105 lines
3.1 KiB
C#
105 lines
3.1 KiB
C#
using System.Security.Cryptography;
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using System.Text;
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using Microsoft.IdentityModel.Tokens;
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namespace FoodsharingSiegen.Contracts.Helper
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{
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public static class Cryptor
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{
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/// <summary>
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/// The signing key
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/// </summary>
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private const string SigningKey = "2uasw2§$%1nd47n9s43&%Zs3529s23&/%AW";
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#region Public Method TryDecrypt
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/// <summary>
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/// Decrypts the crypted text (a. beging, 04.04.2022)
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/// </summary>
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/// <param name="cryptedText">The crypted text</param>
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/// <param name="plainText"></param>
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/// <returns>The string</returns>
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public static bool TryDecrypt(string cryptedText, out string plainText)
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{
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plainText = string.Empty;
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try
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{
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CreateAlgorithm(out var tripleDes);
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var toEncryptArray = Convert.FromBase64String(cryptedText);
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var cTransform = tripleDes.CreateDecryptor();
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var resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
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tripleDes.Clear();
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plainText = Encoding.UTF8.GetString(resultArray);
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return true;
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}
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catch (Exception)
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{
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return false;
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}
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}
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#endregion
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#region Public Method Encrypt
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/// <summary>
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/// Encrypts the plain text (a. beging, 04.04.2022)
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/// </summary>
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/// <param name="plainText">The plain text</param>
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/// <returns>The string</returns>
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public static string Encrypt(string plainText)
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{
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CreateAlgorithm(out var tripleDes);
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var toEncryptArray = Encoding.UTF8.GetBytes(plainText );
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var cTransform = tripleDes.CreateEncryptor();
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var resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
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tripleDes.Clear();
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return Convert.ToBase64String(resultArray, 0, resultArray.Length);
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}
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#endregion
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#region Private Method GetSigningKey
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/// <summary>
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/// Gets the signing key (a. beging, 04.04.2022)
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/// </summary>
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/// <returns>The security key</returns>
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public static SecurityKey GetSigningKey() => new SymmetricSecurityKey(Encoding.ASCII.GetBytes(SigningKey));
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#endregion
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#region Private Method CreateAlgorithm
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/// <summary>
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/// Creates the algorithm using the specified triple des (a. beging, 04.04.2022)
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/// </summary>
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/// <param name="tripleDes">The triple des</param>
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private static void CreateAlgorithm(out TripleDES tripleDes)
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{
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var md5 = MD5.Create();
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var keyArray = md5.ComputeHash(Encoding.UTF8.GetBytes(SigningKey));
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md5.Clear();
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tripleDes = TripleDES.Create();
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tripleDes.Key = keyArray;
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tripleDes.Mode = CipherMode.ECB;
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tripleDes.Padding = PaddingMode.PKCS7;
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}
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#endregion
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}
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} |