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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| using System.Security.Cryptography; | ||
| using System.Text; | ||
|
|
||
| namespace ServiceLib.Common | ||
| { | ||
| public class DesUtils | ||
| { | ||
| /// <summary> | ||
| /// Encrypt | ||
| /// </summary> | ||
| /// <param name="text"></param> | ||
| /// /// <param name="key"></param> | ||
| /// <returns></returns> | ||
| public static string Encrypt(string? text, string? key = null) | ||
| { | ||
| if (text.IsNullOrEmpty()) | ||
| { | ||
| return string.Empty; | ||
| } | ||
| GetKeyIv(key ?? GetDefaultKey(), out var rgbKey, out var rgbIv); | ||
| var dsp = DES.Create(); | ||
| using var memStream = new MemoryStream(); | ||
| using var cryStream = new CryptoStream(memStream, dsp.CreateEncryptor(rgbKey, rgbIv), CryptoStreamMode.Write); | ||
| using var sWriter = new StreamWriter(cryStream); | ||
| sWriter.Write(text); | ||
| sWriter.Flush(); | ||
| cryStream.FlushFinalBlock(); | ||
| memStream.Flush(); | ||
| return Convert.ToBase64String(memStream.GetBuffer(), 0, (int)memStream.Length); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Decrypt | ||
| /// </summary> | ||
| /// <param name="encryptText"></param> | ||
| /// <param name="key"></param> | ||
| /// <returns></returns> | ||
| public static string Decrypt(string? encryptText, string? key = null) | ||
| { | ||
| if (encryptText.IsNullOrEmpty()) | ||
| { | ||
| return string.Empty; | ||
| } | ||
| GetKeyIv(key ?? GetDefaultKey(), out var rgbKey, out var rgbIv); | ||
| var dsp = DES.Create(); | ||
| var buffer = Convert.FromBase64String(encryptText); | ||
|
|
||
| using var memStream = new MemoryStream(); | ||
| using var cryStream = new CryptoStream(memStream, dsp.CreateDecryptor(rgbKey, rgbIv), CryptoStreamMode.Write); | ||
| cryStream.Write(buffer, 0, buffer.Length); | ||
| cryStream.FlushFinalBlock(); | ||
| return Encoding.UTF8.GetString(memStream.ToArray()); | ||
| } | ||
|
|
||
| private static void GetKeyIv(string key, out byte[] rgbKey, out byte[] rgbIv) | ||
| { | ||
| if (key.IsNullOrEmpty()) | ||
| { | ||
| throw new ArgumentNullException("The key cannot be null"); | ||
| } | ||
| if (key.Length <= 8) | ||
| { | ||
| throw new ArgumentNullException("The key length cannot be less than 8 characters."); | ||
| } | ||
|
|
||
| rgbKey = Encoding.ASCII.GetBytes(key.Substring(0, 8)); | ||
| rgbIv = Encoding.ASCII.GetBytes(key.Insert(0, "w").Substring(0, 8)); | ||
| } | ||
|
|
||
| private static string GetDefaultKey() | ||
| { | ||
| return Utils.GetMd5(Utils.GetHomePath() + "DesUtils"); | ||
| } | ||
| } | ||
| } |
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