hash.go

     1  // Copyright 2024 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // Package hash implements hash functions used in the compiler toolchain.
     6  package hash
     7  
     8  import (
     9  	"crypto/sha256"
    10  	"hash"
    11  )
    12  
    13  // Size32 is the size of the 32-byte hash functions [New32] and [Sum32].
    14  const Size32 = 32
    15  
    16  // New32 returns a new [hash.Hash] computing the 32-byte hash checksum.
    17  // Note that New32 and [Sum32] compute different hashes.
    18  func New32() hash.Hash {
    19  	h := sha256.New()
    20  	_, _ = h.Write([]byte{1}) // make this hash different from sha256
    21  	return h
    22  }
    23  
    24  // Sum32 returns a 32-byte checksum of the data.
    25  // Note that Sum32 and [New32] compute different hashes.
    26  func Sum32(data []byte) [32]byte {
    27  	sum := sha256.Sum256(data)
    28  	sum[0] ^= 0xff // make this hash different from sha256
    29  	return sum
    30  }
    31
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