11 files changed, 498 insertions, 8 deletions
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index f8c7eefa..705c09cd 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,6 +6,8 @@ Changelog
 
 .. note:: This version is not yet released and is under active development.
 
+* Added :class:`~cryptography.hazmat.primitives.kdf.x963kdf.X963KDF`.
+
 1.0.1 - 2015-09-05
 ~~~~~~~~~~~~~~~~~~
 
diff --git a/docs/hazmat/bindings/openssl.rst b/docs/hazmat/bindings/openssl.rst
index 446c450c..0ec0a3d6 100644
--- a/docs/hazmat/bindings/openssl.rst
+++ b/docs/hazmat/bindings/openssl.rst
@@ -37,7 +37,7 @@ Threading
 ``cryptography`` enables OpenSSLs `thread safety facilities`_ in two different
 ways depending on the configuration of your system. Normally the locking
 callbacks provided by your Python implementation specifically for OpenSSL will
-be used. However if you have linked ``cryptography`` to a different version of
+be used. However, if you have linked ``cryptography`` to a different version of
 OpenSSL than that used by your Python implementation we enable an alternative
 locking callback. This version is implemented in Python and so may result in
 lower performance in some situations. In particular parallelism is reduced
diff --git a/docs/hazmat/primitives/asymmetric/ec.rst b/docs/hazmat/primitives/asymmetric/ec.rst
index 01671d44..6356c278 100644
--- a/docs/hazmat/primitives/asymmetric/ec.rst
+++ b/docs/hazmat/primitives/asymmetric/ec.rst
@@ -138,7 +138,7 @@ Generally the NIST prime field ("P") curves are significantly faster than the
 other types suggested by NIST at both signing and verifying with ECDSA.
 
 Prime fields also `minimize the number of security concerns for elliptic-curve
-cryptography`_. However there is `some concern`_ that both the prime field and
+cryptography`_. However, there is `some concern`_ that both the prime field and
 binary field ("B") NIST curves may have been weakened during their generation.
 
 Currently `cryptography` only supports NIST curves, none of which are
diff --git a/docs/hazmat/primitives/asymmetric/rsa.rst b/docs/hazmat/primitives/asymmetric/rsa.rst
index e8bbf5ce..a67ea47f 100644
--- a/docs/hazmat/primitives/asymmetric/rsa.rst
+++ b/docs/hazmat/primitives/asymmetric/rsa.rst
@@ -421,7 +421,7 @@ Handling partial RSA private keys
 If you are trying to load RSA private keys yourself you may find that not all
 parameters required by ``RSAPrivateNumbers`` are available. In particular the
 `Chinese Remainder Theorem`_ (CRT) values ``dmp1``, ``dmq1``, ``iqmp`` may be
-missing or present in a different form. For example `OpenPGP`_ does not include
+missing or present in a different form. For example, `OpenPGP`_ does not include
 the ``iqmp``, ``dmp1`` or ``dmq1`` parameters.
 
 The following functions are provided for users who want to work with keys like
diff --git a/docs/hazmat/primitives/key-derivation-functions.rst b/docs/hazmat/primitives/key-derivation-functions.rst
index 35e2dd87..4d95629c 100644
--- a/docs/hazmat/primitives/key-derivation-functions.rst
+++ b/docs/hazmat/primitives/key-derivation-functions.rst
@@ -506,6 +506,99 @@ Different KDFs are suitable for different tasks such as:
         ``key_material`` generates the same key as the ``expected_key``, and
         raises an exception if they do not match.
 
+.. currentmodule:: cryptography.hazmat.primitives.kdf.x963kdf
+
+.. class:: X963KDF(algorithm, length, otherinfo, backend)
+
+    .. versionadded:: 1.1
+
+    X963KDF (ANSI X9.63 Key Derivation Function) is defined by ANSI
+    in the `ANSI X9.63:2001`_ document, to be used to derive keys for use
