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28 lines
978 B
28 lines
978 B
// 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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