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Documents Helpers.cs

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Cyberboss
2017-10-18 12:14:17 -04:00
parent 667292313a
commit 7a4a90d824
1 changed files with 22 additions and 7 deletions
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TGServiceInterface/Helpers.cs
+22 -7
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@@ -4,26 +4,41 @@ using System.Text;
namespace TGServiceInterface
{
/// <summary>
/// Helper functions used across the server suite
/// </summary>
public static class Helpers
{
public static string EncryptData(string data, out string sentropy)
/// <summary>
/// Takes some <paramref name="cleartext"/> and returns an encrypted version along with the <paramref name="entropy"/> required to decrypt it
/// </summary>
/// <param name="cleartext">The <see cref="string"/> to encrypt</param>
/// <param name="entropy">The entropy required the decrypt the ciphertext</param>
/// <returns>Ciphertext for the <paramref name="cleartext"/></returns>
public static string EncryptData(string cleartext, out string entropy)
{
// Generate additional entropy (will be used as the Initialization vector)
byte[] entropy = new byte[20];
byte[] bentropy = new byte[20];
using (var rng = new RNGCryptoServiceProvider())
rng.GetBytes(entropy);
rng.GetBytes(bentropy);
byte[] ciphertext = ProtectedData.Protect(Encoding.UTF8.GetBytes(data), entropy, DataProtectionScope.CurrentUser);
byte[] ciphertext = ProtectedData.Protect(Encoding.UTF8.GetBytes(data), bentropy, DataProtectionScope.CurrentUser);
sentropy = Convert.ToBase64String(entropy, 0, entropy.Length);
entropy = Convert.ToBase64String(bentropy, 0, bentropy.Length);
return Convert.ToBase64String(ciphertext, 0, ciphertext.Length);
}
public static string DecryptData(string data, string entropy)
/// <summary>
/// Takes ciphertext and entropy from <see cref="EncryptData(string, out string)"/> and returns the cleartext. Note that this only works if the OS user of the program is the same one that called <see cref="EncryptData(string, out string)"/>
/// </summary>
/// <param name="ciphertext">A return value from a previous call to <see cref="EncryptData(string, out string)"/></param>
/// <param name="entropy">The entropy parameter from the previous call to <see cref="EncryptData(string, out string)"/> that returned <paramref name="ciphertext"/></param>
/// <returns>The decrypted <see cref="string"/> on sucess or <see langword="null"/> on failure</returns>
public static string DecryptData(string ciphertext, string entropy)
{
try
{
return Encoding.UTF8.GetString(ProtectedData.Unprotect(Convert.FromBase64String(data), Convert.FromBase64String(entropy), DataProtectionScope.CurrentUser));
return Encoding.UTF8.GetString(ProtectedData.Unprotect(Convert.FromBase64String(ciphertext), Convert.FromBase64String(entropy), DataProtectionScope.CurrentUser));
}
catch
{