diff --git a/.travis.yml b/.travis.yml
index b77a7b7..b7fa090 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -87,9 +87,6 @@
           env: TOX_ENV=py3pep8
           compiler: gcc
         - os: osx
-          env: TOX_ENV=docs
-          compiler: clang
-        - os: osx
           env: TOX_ENV=pep8
           compiler: clang
         - os: osx
diff --git a/.travis/install.sh b/.travis/install.sh
index b6dd5ac..7e77fc8 100755
--- a/.travis/install.sh
+++ b/.travis/install.sh
@@ -16,9 +16,14 @@
     fi
 fi
 
-if [[ "${TOX_ENV}" == "docs" && "$(name -s)" != "Darwin" ]]; then
-    sudo apt-get -y update
-    sudo apt-get install libenchant-dev
+if [[ "${TOX_ENV}" == "docs" ]]; then
+    if [[ "$(uname -s)" == "Darwin" ]]; then
+        brew update
+        brew install enchant
+    else
+        sudo apt-get -y update
+        sudo apt-get install libenchant-dev
+    fi
 fi
 
 if [[ "$(uname -s)" == "Darwin" ]]; then
@@ -51,6 +56,11 @@
             pyenv global 3.3.2
             pip install virtualenv
             ;;
+        docs)
+            curl -O https://raw.github.com/pypa/pip/master/contrib/get-pip.py
+            sudo python get-pip.py
+            sudo pip install virtualenv
+            ;;
     esac
     pyenv rehash
 else
diff --git a/cryptography/hazmat/backends/__init__.py b/cryptography/hazmat/backends/__init__.py
index d1b95f2..41d260a 100644
--- a/cryptography/hazmat/backends/__init__.py
+++ b/cryptography/hazmat/backends/__init__.py
@@ -12,6 +12,7 @@
 # limitations under the License.
 
 from cryptography.hazmat.backends import openssl
+from cryptography.hazmat.backends.multibackend import MultiBackend
 from cryptography.hazmat.bindings.commoncrypto.binding import (
     Binding as CommonCryptoBinding
 )
@@ -23,5 +24,8 @@
     _ALL_BACKENDS.append(commoncrypto.backend)
 
 
+_default_backend = MultiBackend(_ALL_BACKENDS)
+
+
 def default_backend():
-    return openssl.backend
+    return _default_backend
diff --git a/cryptography/hazmat/backends/openssl/backend.py b/cryptography/hazmat/backends/openssl/backend.py
index 31ffe0d..f4b5c3a 100644
--- a/cryptography/hazmat/backends/openssl/backend.py
+++ b/cryptography/hazmat/backends/openssl/backend.py
@@ -217,8 +217,11 @@
             )
             assert res == 1
         else:
-            # OpenSSL < 1.0.0
-            assert isinstance(algorithm, hashes.SHA1)
+            if not isinstance(algorithm, hashes.SHA1):
+                raise UnsupportedAlgorithm(
+                    "This version of OpenSSL only supports PBKDF2HMAC with "
+                    "SHA1"
+                )
             res = self._lib.PKCS5_PBKDF2_HMAC_SHA1(
                 key_material,
                 len(key_material),
diff --git a/docs/hazmat/backends/interfaces.rst b/docs/hazmat/backends/interfaces.rst
index 49e4c88..5131ca1 100644
--- a/docs/hazmat/backends/interfaces.rst
+++ b/docs/hazmat/backends/interfaces.rst
@@ -19,6 +19,11 @@
     A backend which provides methods for using ciphers for encryption
     and decryption.
 
+    The following backends implement this interface:
+
+    * :doc:`/hazmat/backends/openssl`
+    * :doc:`/hazmat/backends/commoncrypto`
+
     .. method:: cipher_supported(cipher, mode)
 
         Check if a ``cipher`` and ``mode`` combination is supported by
@@ -76,6 +81,11 @@
 
     A backend with methods for using cryptographic hash functions.
 
