docs/development/test-vectors.rst

Test vectors
============

Testing the correctness of the primitives implemented in each ``cryptography``
backend requires trusted test vectors. Where possible these vectors are
obtained from official sources such as `NIST`_ or `IETF`_ RFCs. When this is
not possible ``cryptography`` has chosen to create a set of custom vectors
using an official vector file as input to verify consistency between
implemented backends.

Vectors are kept in the `cryptography_vectors` package rather than within our
main test suite.

Sources
-------

Asymmetric ciphers
~~~~~~~~~~~~~~~~~~

* RSA PKCS #1 from the RSA FTP site (ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/
  and ftp://ftp.rsa.com/pub/rsalabs/tmp/).
* RSA FIPS 186-2 and PKCS1 v1.5 vulnerability test vectors from `NIST CAVP`_.
* FIPS 186-2 and FIPS 186-3 DSA test vectors from `NIST CAVP`_.
* FIPS 186-2 and FIPS 186-3 ECDSA test vectors from `NIST CAVP`_.
* DH and ECDH test vectors from `NIST CAVP`_.
* Ed25519 test vectors from the `Ed25519 website_`.
* OpenSSL PEM RSA serialization vectors from the `OpenSSL example key`_ and
  `GnuTLS key parsing tests`_.
* OpenSSL PEM DSA serialization vectors from the `GnuTLS example keys`_.
* PKCS #8 PEM serialization vectors from

  * GnuTLS: `enc-rsa-pkcs8.pem`_, `enc2-rsa-pkcs8.pem`_, `unenc-rsa-pkcs8.pem`_,
    `pkcs12_s2k_pem.c`_.
  * `Botan's ECC private keys`_.

Hashes
~~~~~~

* MD5 from :rfc:`1321`.
* RIPEMD160 from the `RIPEMD website`_.
* SHA1 from `NIST CAVP`_.
* SHA2 (224, 256, 384, 512) from `NIST CAVP`_.
* Whirlpool from the `Whirlpool website`_.

HMAC
~~~~

* HMAC-MD5 from :rfc:`2202`.
* HMAC-SHA1 from :rfc:`2202`.
* HMAC-RIPEMD160 from :rfc:`2286`.
* HMAC-SHA2 (224, 256, 384, 512) from :rfc:`4231`.

Key derivation functions
~~~~~~~~~~~~~~~~~~~~~~~~

* HKDF (SHA1, SHA256) from :rfc:`5869`.
* PBKDF2 (HMAC-SHA1) from :rfc:`6070`.
* scrypt from the `draft RFC`_.

Recipes
~~~~~~~

* Fernet from its `specification repository`_.

Symmetric ciphers
~~~~~~~~~~~~~~~~~

* AES (CBC, CFB, ECB, GCM, OFB) from `NIST CAVP`_.
* AES CTR from :rfc:`3686`.
* 3DES (CBC, CFB, ECB, OFB) from `NIST CAVP`_.
* ARC4 from :rfc:`6229`.
* Blowfish (CBC, CFB, ECB, OFB) from `Bruce Schneier's vectors`_.
* Camellia (ECB) from NTT's `Camellia page`_ as linked by `CRYPTREC`_.
* Camellia (CBC, CFB, OFB) from `OpenSSL's test vectors`_.
* CAST5 (ECB) from :rfc:`2144`.
* CAST5 (CBC, CFB, OFB) generated by this project.
  See: :doc:`/development/custom-vectors/cast5`
* IDEA (ECB) from the `NESSIE IDEA vectors`_ created by `NESSIE`_.
* IDEA (CBC, CFB, OFB) generated by this project.
  See: :doc:`/development/custom-vectors/idea`
* SEED (ECB) from :rfc:`4269`.
* SEED (CBC) from :rfc:`4196`.
* SEED (CFB, OFB) generated by this project.
  See: :doc:`/development/custom-vectors/seed`

Two factor authentication
~~~~~~~~~~~~~~~~~~~~~~~~~

* HOTP from :rfc:`4226`
* TOTP from :rfc:`6238` (Note that an `errata`_ for the test vectors in RFC
  6238 exists)

CMAC
~~~~

* AES-128, AES-192, AES-256, 3DES from `NIST SP-800-38B`_

Creating test vectors
---------------------

When official vectors are unavailable ``cryptography`` may choose to build
its own using existing vectors as source material. 

