70 lines
2.1 KiB
C#
70 lines
2.1 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Web.Security;
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namespace Umbraco.Web
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{
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public static class StringExtensions
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{
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/// <summary>
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/// Encrypt the string using the MachineKey in medium trust
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/// </summary>
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/// <param name="value">The string value to be encrypted.</param>
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/// <returns>The encrypted string.</returns>
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public static string EncryptWithMachineKey(this string value)
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{
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if (value == null)
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return null;
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string valueToEncrypt = value;
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List<string> parts = new List<string>();
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const int EncrpytBlockSize = 500;
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while (valueToEncrypt.Length > EncrpytBlockSize)
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{
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parts.Add(valueToEncrypt.Substring(0, EncrpytBlockSize));
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valueToEncrypt = valueToEncrypt.Remove(0, EncrpytBlockSize);
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}
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if (valueToEncrypt.Length > 0)
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{
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parts.Add(valueToEncrypt);
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}
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StringBuilder encrpytedValue = new StringBuilder();
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foreach (var part in parts)
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{
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var encrpytedBlock = FormsAuthentication.Encrypt(new FormsAuthenticationTicket(0, string.Empty, DateTime.Now, DateTime.MaxValue, false, part));
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encrpytedValue.AppendLine(encrpytedBlock);
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}
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return encrpytedValue.ToString().TrimEnd();
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}
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/// <summary>
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/// Decrypt the encrypted string using the Machine key in medium trust
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/// </summary>
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/// <param name="value">The string value to be decrypted</param>
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/// <returns>The decrypted string.</returns>
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public static string DecryptWithMachineKey(this string value)
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{
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if (value == null)
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return null;
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string[] parts = value.Split('\n');
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StringBuilder decryptedValue = new StringBuilder();
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foreach (var part in parts)
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{
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decryptedValue.Append(FormsAuthentication.Decrypt(part.TrimEnd()).UserData);
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}
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return decryptedValue.ToString();
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}
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}
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}
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