+    The following backends implement this interface:
+
+    * :doc:`/hazmat/backends/openssl`
+    * :doc:`/hazmat/backends/commoncrypto`
+
     .. method:: hash_supported(algorithm)
 
         Check if the specified ``algorithm`` is supported by this backend.
@@ -107,6 +117,11 @@
     A backend with methods for using cryptographic hash functions as message
     authentication codes.
 
+    The following backends implement this interface:
+
+    * :doc:`/hazmat/backends/openssl`
+    * :doc:`/hazmat/backends/commoncrypto`
+
     .. method:: hmac_supported(algorithm)
 
         Check if the specified ``algorithm`` is supported by this backend.
@@ -139,6 +154,11 @@
 
     A backend with methods for using PBKDF2 using HMAC as a PRF.
 
+    The following backends implement this interface:
+
+    * :doc:`/hazmat/backends/openssl`
+    * :doc:`/hazmat/backends/commoncrypto`
+
     .. method:: pbkdf2_hmac_supported(algorithm)
 
         Check if the specified ``algorithm`` is supported by this backend.
@@ -171,4 +191,3 @@
             the derived key. This is typically a password.
 
         :return bytes: Derived key.
-
diff --git a/docs/hazmat/backends/multibackend.rst b/docs/hazmat/backends/multibackend.rst
index 63177be..95538ac 100644
--- a/docs/hazmat/backends/multibackend.rst
+++ b/docs/hazmat/backends/multibackend.rst
@@ -18,10 +18,10 @@
         >>> from cryptography.hazmat.primitives import hashes
         >>> backend1.hash_supported(hashes.SHA256())
         False
-        >>> backend2.hash_supported(hashes.SHA1())
+        >>> backend2.hash_supported(hashes.SHA256())
         True
         >>> multi_backend = MultiBackend([backend1, backend2])
-        >>> multi_backend.hash_supported(hashes.SHA1())
+        >>> multi_backend.hash_supported(hashes.SHA256())
         True
 
     :param backends: A ``list`` of backend objects. Backends are checked for
diff --git a/docs/hazmat/bindings/commoncrypto.rst b/docs/hazmat/bindings/commoncrypto.rst
index c4f614c..50dbe69 100644
--- a/docs/hazmat/bindings/commoncrypto.rst
+++ b/docs/hazmat/bindings/commoncrypto.rst
@@ -27,4 +27,4 @@
 
 
 .. _`CFFI`: https://cffi.readthedocs.org/
-.. _`CommonCrypto`: https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man3/Common%20Crypto.3cc.html#//apple_ref/doc/man/3cc/CommonCrypto
+.. _`CommonCrypto`: https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man3/Common%20Crypto.3cc.html
diff --git a/docs/hazmat/primitives/constant-time.rst b/docs/hazmat/primitives/constant-time.rst
index 632e7c6..c6fcb3a 100644
--- a/docs/hazmat/primitives/constant-time.rst
+++ b/docs/hazmat/primitives/constant-time.rst
@@ -19,8 +19,10 @@
 
 .. function:: bytes_eq(a, b)
 
-    Compare ``a`` and ``b`` to one another in constant time if they are of the
-    same length.
+    Compares ``a`` and ``b`` with one another. If ``a`` and ``b`` have
+    different lengths, this returns ``False`` immediately. Otherwise it
+    compares them in a way that takes the same amount of time, regardless of
+    how many characters are the same between the two.
 
     .. doctest::
 
@@ -30,9 +32,10 @@
         >>> constant_time.bytes_eq(b"foo", b"bar")
         False
 
-    :param a bytes: The left-hand side.
-    :param b bytes: The right-hand side.
-    :returns boolean: True if ``a`` has the same bytes as ``b``.
+    :param bytes a: The left-hand side.
+    :param bytes b: The right-hand side.
+    :returns bool: ``True`` if ``a`` has the same bytes as ``b``, otherwise
+                   ``False``.
 
