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Doc: OpenSSL API modernization (SparkPost/Momentum#1276)#850

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Momentum#1276_OpenSSL_API_deprecation_cleanup
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Doc: OpenSSL API modernization (SparkPost/Momentum#1276)#850
dkoerichbird wants to merge 2 commits into
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Momentum#1276_OpenSSL_API_deprecation_cleanup

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@dkoerichbird dkoerichbird commented Jun 3, 2026

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Documentation-only updates to TLS/OpenSSL options and 5.3.0 changelog; no product code changes.

Overview
Documents Momentum 5.3.0 / I-1276 OpenSSL modernization (supported 1.1.1 through 3.5.x; pre-1.1.1 compatibility retired).

Removed in 5.3.0 (pages kept for older releases): crypto_lock_method and ssl_lock_method are marked removed—OpenSSL is internally thread-safe and legacy locking callbacks are gone; stale ecelerity.conf entries are silently ignored. Console tls rekey is documented as removed (temporary RSA / export-grade path); summary tables now show 4.0 through 5.2 for those options and tls rekey.

Updated TLS guidance: tls_protocols explains that config tokens remain for compatibility but negotiated protocols depend on OpenSSL and OS crypto policy (e.g. RHEL 8 DEFAULT → TLS 1.2/1.3 only); example shifts to disabling SSLv3 and TLS 1.0/1.1. tlsv13_ciphersuites broadens OpenSSL version wording and replaces openssl11 CLI examples with openssl.

Changelog: Adds the I-1276 enhancement row to 5.3.0.

Reviewed by Cursor Bugbot for commit be3ef72. Bugbot is set up for automated code reviews on this repo. Configure here.

Signed-off-by: Doug Koerich <douglas.koerich@bird.com>
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…um#1276)

Signed-off-by: Doug Koerich <douglas.koerich@bird.com>
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