Note: The Python Cryptographic Authority strongly suggests the use of pyca/cryptography where possible. If you are using pyOpenSSL for anything other than making a TLS connection you should move to cryptography and drop your pyOpenSSL dependency.
High-level wrapper around a subset of the OpenSSL library. Includes
… and much more.
You can find more information in the documentation. Development takes place on GitHub.
Release Information 25.1.0 (2025-05-17) Backward-incompatible changes: Deprecations:Attempting using any methods that mutate an OpenSSL.SSL.Context after it has been used to create an OpenSSL.SSL.Connection will emit a warning. In a future release, this will raise an exception.
cryptography maximum version has been increased to 45.0.x.
Corrected type annotations on Context.set_alpn_select_callback, Context.set_session_cache_mode, Context.set_options, Context.set_mode, X509.subject_name_hash, and X509Store.load_locations.
Deprecated APIs are now marked using warnings.deprecated. mypy will emit deprecation notices for them when used with --enable-error-code deprecated.
Removed the deprecated OpenSSL.crypto.CRL, OpenSSL.crypto.Revoked, OpenSSL.crypto.dump_crl, and OpenSSL.crypto.load_crl. cryptography.x509’s CRL functionality should be used instead.
Removed the deprecated OpenSSL.crypto.sign and OpenSSL.crypto.verify. cryptography.hazmat.primitives.asymmetric’s signature APIs should be used instead.
Deprecated OpenSSL.rand - callers should use os.urandom() instead.
Deprecated add_extensions and get_extensions on OpenSSL.crypto.X509Req and OpenSSL.crypto.X509. These should have been deprecated at the same time X509Extension was. Users should use pyca/cryptography’s X.509 APIs instead.
Deprecated OpenSSL.crypto.get_elliptic_curves and OpenSSL.crypto.get_elliptic_curve, as well as passing the reult of them to OpenSSL.SSL.Context.set_tmp_ecdh, users should instead pass curves from cryptography.
Deprecated passing X509 objects to OpenSSL.SSL.Context.use_certificate, OpenSSL.SSL.Connection.use_certificate, OpenSSL.SSL.Context.add_extra_chain_cert, and OpenSSL.SSL.Context.add_client_ca, users should instead pass cryptography.x509.Certificate instances. This is in preparation for deprecating pyOpenSSL’s X509 entirely.
Deprecated passing PKey objects to OpenSSL.SSL.Context.use_privatekey and OpenSSL.SSL.Connection.use_privatekey, users should instead pass cryptography priate key instances. This is in preparation for deprecating pyOpenSSL’s PKey entirely.
cryptography maximum version has been increased to 44.0.x.
OpenSSL.SSL.Connection.get_certificate, OpenSSL.SSL.Connection.get_peer_certificate, OpenSSL.SSL.Connection.get_peer_cert_chain, and OpenSSL.SSL.Connection.get_verified_chain now take an as_cryptography keyword-argument. When True is passed then cryptography.x509.Certificate are returned, instead of OpenSSL.crypto.X509. In the future, passing False (the default) will be deprecated.
Fixed changelog to remove sphinx specific restructured text strings.
Deprecated OpenSSL.crypto.X509Req, OpenSSL.crypto.load_certificate_request, OpenSSL.crypto.dump_certificate_request. Instead, cryptography.x509.CertificateSigningRequest, cryptography.x509.CertificateSigningRequestBuilder, cryptography.x509.load_der_x509_csr, or cryptography.x509.load_pem_x509_csr should be used.
Added type hints for the SSL module. #1308.
Changed OpenSSL.crypto.PKey.from_cryptography_key to accept public and private EC, ED25519, ED448 keys. #1310.
Removed the deprecated OpenSSL.crypto.PKCS12 and OpenSSL.crypto.NetscapeSPKI. OpenSSL.crypto.PKCS12 may be replaced by the PKCS#12 APIs in the cryptography package.
Added OpenSSL.SSL.Connection.get_selected_srtp_profile to determine which SRTP profile was negotiated. #1279.
Dropped support for Python 3.6.
The minimum cryptography version is now 41.0.5.
Removed OpenSSL.crypto.load_pkcs7 and OpenSSL.crypto.load_pkcs12 which had been deprecated for 3 years.
Added OpenSSL.SSL.OP_LEGACY_SERVER_CONNECT to allow legacy insecure renegotiation between OpenSSL and unpatched servers. #1234.
Deprecated OpenSSL.crypto.PKCS12 (which was intended to have been deprecated at the same time as OpenSSL.crypto.load_pkcs12).
Deprecated OpenSSL.crypto.NetscapeSPKI.