 
 .. _`Coda Hale's blog post`: http://codahale.com/a-lesson-in-timing-attacks/
diff --git a/tests/hazmat/backends/test_openssl.py b/tests/hazmat/backends/test_openssl.py
index ef7560f..1fd513d 100644
--- a/tests/hazmat/backends/test_openssl.py
+++ b/tests/hazmat/backends/test_openssl.py
@@ -20,7 +20,7 @@
 from cryptography import utils
 from cryptography.exceptions import UnsupportedAlgorithm, InternalError
 from cryptography.hazmat.backends.openssl.backend import backend, Backend
-from cryptography.hazmat.primitives import interfaces
+from cryptography.hazmat.primitives import interfaces, hashes
 from cryptography.hazmat.primitives.ciphers import Cipher
 from cryptography.hazmat.primitives.ciphers.algorithms import AES
 from cryptography.hazmat.primitives.ciphers.modes import CBC
@@ -246,6 +246,12 @@
             b"data not multiple of block length"
         )
 
+    def test_derive_pbkdf2_raises_unsupported_on_old_openssl(self):
+        if backend.pbkdf2_hmac_supported(hashes.SHA256()):
+            pytest.skip("Requires an older OpenSSL")
+        with pytest.raises(UnsupportedAlgorithm):
+            backend.derive_pbkdf2_hmac(hashes.SHA256(), 10, b"", 1000, b"")
+
     # This test is not in the next class because to check if it's really
     # default we don't want to run the setup_method before it
     def test_osrandom_engine_is_default(self):
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 8ecb33f..2f4a43c 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -21,7 +21,7 @@
 from .utils import (
     load_nist_vectors, load_vectors_from_file, load_cryptrec_vectors,
     load_openssl_vectors, load_hash_vectors, check_for_iface,
-    check_backend_support, select_backends
+    check_backend_support, select_backends, load_pkcs1_vectors
 )
 
