How to use Hash method of hash Package

Best Syzkaller code snippet using hash.Hash

hash.go

Source:hash.go

...12	"runtime"13	"strings"14	"sync"15)16var debugHash = false // set when GODEBUG=gocachehash=117// HashSize is the number of bytes in a hash.18const HashSize = 3219// A Hash provides access to the canonical hash function used to index the cache.20// The current implementation uses salted SHA256, but clients must not assume this.21type Hash struct {22	h    hash.Hash23	name string        // for debugging24	buf  *bytes.Buffer // for verify25}26// hashSalt is a salt string added to the beginning of every hash27// created by NewHash. Using the Go version makes sure that different28// versions of the go command (or even different Git commits during29// work on the development branch) do not address the same cache30// entries, so that a bug in one version does not affect the execution31// of other versions. This salt will result in additional ActionID files32// in the cache, but not additional copies of the large output files,33// which are still addressed by unsalted SHA256.34//35// We strip any GOEXPERIMENTs the go tool was built with from this36// version string on the assumption that they shouldn't affect go tool37// execution. This allows bootstrapping to converge faster: dist builds38// go_bootstrap without any experiments, so by stripping experiments39// go_bootstrap and the final go binary will use the same salt.40var hashSalt = []byte(stripExperiment(runtime.Version()))41// stripExperiment strips any GOEXPERIMENT configuration from the Go42// version string.43func stripExperiment(version string) string {44	if i := strings.Index(version, " X:"); i >= 0 {45		return version[:i]46	}47	return version48}49// Subkey returns an action ID corresponding to mixing a parent50// action ID with a string description of the subkey.51func Subkey(parent ActionID, desc string) ActionID {52	h := sha256.New()53	h.Write([]byte("subkey:"))54	h.Write(parent[:])55	h.Write([]byte(desc))56	var out ActionID57	h.Sum(out[:0])58	if debugHash {59		fmt.Fprintf(os.Stderr, "HASH subkey %x %q = %x\n", parent, desc, out)60	}61	if verify {62		hashDebug.Lock()63		hashDebug.m[out] = fmt.Sprintf("subkey %x %q", parent, desc)64		hashDebug.Unlock()65	}66	return out67}68// NewHash returns a new Hash.69// The caller is expected to Write data to it and then call Sum.70func NewHash(name string) *Hash {71	h := &Hash{h: sha256.New(), name: name}72	if debugHash {73		fmt.Fprintf(os.Stderr, "HASH[%s]\n", h.name)74	}75	h.Write(hashSalt)76	if verify {77		h.buf = new(bytes.Buffer)78	}79	return h80}81// Write writes data to the running hash.82func (h *Hash) Write(b []byte) (int, error) {83	if debugHash {84		fmt.Fprintf(os.Stderr, "HASH[%s]: %q\n", h.name, b)85	}86	if h.buf != nil {87		h.buf.Write(b)88	}89	return h.h.Write(b)90}91// Sum returns the hash of the data written previously.92func (h *Hash) Sum() [HashSize]byte {93	var out [HashSize]byte94	h.h.Sum(out[:0])95	if debugHash {96		fmt.Fprintf(os.Stderr, "HASH[%s]: %x\n", h.name, out)97	}98	if h.buf != nil {99		hashDebug.Lock()100		if hashDebug.m == nil {101			hashDebug.m = make(map[[HashSize]byte]string)102		}103		hashDebug.m[out] = h.buf.String()104		hashDebug.Unlock()105	}106	return out107}108// In GODEBUG=gocacheverify=1 mode,109// hashDebug holds the input to every computed hash ID,110// so that we can work backward from the ID involved in a111// cache entry mismatch to a description of what should be there.112var hashDebug struct {113	sync.Mutex114	m map[[HashSize]byte]string115}116// reverseHash returns the input used to compute the hash id.117func reverseHash(id [HashSize]byte) string {118	hashDebug.Lock()119	s := hashDebug.m[id]120	hashDebug.Unlock()121	return s122}123var hashFileCache struct {124	sync.Mutex125	m map[string][HashSize]byte126}127// FileHash returns the hash of the named file.128// It caches repeated lookups for a given file,129// and the cache entry for a file can be initialized130// using SetFileHash.131// The hash used by FileHash is not the same as132// the hash used by NewHash.133func FileHash(file string) ([HashSize]byte, error) {134	hashFileCache.Lock()135	out, ok := hashFileCache.m[file]136	hashFileCache.Unlock()137	if ok {138		return out, nil139	}140	h := sha256.New()141	f, err := os.Open(file)142	if err != nil {143		if debugHash {144			fmt.Fprintf(os.Stderr, "HASH %s: %v\n", file, err)145		}146		return [HashSize]byte{}, err147	}148	_, err = io.Copy(h, f)149	f.Close()150	if err != nil {151		if debugHash {152			fmt.Fprintf(os.Stderr, "HASH %s: %v\n", file, err)153		}154		return [HashSize]byte{}, err155	}156	h.Sum(out[:0])157	if debugHash {158		fmt.Fprintf(os.Stderr, "HASH %s: %x\n", file, out)159	}160	SetFileHash(file, out)161	return out, nil162}163// SetFileHash sets the hash returned by FileHash for file.164func SetFileHash(file string, sum [HashSize]byte) {165	hashFileCache.Lock()166	if hashFileCache.m == nil {167		hashFileCache.m = make(map[string][HashSize]byte)168	}169	hashFileCache.m[file] = sum170	hashFileCache.Unlock()171}...

