Encryption between platforms

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If I encrypt from windows, browser or native, app doesn't decrypt on android.
If I encrypt from linux, app does decrypt succesfully on android.
Do you know how to create functions, encrypt and decrypt, platform independent?

Here the code:

String encryptAES(String originalText, Key secretKey) {
  final encrypter = Encrypter(AES(secretKey, mode: AESMode.cbc));
  final encrypted = encrypter.encrypt(originalText, iv: IV.fromLength(16));
  return encrypted.base64;
}

String decryptAES(String encryptedText, Key secretKey) {
  final encrypter = Encrypter(AES(secretKey, mode: AESMode.cbc));
  final encrypted = Encrypted.fromBase64(encryptedText);
  final decrypted = encrypter.decrypt(encrypted, iv: IV.fromLength(16));
  return decrypted;
}