Commit Graph

6 Commits

Author SHA1 Message Date
Diego Elio Pettenò dd5d7c86d2 Fix up end of file and trailing whitespace.
This can be enforced by pre-commit, but correct it separately to make it easier to review.
2020-06-03 10:56:35 +01:00
Scott Shawcroft 0d8bca92e2
Merge pull request #2810 from dherrada/master
Pyi integration
2020-05-15 10:31:05 -07:00
Sean Cross f9ed3acf6d aesio: specify writable buffers for destination buffers
When calling `AES.decrypt_into()` or `AES.encrypt_into()`, the
destination buffers may be any buffer kind.  However, we currently
aren't checking to make sure the destination buffer is actually
writable.

Specify `MP_BUFFER_WRITE` for the destination buffers of both of these
objects so we don't inadvertently write to immutable data.

Signed-off-by: Sean Cross <sean@xobs.io>
2020-05-15 10:22:42 +08:00
Sean Cross aba36e4abf aesio: use bufinfo rather than mp_str_bytes
In order to accept both `bytes` objects and `bytearray` objects, use a
`bufinfo` construct to retrieve the data rather than
`mp_obj_str_get_data()`.

Signed-off-by: Sean Cross <sean@xobs.io>
2020-05-15 10:16:00 +08:00
Scott Shawcroft 4e8de3c554
Swap sphinx to autoapi and the inline stubs 2020-05-12 17:28:24 -07:00
Sean Cross b168784fa0 aesio: add basic AES encryption and decryption
This adds initial support for an AES module named aesio.  This
implementation supports only a subset of AES modes, namely
ECB, CBC, and CTR modes.

Example usage:

```
>>> import aesio
>>>
>>> key = b'Sixteen byte key'
>>> cipher = aesio.AES(key, aesio.MODE_ECB)
>>> output = bytearray(16)
>>> cipher.encrypt_into(b'Circuit Python!!', output)
>>> output
bytearray(b'E\x14\x85\x18\x9a\x9c\r\x95>\xa7kV\xa2`\x8b\n')
>>>
```

This key is 16-bytes, so it uses AES128.  If your key is 24- or 32-
bytes long, it will switch to AES192 or AES256 respectively.

This has been tested with many of the official NIST test vectors,
such as those used in `pycryptodome` at
39626a5b01/lib/Crypto/SelfTest/Cipher/test_vectors/AES

CTR has not been tested as NIST does not provide test vectors for it.

Signed-off-by: Sean Cross <sean@xobs.io>
2020-05-06 17:40:06 +08:00