1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
using System.Security.Cryptography;
using System.Text;
using System;
public class foo {
static byte ToHexValue (char c, bool high)
{
byte v;
if (c >= '0' && c <= '9')
v = (byte) (c - '0');
else if (c >= 'a' && c <= 'f')
v = (byte) (c - 'a' + 10);
else if (c >= 'A' && c <= 'F')
v = (byte) (c - 'A' + 10);
else
throw new ArgumentException ("Invalid hex character");
if (high)
v <<= 4;
return v;
}
internal static byte [] GetBytes (string key, int len)
{
byte [] result = new byte [len / 2];
for (int i = 0; i < len; i += 2)
result [i / 2] = (byte) (ToHexValue (key [i], true) + ToHexValue (key [i + 1], false));
return result;
}
static void decrypt () {
string ans = "NVG3kJkWiFzKHh2UAEDiaY4kvYYUk+z4gEdlv2rZudA=";
string key = "1E14FC86752772F5DB58B99764D0168106D336563D77CCBA";
string salt = "xXsrnq4n1jebmRiC/Ty46g==";
byte[] key_bytes = GetBytes (key, key.Length);
byte[] ans_bytes = Convert.FromBase64String (ans);
byte[] salt_bytes = Convert.FromBase64String (salt);
Console.WriteLine ("encrypted = {0} long, salt = {1} long", ans_bytes.Length, salt_bytes.Length);
SymmetricAlgorithm alg = Rijndael.Create ();
ICryptoTransform decryptor = alg.CreateDecryptor (key_bytes, salt_bytes);
byte[] rv = decryptor.TransformFinalBlock (ans_bytes, 0, ans_bytes.Length);
Console.WriteLine ("decryption result = {0}", Convert.ToBase64String (rv));
Console.WriteLine (Encoding.Unicode.GetString (rv));
}
static void encrypt () {
string ans = "green";
string key = "1E14FC86752772F5DB58B99764D0168106D336563D77CCBA";
string salt = "xXsrnq4n1jebmRiC/Ty46g==";
byte[] key_bytes = GetBytes (key, key.Length);
byte[] ans_bytes = Encoding.Unicode.GetBytes (ans);
byte[] salt_bytes = Convert.FromBase64String (salt);
byte[] buf = new byte[ans_bytes.Length + salt_bytes.Length];
/*Array.Copy (salt_bytes, 0, buf, 0, salt_bytes.Length);*/
Array.Copy (ans_bytes, 0, buf, salt_bytes.Length, ans_bytes.Length);
Console.WriteLine ("before encryption {0}", Convert.ToBase64String (buf));
SymmetricAlgorithm alg = Rijndael.Create ();
ICryptoTransform encryptor = alg.CreateEncryptor (key_bytes, salt_bytes);
Console.WriteLine (Convert.ToBase64String (encryptor.TransformFinalBlock (buf, 0, buf.Length)));
}
public static void Main (string[] args) {
decrypt();
encrypt();
}
}
|
