src/crypto/rsa/pss_test.go - go - Git at Google

 // Copyright 2013 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 rsa

 import (
 	"bufio"
 	"bytes"
 	"compress/bzip2"
 	"crypto"
 	"crypto/rand"
 	"crypto/sha1"
 	_ "crypto/sha256"
 	"encoding/hex"
 	"math/big"
 	"os"
 	"strconv"
 	"strings"
 	"testing"
 )

 func TestEMSAPSS(t *testing.T) {
 	// Test vector in file pss-int.txt from: ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip
 	msg := []byte{
 		0x85, 0x9e, 0xef, 0x2f, 0xd7, 0x8a, 0xca, 0x00, 0x30, 0x8b,
 		0xdc, 0x47, 0x11, 0x93, 0xbf, 0x55, 0xbf, 0x9d, 0x78, 0xdb,
 		0x8f, 0x8a, 0x67, 0x2b, 0x48, 0x46, 0x34, 0xf3, 0xc9, 0xc2,
 		0x6e, 0x64, 0x78, 0xae, 0x10, 0x26, 0x0f, 0xe0, 0xdd, 0x8c,
 		0x08, 0x2e, 0x53, 0xa5, 0x29, 0x3a, 0xf2, 0x17, 0x3c, 0xd5,
 		0x0c, 0x6d, 0x5d, 0x35, 0x4f, 0xeb, 0xf7, 0x8b, 0x26, 0x02,
 		0x1c, 0x25, 0xc0, 0x27, 0x12, 0xe7, 0x8c, 0xd4, 0x69, 0x4c,
 		0x9f, 0x46, 0x97, 0x77, 0xe4, 0x51, 0xe7, 0xf8, 0xe9, 0xe0,
 		0x4c, 0xd3, 0x73, 0x9c, 0x6b, 0xbf, 0xed, 0xae, 0x48, 0x7f,
 		0xb5, 0x56, 0x44, 0xe9, 0xca, 0x74, 0xff, 0x77, 0xa5, 0x3c,
 		0xb7, 0x29, 0x80, 0x2f, 0x6e, 0xd4, 0xa5, 0xff, 0xa8, 0xba,
 		0x15, 0x98, 0x90, 0xfc,
 	}
 	salt := []byte{
 		0xe3, 0xb5, 0xd5, 0xd0, 0x02, 0xc1, 0xbc, 0xe5, 0x0c, 0x2b,
 		0x65, 0xef, 0x88, 0xa1, 0x88, 0xd8, 0x3b, 0xce, 0x7e, 0x61,
 	}
 	expected := []byte{
 		0x66, 0xe4, 0x67, 0x2e, 0x83, 0x6a, 0xd1, 0x21, 0xba, 0x24,
 		0x4b, 0xed, 0x65, 0x76, 0xb8, 0x67, 0xd9, 0xa4, 0x47, 0xc2,
 		0x8a, 0x6e, 0x66, 0xa5, 0xb8, 0x7d, 0xee, 0x7f, 0xbc, 0x7e,
 		0x65, 0xaf, 0x50, 0x57, 0xf8, 0x6f, 0xae, 0x89, 0x84, 0xd9,
 		0xba, 0x7f, 0x96, 0x9a, 0xd6, 0xfe, 0x02, 0xa4, 0xd7, 0x5f,
 		0x74, 0x45, 0xfe, 0xfd, 0xd8, 0x5b, 0x6d, 0x3a, 0x47, 0x7c,
 		0x28, 0xd2, 0x4b, 0xa1, 0xe3, 0x75, 0x6f, 0x79, 0x2d, 0xd1,
 		0xdc, 0xe8, 0xca, 0x94, 0x44, 0x0e, 0xcb, 0x52, 0x79, 0xec,
 		0xd3, 0x18, 0x3a, 0x31, 0x1f, 0xc8, 0x96, 0xda, 0x1c, 0xb3,
 		0x93, 0x11, 0xaf, 0x37, 0xea, 0x4a, 0x75, 0xe2, 0x4b, 0xdb,
 		0xfd, 0x5c, 0x1d, 0xa0, 0xde, 0x7c, 0xec, 0xdf, 0x1a, 0x89,
 		0x6f, 0x9d, 0x8b, 0xc8, 0x16, 0xd9, 0x7c, 0xd7, 0xa2, 0xc4,
 		0x3b, 0xad, 0x54, 0x6f, 0xbe, 0x8c, 0xfe, 0xbc,
 	}

 	hash := sha1.New()
 	hash.Write(msg)
 	hashed := hash.Sum(nil)

 	encoded, err := emsaPSSEncode(hashed, 1023, salt, sha1.New())
 	if err != nil {
 		t.Errorf("Error from emsaPSSEncode: %s\n", err)
 	}
 	if !bytes.Equal(encoded, expected) {
 		t.Errorf("Bad encoding. got %x, want %x", encoded, expected)
 	}

 	if err = emsaPSSVerify(hashed, encoded, 1023, len(salt), sha1.New()); err != nil {
 		t.Errorf("Bad verification: %s", err)
 	}
 }

