Python Cryptography Breaks Up with OpenSSL with Paul Kehrer and Alex Gaynor

Web Reference: 96 What does the “at” (@) symbol do in Python? @ symbol is a syntactic sugar python provides to utilize decorator, to paraphrase the question, It's exactly about what does decorator do in Python? Put it simple decorator allow you to modify a given function's definition without touch its innermost (it's closure). In Python this is simply =. To translate this pseudocode into Python you would need to know the data structures being referenced, and a bit more of the algorithm implementation. Some notes about psuedocode: := is the assignment operator or = in Python = is the equality operator or == in Python There are certain styles, and your mileage may vary: Python slicing is a computationally fast way to methodically access parts of your data. In my opinion, to be even an intermediate Python programmer, it's one aspect of the language that it is necessary to be familiar with.

YouTube Excerpt: The Python cryptography module, pyca/cryptography, has mostly been a sane wrapper around a pile of C, so that users get performant cryptography on the many, many platforms Python targets. Therefore its maintainers, Alex Gaynor and Paul Kehrer, have become intimately familiar with OpenSSL. Recently, they declared that after many years of trying to make it work, they announced pyca/cryptography would be moving away from OpenSSL when supporting new functionality and exploring adding other backends instead. We invited them on to tell us about what has happened to OpenSSL, even after the investments and improvements following Heartbleed. No guests on this pod represent anyone besides themselves. Transcript: https://securitycryptographywhatever.com/2026/02/01/python-cryptography-breaks-up-with-openssl Links: - https://cryptography.io/en/latest/statements/state-of-openssl/ - Py Cryptography: https://cryptography.io - https://archive.openssl-conference.org/2025/presentations/Alex_Gaynor_Paul_Kehrer_The_Python_Cryptographic_Authoritys_OpenSSL_Experience.pdf - https://securitycryptographywhatever.com/2025/08/16/alex-gaynor/ - https://packages.gentoo.org/packages/media-libs/libsdl - https://www.youtube.com/watch?v=RUIguklWwx0 - https://datatracker.ietf.org/doc/rfc9180/ - https://docs.openssl.org/3.3/man3/OSSL_PARAM/ - https://openssl.foundation/ - https://github.com/openssl/openssl/issues/17064 - https://www.feistyduck.com/newsletter/issue_132_openssl_performance_still_under_scrutiny - https://github.com/topazproject/topaz - https://github.com/actions/runner/issues/1069 - https://crystalhotsauce.com/ - https://openssl-library.org/news/vulnerabilities/#CVE-2025-15467 - https://en.wikipedia.org/wiki/Ship_of_Theseus - https://boringssl.googlesource.com/boringssl/+/aa202db1d7091b88b80f0a58c630c5c1aefc817d - https://www.ibm.com/products/open-sdk-for-rust-aix - https://dadrian.io/blog/posts/corporate-support-xz/ - https://peps.python.org/ - https://cryptography.io/en/latest/hazmat/primitives/asymmetric/ed448/ - https://go.dev/blog/fips140 - https://dadrian.io/blog/posts/roll-your-own-crypto/ 00:00 intro 01:03 The Python Cryptographic Authority 04:38 fckin OpenSSL 09:50 OpenSSL 3 23:17 OSSL_PARAM 31:16 testing and continuous integration 34:48 GitHub Actions, target architectures 35:16 flappy tests 35:47 Intel SDE, rigorous, stable architecture-dependent impls 38:21 Community Maintained Assembly and Bug Handling 39:07 Memory Safety and Rust in Cryptography 39:59 Recent OpenSSL Vulnerabilities 40:09 having the judgment to not write large bits of C code 41:18 BoringSSL vs OpenSSL 42:32 SSL of Theseus-ying OpenSSL with Rust code 43:38 PKCS and P7 47:56 there's Rust in my reptile eggs 57:20 The Python Cryptographic Authority, 10 Years In 01:02:55 Moving Away from OpenSSL 01:09:38 FIPS validating non-C code 01:11:50 👋

The Python cryptography module, pyca/cryptography, has mostly been a sane wrapper around a pile of C, so that users get performant cryptography on...

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