mirror of https://github.com/2dust/v2rayN
parent
57f9c8158e
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using System.Security.Cryptography;
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using System.Text;
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namespace ServiceLib.Common
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{
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public class DesUtils
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{
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/// <summary>
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/// Encrypt
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/// </summary>
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/// <param name="text"></param>
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/// /// <param name="key"></param>
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/// <returns></returns>
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public static string Encrypt(string? text, string? key = null)
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{
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if (text.IsNullOrEmpty())
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{
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return string.Empty;
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}
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GetKeyIv(key ?? GetDefaultKey(), out var rgbKey, out var rgbIv);
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var dsp = DES.Create();
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using var memStream = new MemoryStream();
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using var cryStream = new CryptoStream(memStream, dsp.CreateEncryptor(rgbKey, rgbIv), CryptoStreamMode.Write);
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using var sWriter = new StreamWriter(cryStream);
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sWriter.Write(text);
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sWriter.Flush();
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cryStream.FlushFinalBlock();
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memStream.Flush();
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return Convert.ToBase64String(memStream.GetBuffer(), 0, (int)memStream.Length);
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}
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/// <summary>
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/// Decrypt
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/// </summary>
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/// <param name="encryptText"></param>
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/// <param name="key"></param>
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/// <returns></returns>
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public static string Decrypt(string? encryptText, string? key = null)
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{
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if (encryptText.IsNullOrEmpty())
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{
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return string.Empty;
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}
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GetKeyIv(key ?? GetDefaultKey(), out var rgbKey, out var rgbIv);
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var dsp = DES.Create();
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var buffer = Convert.FromBase64String(encryptText);
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using var memStream = new MemoryStream();
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using var cryStream = new CryptoStream(memStream, dsp.CreateDecryptor(rgbKey, rgbIv), CryptoStreamMode.Write);
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cryStream.Write(buffer, 0, buffer.Length);
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cryStream.FlushFinalBlock();
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return Encoding.UTF8.GetString(memStream.ToArray());
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}
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private static void GetKeyIv(string key, out byte[] rgbKey, out byte[] rgbIv)
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{
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if (key.IsNullOrEmpty())
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{
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throw new ArgumentNullException("The key cannot be null");
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}
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if (key.Length <= 8)
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{
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throw new ArgumentNullException("The key length cannot be less than 8 characters.");
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}
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rgbKey = Encoding.ASCII.GetBytes(key.Substring(0, 8));
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rgbIv = Encoding.ASCII.GetBytes(key.Insert(0, "w").Substring(0, 8));
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}
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private static string GetDefaultKey()
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{
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return Utils.GetMd5(Utils.GetHomePath() + "DesUtils");
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}
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}
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}
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