 // TestPSSGolden tests all the test vectors in pss-vect.txt from
 // ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip
 func TestPSSGolden(t *testing.T) {
 	inFile, err := os.Open("testdata/pss-vect.txt.bz2")
 	if err != nil {
 		t.Fatalf("Failed to open input file: %s", err)
 	}
 	defer inFile.Close()

 	// The pss-vect.txt file contains RSA keys and then a series of
 	// signatures. A goroutine is used to preprocess the input by merging
 	// lines, removing spaces in hex values and identifying the start of
 	// new keys and signature blocks.
 	const newKeyMarker = "START NEW KEY"
 	const newSignatureMarker = "START NEW SIGNATURE"

 	values := make(chan string)

 	go func() {
 		defer close(values)
 		scanner := bufio.NewScanner(bzip2.NewReader(inFile))
 		var partialValue string
 		lastWasValue := true

 		for scanner.Scan() {
 			line := scanner.Text()
 			switch {
 			case len(line) == 0:
 				if len(partialValue) > 0 {
 					values <- strings.ReplaceAll(partialValue, " ", "")
 					partialValue = ""
 					lastWasValue = true
 				}
 				continue
 			case strings.HasPrefix(line, "# ======") && lastWasValue:
 				values <- newKeyMarker
 				lastWasValue = false
 			case strings.HasPrefix(line, "# ------") && lastWasValue:
 				values <- newSignatureMarker
 				lastWasValue = false
 			case strings.HasPrefix(line, "#"):
 				continue
 			default:
 				partialValue += line
 			}
 		}
 		if err := scanner.Err(); err != nil {
 			panic(err)
 		}
 	}()

 	var key *PublicKey
 	var hashed []byte
 	hash := crypto.SHA1
 	h := hash.New()
 	opts := &PSSOptions{
 		SaltLength: PSSSaltLengthEqualsHash,
 	}

 	for marker := range values {
 		switch marker {
 		case newKeyMarker:
 			key = new(PublicKey)
 			nHex, ok := <-values
 			if !ok {
 				continue
 			}
 			key.N = bigFromHex(nHex)
 			key.E = intFromHex(<-values)
 			// We don't care for d, p, q, dP, dQ or qInv.
 			for i := 0; i < 6; i++ {
 				<-values
 			}
 		case newSignatureMarker:
 			msg := fromHex(<-values)
 			<-values // skip salt
 			sig := fromHex(<-values)

 			h.Reset()
 			h.Write(msg)
 			hashed = h.Sum(hashed[:0])

 			if err := VerifyPSS(key, hash, hashed, sig, opts); err != nil {
 				t.Error(err)
 			}
 		default:
 			t.Fatalf("unknown marker: " + marker)
 		}
 	}
 }

 // TestPSSOpenSSL ensures that we can verify a PSS signature from OpenSSL with
 // the default options. OpenSSL sets the salt length to be maximal.
 func TestPSSOpenSSL(t *testing.T) {
 	hash := crypto.SHA256
 	h := hash.New()
 	h.Write([]byte("testing"))
 	hashed := h.Sum(nil)

 	// Generated with `echo -n testing | openssl dgst -sign key.pem -sigopt rsa_padding_mode:pss -sha256 > sig`
 	sig := []byte{
 		0x95, 0x59, 0x6f, 0xd3, 0x10, 0xa2, 0xe7, 0xa2, 0x92, 0x9d,
 		0x4a, 0x07, 0x2e, 0x2b, 0x27, 0xcc, 0x06, 0xc2, 0x87, 0x2c,
 		0x52, 0xf0, 0x4a, 0xcc, 0x05, 0x94, 0xf2, 0xc3, 0x2e, 0x20,
 		0xd7, 0x3e, 0x66, 0x62, 0xb5, 0x95, 0x2b, 0xa3, 0x93, 0x9a,
 		0x66, 0x64, 0x25, 0xe0, 0x74, 0x66, 0x8c, 0x3e, 0x92, 0xeb,
 		0xc6, 0xe6, 0xc0, 0x44, 0xf3, 0xb4, 0xb4, 0x2e, 0x8c, 0x66,
 		0x0a, 0x37, 0x9c, 0x69,
 	}

 	if err := VerifyPSS(&rsaPrivateKey.PublicKey, hash, hashed, sig, nil); err != nil {
 		t.Error(err)
 	}
 }

 func TestPSSNilOpts(t *testing.T) {
 	hash := crypto.SHA256
 	h := hash.New()
 	h.Write([]byte("testing"))
 	hashed := h.Sum(nil)

