How to use the pysodium.crypto_secretstream_xchacha20poly1305_keygen function in pysodium

def test_crypto_secretstream_xchacha20poly1305_push(self):
        if not pysodium.sodium_version_check(1, 0, 15): return

        key = pysodium.crypto_secretstream_xchacha20poly1305_keygen()
        state, header = pysodium.crypto_secretstream_xchacha20poly1305_init_push(key)
        ciphertext = pysodium.crypto_secretstream_xchacha20poly1305_push(state, b"howdy", None, 0)
    #----

def test_crypto_secretstream_xchacha20poly1305_keygen(self):
        if not pysodium.sodium_version_check(1, 0, 15): return

        key = pysodium.crypto_secretstream_xchacha20poly1305_keygen()
        self.assertEqual(len(key), 32)

def test_crypto_secretstream_xchacha20poly1305_pull_changed_ad(self):
        if not pysodium.sodium_version_check(1, 0, 15): return

        key = pysodium.crypto_secretstream_xchacha20poly1305_keygen()
        state, header = pysodium.crypto_secretstream_xchacha20poly1305_init_push(key)
        ciphertext = pysodium.crypto_secretstream_xchacha20poly1305_push(state, b"howdy", b"some data", pysodium.crypto_secretstream_xchacha20poly1305_TAG_FINAL)

        state2 = pysodium.crypto_secretstream_xchacha20poly1305_init_pull(header, key)
        self.assertRaises(ValueError, pysodium.crypto_secretstream_xchacha20poly1305_pull, state2, ciphertext, b"different data")

def test_crypto_secretstream_xchacha20poly1305_pull_multiple(self):
        if not pysodium.sodium_version_check(1, 0, 15): return

        key = pysodium.crypto_secretstream_xchacha20poly1305_keygen()
        state, header = pysodium.crypto_secretstream_xchacha20poly1305_init_push(key)

        ciphertext = pysodium.crypto_secretstream_xchacha20poly1305_push(state, b"Correct Horse Battery Staple", None, 0)
        ciphertext2 = pysodium.crypto_secretstream_xchacha20poly1305_push(state, b"howdy", None, pysodium.crypto_secretstream_xchacha20poly1305_TAG_FINAL)

        # Verify decryption
        state2 = pysodium.crypto_secretstream_xchacha20poly1305_init_pull(header, key)
        msg, tag = pysodium.crypto_secretstream_xchacha20poly1305_pull(state2, ciphertext, None)
        msg2, tag2 = pysodium.crypto_secretstream_xchacha20poly1305_pull(state2, ciphertext2, None)

        self.assertEqual(msg, b"Correct Horse Battery Staple")
        self.assertEqual(tag, 0)

        self.assertEqual(msg2, b"howdy")
        self.assertEqual(tag2, pysodium.crypto_secretstream_xchacha20poly1305_TAG_FINAL)

def test_crypto_secretstream_xchacha20poly1305_pull_corrupted(self):
        if not pysodium.sodium_version_check(1, 0, 15): return

        key = pysodium.crypto_secretstream_xchacha20poly1305_keygen()
        state, header = pysodium.crypto_secretstream_xchacha20poly1305_init_push(key)

        ad = 'additional data'
        ciphertext = pysodium.crypto_secretstream_xchacha20poly1305_push(state, b"Correct Horse Battery Staple", ad, 0)

        # Verify error is raised if cypher text is changed
        state2 = pysodium.crypto_secretstream_xchacha20poly1305_init_pull(header, key)
        self.assertRaises(ValueError, pysodium.crypto_secretstream_xchacha20poly1305_pull, state2, ciphertext + 'this is a corruption'.encode(), ad)

