307 lines
8.7 KiB
Go
307 lines
8.7 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package sha3
|
|
|
|
// Tests include all the ShortMsgKATs provided by the Keccak team at
|
|
// https://github.com/gvanas/KeccakCodePackage
|
|
//
|
|
// They only include the zero-bit case of the bitwise testvectors
|
|
// published by NIST in the draft of FIPS-202.
|
|
|
|
import (
|
|
"bytes"
|
|
"compress/flate"
|
|
"encoding/hex"
|
|
"encoding/json"
|
|
"hash"
|
|
"os"
|
|
"strings"
|
|
"testing"
|
|
)
|
|
|
|
const (
|
|
testString = "brekeccakkeccak koax koax"
|
|
katFilename = "testdata/keccakKats.json.deflate"
|
|
)
|
|
|
|
// Internal-use instances of SHAKE used to test against KATs.
|
|
func newHashShake128() hash.Hash {
|
|
return &state{rate: 168, dsbyte: 0x1f, outputLen: 512}
|
|
}
|
|
func newHashShake256() hash.Hash {
|
|
return &state{rate: 136, dsbyte: 0x1f, outputLen: 512}
|
|
}
|
|
|
|
// testDigests contains functions returning hash.Hash instances
|
|
// with output-length equal to the KAT length for both SHA-3 and
|
|
// SHAKE instances.
|
|
var testDigests = map[string]func() hash.Hash{
|
|
"SHA3-224": New224,
|
|
"SHA3-256": New256,
|
|
"SHA3-384": New384,
|
|
"SHA3-512": New512,
|
|
"SHAKE128": newHashShake128,
|
|
"SHAKE256": newHashShake256,
|
|
}
|
|
|
|
// testShakes contains functions that return ShakeHash instances for
|
|
// testing the ShakeHash-specific interface.
|
|
var testShakes = map[string]func() ShakeHash{
|
|
"SHAKE128": NewShake128,
|
|
"SHAKE256": NewShake256,
|
|
}
|
|
|
|
// decodeHex converts a hex-encoded string into a raw byte string.
|
|
func decodeHex(s string) []byte {
|
|
b, err := hex.DecodeString(s)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return b
|
|
}
|
|
|
|
// structs used to marshal JSON test-cases.
|
|
type KeccakKats struct {
|
|
Kats map[string][]struct {
|
|
Digest string `json:"digest"`
|
|
Length int64 `json:"length"`
|
|
Message string `json:"message"`
|
|
}
|
|
}
|
|
|
|
func testUnalignedAndGeneric(t *testing.T, testf func(impl string)) {
|
|
xorInOrig, copyOutOrig := xorIn, copyOut
|
|
xorIn, copyOut = xorInGeneric, copyOutGeneric
|
|
testf("generic")
|
|
if xorImplementationUnaligned != "generic" {
|
|
xorIn, copyOut = xorInUnaligned, copyOutUnaligned
|
|
testf("unaligned")
|
|
}
|
|
xorIn, copyOut = xorInOrig, copyOutOrig
|
|
}
|
|
|
|
// TestKeccakKats tests the SHA-3 and Shake implementations against all the
|
|
// ShortMsgKATs from https://github.com/gvanas/KeccakCodePackage
|
|
// (The testvectors are stored in keccakKats.json.deflate due to their length.)
|
|
func TestKeccakKats(t *testing.T) {
|
|
testUnalignedAndGeneric(t, func(impl string) {
|
|
// Read the KATs.
|
|
deflated, err := os.Open(katFilename)
|
|
if err != nil {
|
|
t.Errorf("error opening %s: %s", katFilename, err)
|
|
}
|
|
file := flate.NewReader(deflated)
|
|
dec := json.NewDecoder(file)
|
|
var katSet KeccakKats
|
|
err = dec.Decode(&katSet)
|
|
if err != nil {
|
|
t.Errorf("error decoding KATs: %s", err)
|
|
}
|
|
|
|
// Do the KATs.
