85 lines
2.4 KiB
C#
85 lines
2.4 KiB
C#
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using System.Security.Cryptography;
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using System.Text;
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using System;
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public class foo {
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static byte ToHexValue (char c, bool high)
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{
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byte v;
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if (c >= '0' && c <= '9')
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v = (byte) (c - '0');
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else if (c >= 'a' && c <= 'f')
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v = (byte) (c - 'a' + 10);
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else if (c >= 'A' && c <= 'F')
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v = (byte) (c - 'A' + 10);
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else
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throw new ArgumentException ("Invalid hex character");
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if (high)
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v <<= 4;
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return v;
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}
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internal static byte [] GetBytes (string key, int len)
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{
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byte [] result = new byte [len / 2];
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for (int i = 0; i < len; i += 2)
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result [i / 2] = (byte) (ToHexValue (key [i], true) + ToHexValue (key [i + 1], false));
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return result;
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}
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static void decrypt () {
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string ans = "NVG3kJkWiFzKHh2UAEDiaY4kvYYUk+z4gEdlv2rZudA=";
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string key = "1E14FC86752772F5DB58B99764D0168106D336563D77CCBA";
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string salt = "xXsrnq4n1jebmRiC/Ty46g==";
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byte[] key_bytes = GetBytes (key, key.Length);
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byte[] ans_bytes = Convert.FromBase64String (ans);
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byte[] salt_bytes = Convert.FromBase64String (salt);
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Console.WriteLine ("encrypted = {0} long, salt = {1} long", ans_bytes.Length, salt_bytes.Length);
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SymmetricAlgorithm alg = Rijndael.Create ();
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ICryptoTransform decryptor = alg.CreateDecryptor (key_bytes, salt_bytes);
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byte[] rv = decryptor.TransformFinalBlock (ans_bytes, 0, ans_bytes.Length);
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Console.WriteLine ("decryption result = {0}", Convert.ToBase64String (rv));
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Console.WriteLine (Encoding.Unicode.GetString (rv));
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}
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static void encrypt () {
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string ans = "green";
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string key = "1E14FC86752772F5DB58B99764D0168106D336563D77CCBA";
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string salt = "xXsrnq4n1jebmRiC/Ty46g==";
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byte[] key_bytes = GetBytes (key, key.Length);
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byte[] ans_bytes = Encoding.Unicode.GetBytes (ans);
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byte[] salt_bytes = Convert.FromBase64String (salt);
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byte[] buf = new byte[ans_bytes.Length + salt_bytes.Length];
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/*Array.Copy (salt_bytes, 0, buf, 0, salt_bytes.Length);*/
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Array.Copy (ans_bytes, 0, buf, salt_bytes.Length, ans_bytes.Length);
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Console.WriteLine ("before encryption {0}", Convert.ToBase64String (buf));
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SymmetricAlgorithm alg = Rijndael.Create ();
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ICryptoTransform encryptor = alg.CreateEncryptor (key_bytes, salt_bytes);
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Console.WriteLine (Convert.ToBase64String (encryptor.TransformFinalBlock (buf, 0, buf.Length)));
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}
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public static void Main (string[] args) {
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decrypt();
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encrypt();
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}
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}
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