GustedandGitHub 356c5055ad lib/sha256: Remove it (#9643) ...

### Purpose

Remove the `lib/sha256` package, because it's no longer necessary. Go's
standard library now has the same performance and is on par with
`sha256-simd` since [Since Go
1.21](https://github.com/golang/go/commit/1a64574f42b95594cf9c8a12e9ca13d75585429c).
Therefore using `sha256-simd` has no benefits anymore.

ARM already has optimized sha256 assembly code since
https://github.com/golang/go/commit/7b8a7f8272fd1941a199af1adb334bd9996e8909,
`sha256-simd` published their results before that optimized assembly was
implemented,
https://github.com/minio/sha256-simd/commit/f941fedda826b68a196de2e0a9183e273ec0cb91.
The assembly looks very similar and the benchmarks in the Go commit
match that of `sha256-simd`.

This patch removes all of the related code of `lib/sha256` and makes
`crypto/sha256` the 'default'.

Benchmark of `sha256-simd` and `crypto/sha256`:
<details>

```
cpu: AMD Ryzen 5 3600X 6-Core Processor
                │  simd.txt   │               go.txt                │
                │   sec/op    │    sec/op     vs base               │
Hash/8Bytes-12    63.25n ± 1%    73.38n ± 1%  +16.02% (p=0.002 n=6)
Hash/64Bytes-12   98.73n ± 1%   105.30n ± 1%   +6.65% (p=0.002 n=6)
Hash/1K-12        567.2n ± 1%    572.8n ± 1%   +0.99% (p=0.002 n=6)
Hash/8K-12        4.062µ ± 1%    4.062µ ± 1%        ~ (p=0.396 n=6)
Hash/1M-12        512.1µ ± 0%    510.6µ ± 1%        ~ (p=0.485 n=6)
Hash/5M-12        2.556m ± 1%    2.564m ± 0%        ~ (p=0.093 n=6)
Hash/10M-12       5.112m ± 0%    5.127m ± 0%        ~ (p=0.093 n=6)
geomean           13.82µ         14.27µ        +3.28%

                │   simd.txt   │               go.txt                │
                │     B/s      │     B/s       vs base               │
Hash/8Bytes-12    120.6Mi ± 1%   104.0Mi ± 1%  -13.81% (p=0.002 n=6)
Hash/64Bytes-12   618.2Mi ± 1%   579.8Mi ± 1%   -6.22% (p=0.002 n=6)
Hash/1K-12        1.682Gi ± 1%   1.665Gi ± 1%   -0.98% (p=0.002 n=6)
Hash/8K-12        1.878Gi ± 1%   1.878Gi ± 1%        ~ (p=0.310 n=6)
Hash/1M-12        1.907Gi ± 0%   1.913Gi ± 1%        ~ (p=0.485 n=6)
Hash/5M-12        1.911Gi ± 1%   1.904Gi ± 0%        ~ (p=0.093 n=6)
Hash/10M-12       1.910Gi ± 0%   1.905Gi ± 0%        ~ (p=0.093 n=6)
geomean           1.066Gi        1.032Gi        -3.18%
```

</details>


### Testing

Compiled and tested on Linux.

### Documentation

https://github.com/syncthing/docs/pull/874

2024-08-10 12:58:20 +01:00

..

mocks

all: minimal set of changes for iOS app (#9619)

2024-07-31 07:31:14 +02:00

testdata

all: Grand test refactor (fixes #8779, fixes #8799)

2023-05-09 10:01:57 +00:00

blockpullreorderer_test.go

all: Remove miscellaneous vestigial code (#7495)

2021-03-17 22:23:12 +01:00

blockpullreorderer.go

lib/model: Add support for different puller block ordering (#6587)

2020-05-11 22:44:04 +01:00

debug.go

all, lib/logger: Refactor SetDebug calls (#6054)

2019-10-04 13:03:34 +02:00

deviceactivity_test.go

lib/model: Return index from deviceActivity.leastBusy

2021-11-26 12:07:43 +01:00

deviceactivity.go

lib/model: Return index from deviceActivity.leastBusy

2021-11-26 12:07:43 +01:00

devicedownloadstate_test.go

all: Move remaining protos to use the vanity plugin (#7009)

