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// Copyright 2024 OpenPubkey
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0
package gq
import (
"crypto/sha1"
"encoding/hex"
"math/big"
"testing"
"filippo.io/bigmod"
"github.com/openpubkey/openpubkey/util"
"github.com/stretchr/testify/require"
)
// The test vector specifies hex values for each of the signature scheme's data
// elements, as well as the expected content of the signature
const nHex = "D37B4534B4B788AE23E1E4719A395BBFF8A98EDBDCB3992306C513AAA95E9A335221998C20CD1344CA50C59193B84437FFC1E91E5EBEF9587615875102A7E83624DA4F72CAF28D1DF429652346D6F203E17C65288790F6F6D97835216B49F5932728A967D6D36561621FF38DFC185DFA5A160962E7C8E087CE90897B16EA4EA1"
const vHex = "010000000000000000000D"
const qHex = "3BED38CEBB1219BC068774E0E2655CDEF67FE547BCF2D9FA9FE167B1E63B2F101A1483D38A8F24EDE365A3E44F4F10ADECEA7B30D042C14C162477B8184AE6CFAA78441B1FDFB0B223ABCD528B61F313D859FCF9C26FCAF9E4D9DA9BA83E9D2FDA041E8CCBF90056C31D654B546C1A7F6729A8DD8E68512F39E3B6F07959CE61"
const idHex = "416C657820416D706C65"
const gHex = "3E641A22D0D0747D4ACC71884D3DFF2B2ADFDC1703B5A74EFD8333AB8C4377BB2A9B48E707F73409ABFBCD2DED69F52B16A145CE062FE6BD712C1952110DFB2316C5F3F321922ED375A4DEB8C41FA79BCAD86B0EA0D8FF02C9D0D5911BFF1E87DBCF073F71F18C08EB944AE84883A1E13FB1DEA123B5B1EFEA2A92635BD5D88F"
const rHex = "487CDB0041BEED0323FDD3DEC8542584FA0E6CB990FAD5878DB34E9BEDDC95B65D22790C108E218407ED7F7D686657BAB5A28EF81C2E24985B56E37D9934E195A38A835CC02CEE8EBA2F56C87663E332976F5A3720DACA120BCD3DF0AEF6FD78582EBFCEE6D05E06172A871EAB0E8F5FC22DDB600F541B87CF8E147358374406"
const sigHex = "99394F1D15924C0374CF80C7274CD9F232903A6423D9327156F69743EAEF03E1EFEDFDA8474C97F6570D9EF53C6CE2AE2BA68D01FFF9AA82068214BCD775B95CC297DDC38A63741AB3166B58275E0FB728D26DB18A2C3F14B621CF3863F8648B3149FE896348BE73D37E2F06E6E26C84C044984C09C658300B58EC2383E3B0A1F1390D62B772A69F37B5"
var mISO = []byte("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopqo")
var sigISO []byte
var qISO []byte
var idISO []byte
var svISO signerVerifier
// Test our signer using the values specified in ISO/IEC 14888-2:2008
func TestSignerISO(t *testing.T) {
// The test vector specifies that h(W||M) use SHA-1
h := hash
hash = sha1Hash
// Instead of a true random value for r, use the value from the test vector
rn := randomNumbers
randomNumbers = hardcodedRandomISO
// restore default function definitions after the test
defer func() {
hash = h
randomNumbers = rn
}()
encodedSig, err := svISO.Sign(qISO, mISO)
require.NoError(t, err)
sig, err := util.Base64DecodeForJWT(encodedSig)
require.NoError(t, err)
require.Equal(t, sig, sigISO, "Signature does not match expected value")
}
// Test our verifier using the values specified in ISO/IEC 14888-2:2008
func TestVerifierISO(t *testing.T) {
// The test vector specifies that h(W||M) use SHA-1
h := hash
hash = sha1Hash
// The test vector formats Id with PSS. Instead of implementing this
// encoding ourselves, we hardcode the value for G given in the standard
ep := encodePKCS1v15
encodePKCS1v15 = pssEncodedId
// restore default function definitions after the test
defer func() {
hash = h
encodePKCS1v15 = ep
}()
encodedSigISO := util.Base64EncodeForJWT(sigISO)
ok := svISO.Verify(encodedSigISO, idISO, mISO)
require.True(t, ok, "Signature verification failed")
}
func init() {
vBytes, err := hex.DecodeString(vHex)
if err != nil {
panic(err)
}
v := new(big.Int).SetBytes(vBytes)
nBytes, err := hex.DecodeString(nHex)
if err != nil {
panic(err)
}
n, err := bigmod.NewModulusFromBig(new(big.Int).SetBytes(nBytes))
if err != nil {
panic(err)
}
svISO = signerVerifier{
n: n,
v: v,
nBytes: 128,
vBytes: 10,
t: 1,
}
sigISO, err = hex.DecodeString(sigHex)
if err != nil {
panic(err)
}
qISO, err = hex.DecodeString(qHex)
if err != nil {
panic(err)
}
idISO, err = hex.DecodeString(idHex)
if err != nil {
panic(err)
}
}
var pssEncodedId = func(k int, data []byte) []byte {
em, _ := hex.DecodeString(gHex)
return em
}
var hardcodedRandomISO = func(t int, n *bigmod.Modulus) ([]*bigmod.Nat, error) {
ys := make([]*bigmod.Nat, 1)
rRaw, err := hex.DecodeString(rHex)
if err != nil {
return nil, err
}
r, err := bigmod.NewNat().SetBytes(rRaw, n)
if err != nil {
return nil, err
}
ys[0] = r
return ys, nil
}
var sha1Hash = func(byteCount int, data ...[]byte) ([]byte, error) {
hash := sha1.New()
for _, d := range data {
hash.Write(d)
}
return hash.Sum(nil)[:byteCount], nil
}
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