79 lines
2.8 KiB
C#
79 lines
2.8 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using System.Threading.Tasks;
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namespace SafeMobileLib
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{
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public class TripleDESEncryption
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{
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//Encryption Key
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private byte[] EncryptionKey { get; set; }
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// The Initialization Vector for the DES encryption routine
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private byte[] IV { get; set; }
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public TripleDESEncryption()
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{
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String encryptionKey ="sPBAq4EqProzr6sQEfF1CJy6";
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String IV = "z3LgLZQU";
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Initialize(encryptionKey, IV);
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}
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/// Constructor for TripleDESImplementation class
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/// </summary>
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/// <param name="encryptionKey">The 24-byte encryption key (24 character ASCII)</param>
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/// <param name="IV">The 8-byte DES encryption initialization vector (8 characters ASCII)</param>
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public TripleDESEncryption(string encryptionKey, string IV)
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{
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Initialize(encryptionKey, IV);
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}
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public void Initialize(string encryptionKey, string IV)
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{
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if (string.IsNullOrEmpty(encryptionKey))
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{
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throw new ArgumentNullException("'encryptionKey' parameter cannot be null.", "encryptionKey");
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}
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if (string.IsNullOrEmpty(IV))
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{
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throw new ArgumentException("'IV' parameter cannot be null or empty.", "IV");
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}
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EncryptionKey = Encoding.ASCII.GetBytes(encryptionKey);
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// Ensures length of 24 for encryption key
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Trace.Assert(EncryptionKey.Length == 24, "Encryption key must be exactly 24 characters of ASCII text (24 bytes)");
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this.IV = Encoding.ASCII.GetBytes(IV);
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// Ensures length of 8 for init. vector
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Trace.Assert(IV.Length == 8, "Init. vector must be exactly 8 characters of ASCII text (8 bytes)");
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}
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/// Encrypts a text block
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public string Encrypt(string textToEncrypt)
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{
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TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
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tdes.Key = EncryptionKey;
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tdes.IV = IV;
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byte[] buffer = Encoding.ASCII.GetBytes(textToEncrypt);
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return Convert.ToBase64String(tdes.CreateEncryptor().TransformFinalBlock(buffer, 0, buffer.Length));
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}
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/// Decrypts an encrypted text block
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public string Decrypt(string textToDecrypt)
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{
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byte[] buffer = Convert.FromBase64String(textToDecrypt);
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TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
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des.Key = EncryptionKey;
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des.IV = IV;
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return Encoding.ASCII.GetString(des.CreateDecryptor().TransformFinalBlock(buffer, 0, buffer.Length));
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}
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}
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}
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