSA密钥对，公钥就是私钥的Modulus
/// </summary>
/// <param name="dwKeySize">密钥长度，默认2048</param>
/// <returns>RSA密钥对(公钥, 私钥)</returns>
public static (string publicKey, string privateKey) GenRSAKeyPair(int dwKeySize = 2048)
{
RSA rsa = RSA.Create();
rsa.KeySize = dwKeySize;
RSAParameters rsaParams = rsa.ExportParameters(true);
// 公钥
var publicKey = Convert.ToBase64String(rsaParams.Modulus);
// 私钥
var privateKey = rsaParams.ToJson();
return(publicKey, privateKey);
}