csharp C＃AES 256位加密加密SSN

Posted 2021-05-12

static void Main()
        {
            string ssn = "33-11-4444";
            string password = genPassword();
            string encryptedTxt = EncryptText(ssn, password);
            string decryptedTxt = DecryptText(encryptedTxt, password);

            Console.WriteLine("Password: " + password);
            Console.WriteLine("Encrypted text: " + encryptedTxt);
            Console.WriteLine("Decrypted text: " + decryptedTxt);

            Console.ReadLine();
        }

        public static string genPassword()
        {
            var random = new RNGCryptoServiceProvider();

            // Maximum length of salt
            int max_length = 32;

            // Empty salt array
            byte[] salt = new byte[max_length];

            // Build the random bytes
            random.GetNonZeroBytes(salt);

            // Return the string encoded salt
            return Convert.ToBase64String(salt);
        }

        public static string EncryptText(string input, string password)
        {
            // Get the bytes of the string
            byte[] bytesToBeEncrypted = Encoding.UTF8.GetBytes(input);
            // Hash the password with SHA256
            byte[] passwordBytes = SHA256.Create().ComputeHash(Encoding.UTF8.GetBytes(password));
            byte[] bytesEncrypted = null;
            // The salt bytes must be at least 8 bytes. Private key
            byte[] saltBytes = new byte[] { 111, 27, 3, 11, 18, 4, 19, 27 };

            using (MemoryStream ms = new MemoryStream())
            {
                using (RijndaelManaged AES = new RijndaelManaged())
                {
                    AES.KeySize = 256;
                    AES.BlockSize = 128;

                    var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
                    AES.Key = key.GetBytes(AES.KeySize / 8);
                    AES.IV = key.GetBytes(AES.BlockSize / 8);

                    AES.Mode = CipherMode.CBC;

                    using (var cs = new CryptoStream(ms, AES.CreateEncryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);
                        cs.Close();
                    }
                    bytesEncrypted = ms.ToArray();
                }
            }

            return Convert.ToBase64String(bytesEncrypted);
        }

        public static string DecryptText(string input, string password)
        {
            // Get the bytes of the string
            byte[] bytesToBeDecrypted = Convert.FromBase64String(input);
            byte[] passwordBytes = SHA256.Create().ComputeHash(Encoding.UTF8.GetBytes(password));
            byte[] bytesDecrypted = null;
            // The salt bytes must be at least 8 bytes. Private key.
            byte[] saltBytes = new byte[] { 111, 27, 3, 11, 18, 4, 19, 27 };

            using (MemoryStream ms = new MemoryStream())
            {
                using (RijndaelManaged AES = new RijndaelManaged())
                {
                    AES.KeySize = 256;
                    AES.BlockSize = 128;

                    var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
                    AES.Key = key.GetBytes(AES.KeySize / 8);
                    AES.IV = key.GetBytes(AES.BlockSize / 8);
                    AES.Mode = CipherMode.CBC;

                    using (var cs = new CryptoStream(ms, AES.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(bytesToBeDecrypted, 0, bytesToBeDecrypted.Length);
                        cs.Close();
                    }
                    bytesDecrypted = ms.ToArray();
                }
            }

            return Encoding.UTF8.GetString(bytesDecrypted);
        }