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patientman/PatientMan/Utility.cs

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+using System.IO;
+using System.Text;
+using System;
+using System.Data;
+using System.Data.SqlClient;
+using System.Configuration;
+using System.Security.Cryptography;
+
+namespace PatientMan
+{
+    internal class Utility
+    {
+        public string GetDefaultPatientID()
+        {
+            return "AAA000000000000";
+        }
+
+
+
+        public static string Encrypt(string clearText)
+        {
+            string EncryptionKey = "PHT_27122008";
+            byte[] clearBytes = Encoding.Unicode.GetBytes(clearText);
+            using (Aes encryptor = Aes.Create())
+            {
+                Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
+                encryptor.Key = pdb.GetBytes(32);
+                encryptor.IV = pdb.GetBytes(16);
+                using (MemoryStream ms = new MemoryStream())
+                {
+                    using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
+                    {
+                        cs.Write(clearBytes, 0, clearBytes.Length);
+                        cs.Close();
+                    }
+                    clearText = Convert.ToBase64String(ms.ToArray());
+                }
+            }
+            return clearText;
+        }
+
+        public  static string Decrypt(string cipherText)
+        {
+            string EncryptionKey = "PHT_27122008";
+            byte[] cipherBytes = Convert.FromBase64String(cipherText);
+            using (Aes encryptor = Aes.Create())
+            {
+                Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
+                encryptor.Key = pdb.GetBytes(32);
+                encryptor.IV = pdb.GetBytes(16);
+                using (MemoryStream ms = new MemoryStream())
+                {
+                    using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
+                    {
+                        cs.Write(cipherBytes, 0, cipherBytes.Length);
+                        cs.Close();
+                    }
+                    cipherText = Encoding.Unicode.GetString(ms.ToArray());
+                }
+            }
+            return cipherText;
+        }
+
+    }
+}