fa37a211fb
- 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 commit abd94ff5b59c86e793fd9bf12187ea6cfd1f3fa1) (cherry picked from commit 15e81637abf70576a564cf9eecaa9640228afb5b) Conflicts: go.mod https://codeberg.org/forgejo/forgejo/pulls/1581 (cherry picked from commit 325d92917f655c999b81b08832ee623d6b669f0f) Conflicts: modules/context/context_cookie.go https://codeberg.org/forgejo/forgejo/pulls/1617 (cherry picked from commit 358819e8959886faa171ac16541097500d0a703e) (cherry picked from commit 362fd7aae17832fa922fa017794bc564ca43060d) (cherry picked from commit 4f64ee294ee05c93042b6ec68f0a179ec249dab9) (cherry picked from commit 4bde77f7b13c5f961c141c01b6da1f9eda5ec387) (cherry picked from commit 1311e30a811675eb623692349e4e808a85aabef6) (cherry picked from commit 57b69e334c2973118488b9b5dbdc8a2c88135756) (cherry picked from commit 52dc892fadecf39e89c3c351edc9efb42522257b) (cherry picked from commit 77f54f4187869c6eabcc837742fd3f908093a76c) (cherry picked from commit 0d0392f3a510ce3683bb649dee1e65b45dd91354) Conflicts: go.mod https://codeberg.org/forgejo/forgejo/pulls/2034 (cherry picked from commit 92798364e8fe3188a2100b54f3adea943f8309e9) (cherry picked from commit 43d218127752aa9251c4c3ef71b9c060f109dffc) (cherry picked from commit 45c88b86a35729fc0b2dc6b72bc33caf9f69265f) (cherry picked from commit a1cd6f4e3a7956773cbc0aef8abb80d17b62eb49) (cherry picked from commit 01191dc2adf8c57ae448be37e73158005a8ff74d) (cherry picked from commit 151e07f37e2854ad633f1352fb0ce3cd06f4b2ae)
29 lines
978 B
Go
29 lines
978 B
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package avatar
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import (
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"crypto/sha256"
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"encoding/hex"
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"strconv"
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)
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// HashAvatar will generate a unique string, which ensures that when there's a
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// different unique ID while the data is the same, it will generate a different
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// output. It will generate the output according to:
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// HEX(HASH(uniqueID || - || data))
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// The hash being used is SHA256.
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// The sole purpose of the unique ID is to generate a distinct hash Such that
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// two unique IDs with the same data will have a different hash output.
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// The "-" byte is important to ensure that data cannot be modified such that
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// the first byte is a number, which could lead to a "collision" with the hash
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// of another unique ID.
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func HashAvatar(uniqueID int64, data []byte) string {
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h := sha256.New()
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h.Write([]byte(strconv.FormatInt(uniqueID, 10)))
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h.Write([]byte{'-'})
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h.Write(data)
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return hex.EncodeToString(h.Sum(nil))
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}
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