private bool ValidateAppResponse(string jsonData, Encoding encoding)
{
//获取签名
Dictionary <string, object> data = SDKUtil.JsonToDictionary(jsonData);
string dataString = (string)data["data"];
string signString = (string)data["sign"];
byte[] signByte = Convert.FromBase64String(signString);
byte[] dataByte = encoding.GetBytes(dataString);
IDigest digest = DigestUtilities.GetDigest("SHA1");
digest.BlockUpdate(dataByte, 0, dataByte.Length);
byte[] dataDigest = DigestUtilities.DoFinal(digest);
string digestString = BitConverter.ToString(dataDigest).Replace("-", "").ToLower();
if (appVerifyPubKey == null)
{
using (FileStream fileStream = new FileStream("d:/certs/acp_test_app_verify_sign.cer", FileMode.Open))//TODO: 这个是测试环境的证书，切换生产需要改生产证书。
{
X509Certificate certificate = new X509CertificateParser().ReadCertificate(fileStream);
this.appVerifyPubKey = certificate.GetPublicKey();
}
}
byte[] digestByte = encoding.GetBytes(digestString);
ISigner verifier = SignerUtilities.GetSigner("SHA1WithRSA");
verifier.Init(false, this.appVerifyPubKey);
verifier.BlockUpdate(digestByte, 0, digestByte.Length);
return(verifier.VerifySignature(signByte));
}