using System.Security.Cryptography;
using com.hitrust.b2b.trustpay.client;
using System;
using System.Text;
using System.Security.Cryptography.X509Certificates;

namespace com.hitrust.b2b.Security
{
	public class Signature
	{
		public int verifySignature(string aCertFile, string aMessage, string aBase64Signature)
		{
			X509Certificate certificate;
			int num = 0;
			try {
				certificate = X509Certificate.CreateFromCertFile(aCertFile);
				byte[] rgbSignature = new Base64().decode(aBase64Signature);
				byte[] rgbHash = new SHA1Managed().ComputeHash(Encoding.GetEncoding("UTF-8").GetBytes(aMessage));

				//certificate.PublicKey.ExportParameters(false);
				RSACryptoServiceProvider publicKey = new RSACryptoServiceProvider();
				publicKey.ImportParameters(new RSAParameters() { Exponent = certificate.GetPublicKey() });
				if (!publicKey.VerifyHash(rgbHash, CryptoConfig.MapNameToOID("SHA1"), rgbSignature)) {
					num = -1;
				}
			} catch (Exception exception) {
				SupportClass.WriteStackTrace(exception, Console.Out);
				num = 1;
			}
			return num;
		}
	}
}