OpenSSL Migration Guide Overview

The OpenSSL migration guide provides details on the changes required to migrate to new versions of OpenSSL, specifically covering OpenSSL 3.0 & 3.1. Some of the main changes include:

• For OpenSSL 3.1, the FIPS provider now includes some non-FIPS-validated algorithms. The property query fips=yes is mandatory for applications wanting to operate in a FIPS-approved manner.
• OpenSSL 3.0 is a major release, requiring applications using older versions to at least be recompiled to work with the new version.
• A significant change in OpenSSL 3.0 is the introducing of the Provider concept, which groups algorithm implementations.
• OpenSSL 3.0 has deprecated the use of low-level APIs in favor of high-level APIs.
• The licensing for OpenSSL has changed from the dual OpenSSL and SSLeay licenses to the Apache License v2.
• There are also updates related to algorithms, key validation, error codes, and more.

Further details can be found in the original documentation.

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