如何在c#中用x509证书和sha256算法对soup请求签名

X509Certificate2 certificate = new X509Certificate2("path_to_certificate.pfx", "certificate_password");

using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Text;

// 将SOAP请求转换为字节数组
byte[] soapBytes = Encoding.UTF8.GetBytes(soapRequest);

// 创建SHA256签名对象
using (SHA256 sha256 = SHA256.Create())
{
    // 计算SOAP请求的哈希值
    byte[] hash = sha256.ComputeHash(soapBytes);

    // 使用证书的私钥对哈希值进行签名
    RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)certificate.PrivateKey;
    byte[] signature = rsa.SignHash(hash, CryptoConfig.MapNameToOID("SHA256"));
    
    // 将签名结果转换为Base64字符串
    string signatureBase64 = Convert.ToBase64String(signature);
    
    // 将签名结果添加到SOAP请求中
    string signedSoapRequest = soapRequest.Replace("</soap:Body>", $"<Signature>{signatureBase64}</Signature></soap:Body>");
}