 
@@ -529,3 +529,300 @@
          'ct': b'15c4db4cbb451211179d57017f',
          'fail': True},
     ]
+
+
+def test_load_pkcs1_vectors():
+    vector_data = textwrap.dedent("""
+    Test vectors for RSA-PSS
+    ========================
+
+    This file contains an extract of the original pss-vect.txt
+
+    Key lengths:
+
+    Key  8: 1031 bits
+    Key  9: 1536 bits
+    ===========================================================================
+
+    <snip>
+
+    # Example 8: A 1031-bit RSA key pair
+    # -----------------------------------
+
+
+    # Public key
+    # ----------
+
+    # Modulus:
+    49 53 70 a1 fb 18 54 3c 16 d3 63 1e 31 63 25 5d
+    f6 2b e6 ee e8 90 d5 f2 55 09 e4 f7 78 a8 ea 6f
+    bb bc df 85 df f6 4e 0d 97 20 03 ab 36 81 fb ba
+    6d d4 1f d5 41 82 9b 2e 58 2d e9 f2 a4 a4 e0 a2
+    d0 90 0b ef 47 53 db 3c ee 0e e0 6c 7d fa e8 b1
+    d5 3b 59 53 21 8f 9c ce ea 69 5b 08 66 8e de aa
+    dc ed 94 63 b1 d7 90 d5 eb f2 7e 91 15 b4 6c ad
+    4d 9a 2b 8e fa b0 56 1b 08 10 34 47 39 ad a0 73
+    3f
+
+    # Exponent:
+    01 00 01
+
+    # Private key
+    # -----------
+
+    # Modulus:
+    49 53 70 a1 fb 18 54 3c 16 d3 63 1e 31 63 25 5d
+    f6 2b e6 ee e8 90 d5 f2 55 09 e4 f7 78 a8 ea 6f
+    bb bc df 85 df f6 4e 0d 97 20 03 ab 36 81 fb ba
+    6d d4 1f d5 41 82 9b 2e 58 2d e9 f2 a4 a4 e0 a2
+    d0 90 0b ef 47 53 db 3c ee 0e e0 6c 7d fa e8 b1
+    d5 3b 59 53 21 8f 9c ce ea 69 5b 08 66 8e de aa
+    dc ed 94 63 b1 d7 90 d5 eb f2 7e 91 15 b4 6c ad
+    4d 9a 2b 8e fa b0 56 1b 08 10 34 47 39 ad a0 73
+    3f
+
+    # Public exponent:
+    01 00 01
+
+    # Exponent:
+    6c 66 ff e9 89 80 c3 8f cd ea b5 15 98 98 83 61
+    65 f4 b4 b8 17 c4 f6 a8 d4 86 ee 4e a9 13 0f e9
+    b9 09 2b d1 36 d1 84 f9 5f 50 4a 60 7e ac 56 58
+    46 d2 fd d6 59 7a 89 67 c7 39 6e f9 5a 6e ee bb
+    45 78 a6 43 96 6d ca 4d 8e e3 de 84 2d e6 32 79
+    c6 18 15 9c 1a b5 4a 89 43 7b 6a 61 20 e4 93 0a
+    fb 52 a4 ba 6c ed 8a 49 47 ac 64 b3 0a 34 97 cb
+    e7 01 c2 d6 26 6d 51 72 19 ad 0e c6 d3 47 db e9
+
+    # Prime 1:
+    08 da d7 f1 13 63 fa a6 23 d5 d6 d5 e8 a3 19 32
+    8d 82 19 0d 71 27 d2 84 6c 43 9b 0a b7 26 19 b0
+    a4 3a 95 32 0e 4e c3 4f c3 a9 ce a8 76 42 23 05
+    bd 76 c5 ba 7b e9 e2 f4 10 c8 06 06 45 a1 d2 9e
+    db
+
+    # Prime 2:
+    08 47 e7 32 37 6f c7 90 0f 89 8e a8 2e b2 b0 fc
+    41 85 65 fd ae 62 f7 d9 ec 4c e2 21 7b 97 99 0d
+    d2 72 db 15 7f 99 f6 3c 0d cb b9 fb ac db d4 c4
+    da db 6d f6 77 56 35 8c a4 17 48 25 b4 8f 49 70
+    6d
+
+    # Prime exponent 1:
+    05 c2 a8 3c 12 4b 36 21 a2 aa 57 ea 2c 3e fe 03
+    5e ff 45 60 f3 3d de bb 7a da b8 1f ce 69 a0 c8
+    c2 ed c1 65 20 dd a8 3d 59 a2 3b e8 67 96 3a c6
+    5f 2c c7 10 bb cf b9 6e e1 03 de b7 71 d1 05 fd
+    85
+
+    # Prime exponent 2:
+    04 ca e8 aa 0d 9f aa 16 5c 87 b6 82 ec 14 0b 8e
+    d3 b5 0b 24 59 4b 7a 3b 2c 22 0b 36 69 bb 81 9f
+    98 4f 55 31 0a 1a e7 82 36 51 d4 a0 2e 99 44 79
+    72 59 51 39 36 34 34 e5 e3 0a 7e 7d 24 15 51 e1
+    b9
+
+    # Coefficient:
+    07 d3 e4 7b f6 86 60 0b 11 ac 28 3c e8 8d bb 3f
