1+ using System ;
2+ using System . Collections . Generic ;
3+ using System . Linq ;
4+ using System . Web ;
5+ using System . Security . Cryptography ;
6+ using System . Text ;
7+ using System . IO ;
8+
9+ namespace Encrypt_JavaScript_Decrypt_Csharp
10+ {
11+ public class AESEncryption
12+ {
13+ public static string DecryptStringAES ( string cipherText )
14+ {
15+
16+ var keybytes = Encoding . UTF8 . GetBytes ( "8080808080808080" ) ;
17+ var iv = Encoding . UTF8 . GetBytes ( "8080808080808080" ) ;
18+
19+ var encrypted = Convert . FromBase64String ( cipherText ) ;
20+ var decriptedFromJavascript = DecryptStringFromBytes ( encrypted , keybytes , iv ) ;
21+ return string . Format ( decriptedFromJavascript ) ;
22+ }
23+
24+ private static string DecryptStringFromBytes ( byte [ ] cipherText , byte [ ] key , byte [ ] iv )
25+ {
26+ // Check arguments.
27+ if ( cipherText == null || cipherText . Length <= 0 )
28+ {
29+ throw new ArgumentNullException ( "cipherText" ) ;
30+ }
31+ if ( key == null || key . Length <= 0 )
32+ {
33+ throw new ArgumentNullException ( "key" ) ;
34+ }
35+ if ( iv == null || iv . Length <= 0 )
36+ {
37+ throw new ArgumentNullException ( "key" ) ;
38+ }
39+
40+ // Declare the string used to hold
41+ // the decrypted text.
42+ string plaintext = null ;
43+
44+ // Create an RijndaelManaged object
45+ // with the specified key and IV.
46+ using ( var rijAlg = new RijndaelManaged ( ) )
47+ {
48+ //Settings
49+ rijAlg . Mode = CipherMode . CBC ;
50+ rijAlg . Padding = PaddingMode . PKCS7 ;
51+ rijAlg . FeedbackSize = 128 ;
52+
53+ rijAlg . Key = key ;
54+ rijAlg . IV = iv ;
55+
56+ // Create a decrytor to perform the stream transform.
57+ var decryptor = rijAlg . CreateDecryptor ( rijAlg . Key , rijAlg . IV ) ;
58+ try
59+ {
60+ // Create the streams used for decryption.
61+ using ( var msDecrypt = new MemoryStream ( cipherText ) )
62+ {
63+ using ( var csDecrypt = new CryptoStream ( msDecrypt , decryptor , CryptoStreamMode . Read ) )
64+ {
65+
66+ using ( var srDecrypt = new StreamReader ( csDecrypt ) )
67+ {
68+ // Read the decrypted bytes from the decrypting stream
69+ // and place them in a string.
70+ plaintext = srDecrypt . ReadToEnd ( ) ;
71+
72+ }
73+
74+ }
75+ }
76+ }
77+ catch
78+ {
79+ plaintext = "keyError" ;
80+ }
81+ }
82+
83+ return plaintext ;
84+ }
85+
86+ private static byte [ ] EncryptStringToBytes ( string plainText , byte [ ] key , byte [ ] iv )
87+ {
88+ // Check arguments.
89+ if ( plainText == null || plainText . Length <= 0 )
90+ {
91+ throw new ArgumentNullException ( "plainText" ) ;
92+ }
93+ if ( key == null || key . Length <= 0 )
94+ {
95+ throw new ArgumentNullException ( "key" ) ;
96+ }
97+ if ( iv == null || iv . Length <= 0 )
98+ {
99+ throw new ArgumentNullException ( "key" ) ;
100+ }
101+ byte [ ] encrypted ;
102+ // Create a RijndaelManaged object
103+ // with the specified key and IV.
104+ using ( var rijAlg = new RijndaelManaged ( ) )
105+ {
106+ rijAlg . Mode = CipherMode . CBC ;
107+ rijAlg . Padding = PaddingMode . PKCS7 ;
108+ rijAlg . FeedbackSize = 128 ;
109+
110+ rijAlg . Key = key ;
111+ rijAlg . IV = iv ;
112+
113+ // Create a decrytor to perform the stream transform.
114+ var encryptor = rijAlg . CreateEncryptor ( rijAlg . Key , rijAlg . IV ) ;
115+
116+ // Create the streams used for encryption.
117+ using ( var msEncrypt = new MemoryStream ( ) )
118+ {
119+ using ( var csEncrypt = new CryptoStream ( msEncrypt , encryptor , CryptoStreamMode . Write ) )
120+ {
121+ using ( var swEncrypt = new StreamWriter ( csEncrypt ) )
122+ {
123+ //Write all data to the stream.
124+ swEncrypt . Write ( plainText ) ;
125+ }
126+ encrypted = msEncrypt . ToArray ( ) ;
127+ }
128+ }
129+ }
130+
131+ // Return the encrypted bytes from the memory stream.
132+ return encrypted ;
133+ }
134+ }
135+ }
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