Encrypt and Decrypt by AES algorithm in both python and android

Question

I have python and android code for AES encryption. When I encrypt a text in android, it decrypt on python successfully but it can’t decrypt in android side. Do anyone have an

Answer 1

You're encoding the output after decryption.

public String decrypt_string(final String plain) throws ...
{
    byte[] encryptedBytes = decrypt(Base64.decode(plain, 0));
    return Base64.encodeToString( encryptedBytes, Base64.DEFAULT);
    //     ^--------------------| this 
}

If you only encrypt printable data then you can safely remove the Base64.encodeToString call from the above code. To return the correct type, you can do

return new String(encryptedBytes);