Winify – Blame information for rev 41

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14 office 1 ///////////////////////////////////////////////////////////////////////////
2 // Copyright (C) Wizardry and Steamworks 2016 - License: GNU GPLv3 //
3 // Please see: http://www.gnu.org/licenses/gpl.html for legal details, //
4 // rights of fair usage, the disclaimer and warranty conditions. //
5 ///////////////////////////////////////////////////////////////////////////
6  
7 using System.IO;
8 using System.Linq;
9 using System.Security.Cryptography;
41 office 10 using System.Threading.Tasks;
14 office 11  
12 namespace Winify.Utilities
13 {
14 public static class AES
15 {
16 #region Static Fields and Constants
17  
18 private const int AESKeySaltBytes = 16;
19  
20 private static readonly RNGCryptoServiceProvider Rng = new RNGCryptoServiceProvider();
21  
22 #endregion
23  
24 #region Public Methods
25  
26 ///////////////////////////////////////////////////////////////////////////
27 // Copyright (C) Wizardry and Steamworks 2016 - License: GNU GPLv3 //
28 ///////////////////////////////////////////////////////////////////////////
41 office 29 public static async Task<byte[]> Encrypt(byte[] plain, string password)
14 office 30 {
31 using (var rijndael = Rijndael.Create())
32 {
33 rijndael.BlockSize = 128;
34 rijndael.Mode = CipherMode.CBC;
35 rijndael.KeySize = 256;
36 rijndael.Padding = PaddingMode.PKCS7;
37 var salt = new byte[AESKeySaltBytes];
38 Rng.GetBytes(salt);
41 office 39 using (var pdb = new Rfc2898DeriveBytes(password, salt, 1000))
40 {
41 rijndael.Key = pdb.GetBytes(rijndael.KeySize / 8);
42 rijndael.IV = pdb.GetBytes(rijndael.BlockSize / 8);
14 office 43  
41 office 44 using (var memoryStream = new MemoryStream())
14 office 45 {
41 office 46 using (var cryptoStream =
47 new CryptoStream(memoryStream, rijndael.CreateEncryptor(), CryptoStreamMode.Write))
48 {
49 await cryptoStream.WriteAsync(plain, 0, plain.Length);
50 cryptoStream.Close();
14 office 51  
41 office 52 var ciphertext = memoryStream.ToArray();
14 office 53  
41 office 54 return salt.Concat(ciphertext).ToArray();
55 }
14 office 56 }
57 }
58 }
59 }
60  
61 ///////////////////////////////////////////////////////////////////////////
62 // Copyright (C) Wizardry and Steamworks 2016 - License: GNU GPLv3 //
63 ///////////////////////////////////////////////////////////////////////////
41 office 64 public static async Task<byte[]> Decrypt(byte[] cipher, string password)
14 office 65 {
66 using (var rijndael = Rijndael.Create())
67 {
68 rijndael.BlockSize = 128;
69 rijndael.Mode = CipherMode.CBC;
70 rijndael.KeySize = 256;
71 rijndael.Padding = PaddingMode.PKCS7;
72  
41 office 73 var salt = cipher.Take(AESKeySaltBytes).ToArray();
14 office 74  
41 office 75 var ciphertext = cipher.Skip(AESKeySaltBytes).ToArray();
14 office 76  
41 office 77 using (var pdb = new Rfc2898DeriveBytes(password, salt, 1000))
78 {
79 rijndael.Key = pdb.GetBytes(rijndael.KeySize / 8);
80 rijndael.IV = pdb.GetBytes(rijndael.BlockSize / 8);
14 office 81  
41 office 82 using (var memoryStream = new MemoryStream())
14 office 83 {
41 office 84 using (var cryptoStream =
85 new CryptoStream(memoryStream, rijndael.CreateDecryptor(), CryptoStreamMode.Write))
86 {
87 await cryptoStream.WriteAsync(ciphertext, 0, ciphertext.Length);
88 cryptoStream.Close();
14 office 89  
41 office 90 return memoryStream.ToArray();
91 }
14 office 92 }
93 }
94 }
95 }
96  
97 #endregion
98 }
99 }