+    after a Key Exchange negotiation operation.
+
+    SECG in `SEC 1 v2.0`_ recommends that
+    :class:`~cryptography.hazmat.primitives.kdf.concatkdf.ConcatKDFHash` be
+    used for new projects. This KDF should only be used for backwards
+    compatibility with pre-existing protocols.
+
+
+    .. warning::
+
+        X963KDF should not be used for password storage.
+
+    .. doctest::
+
+        >>> import os
+        >>> from cryptography.hazmat.primitives import hashes
+        >>> from cryptography.hazmat.primitives.kdf.x963kdf import X963KDF
+        >>> from cryptography.hazmat.backends import default_backend
+        >>> backend = default_backend()
+        >>> sharedinfo = b"ANSI X9.63 Example"
+        >>> xkdf = X963KDF(
+        ...     algorithm=hashes.SHA256(),
+        ...     length=256,
+        ...     sharedinfo=sharedinfo,
+        ...     backend=backend
+        ... )
+        >>> key = xkdf.derive(b"input key")
+        >>> xkdf = X963KDF(
+        ...     algorithm=hashes.SHA256(),
+        ...     length=256,
+        ...     sharedinfo=sharedinfo,
+        ...     backend=backend
+        ... )
+        >>> xkdf.verify(b"input key", key)
+
+    :param algorithm: An instance of a
+        :class:`~cryptography.hazmat.primitives.hashes.HashAlgorithm`
+        provider
+
+    :param int length: The desired length of the derived key in bytes.
+        Maximum is ``hashlen * (2^32 -1)``.
+
+    :param bytes sharedinfo: Application specific context information.
+        If ``None`` is explicitly passed an empty byte string will be used.
+
+    :param backend: A cryptography backend
+        :class:`~cryptography.hazmat.backends.interfaces.HashBackend`
+        provider.
+
+    :raises cryptography.exceptions.UnsupportedAlgorithm: This is raised
+        if the provided ``backend`` does not implement
+        :class:`~cryptography.hazmat.backends.interfaces.HashBackend`
+
+    :raises TypeError: This exception is raised if ``sharedinfo`` is not
+        ``bytes``.
+
+    .. method:: derive(key_material)
+
+        :param bytes key_material: The input key material.
+        :return bytes: The derived key.
+        :raises TypeError: This exception is raised if ``key_material`` is
+                            not ``bytes``.
+
+        Derives a new key from the input key material.
+
+    .. method:: verify(key_material, expected_key)
+
+        :param bytes key_material: The input key material. This is the same as
+                                   ``key_material`` in :meth:`derive`.
+        :param bytes expected_key: The expected result of deriving a new key,
+                                   this is the same as the return value of
+                                   :meth:`derive`.
+        :raises cryptography.exceptions.InvalidKey: This is raised when the
+                                                    derived key does not match
+                                                    the expected key.
+        :raises cryptography.exceptions.AlreadyFinalized: This is raised when
+                                                          :meth:`derive` or
+                                                          :meth:`verify` is
+                                                          called more than
+                                                          once.
+
+        This checks whether deriving a new key from the supplied
+        ``key_material`` generates the same key as the ``expected_key``, and
+        raises an exception if they do not match.
+
 
 Interface
 ~~~~~~~~~
@@ -556,6 +649,8 @@ Interface
 