Hash

Using AI Code Generation

1import "fmt"2import "crypto/sha1"3func main() {4    h := sha1.New()5    h.Write([]byte(s))6    bs := h.Sum(nil)7    fmt.Println(s)8    fmt.Printf("%x9}10import "fmt"11import "crypto/md5"12func main() {13    h := md5.New()14    h.Write([]byte(s))15    bs := h.Sum(nil)16    fmt.Println(s)17    fmt.Printf("%x18}

Hash

Using AI Code Generation

1import (2func main() {3	h := crc32.NewIEEE()4	h.Write([]byte("test"))5	v := h.Sum32()6	fmt.Println(v)7}8import (9func main() {10	h := crc32.NewIEEE()11	h.Write([]byte("test"))12	v := h.Sum32()13	fmt.Println(v)14}15import (16func main() {17	h := crc64.New(crc64.MakeTable(crc64.ISO))18	h.Write([]byte("test"))19	v := h.Sum64()20	fmt.Println(v)21}

Hash

Using AI Code Generation

1import (2func main() {3h := crc32.NewIEEE()4h.Write([]byte("test"))5v := h.Sum32()6fmt.Println(v)7}8import (9func main() {10h := crc32.NewIEEE()11h.Write([]byte("test"))12v := h.Sum32()13fmt.Println(v)14}15import (16func main() {17h := crc32.NewIEEE()18h.Write([]byte("test"))19v := h.Sum32()20fmt.Println(v)21}22import (23func main() {24h := crc32.NewIEEE()25h.Write([]byte("test"))26v := h.Sum32()27fmt.Println(v)28}29import (30func main() {31h := crc32.NewIEEE()32h.Write([]byte("test"))33v := h.Sum32()34fmt.Println(v)35}36import (37func main() {38h := crc32.NewIEEE()39h.Write([]byte("test"))40v := h.Sum32()41fmt.Println(v)42}43import (44func main() {45h := crc32.NewIEEE()46h.Write([]byte("test"))47v := h.Sum32()48fmt.Println(v)49}50import (

Hash

Using AI Code Generation

1import (2func main() {3	h := crc32.NewIEEE()4	h.Write([]byte("test"))5	v := h.Sum32()6	fmt.Println(v)7	h = crc32.NewIEEE()8	h.Write([]byte{1, 2, 3, 4})9	v = h.Sum32()10	fmt.Println(v)11}

Hash

Using AI Code Generation

1import (2func main() {3	hash := md5.New()4	hash.Write([]byte("Hello, World!"))5	fmt.Printf("%x6", hash.Sum(nil))7}8import (9func main() {10	hash := sha256.New()11	hash.Write([]byte("Hello, World!"))12	fmt.Printf("%x13", hash.Sum(nil))14}

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