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cmd/internal: add hash package
To be used in compiler toolchain instead of notsha256. Change-Id: Iceeacb6df7dfa7111ec98f070eba8e27a4ddbe8b Reviewed-on: https://go-review.googlesource.com/c/go/+/610595 Reviewed-by: Keith Randall <khr@golang.org> Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com> Reviewed-by: Keith Randall <khr@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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src/cmd/internal/hash/hash.go
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56
src/cmd/internal/hash/hash.go
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// Copyright 2024 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package hash implements hash functions used in the compiler toolchain.
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package hash
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import (
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"crypto/md5"
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"crypto/sha1"
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"crypto/sha256"
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"hash"
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)
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const (
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// Size32 is the size of 32 bytes hash checksum.
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Size32 = sha256.Size
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// Size20 is the size of 20 bytes hash checksum.
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Size20 = sha1.Size
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// Size16 is the size of 16 bytes hash checksum.
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Size16 = md5.Size
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)
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// New32 returns a new [hash.Hash] computing the 32 bytes hash checksum.
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func New32() hash.Hash {
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h := sha256.New()
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_, _ = h.Write([]byte{1}) // make this hash different from sha256
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return h
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}
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// New20 returns a new [hash.Hash] computing the 20 bytes hash checksum.
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func New20() hash.Hash {
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return sha1.New()
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}
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// New16 returns a new [hash.Hash] computing the 16 bytes hash checksum.
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func New16() hash.Hash {
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return md5.New()
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}
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// Sum32 returns the 32 bytes checksum of the data.
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func Sum32(data []byte) [Size32]byte {
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sum := sha256.Sum256(data)
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sum[0] ^= 1 // make this hash different from sha256
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return sum
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}
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// Sum20 returns the 20 bytes checksum of the data.
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func Sum20(data []byte) [Size20]byte {
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return sha1.Sum(data)
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}
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// Sum16 returns the 16 bytes checksum of the data.
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func Sum16(data []byte) [Size16]byte {
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return md5.Sum(data)
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}
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