<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><span style="font-family: Arial, sans-serif; font-size: 10pt;">Hello,</span></div><div class="WordSection1"><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">I imagine this may have a trivial explanation, or perhaps indicate some quirk on my machine, but it looks as though some desired functionality isn’t available on my machine with version 1.4. I wanted to share this in case it indicates some wider issue of interest, and helps me learn a little about how </span><span style="font-size:10.0pt;font-family:"Courier New"">cryptography</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> works under the hood.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Windows 7, 64-bit, Python 3.5.1, and I believe OpenSSL 1.0.2. I use </span><span style="font-size:10.0pt;font-family:"Courier New"">paramiko</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> for SFTP, and when updating paramiko (on a whim) to 2.0.2 with Anaconda, it had me update </span><span style="font-size:10.0pt;font-family:"Courier New"">cryptography</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> as well, to version 1.4, or maybe it was 1.3 at first — either one experiences the issue. When attempting an SSH connect, I get a traceback ending with this:<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-family:"Courier New"">File "C:\Users\...\AppData\Local\Continuum\Anaconda3\lib\site-packages\cryptography\hazmat\bindings\openssl\binding.py", line 73, in wrapper<o:p></o:p></span></p><p class="MsoNormal"><span style="font-family:"Courier New""> if lib.Cryptography_STATIC_CALLBACKS:<o:p></o:p></span></p><p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-family:"Courier New"">AttributeError: cffi library '_openssl' has no function, constant or global variable named 'Cryptography_STATIC_CALLBACKS'<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">When I manually carry out some of the imports in the source...<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">from cryptography.hazmat.bindings._openssl import ffi, lib<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">...and then look at what auto-complete shows for </span><span style="font-size:10.0pt;font-family:"Courier New"">lib</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">, I don’t see </span><span style="font-size:10.0pt;font-family:"Courier New"">Cryptography_STATIC_CALLBACKS</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">, which is consistent with the AttributeError. I don’t yet understand where to look for the source underneath the bootstrapped </span><span style="font-size:10.0pt;font-family:"Courier New"">_openssl.*.pyd</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> file.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">The SSH connection and all subsequent functionality work fine with the latest versions of </span><span style="font-size:10.0pt;font-family:"Courier New"">paramiko</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> and </span><span style="font-size:10.0pt;font-family:"Courier New"">cffi</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> as long as I revert </span><span style="font-size:10.0pt;font-family:"Courier New"">cryptography</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> to 1.0.2.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">-Robin Fishbein<o:p></o:p></span></p><p class="MsoNormal"><br></p></div><style><!--
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