79 lines
3.1 KiB
C#
79 lines
3.1 KiB
C#
using System;
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using System.IO;
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using System.Security.Cryptography;
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namespace FSI.Lib.DeEncryptString
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{
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public static class DeEncrypt
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{
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/// <summary>
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/// Encrypts the string.
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/// </summary>
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/// <param name="clearText">The clear text.</param>
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/// <param name="Key">The key.</param>
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/// <param name="IV">The IV.</param>
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/// <returns></returns>
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private static byte[] CryptString(byte[] clearText, byte[] Key, byte[] IV)
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{
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MemoryStream ms = new MemoryStream();
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Rijndael alg = Rijndael.Create();
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alg.Key = Key;
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alg.IV = IV;
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CryptoStream cs = new CryptoStream(ms, alg.CreateEncryptor(), CryptoStreamMode.Write);
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cs.Write(clearText, 0, clearText.Length);
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cs.Close();
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byte[] encryptedData = ms.ToArray();
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return encryptedData;
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}
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/// <summary>
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/// Encrypts the string.
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/// </summary>
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/// <param name="clearText">The clear text.</param>
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/// <param name="Password">The password.</param>
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/// <returns></returns>
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public static string CryptString(string clearText, string Password)
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{
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byte[] clearBytes = System.Text.Encoding.Unicode.GetBytes(clearText);
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PasswordDeriveBytes pdb = new PasswordDeriveBytes(Password, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
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byte[] encryptedData = CryptString(clearBytes, pdb.GetBytes(32), pdb.GetBytes(16));
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return Convert.ToBase64String(encryptedData);
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}
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/// <summary>
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/// Decrypts the string.
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/// </summary>
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/// <param name="cipherData">The cipher data.</param>
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/// <param name="Key">The key.</param>
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/// <param name="IV">The IV.</param>
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/// <returns></returns>
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private static byte[] DecryptString(byte[] cipherData, byte[] Key, byte[] IV)
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{
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MemoryStream ms = new MemoryStream();
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var alg = Rijndael.Create();
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alg.Key = Key;
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alg.IV = IV;
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CryptoStream cs = new CryptoStream(ms, alg.CreateDecryptor(), CryptoStreamMode.Write);
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cs.Write(cipherData, 0, cipherData.Length);
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cs.Close();
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byte[] decryptedData = ms.ToArray();
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return decryptedData;
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}
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/// <summary>
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/// Decrypts the string.
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/// </summary>
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/// <param name="cipherText">The cipher text.</param>
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/// <param name="Password">The password.</param>
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/// <returns></returns>
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public static string DecryptString(string cipherText, string Password)
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{
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byte[] cipherBytes = Convert.FromBase64String(cipherText);
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PasswordDeriveBytes pdb = new PasswordDeriveBytes(Password, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
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byte[] decryptedData = DecryptString(cipherBytes, pdb.GetBytes(32), pdb.GetBytes(16));
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return System.Text.Encoding.Unicode.GetString(decryptedData);
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}
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}
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}
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