+    60 51 e8 ef d0 46 80 e4 4c 17 1e f5 31 b8 0b 2b
+    7c 39 fc 76 63 20 e2 cf 15 d8 d9 98 20 e9 6f f3
+    0d c6 96 91 83 9c 4b 40 d7 b0 6e 45 30 7d c9 1f
+    3f
+
+    # RSA-PSS signing of 6 random messages with random salts
+    # -------------------------------------------------------
+
+    <snip>
+
+    # =============================================
+
+    # Example 9: A 1536-bit RSA key pair
+    # -----------------------------------
+
+
+    # Public key
+    # ----------
+
+    # Modulus:
+    e6 bd 69 2a c9 66 45 79 04 03 fd d0 f5 be b8 b9
+    bf 92 ed 10 00 7f c3 65 04 64 19 dd 06 c0 5c 5b
+    5b 2f 48 ec f9 89 e4 ce 26 91 09 97 9c bb 40 b4
+    a0 ad 24 d2 24 83 d1 ee 31 5a d4 cc b1 53 42 68
+    35 26 91 c5 24 f6 dd 8e 6c 29 d2 24 cf 24 69 73
+    ae c8 6c 5b f6 b1 40 1a 85 0d 1b 9a d1 bb 8c bc
+    ec 47 b0 6f 0f 8c 7f 45 d3 fc 8f 31 92 99 c5 43
+    3d db c2 b3 05 3b 47 de d2 ec d4 a4 ca ef d6 14
+    83 3d c8 bb 62 2f 31 7e d0 76 b8 05 7f e8 de 3f
+    84 48 0a d5 e8 3e 4a 61 90 4a 4f 24 8f b3 97 02
+    73 57 e1 d3 0e 46 31 39 81 5c 6f d4 fd 5a c5 b8
+    17 2a 45 23 0e cb 63 18 a0 4f 14 55 d8 4e 5a 8b
+
+    # Exponent:
+    01 00 01
+
+    # Private key
+    # -----------
+
+    # Modulus:
+    e6 bd 69 2a c9 66 45 79 04 03 fd d0 f5 be b8 b9
+    bf 92 ed 10 00 7f c3 65 04 64 19 dd 06 c0 5c 5b
+    5b 2f 48 ec f9 89 e4 ce 26 91 09 97 9c bb 40 b4
+    a0 ad 24 d2 24 83 d1 ee 31 5a d4 cc b1 53 42 68
+    35 26 91 c5 24 f6 dd 8e 6c 29 d2 24 cf 24 69 73
+    ae c8 6c 5b f6 b1 40 1a 85 0d 1b 9a d1 bb 8c bc
+    ec 47 b0 6f 0f 8c 7f 45 d3 fc 8f 31 92 99 c5 43
+    3d db c2 b3 05 3b 47 de d2 ec d4 a4 ca ef d6 14
+    83 3d c8 bb 62 2f 31 7e d0 76 b8 05 7f e8 de 3f
+    84 48 0a d5 e8 3e 4a 61 90 4a 4f 24 8f b3 97 02
+    73 57 e1 d3 0e 46 31 39 81 5c 6f d4 fd 5a c5 b8
+    17 2a 45 23 0e cb 63 18 a0 4f 14 55 d8 4e 5a 8b
+
+    # Public exponent:
+    01 00 01
+
+    # Exponent:
+    6a 7f d8 4f b8 5f ad 07 3b 34 40 6d b7 4f 8d 61
+    a6 ab c1 21 96 a9 61 dd 79 56 5e 9d a6 e5 18 7b
+    ce 2d 98 02 50 f7 35 95 75 35 92 70 d9 15 90 bb
+    0e 42 7c 71 46 0b 55 d5 14 10 b1 91 bc f3 09 fe
+    a1 31 a9 2c 8e 70 27 38 fa 71 9f 1e 00 41 f5 2e
+    40 e9 1f 22 9f 4d 96 a1 e6 f1 72 e1 55 96 b4 51
+    0a 6d ae c2 61 05 f2 be bc 53 31 6b 87 bd f2 13
+    11 66 60 70 e8 df ee 69 d5 2c 71 a9 76 ca ae 79
+    c7 2b 68 d2 85 80 dc 68 6d 9f 51 29 d2 25 f8 2b
+    3d 61 55 13 a8 82 b3 db 91 41 6b 48 ce 08 88 82
+    13 e3 7e eb 9a f8 00 d8 1c ab 32 8c e4 20 68 99
+    03 c0 0c 7b 5f d3 1b 75 50 3a 6d 41 96 84 d6 29
+
+    # Prime 1:
+    f8 eb 97 e9 8d f1 26 64 ee fd b7 61 59 6a 69 dd
+    cd 0e 76 da ec e6 ed 4b f5 a1 b5 0a c0 86 f7 92
+    8a 4d 2f 87 26 a7 7e 51 5b 74 da 41 98 8f 22 0b
+    1c c8 7a a1 fc 81 0c e9 9a 82 f2 d1 ce 82 1e dc
+    ed 79 4c 69 41 f4 2c 7a 1a 0b 8c 4d 28 c7 5e c6
+    0b 65 22 79 f6 15 4a 76 2a ed 16 5d 47 de e3 67
+
+    # Prime 2:
+    ed 4d 71 d0 a6 e2 4b 93 c2 e5 f6 b4 bb e0 5f 5f
+    b0 af a0 42 d2 04 fe 33 78 d3 65 c2 f2 88 b6 a8
+    da d7 ef e4 5d 15 3e ef 40 ca cc 7b 81 ff 93 40
+    02 d1 08 99 4b 94 a5 e4 72 8c d9 c9 63 37 5a e4