 	SignPSS(rand.Reader, rsaPrivateKey, hash, hashed, nil)
 }

 func TestPSSSigning(t *testing.T) {
 	var saltLengthCombinations = []struct {
 		signSaltLength, verifySaltLength int
 		good                             bool
 	}{
 		{PSSSaltLengthAuto, PSSSaltLengthAuto, true},
 		{PSSSaltLengthEqualsHash, PSSSaltLengthAuto, true},
 		{PSSSaltLengthEqualsHash, PSSSaltLengthEqualsHash, true},
 		{PSSSaltLengthEqualsHash, 8, false},
 		{PSSSaltLengthAuto, PSSSaltLengthEqualsHash, false},
 		{8, 8, true},
 	}

 	hash := crypto.SHA1
 	h := hash.New()
 	h.Write([]byte("testing"))
 	hashed := h.Sum(nil)
 	var opts PSSOptions

 	for i, test := range saltLengthCombinations {
 		opts.SaltLength = test.signSaltLength
 		sig, err := SignPSS(rand.Reader, rsaPrivateKey, hash, hashed, &opts)
 		if err != nil {
 			t.Errorf("#%d: error while signing: %s", i, err)
 			continue
 		}

 		opts.SaltLength = test.verifySaltLength
 		err = VerifyPSS(&rsaPrivateKey.PublicKey, hash, hashed, sig, &opts)
 		if (err == nil) != test.good {
 			t.Errorf("#%d: bad result, wanted: %t, got: %s", i, test.good, err)
 		}
 	}
 }

 func bigFromHex(hex string) *big.Int {
 	n, ok := new(big.Int).SetString(hex, 16)
 	if !ok {
 		panic("bad hex: " + hex)
 	}
 	return n
 }

 func intFromHex(hex string) int {
 	i, err := strconv.ParseInt(hex, 16, 32)
 	if err != nil {
 		panic(err)
 	}
 	return int(i)
 }

 func fromHex(hexStr string) []byte {
 	s, err := hex.DecodeString(hexStr)
 	if err != nil {
 		panic(err)
 	}
 	return s
 }
	// Copyright 2013 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 rsa

	import (
	"bufio"
	"bytes"
	"compress/bzip2"
	"crypto"
	"crypto/rand"
	"crypto/sha1"
	_ "crypto/sha256"
	"encoding/hex"
	"math/big"
	"os"
	"strconv"
	"strings"
	"testing"
	)