|
|
for functionName, kats := range katSet.Kats {
|
|
d := testDigests[functionName]()
|
|
for _, kat := range kats {
|
|
d.Reset()
|
|
in, err := hex.DecodeString(kat.Message)
|
|
if err != nil {
|
|
t.Errorf("error decoding KAT: %s", err)
|
|
}
|
|
d.Write(in[:kat.Length/8])
|
|
got := strings.ToUpper(hex.EncodeToString(d.Sum(nil)))
|
|
if got != kat.Digest {
|
|
t.Errorf("function=%s, implementation=%s, length=%d\nmessage:\n %s\ngot:\n %s\nwanted:\n %s",
|
|
functionName, impl, kat.Length, kat.Message, got, kat.Digest)
|
|
t.Logf("wanted %+v", kat)
|
|
t.FailNow()
|
|
}
|
|
continue
|
|
}
|
|
}
|
|
})
|
|
}
|
|
|
|
// TestUnalignedWrite tests that writing data in an arbitrary pattern with
|
|
// small input buffers.
|
|
func testUnalignedWrite(t *testing.T) {
|
|
testUnalignedAndGeneric(t, func(impl string) {
|
|
buf := sequentialBytes(0x10000)
|
|
for alg, df := range testDigests {
|
|
d := df()
|
|
d.Reset()
|
|
d.Write(buf)
|
|
want := d.Sum(nil)
|
|
d.Reset()
|
|
for i := 0; i < len(buf); {
|
|
// Cycle through offsets which make a 137 byte sequence.
|
|
// Because 137 is prime this sequence should exercise all corner cases.
|
|
offsets := [17]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 1}
|
|
for _, j := range offsets {
|
|
if v := len(buf) - i; v < j {
|
|
j = v
|
|
}
|
|
d.Write(buf[i : i+j])
|
|
i += j
|
|
}
|
|
}
|
|
got := d.Sum(nil)
|
|
if !bytes.Equal(got, want) {
|
|
t.Errorf("Unaligned writes, implementation=%s, alg=%s\ngot %q, want %q", impl, alg, got, want)
|
|
}
|
|
}
|
|
})
|
|
}
|
|
|
|
// TestAppend checks that appending works when reallocation is necessary.
|
|
func TestAppend(t *testing.T) {
|
|
testUnalignedAndGeneric(t, func(impl string) {
|
|
d := New224()
|
|
|
|
for capacity := 2; capacity <= 66; capacity += 64 {
|
|
// The first time around the loop, Sum will have to reallocate.
|
|
// The second time, it will not.
|
|
buf := make([]byte, 2, capacity)
|
|
d.Reset()
|
|
d.Write([]byte{0xcc})
|
|
buf = d.Sum(buf)
|
|
expected := "0000DF70ADC49B2E76EEE3A6931B93FA41841C3AF2CDF5B32A18B5478C39"
|
|
if got := strings.ToUpper(hex.EncodeToString(buf)); got != expected {
|
|
t.Errorf("got %s, want %s", got, expected)
|
|
}
|
|
}
|
|
})
|
|
}
|
|
|
|
// TestAppendNoRealloc tests that appending works when no reallocation is necessary.
|
|
func TestAppendNoRealloc(t *testing.T) {
|
|
testUnalignedAndGeneric(t, func(impl string) {
|
|
buf := make([]byte, 1, 200)
|
|
d := New224()
|
|
d.Write([]byte{0xcc})
|
|
buf = d.Sum(buf)
|
|
expected := "00DF70ADC49B2E76EEE3A6931B93FA41841C3AF2CDF5B32A18B5478C39"
|
|
if got := strings.ToUpper(hex.EncodeToString(buf)); got != expected {
|
|
t.Errorf("%s: got %s, want %s", impl, got, expected)
|
|
}
|
|
})
|
|
}
|
|
|
|
// TestSqueezing checks that squeezing the full output a single time produces
|
|
// the same output as repeatedly squeezing the instance.
|
|
func TestSqueezing(t *testing.T) {
|
|
testUnalignedAndGeneric(t, func(impl string) {
|
|
for functionName, newShakeHash := range testShakes {
|
|
d0 := newShakeHash()
|
|
d0.Write([]byte(testString))
|
|
ref := make([]byte, 32)
|
|
d0.Read(ref)
|
|
|
|
d1 := newShakeHash()
|
|
d1.Write([]byte(testString))
|
|
var multiple []byte
|
|
for _ = range ref {
|
|
one := make([]byte, 1)
|
|
d1.Read(one)
|
|
multiple = append(multiple, one...)