+    99 65 bd a5 5c bf 0e fe d8 d6 55 3b 40 27 f2 d8
+    62 08 a6 e6 b4 89 c1 76 12 80 92 d6 29 e4 9d 3d
+
+    # Prime exponent 1:
+    2b b6 8b dd fb 0c 4f 56 c8 55 8b ff af 89 2d 80
+    43 03 78 41 e7 fa 81 cf a6 1a 38 c5 e3 9b 90 1c
+    8e e7 11 22 a5 da 22 27 bd 6c de eb 48 14 52 c1
+    2a d3 d6 1d 5e 4f 77 6a 0a b5 56 59 1b ef e3 e5
+    9e 5a 7f dd b8 34 5e 1f 2f 35 b9 f4 ce e5 7c 32
+    41 4c 08 6a ec 99 3e 93 53 e4 80 d9 ee c6 28 9f
+
+    # Prime exponent 2:
+    4f f8 97 70 9f ad 07 97 46 49 45 78 e7 0f d8 54
+    61 30 ee ab 56 27 c4 9b 08 0f 05 ee 4a d9 f3 e4
+    b7 cb a9 d6 a5 df f1 13 a4 1c 34 09 33 68 33 f1
+    90 81 6d 8a 6b c4 2e 9b ec 56 b7 56 7d 0f 3c 9c
+    69 6d b6 19 b2 45 d9 01 dd 85 6d b7 c8 09 2e 77
+    e9 a1 cc cd 56 ee 4d ba 42 c5 fd b6 1a ec 26 69
+
+    # Coefficient:
+    77 b9 d1 13 7b 50 40 4a 98 27 29 31 6e fa fc 7d
+    fe 66 d3 4e 5a 18 26 00 d5 f3 0a 0a 85 12 05 1c
+    56 0d 08 1d 4d 0a 18 35 ec 3d 25 a6 0f 4e 4d 6a
+    a9 48 b2 bf 3d bb 5b 12 4c bb c3 48 92 55 a3 a9
+    48 37 2f 69 78 49 67 45 f9 43 e1 db 4f 18 38 2c
+    ea a5 05 df c6 57 57 bb 3f 85 7a 58 dc e5 21 56
+
+    # RSA-PSS signing of 6 random messages with random salts
+    # -------------------------------------------------------
+
+    <snip>
+
+    # =============================================
+
+    <snip>
+    """).splitlines()
+
+    vectors = tuple(load_pkcs1_vectors(vector_data))
+    expected = (
+        (
+            {
+                'modulus': int(
+                    '495370a1fb18543c16d3631e3163255df62be6eee890d5f25509e4f77'
+                    '8a8ea6fbbbcdf85dff64e0d972003ab3681fbba6dd41fd541829b2e58'
+                    '2de9f2a4a4e0a2d0900bef4753db3cee0ee06c7dfae8b1d53b5953218'
+                    'f9cceea695b08668edeaadced9463b1d790d5ebf27e9115b46cad4d9a'
+                    '2b8efab0561b0810344739ada0733f', 16),
+                'public_exponent': int('10001', 16),
+                'private_exponent': int(
+                    '6c66ffe98980c38fcdeab5159898836165f4b4b817c4f6a8d486ee4ea'
+                    '9130fe9b9092bd136d184f95f504a607eac565846d2fdd6597a8967c7'
+                    '396ef95a6eeebb4578a643966dca4d8ee3de842de63279c618159c1ab'
+                    '54a89437b6a6120e4930afb52a4ba6ced8a4947ac64b30a3497cbe701'
+                    'c2d6266d517219ad0ec6d347dbe9', 16),
+                'p': int(
+                    '8dad7f11363faa623d5d6d5e8a319328d82190d7127d2846c439b0ab7'
+                    '2619b0a43a95320e4ec34fc3a9cea876422305bd76c5ba7be9e2f410c'
+                    '8060645a1d29edb', 16),
+                'q': int(
+                    '847e732376fc7900f898ea82eb2b0fc418565fdae62f7d9ec4ce2217b'
+                    '97990dd272db157f99f63c0dcbb9fbacdbd4c4dadb6df67756358ca41'
+                    '74825b48f49706d', 16)
+            },
+
+            {
+                'modulus': int(
+                    '495370a1fb18543c16d3631e3163255df62be6eee890d5f25509e4f77'
+                    '8a8ea6fbbbcdf85dff64e0d972003ab3681fbba6dd41fd541829b2e58'