Current custom vectors
~~~~~~~~~~~~~~~~~~~~~~

* ec_private_key.pem - Contains an Elliptic Curve key generated by OpenSSL 
  from the curve secp256r1.
* ec_private_key_encrypted.pem - Contains the same Elliptic Curve key as 
  ec_private_key.pem, except that it is encrypted with AES-256 with the 
  password "123456".
* ec_public_key.pem - Contains the public key corresponding to 
  ec_private_key.pem, generated using OpenSSL.
* rsa_private_key.pem - Contains an RSA 2048 bit key generated using 
  OpenSSL, protected by the secret "123456" with DES3 encryption.
* rsa_public_key.pem - Contains an RSA 2048 bit public generated using 
  OpenSSL from rsa_private_key.pem.
* dsaparam.pem - Contains 2048-bit DSA parameters generated using OpenSSL; 
  contains no keys.
* dsa_private_key.pem - Contains a DSA 2048 bit key generated using 
  OpenSSL from the parameters in dsaparam.pem, protected by the secret
  "123456" with DES3 encryption.
* dsa_public_key.pem - Contains a DSA 2048 bit key generated using OpenSSL 
  from dsa_private_key.pem.

.. toctree::
    :maxdepth: 1

    custom-vectors/cast5
    custom-vectors/idea
    custom-vectors/seed

If official test vectors appear in the future the custom generated vectors
should be discarded.

Any vectors generated by this method must also be prefixed with the following
header format (substituting the correct information):

.. code-block:: python

    # CAST5 CBC vectors built for https://github.com/pyca/cryptography
    # Derived from the AESVS MMT test data for CBC
    # Verified against the CommonCrypto and Go crypto packages
    # Key Length : 128

.. _`NIST`: http://www.nist.gov/
.. _`IETF`: https://www.ietf.org/
.. _`NIST CAVP`: http://csrc.nist.gov/groups/STM/cavp/
.. _`Bruce Schneier's vectors`: https://www.schneier.com/code/vectors.txt
.. _`Camellia page`: http://info.isl.ntt.co.jp/crypt/eng/camellia/
.. _`CRYPTREC`: http://www.cryptrec.go.jp
.. _`OpenSSL's test vectors`: https://github.com/openssl/openssl/blob/97cf1f6c2854a3a955fd7dd3a1f113deba00c9ef/crypto/evp/evptests.txt#L232
.. _`RIPEMD website`: http://homes.esat.kuleuven.be/~bosselae/ripemd160.html
.. _`Whirlpool website`: http://www.larc.usp.br/~pbarreto/WhirlpoolPage.html
.. _`draft RFC`: https://tools.ietf.org/html/draft-josefsson-scrypt-kdf-01
.. _`Specification repository`: https://github.com/fernet/spec
.. _`errata`: http://www.rfc-editor.org/errata_search.php?rfc=6238
.. _`OpenSSL example key`: http://git.openssl.org/gitweb/?p=openssl.git;a=blob;f=test/testrsa.pem;h=aad21067a8f7cb93a52a511eb9162fd83be39135;hb=66e8211c0b1347970096e04b18aa52567c325200
.. _`GnuTLS key parsing tests`: https://gitorious.org/gnutls/gnutls/commit/f16ef39ef0303b02d7fa590a37820440c466ce8d
.. _`enc-rsa-pkcs8.pem`: https://gitorious.org/gnutls/gnutls/source/f8d943b38bf74eaaa11d396112daf43cb8aa82ae:tests/pkcs8-decode/encpkcs8.pem
.. _`enc2-rsa-pkcs8.pem`: https://gitorious.org/gnutls/gnutls/source/f8d943b38bf74eaaa11d396112daf43cb8aa82ae:tests/pkcs8-decode/enc2pkcs8.pem
.. _`unenc-rsa-pkcs8.pem`: https://gitorious.org/gnutls/gnutls/source/f8d943b38bf74eaaa11d396112daf43cb8aa82ae:tests/pkcs8-decode/unencpkcs8.pem
.. _`pkcs12_s2k_pem.c`: https://gitorious.org/gnutls/gnutls/source/f8d943b38bf74eaaa11d396112daf43cb8aa82ae:tests/pkcs12_s2k_pem.c
.. _`Botan's ECC private keys`: https://github.com/randombit/botan/tree/4917f26a2b154e841cd27c1bcecdd41d2bdeb6ce/src/tests/data/ecc
.. _`GnuTLS example keys`: https://gitorious.org/gnutls/gnutls/commit/ad2061deafdd7db78fd405f9d143b0a7c579da7b
.. _`NESSIE IDEA vectors`: https://www.cosic.esat.kuleuven.be/nessie/testvectors/bc/idea/Idea-128-64.verified.test-vectors
.. _`NESSIE`: https://en.wikipedia.org/wiki/NESSIE
.. _`Ed25519 website`: http://ed25519.cr.yp.to/software.html
.. _`NIST SP-800-38B`: http://csrc.nist.gov/publications/nistpubs/800-38B/Updated_CMAC_Examples.pdf