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我在 Windows 窗体中工作，并且正在开发一个允许您使用 AES 加密/解密字符串的应用程序，但我遇到了问题。如何向用户显示 AES 密钥？如果他要加密字符串，他需要 AES 密钥来解密它。我正在将密钥字节数组转换为字符串以在 TextBox 中将其显示给用户，但我不知道如何从 TextBox 获取此密钥以解密字符串，因为它是字符串，而不是字节数组：/（如果你没有知道我在说什么 bcs 我的英语不好，请在评论中询问 xD）

这就是我加密我的字符串并解密的方式

static byte[] EncryptStringToBytes_Aes(string plainText, byte[] Key, byte[] IV) {
            // Check arguments.
            if (plainText == null || plainText.Length <= 0)
                throw new ArgumentNullException("plainText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("IV");
            byte[] encrypted;

            // Create an Aes object
            // with the specified key and IV.

            using (Aes aesAlg = Aes.Create()) {
                aesAlg.Mode = CipherMode.CBC;
                aesAlg.KeySize = 128;
                aesAlg.BlockSize = 128;
                aesAlg.FeedbackSize = 128;
                aesAlg.Padding = PaddingMode.Zeros;
                aesAlg.Key = Key;
                aesAlg.IV = IV;

                // Create an encryptor to perform the stream transform.
                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

                // Create the streams used for encryption.
                using (MemoryStream msEncrypt = new MemoryStream()) {
                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)) {
                        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt)) {
                            //Write all data to the stream.
                            swEncrypt.Write(plainText);
                        }
                        encrypted = msEncrypt.ToArray();
                    }
                }
            }

            // Return the encrypted bytes from the memory stream.
            return encrypted;
        }

        static string DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key, byte[] IV) {
            // Check arguments.
            if (cipherText == null || cipherText.Length <= 0)
                throw new ArgumentNullException("cipherText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("IV");

            // Declare the string used to hold
            // the decrypted text.
            string plaintext = null;

            // Create an Aes object
            // with the specified key and IV.
            using (Aes aesAlg = Aes.Create()) {
                aesAlg.Mode = CipherMode.CBC;
                aesAlg.KeySize = 128;
                aesAlg.BlockSize = 128;
                aesAlg.FeedbackSize = 128;
                aesAlg.Padding = PaddingMode.Zeros;
                aesAlg.Key = Key;
                aesAlg.IV = IV;

                // Create a decryptor to perform the stream transform.
                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

                // Create the streams used for decryption.
                using (MemoryStream msDecrypt = new MemoryStream(cipherText)) {
                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)) {
                        using (StreamReader srDecrypt = new StreamReader(csDecrypt)) {

                            // Read the decrypted bytes from the decrypting stream
                            // and place them in a string.
                            plaintext = srDecrypt.ReadToEnd();
                        }
                    }
                }
            }

            return plaintext;
        }```
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