	func TestEMSAPSS(t *testing.T) {
	// Test vector in file pss-int.txt from: ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip
	msg := []byte{
	0x85, 0x9e, 0xef, 0x2f, 0xd7, 0x8a, 0xca, 0x00, 0x30, 0x8b,
	0xdc, 0x47, 0x11, 0x93, 0xbf, 0x55, 0xbf, 0x9d, 0x78, 0xdb,
	0x8f, 0x8a, 0x67, 0x2b, 0x48, 0x46, 0x34, 0xf3, 0xc9, 0xc2,
	0x6e, 0x64, 0x78, 0xae, 0x10, 0x26, 0x0f, 0xe0, 0xdd, 0x8c,
	0x08, 0x2e, 0x53, 0xa5, 0x29, 0x3a, 0xf2, 0x17, 0x3c, 0xd5,
	0x0c, 0x6d, 0x5d, 0x35, 0x4f, 0xeb, 0xf7, 0x8b, 0x26, 0x02,
	0x1c, 0x25, 0xc0, 0x27, 0x12, 0xe7, 0x8c, 0xd4, 0x69, 0x4c,
	0x9f, 0x46, 0x97, 0x77, 0xe4, 0x51, 0xe7, 0xf8, 0xe9, 0xe0,
	0x4c, 0xd3, 0x73, 0x9c, 0x6b, 0xbf, 0xed, 0xae, 0x48, 0x7f,
	0xb5, 0x56, 0x44, 0xe9, 0xca, 0x74, 0xff, 0x77, 0xa5, 0x3c,
	0xb7, 0x29, 0x80, 0x2f, 0x6e, 0xd4, 0xa5, 0xff, 0xa8, 0xba,
	0x15, 0x98, 0x90, 0xfc,
	}
	salt := []byte{
	0xe3, 0xb5, 0xd5, 0xd0, 0x02, 0xc1, 0xbc, 0xe5, 0x0c, 0x2b,
	0x65, 0xef, 0x88, 0xa1, 0x88, 0xd8, 0x3b, 0xce, 0x7e, 0x61,
	}
	expected := []byte{
	0x66, 0xe4, 0x67, 0x2e, 0x83, 0x6a, 0xd1, 0x21, 0xba, 0x24,
	0x4b, 0xed, 0x65, 0x76, 0xb8, 0x67, 0xd9, 0xa4, 0x47, 0xc2,
	0x8a, 0x6e, 0x66, 0xa5, 0xb8, 0x7d, 0xee, 0x7f, 0xbc, 0x7e,
	0x65, 0xaf, 0x50, 0x57, 0xf8, 0x6f, 0xae, 0x89, 0x84, 0xd9,
	0xba, 0x7f, 0x96, 0x9a, 0xd6, 0xfe, 0x02, 0xa4, 0xd7, 0x5f,
	0x74, 0x45, 0xfe, 0xfd, 0xd8, 0x5b, 0x6d, 0x3a, 0x47, 0x7c,
	0x28, 0xd2, 0x4b, 0xa1, 0xe3, 0x75, 0x6f, 0x79, 0x2d, 0xd1,
	0xdc, 0xe8, 0xca, 0x94, 0x44, 0x0e, 0xcb, 0x52, 0x79, 0xec,
	0xd3, 0x18, 0x3a, 0x31, 0x1f, 0xc8, 0x96, 0xda, 0x1c, 0xb3,
	0x93, 0x11, 0xaf, 0x37, 0xea, 0x4a, 0x75, 0xe2, 0x4b, 0xdb,
	0xfd, 0x5c, 0x1d, 0xa0, 0xde, 0x7c, 0xec, 0xdf, 0x1a, 0x89,
	0x6f, 0x9d, 0x8b, 0xc8, 0x16, 0xd9, 0x7c, 0xd7, 0xa2, 0xc4,
	0x3b, 0xad, 0x54, 0x6f, 0xbe, 0x8c, 0xfe, 0xbc,
	}

	hash := sha1.New()
	hash.Write(msg)
	hashed := hash.Sum(nil)

	encoded, err := emsaPSSEncode(hashed, 1023, salt, sha1.New())
	if err != nil {
	t.Errorf("Error from emsaPSSEncode: %s\n", err)
	}
	if !bytes.Equal(encoded, expected) {
	t.Errorf("Bad encoding. got %x, want %x", encoded, expected)
	}

	if err = emsaPSSVerify(hashed, encoded, 1023, len(salt), sha1.New()); err != nil {
	t.Errorf("Bad verification: %s", err)
	}
	}

	// TestPSSGolden tests all the test vectors in pss-vect.txt from
	// ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip
	func TestPSSGolden(t *testing.T) {
	inFile, err := os.Open("testdata/pss-vect.txt.bz2")
	if err != nil {
	t.Fatalf("Failed to open input file: %s", err)
	}
	defer inFile.Close()

	// The pss-vect.txt file contains RSA keys and then a series of
	// signatures. A goroutine is used to preprocess the input by merging
	// lines, removing spaces in hex values and identifying the start of
	// new keys and signature blocks.
	const newKeyMarker = "START NEW KEY"
	const newSignatureMarker = "START NEW SIGNATURE"

	values := make(chan string)

	go func() {
	defer close(values)
	scanner := bufio.NewScanner(bzip2.NewReader(inFile))
	var partialValue string
	lastWasValue := true

	for scanner.Scan() {
	line := scanner.Text()
	switch {
	case len(line) == 0:
	if len(partialValue) > 0 {
	values <- strings.ReplaceAll(partialValue, " ", "")
	partialValue = ""
	lastWasValue = true
	}
	continue
	case strings.HasPrefix(line, "# ======") && lastWasValue:
	values <- newKeyMarker
	lastWasValue = false
	case strings.HasPrefix(line, "# ------") && lastWasValue:
	values <- newSignatureMarker
	lastWasValue = false
	case strings.HasPrefix(line, "#"):
	continue
	default:
	partialValue += line
	}
	}
	if err := scanner.Err(); err != nil {
	panic(err)
	}
	}()

	var key *PublicKey
	var hashed []byte
	hash := crypto.SHA1
	h := hash.New()
	opts := &PSSOptions{
	SaltLength: PSSSaltLengthEqualsHash,
	}

