EncryptedACHProvider.cs

using System;
using PX.Data;
using PX.Objects.IN;
using PX.DataSync;
using PX.Common.Cryptography;
using System.Security.Cryptography;
using System.Web.Configuration;
using System.Text;

namespace MyProject
{
	public class EncryptedACHProvider : ACHProvider
	{
		public override string ProviderName
		{
			get
			{
				return "Encrypted ACH";
			}
		}

		protected override PX.SM.FileInfo SetFile(byte[] bytes)
		{
			SymmetricCryptoProvider provider = CreateSymetricProvider();
			bytes = provider.Encrypt(bytes);

			return base.SetFile(bytes);
		}

		private static SymmetricCryptoProvider CreateSymetricProvider()
		{
			MachineKeySection keySection = (MachineKeySection)WebConfigurationManager.GetSection("system.web/machineKey");

			TripleDESCryptoServiceProvider provider = new TripleDESCryptoServiceProvider();

			byte[] IV = new byte[provider.IV.Length];
			Array.Copy(CryptoProvider.HexStringToByteArray(keySection.DecryptionKey), IV, IV.Length);

			byte[] key = new byte[provider.Key.Length];
			Array.Copy(CryptoProvider.HexStringToByteArray(keySection.ValidationKey), key, key.Length);

			return new SymmetricCryptoProvider(
				provider.CreateEncryptor(key, IV),
				provider.CreateDecryptor(key, IV));
		}	
	}
}