|
|
}
|
|
if !bytes.Equal(ref, multiple) {
|
|
t.Errorf("%s (%s): squeezing %d bytes one at a time failed", functionName, impl, len(ref))
|
|
}
|
|
}
|
|
})
|
|
}
|
|
|
|
// sequentialBytes produces a buffer of size consecutive bytes 0x00, 0x01, ..., used for testing.
|
|
func sequentialBytes(size int) []byte {
|
|
result := make([]byte, size)
|
|
for i := range result {
|
|
result[i] = byte(i)
|
|
}
|
|
return result
|
|
}
|
|
|
|
// BenchmarkPermutationFunction measures the speed of the permutation function
|
|
// with no input data.
|
|
func BenchmarkPermutationFunction(b *testing.B) {
|
|
b.SetBytes(int64(200))
|
|
var lanes [25]uint64
|
|
for i := 0; i < b.N; i++ {
|
|
keccakF1600(&lanes)
|
|
}
|
|
}
|
|
|
|
// benchmarkHash tests the speed to hash num buffers of buflen each.
|
|
func benchmarkHash(b *testing.B, h hash.Hash, size, num int) {
|
|
b.StopTimer()
|
|
h.Reset()
|
|
data := sequentialBytes(size)
|
|
b.SetBytes(int64(size * num))
|
|
b.StartTimer()
|
|
|
|
var state []byte
|
|
for i := 0; i < b.N; i++ {
|
|
for j := 0; j < num; j++ {
|
|
h.Write(data)
|
|
}
|
|
state = h.Sum(state[:0])
|
|
}
|
|
b.StopTimer()
|
|
h.Reset()
|
|
}
|
|
|
|
// benchmarkShake is specialized to the Shake instances, which don't
|
|
// require a copy on reading output.
|
|
func benchmarkShake(b *testing.B, h ShakeHash, size, num int) {
|
|
b.StopTimer()
|
|
h.Reset()
|
|
data := sequentialBytes(size)
|
|
d := make([]byte, 32)
|
|
|
|
b.SetBytes(int64(size * num))
|
|
b.StartTimer()
|
|
|
|
for i := 0; i < b.N; i++ {
|
|
h.Reset()
|
|
for j := 0; j < num; j++ {
|
|
h.Write(data)
|
|
}
|
|
h.Read(d)
|
|
}
|
|
}
|
|
|
|
func BenchmarkSha3_512_MTU(b *testing.B) { benchmarkHash(b, New512(), 1350, 1) }
|
|
func BenchmarkSha3_384_MTU(b *testing.B) { benchmarkHash(b, New384(), 1350, 1) }
|
|
func BenchmarkSha3_256_MTU(b *testing.B) { benchmarkHash(b, New256(), 1350, 1) }
|
|
func BenchmarkSha3_224_MTU(b *testing.B) { benchmarkHash(b, New224(), 1350, 1) }
|
|
|
|
func BenchmarkShake128_MTU(b *testing.B) { benchmarkShake(b, NewShake128(), 1350, 1) }
|
|
func BenchmarkShake256_MTU(b *testing.B) { benchmarkShake(b, NewShake256(), 1350, 1) }
|
|
func BenchmarkShake256_16x(b *testing.B) { benchmarkShake(b, NewShake256(), 16, 1024) }
|
|
func BenchmarkShake256_1MiB(b *testing.B) { benchmarkShake(b, NewShake256(), 1024, 1024) }
|
|
|
|
func BenchmarkSha3_512_1MiB(b *testing.B) { benchmarkHash(b, New512(), 1024, 1024) }
|
|
|
|
func Example_sum() {
|
|
buf := []byte("some data to hash")
|
|
// A hash needs to be 64 bytes long to have 256-bit collision resistance.
|
|
h := make([]byte, 64)
|
|
// Compute a 64-byte hash of buf and put it in h.
|
|
ShakeSum256(h, buf)
|
|
}
|
|
|
|
func Example_mac() {
|
|
k := []byte("this is a secret key; you should generate a strong random key that's at least 32 bytes long")
|
|
buf := []byte("and this is some data to authenticate")
|
|
// A MAC with 32 bytes of output has 256-bit security strength -- if you use at least a 32-byte-long key.
|
|
h := make([]byte, 32)
|
|
d := NewShake256()
|
|
// Write the key into the hash.
|
|
d.Write(k)
|
|
// Now write the data.
|
|
d.Write(buf)
|
|
// Read 32 bytes of output from the hash into h.
|
|
d.Read(h)
|
|
}
|