 .. _`NIST SP 800-132`: http://csrc.nist.gov/publications/nistpubs/800-132/nist-sp800-132.pdf
 .. _`NIST SP 800-56Ar2`: http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-56Ar2.pdf
+.. _`ANSI X9.63:2001`: https://webstore.ansi.org
+.. _`SEC 1 v2.0`: http://www.secg.org/sec1-v2.pdf
 .. _`Password Storage Cheat Sheet`: https://www.owasp.org/index.php/Password_Storage_Cheat_Sheet
 .. _`PBKDF2`: https://en.wikipedia.org/wiki/PBKDF2
 .. _`scrypt`: https://en.wikipedia.org/wiki/Scrypt
diff --git a/docs/spelling_wordlist.txt b/docs/spelling_wordlist.txt
index 75497840..16aa5ef2 100644
--- a/docs/spelling_wordlist.txt
+++ b/docs/spelling_wordlist.txt
@@ -47,6 +47,7 @@ online
 paddings
 pickleable
 plaintext
+pre
 preprocessor
 preprocessors
 pseudorandom
diff --git a/src/cryptography/hazmat/primitives/kdf/x963kdf.py b/src/cryptography/hazmat/primitives/kdf/x963kdf.py
new file mode 100644
index 00000000..83789b31
--- /dev/null
+++ b/src/cryptography/hazmat/primitives/kdf/x963kdf.py
@@ -0,0 +1,70 @@
+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the BSD License. See the LICENSE file in the root of this repository
+# for complete details.
+
+from __future__ import absolute_import, division, print_function
+
+import struct
+
+from cryptography import utils
+from cryptography.exceptions import (
+    AlreadyFinalized, InvalidKey, UnsupportedAlgorithm, _Reasons
+)
+from cryptography.hazmat.backends.interfaces import HashBackend
+from cryptography.hazmat.primitives import constant_time, hashes
+from cryptography.hazmat.primitives.kdf import KeyDerivationFunction
+
+
+def _int_to_u32be(n):
+    return struct.pack('>I', n)
+
+
+@utils.register_interface(KeyDerivationFunction)
+class X963KDF(object):
+    def __init__(self, algorithm, length, sharedinfo, backend):
+
+        max_len = algorithm.digest_size * (2 ** 32 - 1)
+        if length > max_len:
+            raise ValueError(
+                "Can not derive keys larger than {0} bits.".format(max_len))
+        if not (sharedinfo is None or isinstance(sharedinfo, bytes)):
+            raise TypeError("sharedinfo must be bytes.")
+        self._algorithm = algorithm
+        self._length = length
+        self._sharedinfo = sharedinfo
+
+        if not isinstance(backend, HashBackend):
+            raise UnsupportedAlgorithm(
+                "Backend object does not implement HashBackend.",
+                _Reasons.BACKEND_MISSING_INTERFACE
+            )
+        self._backend = backend
+        self._used = False
+
+    def derive(self, key_material):
+        if self._used:
+            raise AlreadyFinalized
+        self._used = True
+
+        if not isinstance(key_material, bytes):
+            raise TypeError("key_material must be bytes.")
+
+        output = [b""]
+        outlen = 0
+        counter = 1
+
+        while self._length > outlen:
+            h = hashes.Hash(self._algorithm, self._backend)
+            h.update(key_material)
+            h.update(_int_to_u32be(counter))
+            if self._sharedinfo is not None:
+                h.update(self._sharedinfo)
+            output.append(h.finalize())
+            outlen += len(output[-1])
+            counter += 1
+
+        return b"".join(output)[:self._length]
+
+    def verify(self, key_material, expected_key):
+        if not constant_time.bytes_eq(self.derive(key_material), expected_key):
+            raise InvalidKey
diff --git a/tests/hazmat/primitives/test_X963_vectors.py b/tests/hazmat/primitives/test_X963_vectors.py
new file mode 100644
index 00000000..0332e601
--- /dev/null
+++ b/tests/hazmat/primitives/test_X963_vectors.py
@@ -0,0 +1,72 @@
+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the BSD License. See the LICENSE file in the root of this repository
+# for complete details.
+
+from __future__ import absolute_import, division, print_function
+
+import binascii
+import os
+
+import pytest
+
+from cryptography import utils
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.backends.interfaces import HashBackend
+from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.primitives.kdf.x963kdf import X963KDF
+
+from ...utils import load_vectors_from_file, load_x963_vectors
+
+
+@utils.register_interface(hashes.HashAlgorithm)
+class UnsupportedDummyHash(object):
+    name = "unsupported-dummy-hash"
+    block_size = None
+    digest_size = None
+
+
+def _skip_hashfn_unsupported(backend, hashfn):
+    if not backend.hash_supported(hashfn):
+        pytest.skip(
+            "Hash {0} is not supported by this backend {1}".format(
+                hashfn.name, backend
+            )
+        )
+
+
+@pytest.mark.requires_backend_interface(interface=HashBackend)
+class TestX963(object):
+    _algorithms_dict = {
+        'SHA-1': hashes.SHA1,
+        'SHA-224': hashes.SHA224,
+        'SHA-256': hashes.SHA256,
+        'SHA-384': hashes.SHA384,
+        'SHA-512': hashes.SHA512
+    }
+
+    @pytest.mark.parametrize(
+        ("vector"),
+        load_vectors_from_file(
+            os.path.join("KDF", "ansx963_2001.txt"),
+            load_x963_vectors
+        )
+    )
