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2024-01-08 13:57:27 -07:00
parent 84ad97ac6e
commit 4e3f06bb44
35 changed files with 1914 additions and 884 deletions
--- a/Helpers/RijndaelEncryption.cs
+++ b/Helpers/RijndaelEncryption.cs
@ -0,0 +1,100 @@
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace File_Folder_Helper.Helpers;
+
+public static class RijndaelEncryption
+{ // cSpell:disable
+
+    /// <summary>
+    /// Change the input key GUID when you use this code in your own program.
+    /// Keep this input key very safe and prevent someone from decoding it some way!!
+    /// Generated 2021-08-10
+    /// </summary>
+    internal const string _InputKey = "970CCEF6-4307-4F6A-9AC8-377DADB889BD";
+
+    /// <summary>
+    /// Encrypt the given text and give the byte array back as a BASE64 string
+    /// </summary>
+    /// <param name="text">The text to encrypt</param>
+    /// <param name="salt">The password salt</param>
+    /// <returns>The encrypted text</returns>
+    public static string Encrypt(string text, string salt)
+    {
+        string result;
+        if (string.IsNullOrEmpty(text))
+            throw new ArgumentNullException(nameof(text));
+#pragma warning disable SYSLIB0022
+        RijndaelManaged aesAlg = NewRijndaelManaged(salt);
+#pragma warning restore
+        ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
+        MemoryStream msEncrypt = new();
+        using (CryptoStream csEncrypt = new(msEncrypt, encryptor, CryptoStreamMode.Write))
+        using (StreamWriter swEncrypt = new(csEncrypt))
+            swEncrypt.Write(text);
+        result = Convert.ToBase64String(msEncrypt.ToArray());
+        return result;
+    }
+
+    /// <summary>
+    /// Checks if a string is base64 encoded
+    /// </summary>
+    /// <param name="base64String">The base64 encoded string</param>
+    /// <returns></returns>
+    public static bool IsBase64String(string base64String)
+    {
+        bool result;
+        base64String = base64String.Trim();
+#pragma warning restore
+        result = (base64String.Length % 4 == 0) && Regex.IsMatch(base64String, @"^[a-zA-Z0-9\+/]*={0,3}$", RegexOptions.None);
+#pragma warning restore
+        return result;
+    }
+
+    /// <summary>
+    /// Decrypts the given text
+    /// </summary>
+    /// <param name="cipherText">The encrypted BASE64 text</param>
+    /// <param name="salt">The password salt</param>
+    /// <returns>De gedecrypte text</returns>
+    public static string Decrypt(string cipherText, string salt)
+    {
+        if (string.IsNullOrEmpty(cipherText))
+            throw new ArgumentNullException(nameof(cipherText));
+        if (!IsBase64String(cipherText))
+            throw new Exception("The cipherText input parameter is not base64 encoded");
+        string text;
+#pragma warning disable SYSLIB0022
+        RijndaelManaged aesAlg = NewRijndaelManaged(salt);
+#pragma warning restore
+        ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
+        byte[] cipher = Convert.FromBase64String(cipherText);
+        using (MemoryStream msDecrypt = new(cipher))
+        {
+            using CryptoStream csDecrypt = new(msDecrypt, decryptor, CryptoStreamMode.Read);
+            using StreamReader srDecrypt = new(csDecrypt);
+            text = srDecrypt.ReadToEnd();
+        }
+        return text;
+    }
+
+    /// <summary>
+    /// Create a new RijndaelManaged class and initialize it
+    /// </summary>
+    /// <param name="salt">The password salt</param>
+    /// <returns></returns>
+#pragma warning disable SYSLIB0022, SYSLIB0041, CA5379
+    private static RijndaelManaged NewRijndaelManaged(string salt)
+    {
+        ArgumentNullException.ThrowIfNull(salt);
+        byte[] saltBytes = Encoding.ASCII.GetBytes(salt);
+        Rfc2898DeriveBytes key = new(_InputKey, saltBytes);
+        RijndaelManaged aesAlg = new();
+#pragma warning restore
+        aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8);
+        aesAlg.IV = key.GetBytes(aesAlg.BlockSize / 8);
+        return aesAlg;
+    }
+
+}