        # Verify error is raised if additional data is changed
        ad2 = 'this is not the same'
        state2 = pysodium.crypto_secretstream_xchacha20poly1305_init_pull(header, key)
        self.assertRaises(ValueError, pysodium.crypto_secretstream_xchacha20poly1305_pull, state2, ciphertext, ad2)

def test_crypto_secretstream_xchacha20poly1305_init_push(self):
        if not pysodium.sodium_version_check(1, 0, 15): return

        key = pysodium.crypto_secretstream_xchacha20poly1305_keygen()
        state, header = pysodium.crypto_secretstream_xchacha20poly1305_init_push(key)

def test_crypto_secretstream_xchacha20poly1305_missing_rekey(self):
        if not pysodium.sodium_version_check(1, 0, 15): return

        key = pysodium.crypto_secretstream_xchacha20poly1305_keygen()
        state, header = pysodium.crypto_secretstream_xchacha20poly1305_init_push(key)

        # Encrypt two messages with intermediate re-key
        ciphertext = pysodium.crypto_secretstream_xchacha20poly1305_push(state, b"Correct Horse Battery Staple", None, 0)
        pysodium.crypto_secretstream_xchacha20poly1305_rekey(state)
        ciphertext2 = pysodium.crypto_secretstream_xchacha20poly1305_push(state, b"howdy", None, pysodium.crypto_secretstream_xchacha20poly1305_TAG_FINAL)

        state2 = pysodium.crypto_secretstream_xchacha20poly1305_init_pull(header, key)
        msg, tag = pysodium.crypto_secretstream_xchacha20poly1305_pull(state2, ciphertext, None)
        # re-key should be here, so following call should fail
        self.assertRaises(ValueError, pysodium.crypto_secretstream_xchacha20poly1305_pull, state2, ciphertext2, None)

def test_crypto_secretstream_xchacha20poly1305_pull(self):
        if not pysodium.sodium_version_check(1, 0, 15): return

        key = pysodium.crypto_secretstream_xchacha20poly1305_keygen()
        state, header = pysodium.crypto_secretstream_xchacha20poly1305_init_push(key)
        ciphertext = pysodium.crypto_secretstream_xchacha20poly1305_push(state, b"howdy", None, pysodium.crypto_secretstream_xchacha20poly1305_TAG_FINAL)

        state2 = pysodium.crypto_secretstream_xchacha20poly1305_init_pull(header, key)
        msg, tag = pysodium.crypto_secretstream_xchacha20poly1305_pull(state2, ciphertext, None)

        self.assertEqual(msg, b"howdy")
        self.assertEqual(tag, pysodium.crypto_secretstream_xchacha20poly1305_TAG_FINAL)

def test_crypto_secretstream_xchacha20poly1305_pull_incorrect_key(self):
        if not pysodium.sodium_version_check(1, 0, 15): return

        key = pysodium.crypto_secretstream_xchacha20poly1305_keygen()
        state, header = pysodium.crypto_secretstream_xchacha20poly1305_init_push(key)
        ciphertext = pysodium.crypto_secretstream_xchacha20poly1305_push(state, b"howdy", None, pysodium.crypto_secretstream_xchacha20poly1305_TAG_FINAL)

        bad_key = pysodium.crypto_secretstream_xchacha20poly1305_keygen()
        state2 = pysodium.crypto_secretstream_xchacha20poly1305_init_pull(header, bad_key)
        self.assertRaises(ValueError, pysodium.crypto_secretstream_xchacha20poly1305_pull, state2, ciphertext, None)

def test_crypto_secretstream_xchacha20poly1305_out_of_order_messeges(self):
        if not pysodium.sodium_version_check(1, 0, 15): return

        key = pysodium.crypto_secretstream_xchacha20poly1305_keygen()
        state, header = pysodium.crypto_secretstream_xchacha20poly1305_init_push(key)

        ciphertext = pysodium.crypto_secretstream_xchacha20poly1305_push(state, b"Correct Horse Battery Staple", None, 0)
        ciphertext2 = pysodium.crypto_secretstream_xchacha20poly1305_push(state, b"howdy", None, pysodium.crypto_secretstream_xchacha20poly1305_TAG_FINAL)

        # Decrypting the second message first should fail
        state2 = pysodium.crypto_secretstream_xchacha20poly1305_init_pull(header, key)
        self.assertRaises(ValueError, pysodium.crypto_secretstream_xchacha20poly1305_pull, state2, ciphertext2, None)