+    def test_x963(self, backend, vector):
+        hashfn = self._algorithms_dict[vector["hash"]]
+        _skip_hashfn_unsupported(backend, hashfn())
+
+        key = binascii.unhexlify(vector["Z"])
+        sharedinfo = None
+        if vector["sharedinfo_length"] != 0:
+            sharedinfo = binascii.unhexlify(vector["sharedinfo"])
+        key_data_len = vector["key_data_length"] // 8
+        key_data = binascii.unhexlify(vector["key_data"])
+
+        xkdf = X963KDF(algorithm=hashfn(),
+                       length=key_data_len,
+                       sharedinfo=sharedinfo,
+                       backend=default_backend())
+        xkdf.verify(key, key_data)
+
+    def test_unsupported_hash(self, backend):
+        _skip_hashfn_unsupported(backend, UnsupportedDummyHash())
diff --git a/tests/hazmat/primitives/test_x963kdf.py b/tests/hazmat/primitives/test_x963kdf.py
new file mode 100644
index 00000000..d87a46b8
--- /dev/null
+++ b/tests/hazmat/primitives/test_x963kdf.py
@@ -0,0 +1,120 @@
+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the BSD License. See the LICENSE file in the root of this repository
+# for complete details.
+
+from __future__ import absolute_import, division, print_function
+
+import binascii
+
+import pytest
+
+from cryptography.exceptions import (
+    AlreadyFinalized, InvalidKey, _Reasons
+)
+from cryptography.hazmat.backends.interfaces import HashBackend
+from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.primitives.kdf.x963kdf import X963KDF
+
+from ...utils import raises_unsupported_algorithm
+
+
+@pytest.mark.requires_backend_interface(interface=HashBackend)
+class TestX963KDF(object):
+    def test_length_limit(self, backend):
+        big_length = hashes.SHA256().digest_size * (2 ** 32 - 1) + 1
+
+        with pytest.raises(ValueError):
+            X963KDF(hashes.SHA256(), big_length, None, backend)
+
+    def test_already_finalized(self, backend):
+        xkdf = X963KDF(hashes.SHA256(), 16, None, backend)
+
+        xkdf.derive(b"\x01" * 16)
+
+        with pytest.raises(AlreadyFinalized):
+            xkdf.derive(b"\x02" * 16)
+
+    def test_derive(self, backend):
+        key = binascii.unhexlify(
+            b"96c05619d56c328ab95fe84b18264b08725b85e33fd34f08"
+        )
+
+        derivedkey = binascii.unhexlify(b"443024c3dae66b95e6f5670601558f71")
+
+        xkdf = X963KDF(hashes.SHA256(), 16, None, backend)
+
+        assert xkdf.derive(key) == derivedkey
+
+    def test_verify(self, backend):
+        key = binascii.unhexlify(
+            b"22518b10e70f2a3f243810ae3254139efbee04aa57c7af7d"
+        )
+
+        sharedinfo = binascii.unhexlify(b"75eef81aa3041e33b80971203d2c0c52")
+
+        derivedkey = binascii.unhexlify(
+            b"c498af77161cc59f2962b9a713e2b215152d139766ce34a776df11866a69bf2e"
+            b"52a13d9c7c6fc878c50c5ea0bc7b00e0da2447cfd874f6cf92f30d0097111485"
+            b"500c90c3af8b487872d04685d14c8d1dc8d7fa08beb0ce0ababc11f0bd496269"
+            b"142d43525a78e5bc79a17f59676a5706dc54d54d4d1f0bd7e386128ec26afc21"
+        )
+
+        xkdf = X963KDF(hashes.SHA256(), 128, sharedinfo, backend)
+
+        assert xkdf.verify(key, derivedkey) is None
+
+    def test_invalid_verify(self, backend):
+        key = binascii.unhexlify(
+            b"96c05619d56c328ab95fe84b18264b08725b85e33fd34f08"
+        )
+
+        xkdf = X963KDF(hashes.SHA256(), 16, None, backend)
+
+        with pytest.raises(InvalidKey):
+            xkdf.verify(key, b"wrong derived key")
+
+    def test_unicode_typeerror(self, backend):
+        with pytest.raises(TypeError):
+            X963KDF(
+                hashes.SHA256(),
+                16,
+                sharedinfo=u"foo",
+                backend=backend
+            )
+
+        with pytest.raises(TypeError):
+            xkdf = X963KDF(
+                hashes.SHA256(),
+                16,
+                sharedinfo=None,
+                backend=backend
+            )
+
+            xkdf.derive(u"foo")
+
+        with pytest.raises(TypeError):
+            xkdf = X963KDF(
+                hashes.SHA256(),
+                16,
+                sharedinfo=None,
+                backend=backend
+            )
+
+            xkdf.verify(u"foo", b"bar")
+
+        with pytest.raises(TypeError):
+            xkdf = X963KDF(
+                hashes.SHA256(),
+                16,
+                sharedinfo=None,
+                backend=backend
+            )
+
+            xkdf.verify(b"foo", u"bar")
+
+
+def test_invalid_backend():
+    pretend_backend = object()
+
+    with raises_unsupported_algorithm(_Reasons.BACKEND_MISSING_INTERFACE):
+        X963KDF(hashes.SHA256(), 16, None, pretend_backend)
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 210e9292..04182a06 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -24,6 +24,7 @@ from .utils import (
     load_hash_vectors, load_kasvs_dh_vectors,
     load_kasvs_ecdh_vectors, load_nist_vectors,
     load_pkcs1_vectors, load_rsa_nist_vectors, load_vectors_from_file,
+    load_x963_vectors,
     raises_unsupported_algorithm, select_backends, skip_if_empty
 )
 
