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- public class AES
- {
- Utils utils = new Utils();
- public byte[] AES_Encrypt(byte[] bytesToBeEncrypted, byte[] passwordBytes)
- {
- byte[] encryptedBytes = null;
- // Set your salt here, change it to meet your flavor:
- // The salt bytes must be at least 8 bytes.
- byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
- 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;
- AES.Padding = PaddingMode.Zeros;
- using (var cs = new CryptoStream(ms, AES.CreateEncryptor(), CryptoStreamMode.Write))
- {
- cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);
- cs.Close();
- }
- encryptedBytes = ms.ToArray();
- }
- }
- return encryptedBytes;
- }
- public byte[] AES_Decrypt(byte[] bytesToBeDecrypted, byte[] passwordBytes)
- {
- byte[] decryptedBytes = null;
- // Set your salt here, change it to meet your flavor:
- // The salt bytes must be at least 8 bytes.
- byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
- 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;
- AES.Padding = PaddingMode.Zeros;
- using (var cs = new CryptoStream(ms, AES.CreateDecryptor(), CryptoStreamMode.Write))
- {
- cs.Write(bytesToBeDecrypted, 0, bytesToBeDecrypted.Length);
- cs.Close();
- }
- decryptedBytes = ms.ToArray();
- }
- }
- return decryptedBytes;
- }
- public string EncryptText(string input, string password)
- {
- // Get the bytes of the string
- byte[] bytesToBeEncrypted = Encoding.UTF8.GetBytes(input);
- byte[] passwordBytes = Encoding.UTF8.GetBytes(password);
- // Hash the password with SHA256
- passwordBytes = SHA256.Create().ComputeHash(passwordBytes);
- try
- {
- byte[] bytesEncrypted = AES_Encrypt(bytesToBeEncrypted, passwordBytes);
- string result = Convert.ToBase64String(bytesEncrypted);
- return result;
- }
- catch (Exception e)
- {
- return "Paramêtro inválido";
- }
- }
- public string DecryptText(string input, string password)
- {
- if (utils.IsBase64(input))
- {
- // Get the bytes of the string
- byte[] bytesToBeDecrypted = Convert.FromBase64String(input);
- byte[] passwordBytes = Encoding.UTF8.GetBytes(password);
- passwordBytes = SHA256.Create().ComputeHash(passwordBytes);
- try
- {
- byte[] bytesDecrypted = AES_Decrypt(bytesToBeDecrypted, passwordBytes);
- string result = Encoding.UTF8.GetString(bytesDecrypted);
- return result;
- }
- catch (Exception e)
- {
- return "Paramêtro inválido";
- }
- }
- else
- {
- return "Paramêtro inválido";
- }
- }
- }
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