2020-10-02 08:07:05 +02:00

devicedownloadstate.go

all: Move remaining protos to use the vanity plugin (#7009)

2020-10-02 08:07:05 +02:00

doc.go

all: Update license url to https (ref #3976)

2017-02-09 08:04:16 +01:00

fakeconns_test.go

lib/protocol: Refactor interface (#9375)

2024-01-31 08:18:27 +01:00

folder_recvenc.go

all: Remove lib/util package (#9049)

2023-08-21 19:44:33 +02:00

folder_recvonly_test.go

lib/protocol: Refactor interface (#9375)

2024-01-31 08:18:27 +01:00

folder_recvonly.go

all: Remove lib/util package (#9049)

2023-08-21 19:44:33 +02:00

folder_sendonly.go

lib/ignore: Refactor out result type (#9343)

2024-01-13 18:58:23 +01:00

folder_sendrecv_test.go

lib/protocol: Refactor interface (#9375)

2024-01-31 08:18:27 +01:00

folder_sendrecv_unix.go

all: Support syncing ownership (fixes #1329) (#8434)

2022-07-26 08:24:58 +02:00

folder_sendrecv_windows.go

all: Support syncing ownership (fixes #1329) (#8434)

2022-07-26 08:24:58 +02:00

folder_sendrecv.go

lib/sha256: Remove it (#9643)

2024-08-10 12:58:20 +01:00

folder_summary.go

all: minimal set of changes for iOS app (#9619)

2024-07-31 07:31:14 +02:00

folder_test.go

all: Grand test refactor (fixes #8779, fixes #8799)

2023-05-09 10:01:57 +00:00

folder.go

lib/model: Only handle relevant folder summaries (kqueue) (fixes #9183) (#9288)

2023-12-13 12:34:24 +01:00

folderstate.go

all: Add Prometheus-style metrics to expose some internal performance counters (fixes #5175) (#9003)

2023-08-04 19:57:30 +02:00

indexhandler_test.go

lib/model: Deflake new IndexHandlerTest (#9412)

2024-02-11 09:03:12 +01:00

indexhandler.go

lib/model: Don't bump seq on error in index handler (#9459)

2024-03-11 07:30:21 +01:00

metrics.go

all: Add Prometheus-style metrics to expose some internal performance counters (fixes #5175) (#9003)

2023-08-04 19:57:30 +02:00

model_test.go

all: minimal set of changes for iOS app (#9619)

2024-07-31 07:31:14 +02:00

model.go

all: minimal set of changes for iOS app (#9619)

2024-07-31 07:31:14 +02:00

progressemitter_test.go

all: minimal set of changes for iOS app (#9619)

2024-07-31 07:31:14 +02:00

progressemitter.go

all: minimal set of changes for iOS app (#9619)

2024-07-31 07:31:14 +02:00

queue_test.go

all: Use some Go 1.21 features (#9409)

2024-02-10 21:02:42 +01:00

queue.go

lib/model: Optimize jobQueue performance and memory use (#8023)

2021-10-29 20:20:46 +02:00

requests_test.go

lib/protocol: Refactor interface (#9375)

2024-01-31 08:18:27 +01:00

sentdownloadstate.go

all: Fix various user-facing and non-user-facing typos (#8509)

2022-08-23 15:44:11 +02:00

service_map_test.go

lib/model: Refactor folderRunners to use a serviceMap (#9071)

2023-09-02 16:42:46 +02:00

service_map.go

lib/model: Remove spurious "replacing service" failure event (ref #9271)

2023-12-11 07:43:40 +01:00

sharedpullerstate_test.go

all: Grand test refactor (fixes #8779, fixes #8799)

2023-05-09 10:01:57 +00:00

sharedpullerstate.go

all: minimal set of changes for iOS app (#9619)

2024-07-31 07:31:14 +02:00

testos_test.go

all: Grand test refactor (fixes #8779, fixes #8799)

2023-05-09 10:01:57 +00:00

testutils_test.go

lib/protocol: Refactor interface (#9375)

2024-01-31 08:18:27 +01:00

util.go

lib/model: Use a single lock (phase two: cleanup) (#9276)

2023-12-11 22:06:45 +01:00

utils_test.go

all: Grand test refactor (fixes #8779, fixes #8799)

2023-05-09 10:01:57 +00:00