verify integrity certificat { RSACryptoServiceProvider - SHA1 - Thumbprint}

[custo76]

Hello, sorry for my english.

I have a little problem. I want to verify the integrity of my certificat.

I make this code:

using System.Security.Cryptography;
using System.Runtime.InteropServices;
using System.Security.Cryptography.X509Certificates; 

SHA1Managed sha1 = new SHA1Managed();
RSACryptoServiceProvider csp = null;
AsymmetricAlgorithm rsaAlgo = certificatEnCours.PublicKey.Key;
byte[] data = null;
byte[] hash = null;

string keyPublic = "";
string signatureNumérique = "";

bool verif = false;

// ------------- PART 1 -------------

signatureNumérique = certificatEnCours.Thumbprint;

data = Convert.FromBase64String(signatureNumérique);

// ------------- PART 2 -------------

hash = sha1.ComputeHash(certificatEnCours.RawData);

keyPublic = rsaAlgo.ToXmlString(false);

csp = new RSACryptoServiceProvider();

csp.FromXmlString(keyPublic);

// ------------------------------

verif = csp.VerifyData(hash, CryptoConfig.MapNameToOID("SHA1"), data);

but i have already value "false" for the var "verif"