def test_anybody_can_encrypt():
"""
Similar to anybody_can_verify() above; we show that anybody can encrypt.
"""
everyman = Character()
ursula = Ursula(is_me=False)
cleartext = b"This is Officer Rod Farva. Come in, Ursula! Come in Ursula!"
ciphertext, signature = everyman.encrypt_for(ursula, cleartext, sign=False)
assert signature == NOT_SIGNED
assert ciphertext is not None
def test_signing_only_power_cannot_encrypt():
"""
Similar to the above with signing, here we show that a Character without the EncryptingKeypair
PowerUp can't encrypt.
"""
# Here's somebody who can sign but not encrypt.
can_sign_but_not_encrypt = Character(crypto_power_ups=[SigningPower])
# ..and here's Ursula, for whom our Character above wants to encrypt.
ursula = Ursula()
# They meet.
can_sign_but_not_encrypt.learn_about_actor(ursula)
# The Character has the message ready...
cleartext = "This is Officer Rod Farva. Come in, Ursula! Come in Ursula!"
# But without the proper PowerUp, no encryption happens.
with pytest.raises(NoEncryptingPower) as e_info:
can_sign_but_not_encrypt.encrypt_for(ursula, cleartext)
def test_character_with_encrypting_power_can_encrypt():
"""
Now, a Character *with* EncryptingKeyPair can encrypt.
"""
can_sign_and_encrypt = Character(crypto_power_ups=[SigningPower, EncryptingPower])
ursula = Ursula()
can_sign_and_encrypt.learn_about_actor(ursula)
cleartext = b"This is Officer Rod Farva. Come in, Ursula! Come in Ursula!"
# TODO: Make encrypt_for actually encrypt.
ciphertext, signature = can_sign_and_encrypt.encrypt_for(ursula, cleartext, sign=False)
assert signature == NOT_SIGNED
assert ciphertext is not None # annnd fail.
def test_anybody_can_encrypt():
"""
Similar to anybody_can_verify() above; we show that anybody can encrypt.
"""
can_sign_and_encrypt = Character(
crypto_power_ups=[SigningPower, EncryptingPower])
ursula = Ursula()
cleartext = b"This is Officer Rod Farva. Come in, Ursula! Come in Ursula!"
ciphertext, signature = can_sign_and_encrypt.encrypt_for(ursula,
cleartext,
sign=False)
assert signature == NOT_SIGNED
assert ciphertext is not None