Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Security / CookieProtection.cs / 1 / CookieProtection.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Security { using System.Security.Cryptography; using System.Web.Configuration; using System.Web.Management; public enum CookieProtection { None, Validation, Encryption, All } internal class CookieProtectionHelper { internal static string Encode (CookieProtection cookieProtection, byte [] buf, int count) { if (cookieProtection == CookieProtection.All || cookieProtection == CookieProtection.Validation) { byte[] bMac = MachineKeySection.HashData (buf, null, 0, count); if (bMac == null || bMac.Length != 20) return null; if (buf.Length >= count + 20) { Buffer.BlockCopy (bMac, 0, buf, count, 20); } else { byte[] bTemp = buf; buf = new byte[count + 20]; Buffer.BlockCopy (bTemp, 0, buf, 0, count); Buffer.BlockCopy (bMac, 0, buf, count, 20); } count += 20; } if (cookieProtection == CookieProtection.All || cookieProtection == CookieProtection.Encryption) { buf = MachineKeySection.EncryptOrDecryptData (true, buf, null, 0, count); count = buf.Length; } if (count < buf.Length) { byte[] bTemp = buf; buf = new byte[count]; Buffer.BlockCopy (bTemp, 0, buf, 0, count); } return HttpServerUtility.UrlTokenEncode(buf); } internal static byte[] Decode (CookieProtection cookieProtection, string data) { byte [] buf = HttpServerUtility.UrlTokenDecode(data); if (buf == null || cookieProtection == CookieProtection.None) return buf; if (cookieProtection == CookieProtection.All || cookieProtection == CookieProtection.Encryption) { buf = MachineKeySection.EncryptOrDecryptData (false, buf, null, 0, buf.Length); if (buf == null) return null; } if (cookieProtection == CookieProtection.All || cookieProtection == CookieProtection.Validation) { ////////////////////////////////////////////////////////////////////// // Step 2: Get the MAC: Last 20 bytes if (buf.Length <= 20) return null; byte[] buf2 = new byte[buf.Length - 20]; Buffer.BlockCopy (buf, 0, buf2, 0, buf2.Length); byte[] bMac = MachineKeySection.HashData (buf2, null, 0, buf2.Length); ////////////////////////////////////////////////////////////////////// // Step 3: Make sure the MAC is correct if (bMac == null || bMac.Length != 20) return null; for (int iter = 0; iter < 20; iter++) if (bMac[iter] != buf[buf2.Length + iter]) return null; buf = buf2; } return buf; } } }
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