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gh-99108: Replace SHA2-224 & 256 with verified code from HACL* (#99109)

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replacing hashlib primitives (for the non-OpenSSL case) with verified implementations from HACL*. This is the first PR in the series, and focuses specifically on SHA2-256 and SHA2-224.

This PR imports Hacl_Streaming_SHA2 into the Python tree. This is the HACL* implementation of SHA2, which combines a core implementation of SHA2 along with a layer of buffer management that allows updating the digest with any number of bytes. This supersedes the previous implementation in the tree.

@franziskuskiefer was kind enough to benchmark the changes: in addition to being verified (thus providing significant safety and security improvements), this implementation also provides a sizeable performance boost!

```
---------------------------------------------------------------
Benchmark                     Time             CPU   Iterations
---------------------------------------------------------------
Sha2_256_Streaming            3163 ns      3160 ns       219353     // this PR
LibTomCrypt_Sha2_256          5057 ns      5056 ns       136234     // library used by Python currently
``` 

The changes in this PR are as follows:
- import the subset of HACL* that covers SHA2-256/224 into `Modules/_hacl`
- rewire sha256module.c to use the HACL* implementation

Co-authored-by: Gregory P. Smith [Google LLC] <greg@krypto.org>
Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>
This commit is contained in:
Jonathan Protzenko 2023-02-06 18:11:01 -08:00 • committed by GitHub
parent 914f8fd9f7
commit 1fcc0efdaa
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Modules/Setup.stdlib.in
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@ -79,7 +79,7 @@
# hashing builtins, can be disabled with --without-builtin-hashlib-hashes
@MODULE__MD5_TRUE@_md5 md5module.c
@MODULE__SHA1_TRUE@_sha1 sha1module.c
@MODULE__SHA256_TRUE@_sha256 sha256module.c
@MODULE__SHA256_TRUE@_sha256 sha256module.c _hacl/Hacl_Streaming_SHA2.c
@MODULE__SHA512_TRUE@_sha512 sha512module.c
@MODULE__SHA3_TRUE@_sha3 _sha3/sha3module.c
@MODULE__BLAKE2_TRUE@_blake2 _blake2/blake2module.c _blake2/blake2b_impl.c _blake2/blake2s_impl.c