	for marker := range values {
	switch marker {
	case newKeyMarker:
	key = new(PublicKey)
	nHex, ok := <-values
	if !ok {
	continue
	}
	key.N = bigFromHex(nHex)
	key.E = intFromHex(<-values)
	// We don't care for d, p, q, dP, dQ or qInv.
	for i := 0; i < 6; i++ {
	<-values
	}
	case newSignatureMarker:
	msg := fromHex(<-values)
	<-values // skip salt
	sig := fromHex(<-values)

	h.Reset()
	h.Write(msg)
	hashed = h.Sum(hashed[:0])

	if err := VerifyPSS(key, hash, hashed, sig, opts); err != nil {
	t.Error(err)
	}
	default:
	t.Fatalf("unknown marker: " + marker)
	}
	}
	}

	// TestPSSOpenSSL ensures that we can verify a PSS signature from OpenSSL with
	// the default options. OpenSSL sets the salt length to be maximal.
	func TestPSSOpenSSL(t *testing.T) {
	hash := crypto.SHA256
	h := hash.New()
	h.Write([]byte("testing"))
	hashed := h.Sum(nil)

	// Generated with `echo -n testing \| openssl dgst -sign key.pem -sigopt rsa_padding_mode:pss -sha256 > sig`
	sig := []byte{
	0x95, 0x59, 0x6f, 0xd3, 0x10, 0xa2, 0xe7, 0xa2, 0x92, 0x9d,
	0x4a, 0x07, 0x2e, 0x2b, 0x27, 0xcc, 0x06, 0xc2, 0x87, 0x2c,
	0x52, 0xf0, 0x4a, 0xcc, 0x05, 0x94, 0xf2, 0xc3, 0x2e, 0x20,
	0xd7, 0x3e, 0x66, 0x62, 0xb5, 0x95, 0x2b, 0xa3, 0x93, 0x9a,
	0x66, 0x64, 0x25, 0xe0, 0x74, 0x66, 0x8c, 0x3e, 0x92, 0xeb,
	0xc6, 0xe6, 0xc0, 0x44, 0xf3, 0xb4, 0xb4, 0x2e, 0x8c, 0x66,
	0x0a, 0x37, 0x9c, 0x69,
	}

	if err := VerifyPSS(&rsaPrivateKey.PublicKey, hash, hashed, sig, nil); err != nil {
	t.Error(err)
	}
	}

	func TestPSSNilOpts(t *testing.T) {
	hash := crypto.SHA256
	h := hash.New()
	h.Write([]byte("testing"))
	hashed := h.Sum(nil)

	SignPSS(rand.Reader, rsaPrivateKey, hash, hashed, nil)
	}

	func TestPSSSigning(t *testing.T) {
	var saltLengthCombinations = []struct {
	signSaltLength, verifySaltLength int
	good bool
	}{
	{PSSSaltLengthAuto, PSSSaltLengthAuto, true},
	{PSSSaltLengthEqualsHash, PSSSaltLengthAuto, true},
	{PSSSaltLengthEqualsHash, PSSSaltLengthEqualsHash, true},
	{PSSSaltLengthEqualsHash, 8, false},
	{PSSSaltLengthAuto, PSSSaltLengthEqualsHash, false},
	{8, 8, true},
	}

	hash := crypto.SHA1
	h := hash.New()
	h.Write([]byte("testing"))
	hashed := h.Sum(nil)
	var opts PSSOptions

	for i, test := range saltLengthCombinations {
	opts.SaltLength = test.signSaltLength
	sig, err := SignPSS(rand.Reader, rsaPrivateKey, hash, hashed, &opts)
	if err != nil {
	t.Errorf("#%d: error while signing: %s", i, err)
	continue
	}

	opts.SaltLength = test.verifySaltLength
	err = VerifyPSS(&rsaPrivateKey.PublicKey, hash, hashed, sig, &opts)
	if (err == nil) != test.good {
	t.Errorf("#%d: bad result, wanted: %t, got: %s", i, test.good, err)
	}
	}
	}

	func bigFromHex(hex string) *big.Int {
	n, ok := new(big.Int).SetString(hex, 16)
	if !ok {
	panic("bad hex: " + hex)
	}
	return n
	}

	func intFromHex(hex string) int {
	i, err := strconv.ParseInt(hex, 16, 32)
	if err != nil {
	panic(err)
	}
	return int(i)
	}

	func fromHex(hexStr string) []byte {
	s, err := hex.DecodeString(hexStr)
	if err != nil {
	panic(err)
	}
	return s
	}