'Software Secure needs to have both UserPhoto and PhotoID decrypted in
the same manner. So even though this is going to be the same for every
request, we\'re also using RSA encryption to encrypt the AES key for
faces.'

def _encrypted_user_photo_key_str(self):

    face_aes_key_str = settings.VERIFY_STUDENT['SOFTWARE_SECURE']['FACE_IMAGE_AES_KEY']
    face_aes_key = face_aes_key_str.decode('hex')
    rsa_key_str = settings.VERIFY_STUDENT['SOFTWARE_SECURE']['RSA_PUBLIC_KEY']
    rsa_encrypted_face_aes_key = rsa_encrypt(face_aes_key, rsa_key_str)
    return rsa_encrypted_face_aes_key.encode('base64')
