[3.12] gh-117233: Detect support for several hashes at hashlib build time (GH-117234) #117767
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…ime (pythonGH-117234) Detect libcrypto BLAKE2, Shake, SHA3, and Truncated-SHA512 support at hashlib build time GH-GH- BLAKE2 While OpenSSL supports both "b" and "s" variants of the BLAKE2 hash function, other cryptographic libraries may lack support for one or both of the variants. This commit modifies `hashlib`'s C code to detect whether or not the linked libcrypto supports each BLAKE2 variant, and elides references to each variant's NID accordingly. In cases where the underlying libcrypto doesn't fully support BLAKE2, CPython's `./configure` script can be given the following flag to use CPython's interned BLAKE2 implementation: `--with-builtin-hashlib-hashes=blake2`. GH-GH- SHA3, Shake, & truncated SHA512. Detect BLAKE2, SHA3, Shake, & truncated SHA512 support in the OpenSSL-ish libcrypto library at build time. This helps allow hashlib's `_hashopenssl` to be used with libraries that do not to support every algorithm that upstream OpenSSL does. Such as AWS-LC & BoringSSL. (cherry picked from commit b8eaad3) Co-authored-by: Will Childs-Klein <willck93@gmail.com> Co-authored-by: Gregory P. Smith [Google LLC] <greg@krypto.org>
This was referenced Apr 11, 2024
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Detect libcrypto BLAKE2, Shake, SHA3, and Truncated-SHA512 support at hashlib build time
GH-GH- BLAKE2
While OpenSSL supports both "b" and "s" variants of the BLAKE2 hash
function, other cryptographic libraries may lack support for one or both
of the variants. This commit modifies
hashlib's C code to detectwhether or not the linked libcrypto supports each BLAKE2 variant, and
elides references to each variant's NID accordingly. In cases where the
underlying libcrypto doesn't fully support BLAKE2, CPython's
./configurescript can be given the following flag to use CPython'sinterned BLAKE2 implementation:
--with-builtin-hashlib-hashes=blake2.GH-GH- SHA3, Shake, & truncated SHA512.
Detect BLAKE2, SHA3, Shake, & truncated SHA512 support in the
OpenSSL-ish libcrypto library at build time. This helps allow hashlib's
_hashopensslto be used with libraries that do not to support everyalgorithm that upstream OpenSSL does. Such as AWS-LC & BoringSSL.
(cherry picked from commit b8eaad3)
Co-authored-by: Will Childs-Klein willck93@gmail.com
Co-authored-by: Gregory P. Smith [Google LLC] greg@krypto.org