public static string EncryptString(string text, string keyString) { var key = Encoding.UTF8.GetBytes(keyString); using (var aesAlg = Aes.Create()) { using (var encryptor = aesAlg.CreateEncryptor(key, aesAlg.IV)) { using (var msEncrypt = new MemoryStream()) { using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)) using (var swEncrypt = new StreamWriter(csEncrypt)) { swEncrypt.Write(text); } var iv = aesAlg.IV; var decryptedContent = msEncrypt.ToArray(); var result = new byte[iv.Length + decryptedContent.Length]; Buffer.BlockCopy(iv, 0, result, 0, iv.Length); Buffer.BlockCopy(decryptedContent, 0, result, iv.Length, decryptedContent.Length); return Convert.ToBase64String(result); } } } } public static string DecryptString(string cipherText, string keyString) { var fullCipher = Convert.FromBase64String(cipherText); var iv = new byte[16]; var cipher = new byte[16]; Buffer.BlockCopy(fullCipher, 0, iv, 0, iv.Length); Buffer.BlockCopy(fullCipher, iv.Length, cipher, 0, iv.Length); var key = Encoding.UTF8.GetBytes(keyString); using (var aesAlg = Aes.Create()) { using (var decryptor = aesAlg.CreateDecryptor(key, iv)) { string result; using (var msDecrypt = new MemoryStream(cipher)) { using (var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)) { using (var srDecrypt = new StreamReader(csDecrypt)) { result = srDecrypt.ReadToEnd(); } } } return result; } } }
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