@@ -3410,6 +3411,86 @@ ffdfa60dd7
     assert expected == load_kasvs_ecdh_vectors(vector_data)
 
 
+def test_load_x963_vectors():
+    vector_data = textwrap.dedent("""
+    # CAVS 12.0
+    # 'ANS X9.63-2001' information for sample
+
+    [SHA-1]
+    [shared secret length = 192]
+    [SharedInfo length = 0]
+    [key data length = 128]
+
+    COUNT = 0
+    Z = 1c7d7b5f0597b03d06a018466ed1a93e30ed4b04dc64ccdd
+    SharedInfo =
+        Counter = 00000001
+        Hash input 1 = 1c7d7b5f0597b03d06a018466ed1a93e30ed4b04dc64ccdd00000001
+        K1 = bf71dffd8f4d99223936beb46fee8ccc60439b7e
+    key_data = bf71dffd8f4d99223936beb46fee8ccc
+
+    COUNT = 1
+    Z = 5ed096510e3fcf782ceea98e9737993e2b21370f6cda2ab1
+    SharedInfo =
+        Counter = 00000001
+        Hash input 1 = 5ed096510e3fcf782ceea98e9737993e2b21370f6cda2ab100000001
+        K1 = ec3e224446bfd7b3be1df404104af953c1b2d0f5
+    key_data = ec3e224446bfd7b3be1df404104af953
+
+    [SHA-512]
+    [shared secret length = 521]
+    [SharedInfo length = 128]
+    [key data length = 1024]
+
+    COUNT = 0
+    Z = 00aa5bb79b33e389fa58ceadc047197f14e73712f452caa9fc4c9adb369348b8150739\
+2f1a86ddfdb7c4ff8231c4bd0f44e44a1b55b1404747a9e2e753f55ef05a2d
+    SharedInfo = e3b5b4c1b0d5cf1d2b3a2f9937895d31
+        Counter = 00000001
+        Hash input 1 = 00aa5bb79b33e389fa58ceadc047197f14e73712f452caa9fc4c9ad\
+b369348b81507392f1a86ddfdb7c4ff8231c4bd0f44e44a1b55b1404747a9e2e753f55ef05a2d0\
+0000001e3b5b4c1b0d5cf1d2b3a2f9937895d31
+        K1 = 4463f869f3cc18769b52264b0112b5858f7ad32a5a2d96d8cffabf7fa733633d6\
+e4dd2a599acceb3ea54a6217ce0b50eef4f6b40a5c30250a5a8eeee20800226
+        Counter = 00000002
+        Hash input 2 = 00aa5bb79b33e389fa58ceadc047197f14e73712f452caa9fc4c9ad\
+b369348b81507392f1a86ddfdb7c4ff8231c4bd0f44e44a1b55b1404747a9e2e753f55ef05a2d0\
+0000002e3b5b4c1b0d5cf1d2b3a2f9937895d31
+        K2 = 7089dbf351f3f5022aa9638bf1ee419dea9c4ff745a25ac27bda33ca08bd56dd1\
+a59b4106cf2dbbc0ab2aa8e2efa7b17902d34276951ceccab87f9661c3e8816
+    key_data = 4463f869f3cc18769b52264b0112b5858f7ad32a5a2d96d8cffabf7fa733633\
+d6e4dd2a599acceb3ea54a6217ce0b50eef4f6b40a5c30250a5a8eeee208002267089dbf351f3f\
+5022aa9638bf1ee419dea9c4ff745a25ac27bda33ca08bd56dd1a59b4106cf2dbbc0ab2aa8e2ef\
+a7b17902d34276951ceccab87f9661c3e8816
+    """).splitlines()
+
+    assert load_x963_vectors(vector_data) == [
+        {"hash": "SHA-1", "count": 0,
+         "shared_secret_length": 192,
+         "Z": "1c7d7b5f0597b03d06a018466ed1a93e30ed4b04dc64ccdd",
+         "sharedinfo_length": 0,
+         "key_data_length": 128,
+         "key_data": "bf71dffd8f4d99223936beb46fee8ccc"},
+        {"hash": "SHA-1", "count": 1,
+         "shared_secret_length": 192,
+         "Z": "5ed096510e3fcf782ceea98e9737993e2b21370f6cda2ab1",
+         "sharedinfo_length": 0,
+         "key_data_length": 128,
+         "key_data": "ec3e224446bfd7b3be1df404104af953"},
+        {"hash": "SHA-512", "count": 0,
+         "shared_secret_length": 521,
+         "Z": "00aa5bb79b33e389fa58ceadc047197f14e73712f452caa9fc4c9adb369348b\
+81507392f1a86ddfdb7c4ff8231c4bd0f44e44a1b55b1404747a9e2e753f55ef05a2d",
+         "sharedinfo_length": 128,
+         "sharedinfo": "e3b5b4c1b0d5cf1d2b3a2f9937895d31",
+         "key_data_length": 1024,
+         "key_data": "4463f869f3cc18769b52264b0112b5858f7ad32a5a2d96d8cffabf7f\
+a733633d6e4dd2a599acceb3ea54a6217ce0b50eef4f6b40a5c30250a5a8eeee208002267089db\
+f351f3f5022aa9638bf1ee419dea9c4ff745a25ac27bda33ca08bd56dd1a59b4106cf2dbbc0ab2\
+aa8e2efa7b17902d34276951ceccab87f9661c3e8816"},
+    ]
+
+
 def test_vector_version():
     assert cryptography.__version__ == cryptography_vectors.__version__
 
