mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-11-11 04:11:18 +01:00
0d8478cff8
- In Go 1.21 the crypto/sha256 [got a massive improvement](https://go.dev/doc/go1.21#crypto/sha256) by utilizing the SHA instructions for AMD64 CPUs, which sha256-simd already was doing. The performance is now on par and I think it's preferable to use the standard library rather than a package when possible. ``` 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% ``` (cherry picked from commitabd94ff5b5) (cherry picked from commit15e81637ab) Conflicts: go.mod https://codeberg.org/forgejo/forgejo/pulls/1581 (cherry picked from commit 5caea2d75aeac78fb306f58a3cf7809d5b70c7f2) (cherry picked from commit08da542cce) (cherry picked from commitd71a8cc9fb) (cherry picked from commit63c9fc2bee) (cherry picked from commite1db85d48a) (cherry picked from commit5e86a5d2d1)
28 lines
978 B
Go
28 lines
978 B
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
package avatar
|
|
|
|
import (
|
|
"crypto/sha256"
|
|
"encoding/hex"
|
|
"strconv"
|
|
)
|
|
|
|
// HashAvatar will generate a unique string, which ensures that when there's a
|
|
// different unique ID while the data is the same, it will generate a different
|
|
// output. It will generate the output according to:
|
|
// HEX(HASH(uniqueID || - || data))
|
|
// The hash being used is SHA256.
|
|
// The sole purpose of the unique ID is to generate a distinct hash Such that
|
|
// two unique IDs with the same data will have a different hash output.
|
|
// The "-" byte is important to ensure that data cannot be modified such that
|
|
// the first byte is a number, which could lead to a "collision" with the hash
|
|
// of another unique ID.
|
|
func HashAvatar(uniqueID int64, data []byte) string {
|
|
h := sha256.New()
|
|
h.Write([]byte(strconv.FormatInt(uniqueID, 10)))
|
|
h.Write([]byte{'-'})
|
|
h.Write(data)
|
|
return hex.EncodeToString(h.Sum(nil))
|
|
}
|