Drop 1.0.0 (#3312)

* delete the 1.0.0 support

* drop the version check

* drop the AES-CTR stuff

* Update the example

* openssl truncates for us now

* delete unused test

* unused imports

* Remove a bunch of conditional bindings for NPN

* no more 1.0.0 builders

* libressl fix

* update the docs

* remove dead branches

* oops

* this is a word, damnit

* spelling

* try removing this

* this test is not needed

* unused import

5 files changed, 12 insertions, 30 deletions

diff --git a/docs/development/c-bindings.rst b/docs/development/c-bindings.rst
index cbd8fab0..d76154d5 100644
--- a/docs/development/c-bindings.rst
+++ b/docs/development/c-bindings.rst
@@ -183,9 +183,9 @@ Caveats
 Sometimes, a set of loosely related features are added in the same
 version, and it's impractical to create ``#ifdef`` statements for each
 one. In that case, it may make sense to either check for a particular
-version. For example, to check for OpenSSL 1.0.0 or newer::
+version. For example, to check for OpenSSL 1.1.0 or newer::
 
-    #if OPENSSL_VERSION_NUMBER >= 0x10000000L
+    #if OPENSSL_VERSION_NUMBER >= 0x10100000L
 
 Sometimes, the version of a library on a particular platform will have
 features that you thought it wouldn't, based on its version.
diff --git a/docs/faq.rst b/docs/faq.rst
index 76117a91..bbcf302e 100644
--- a/docs/faq.rst
+++ b/docs/faq.rst
@@ -40,27 +40,14 @@ If you have no other libraries using OpenSSL in your process, or they do not
 appear to be at fault, it's possible that this is a bug in ``cryptography``.
 Please file an `issue`_ with instructions on how to reproduce it.
 
-Importing cryptography causes a ``RuntimeError`` about OpenSSL 1.0.0
---------------------------------------------------------------------
-
-The OpenSSL project has dropped support for the 1.0.0 release series. Since it
-is no longer receiving security patches from upstream, ``cryptography`` is also
-dropping support for it. To fix this issue you should upgrade to a newer
-version of OpenSSL (1.0.1 or later). This may require you to upgrade to a newer
-operating system.
-
-For the 1.7 release, you can set the ``CRYPTOGRAPHY_ALLOW_OPENSSL_100``
-environment variable. Please note that this is *temporary* and will be removed
-in ``cryptography`` 1.8.
-
-Installing cryptography with OpenSSL 0.9.8 fails
-------------------------------------------------
-
-The OpenSSL project has dropped support for the 0.9.8 release series. Since it
-is no longer receiving security patches from upstream, ``cryptography`` is also
-dropping support for it. To fix this issue you should upgrade to a newer
-version of OpenSSL (1.0.1 or later). This may require you to upgrade to a newer
-operating system.
+Installing cryptography with OpenSSL 0.9.8 or 1.0.0 fails
+---------------------------------------------------------
+
+The OpenSSL project has dropped support for the 0.9.8 and 1.0.0 release series.
+Since they are no longer receiving security patches from upstream,
+``cryptography`` is also dropping support for them. To fix this issue you
+should upgrade to a newer version of OpenSSL (1.0.1 or later). This may require
+you to upgrade to a newer operating system.
 
 .. _`NaCl`: https://nacl.cr.yp.to/
 .. _`PyNaCl`: https://pynacl.readthedocs.io
diff --git a/docs/hazmat/backends/openssl.rst b/docs/hazmat/backends/openssl.rst
index f97ec571..e293c064 100644
--- a/docs/hazmat/backends/openssl.rst
+++ b/docs/hazmat/backends/openssl.rst
@@ -3,7 +3,7 @@
 OpenSSL backend
 ===============
 
-The `OpenSSL`_ C library. Cryptography supports OpenSSL version ``1.0.0`` and
+The `OpenSSL`_ C library. Cryptography supports OpenSSL version 1.0.1 and
 greater.
 
 .. data:: cryptography.hazmat.backends.openssl.backend
diff --git a/docs/hazmat/bindings/openssl.rst b/docs/hazmat/bindings/openssl.rst
index 482cfaf8..ac65aa97 100644
--- a/docs/hazmat/bindings/openssl.rst
+++ b/docs/hazmat/bindings/openssl.rst
@@ -6,7 +6,7 @@ OpenSSL binding
 .. currentmodule:: cryptography.hazmat.bindings.openssl.binding
 
 These are `CFFI`_ bindings to the `OpenSSL`_ C library. Cryptography supports
-OpenSSL version ``1.0.0`` and greater.
+OpenSSL version 1.0.1 and greater.
 
 .. class:: cryptography.hazmat.bindings.openssl.binding.Binding()
 
diff --git a/docs/installation.rst b/docs/installation.rst
index 9ad9a3cc..31116ff7 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -28,7 +28,6 @@ Currently we test ``cryptography`` on Python 2.6, 2.7, 3.3, 3.4, 3.5, and PyPy
 We test compiling with ``clang`` as well as ``gcc`` and use the following
 OpenSSL releases:
 
-* ``OpenSSL 1.0.0-fips`` (``RHEL/CentOS 6.4``)
 * ``OpenSSL 1.0.1``
 * ``OpenSSL 1.0.1e-fips`` (``RHEL/CentOS 7``)
 * ``OpenSSL 1.0.1j-freebsd``
@@ -36,10 +35,6 @@ OpenSSL releases:
 * ``OpenSSL 1.0.2-latest``
 * ``OpenSSL 1.1.0``
 
-.. warning::
-    Cryptography 1.7 has dropped support for OpenSSL 1.0.0, see the
-    :doc:`FAQ </faq>` for more details
-
 Building cryptography on Windows
 --------------------------------