+                    '2de9f2a4a4e0a2d0900bef4753db3cee0ee06c7dfae8b1d53b5953218'
+                    'f9cceea695b08668edeaadced9463b1d790d5ebf27e9115b46cad4d9a'
+                    '2b8efab0561b0810344739ada0733f', 16),
+                'public_exponent': int('10001', 16)
+            }
+        ),
+        (
+            {
+                'modulus': int(
+                    'e6bd692ac96645790403fdd0f5beb8b9bf92ed10007fc365046419dd0'
+                    '6c05c5b5b2f48ecf989e4ce269109979cbb40b4a0ad24d22483d1ee31'
+                    '5ad4ccb1534268352691c524f6dd8e6c29d224cf246973aec86c5bf6b'
+                    '1401a850d1b9ad1bb8cbcec47b06f0f8c7f45d3fc8f319299c5433ddb'
+                    'c2b3053b47ded2ecd4a4caefd614833dc8bb622f317ed076b8057fe8d'
+                    'e3f84480ad5e83e4a61904a4f248fb397027357e1d30e463139815c6f'
+                    'd4fd5ac5b8172a45230ecb6318a04f1455d84e5a8b', 16),
+                'public_exponent': int('10001', 16),
+                'private_exponent': int(
+                    '6a7fd84fb85fad073b34406db74f8d61a6abc12196a961dd79565e9da'
+                    '6e5187bce2d980250f7359575359270d91590bb0e427c71460b55d514'
+                    '10b191bcf309fea131a92c8e702738fa719f1e0041f52e40e91f229f4'
+                    'd96a1e6f172e15596b4510a6daec26105f2bebc53316b87bdf2131166'
+                    '6070e8dfee69d52c71a976caae79c72b68d28580dc686d9f5129d225f'
+                    '82b3d615513a882b3db91416b48ce08888213e37eeb9af800d81cab32'
+                    '8ce420689903c00c7b5fd31b75503a6d419684d629', 16),
+                'p': int(
+                    'f8eb97e98df12664eefdb761596a69ddcd0e76daece6ed4bf5a1b50ac'
+                    '086f7928a4d2f8726a77e515b74da41988f220b1cc87aa1fc810ce99a'
+                    '82f2d1ce821edced794c6941f42c7a1a0b8c4d28c75ec60b652279f61'
+                    '54a762aed165d47dee367', 16),
+                'q': int(
+                    'ed4d71d0a6e24b93c2e5f6b4bbe05f5fb0afa042d204fe3378d365c2f'
+                    '288b6a8dad7efe45d153eef40cacc7b81ff934002d108994b94a5e472'
+                    '8cd9c963375ae49965bda55cbf0efed8d6553b4027f2d86208a6e6b48'
+                    '9c176128092d629e49d3d', 16)
+            },
+
+            {
+                'modulus': int(
+                    'e6bd692ac96645790403fdd0f5beb8b9bf92ed10007fc365046419dd0'
+                    '6c05c5b5b2f48ecf989e4ce269109979cbb40b4a0ad24d22483d1ee31'
+                    '5ad4ccb1534268352691c524f6dd8e6c29d224cf246973aec86c5bf6b'
+                    '1401a850d1b9ad1bb8cbcec47b06f0f8c7f45d3fc8f319299c5433ddb'
+                    'c2b3053b47ded2ecd4a4caefd614833dc8bb622f317ed076b8057fe8d'
+                    'e3f84480ad5e83e4a61904a4f248fb397027357e1d30e463139815c6f'
+                    'd4fd5ac5b8172a45230ecb6318a04f1455d84e5a8b', 16),
+                'public_exponent': int('10001', 16)
+            }
+        )
+    )
+    assert vectors == expected
diff --git a/tests/utils.py b/tests/utils.py
index 5c0e524..408b05f 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -14,6 +14,7 @@
 import collections
 import os
 
