// Copyright 2016 syzkaller project authors. All rights reserved.
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// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
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package hash
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import (
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"bytes"
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"crypto/sha1"
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"encoding/binary"
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"encoding/hex"
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"fmt"
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)
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type Sig [sha1.Size]byte
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func Hash(pieces ...[]byte) Sig {
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h := sha1.New()
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for _, data := range pieces {
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h.Write(data)
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}
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var sig Sig
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copy(sig[:], h.Sum(nil))
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return sig
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}
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func String(pieces ...[]byte) string {
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sig := Hash(pieces...)
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return sig.String()
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}
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func (sig *Sig) String() string {
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return hex.EncodeToString((*sig)[:])
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}
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// Truncate64 returns first 64 bits of the hash as int64.
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func (sig *Sig) Truncate64() int64 {
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var v int64
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if err := binary.Read(bytes.NewReader((*sig)[:]), binary.LittleEndian, &v); err != nil {
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panic(fmt.Sprintf("failed convert hash to id: %v", err))
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}
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return v
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}
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func FromString(str string) (Sig, error) {
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bin, err := hex.DecodeString(str)
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if err != nil {
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return Sig{}, fmt.Errorf("failed to decode sig '%v': %v", str, err)
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}
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if len(bin) != len(Sig{}) {
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return Sig{}, fmt.Errorf("failed to decode sig '%v': bad len", str)
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}
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var sig Sig
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for i, v := range bin {
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sig[i] = v
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}
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return sig, err
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}
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