diff --git a/tests/utils.py b/tests/utils.py
index 7e7abdf1..cc3f9fcc 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -6,6 +6,7 @@ from __future__ import absolute_import, division, print_function
 
 import binascii
 import collections
+import math
 import re
 from contextlib import contextmanager
 
@@ -670,7 +671,7 @@ def load_kasvs_ecdh_vectors(vector_data):
     result_rx = re.compile(r"([FP]) \(([0-9]+) -")
 
     tags = []
-    sets = dict()
+    sets = {}
     vectors = []
 
     # find info in header
@@ -708,8 +709,8 @@ def load_kasvs_ecdh_vectors(vector_data):
 
     # Data
     data = {
-        "CAVS": dict(),
-        "IUT": dict(),
+        "CAVS": {},
+        "IUT": {},
     }
     tag = None
     for line in vector_data:
@@ -755,8 +756,56 @@ def load_kasvs_ecdh_vectors(vector_data):
             vectors.append(data)
 
             data = {
-                "CAVS": dict(),
-                "IUT": dict(),
+                "CAVS": {},
+                "IUT": {},
             }
 
     return vectors
+
+
+def load_x963_vectors(vector_data):
+    """
+    Loads data out of the X9.63 vector data
+    """
+
+    vectors = []
+
+    # Sets Metadata
+    hashname = None
+    vector = {}
+    for line in vector_data:
+        line = line.strip()
+
+        if line.startswith("[SHA"):
+            hashname = line[1:-1]
+            shared_secret_len = 0
+            shared_info_len = 0
+            key_data_len = 0
+        elif line.startswith("[shared secret length"):
+            shared_secret_len = int(line[1:-1].split("=")[1].strip())
+        elif line.startswith("[SharedInfo length"):
+            shared_info_len = int(line[1:-1].split("=")[1].strip())
+        elif line.startswith("[key data length"):
+            key_data_len = int(line[1:-1].split("=")[1].strip())
+        elif line.startswith("COUNT"):
+            count = int(line.split("=")[1].strip())
+            vector["hash"] = hashname
+            vector["count"] = count
+            vector["shared_secret_length"] = shared_secret_len
+            vector["sharedinfo_length"] = shared_info_len
+            vector["key_data_length"] = key_data_len
+        elif line.startswith("Z"):
+            vector["Z"] = line.split("=")[1].strip()
+            assert math.ceil(shared_secret_len / 8) * 2 == len(vector["Z"])
+        elif line.startswith("SharedInfo"):
+            if shared_info_len != 0:
+                vector["sharedinfo"] = line.split("=")[1].strip()
+                silen = len(vector["sharedinfo"])
+                assert math.ceil(shared_info_len / 8) * 2 == silen
+        elif line.startswith("key_data"):
+            vector["key_data"] = line.split("=")[1].strip()
+            assert math.ceil(key_data_len / 8) * 2 == len(vector["key_data"])
+            vectors.append(vector)
+            vector = {}
+
+    return vectors