Deprecated OpenSSL.crypto.CRL
Deprecated OpenSSL.crypto.Revoked
Deprecated OpenSSL.crypto.load_crl and OpenSSL.crypto.dump_crl
Deprecated OpenSSL.crypto.sign and OpenSSL.crypto.verify
Deprecated OpenSSL.crypto.X509Extension
Changed OpenSSL.crypto.X509Store.add_crl to also accept cryptography’s x509.CertificateRevocationList arguments in addition to the now deprecated OpenSSL.crypto.CRL arguments.
Fixed test_set_default_verify_paths test so that it is skipped if no network connection is available.
Removed X509StoreFlags.NOTIFY_POLICY. #1213.
cryptography maximum version has been increased to 41.0.x.
Invalid versions are now rejected in OpenSSL.crypto.X509Req.set_version.
Added X509VerificationCodes to OpenSSL.SSL. #1202.
Worked around an issue in OpenSSL 3.1.0 which caused X509Extension.get_short_name to raise an exception when no short name was known to OpenSSL. #1204.
cryptography maximum version has been increased to 40.0.x.
Add OpenSSL.SSL.Connection.DTLSv1_get_timeout and OpenSSL.SSL.Connection.DTLSv1_handle_timeout to support DTLS timeouts #1180.
Add OpenSSL.SSL.X509StoreFlags.PARTIAL_CHAIN constant to allow for users to perform certificate verification on partial certificate chains. #1166
cryptography maximum version has been increased to 39.0.x.
Remove support for SSLv2 and SSLv3.
The minimum cryptography version is now 38.0.x (and we now pin releases against cryptography major versions to prevent future breakage)
The OpenSSL.crypto.X509StoreContextError exception has been refactored, changing its internal attributes. #1133
OpenSSL.SSL.SSLeay_version is deprecated in favor of OpenSSL.SSL.OpenSSL_version. The constants OpenSSL.SSL.SSLEAY_* are deprecated in favor of OpenSSL.SSL.OPENSSL_*.
Add OpenSSL.SSL.Connection.set_verify and OpenSSL.SSL.Connection.get_verify_mode to override the context object’s verification flags. #1073
Add OpenSSL.SSL.Connection.use_certificate and OpenSSL.SSL.Connection.use_privatekey to set a certificate per connection (and not just per context) #1121.
Drop support for Python 2.7. #1047
The minimum cryptography version is now 35.0.
The minimum cryptography version is now 3.3.
Drop support for Python 3.5
Raise an error when an invalid ALPN value is set. #993
Added OpenSSL.SSL.Context.set_min_proto_version and OpenSSL.SSL.Context.set_max_proto_version to set the minimum and maximum supported TLS version #985.
Updated to_cryptography and from_cryptography methods to support an upcoming release of cryptography without raising deprecation warnings. #1030
Fixed compatibility with OpenSSL 1.1.0.
The minimum cryptography version is now 3.2.
Remove deprecated OpenSSL.tsafe module.
Removed deprecated OpenSSL.SSL.Context.set_npn_advertise_callback, OpenSSL.SSL.Context.set_npn_select_callback, and OpenSSL.SSL.Connection.get_next_proto_negotiated.
Drop support for Python 3.4
Drop support for OpenSSL 1.0.1 and 1.0.2
Deprecated OpenSSL.crypto.load_pkcs7 and OpenSSL.crypto.load_pkcs12.
Added a new optional chain parameter to OpenSSL.crypto.X509StoreContext() where additional untrusted certificates can be specified to help chain building. #948
Added OpenSSL.crypto.X509Store.load_locations to set trusted certificate file bundles and/or directories for verification. #943
Added Context.set_keylog_callback to log key material. #910
Added OpenSSL.SSL.Connection.get_verified_chain to retrieve the verified certificate chain of the peer. #894.
Make verification callback optional in Context.set_verify. If omitted, OpenSSL’s default verification is used. #933
Fixed a bug that could truncate or cause a zero-length key error due to a null byte in private key passphrase in OpenSSL.crypto.load_privatekey and OpenSSL.crypto.dump_privatekey. #947
Removed deprecated ContextType, ConnectionType, PKeyType, X509NameType, X509ReqType, X509Type, X509StoreType, CRLType, PKCS7Type, PKCS12Type, and NetscapeSPKIType aliases. Use the classes without the Type suffix instead. #814
The minimum cryptography version is now 2.8 due to issues on macOS with a transitive dependency. #875
Deprecated OpenSSL.SSL.Context.set_npn_advertise_callback, OpenSSL.SSL.Context.set_npn_select_callback, and OpenSSL.SSL.Connection.get_next_proto_negotiated. ALPN should be used instead. #820
Support bytearray in SSL.Connection.send() by using cffi’s from_buffer. #852
The OpenSSL.SSL.Context.set_alpn_select_callback can return a new NO_OVERLAPPING_PROTOCOLS sentinel value to allow a TLS handshake to complete without an application protocol.
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