+import six
 import pytest
 
 
@@ -191,3 +192,79 @@
         else:
             raise ValueError("Unknown line in hash vector")
     return vectors
+
+
+def load_pkcs1_vectors(vector_data):
+    """
+    Loads data out of RSA PKCS #1 vector files.
+
+    Currently only returns the key pairs.
+    """
+    private_key_vector = None
+    public_key_vector = None
+    attr = None
+    key = None
+    vectors = []
+    for line in vector_data:
+        if (
+            line.startswith("# Example") or
+            line.startswith("# =============================================")
+        ):
+            if key:
+                assert private_key_vector
+                assert public_key_vector
+
+                for key, value in six.iteritems(public_key_vector):
+                    hex_str = "".join(value).replace(" ", "")
+                    public_key_vector[key] = int(hex_str, 16)
+
+                for key, value in six.iteritems(private_key_vector):
+                    hex_str = "".join(value).replace(" ", "")
+                    private_key_vector[key] = int(hex_str, 16)
+
+                assert (
+                    private_key_vector['public_exponent'] ==
+                    public_key_vector['public_exponent']
+                )
+
+                assert (
+                    private_key_vector['modulus'] ==
+                    public_key_vector['modulus']
+                )
+
+                vectors.append(
+                    (private_key_vector, public_key_vector)
+                )
+
+            public_key_vector = collections.defaultdict(list)
+            private_key_vector = collections.defaultdict(list)
+            key = None
+            attr = None
+
+        if private_key_vector is None or public_key_vector is None:
+            continue
+
+        if line.startswith("# Private key"):
+            key = private_key_vector
+        elif line.startswith("# Public key"):
+            key = public_key_vector
+        elif line.startswith("# Modulus:"):
+            attr = "modulus"
+        elif line.startswith("# Public exponent:"):
+            attr = "public_exponent"
+        elif line.startswith("# Exponent:"):
+            if key is public_key_vector:
+                attr = "public_exponent"
+            else:
+                assert key is private_key_vector
+                attr = "private_exponent"
+        elif line.startswith("# Prime 1:"):
+            attr = "p"
+        elif line.startswith("# Prime 2:"):
+            attr = "q"
+        elif line.startswith("#"):
+            attr = None
+        else:
+            if key is not None and attr is not None:
+                key[attr].append(line.strip())
+    return vectors