This crate contains the logic to build OpenSSL and is intended to be consumed by the openssl-sys crate. You likely in theory aren't interacting with this too much!

There are currently two maintained branches, matching the two maintained OpenSSL versions:

• main which builds OpenSSL 3.1
• release/111 which builds OpenSSL 1.1.1

The crates versions follow the X.Y.Z+B pattern:

• The major version X is the upstream OpenSSL version:
  • 111 for 1.1.1
  • 300 for 3.0 (to be higher than 111)
• The minor Y and patch Z versions are incremented when making changes to the crate, either OpenSSL update or internal changes.
• B contains the full upstream OpenSSL version, like 1.1.1k or 3.0.7. Note that this field is actually ignored in comparisons and only there for documentation.

Building OpenSSL for windows-msvc targets, users can choose whether to enable assembly language routines, which requires nasm.
The build process will automatically detect whether nasm.exe is installed in PATH. If found, the assembly language routines will be enabled (in other words, the no-asm option will NOT be configured).

You can manipulate this behavior by setting the OPENSSL_RUST_USE_NASM environment variable:

• 1: Force enable the assembly language routines. (panic if nasm.exe is not available.)
• 0: Force disable the assembly language routines even if the nasm.exe can be found in PATH.
• not set: Let the build process automatically detect whether nasm.exe is installed. If found, enable. If not, disable.

However, this environment variable does NOT take effects on non-windows platforms.

This project is licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in openssl-src by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.