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// Copyright (C) 2019-2021 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package crypto
import (
"testing"
)
func randID() OneTimeSignatureIdentifier {
return OneTimeSignatureIdentifier{
Batch: RandUint64() % 256,
// Avoid generating the last few offsets (in a batch size of 256), so we can increment correctly
Offset: RandUint64() % 250,
}
}
func TestOneTimeSignVerifyNewStyle(t *testing.T) {
c := GenerateOneTimeSignatureSecrets(0, 1000)
c2 := GenerateOneTimeSignatureSecrets(0, 1000)
testOneTimeSignVerifyNewStyle(t, c, c2)
}
func testOneTimeSignVerifyNewStyle(t *testing.T, c *OneTimeSignatureSecrets, c2 *OneTimeSignatureSecrets) {
id := randID()
s := randString()
s2 := randString()
sig := c.Sign(id, s)
if !c.Verify(id, s, sig) {
t.Errorf("correct signature failed to verify (ephemeral)")
}
if c.Verify(id, s2, sig) {
t.Errorf("signature verifies on wrong message")
}
sig2 := c2.Sign(id, s)
if c.Verify(id, s, sig2) {
t.Errorf("wrong master key incorrectly verified (ephemeral)")
}
otherID := randID()
if c.Verify(otherID, s, sig) {
t.Errorf("signature verifies for wrong ID")
}
nextOffsetID := id
nextOffsetID.Offset++
if c.Verify(nextOffsetID, s, sig) {
t.Errorf("signature verifies after changing offset")
}
c.DeleteBeforeFineGrained(nextOffsetID, 256)
sigAfterDelete := c.Sign(id, s)
if c.Verify(id, s, sigAfterDelete) { // TODO(adam): Previously, this call to Verify was verifying old-style coarse-grained one-time signatures. Now it's verifying new-style fine-grained one-time signatures. Is this correct?
t.Errorf("signature verifies after delete offset")
}
sigNextAfterDelete := c.Sign(nextOffsetID, s)
if !c.Verify(nextOffsetID, s, sigNextAfterDelete) {
t.Errorf("signature fails to verify after deleting up to this offset")
}
nextOffsetID.Offset++
sigNext2AfterDelete := c.Sign(nextOffsetID, s)
if !c.Verify(nextOffsetID, s, sigNext2AfterDelete) {
t.Errorf("signature fails to verify after deleting up to previous offset")
}
nextBatchID := id
nextBatchID.Batch++
nextBatchOffsetID := nextBatchID
nextBatchOffsetID.Offset++
c.DeleteBeforeFineGrained(nextBatchOffsetID, 256)
sigAfterDelete = c.Sign(nextBatchID, s)
if c.Verify(nextBatchID, s, sigAfterDelete) {
t.Errorf("signature verifies after delete")
}
sigNextAfterDelete = c.Sign(nextBatchOffsetID, s)
if !c.Verify(nextBatchOffsetID, s, sigNextAfterDelete) {
t.Errorf("signature fails to verify after delete up to this offset")
}
nextBatchOffsetID.Offset++
sigNext2AfterDelete = c.Sign(nextBatchOffsetID, s)
if !c.Verify(nextBatchOffsetID, s, sigNext2AfterDelete) {
t.Errorf("signature fails to verify after delete up to previous offset")
}
// Jump by two batches
bigJumpID := nextBatchOffsetID
bigJumpID.Batch += 10
c.DeleteBeforeFineGrained(bigJumpID, 256)
preBigJumpID := bigJumpID
preBigJumpID.Batch--
if c.Verify(preBigJumpID, s, c.Sign(preBigJumpID, s)) {
t.Errorf("preBigJumpID verifies")
}
preBigJumpID.Batch++
preBigJumpID.Offset--
if c.Verify(preBigJumpID, s, c.Sign(preBigJumpID, s)) {
t.Errorf("preBigJumpID verifies")
}
if !c.Verify(bigJumpID, s, c.Sign(bigJumpID, s)) {
t.Errorf("bigJumpID does not verify")
}
bigJumpID.Offset++
if !c.Verify(bigJumpID, s, c.Sign(bigJumpID, s)) {
t.Errorf("bigJumpID.Offset++ does not verify")
}
bigJumpID.Batch++
if !c.Verify(bigJumpID, s, c.Sign(bigJumpID, s)) {
t.Errorf("bigJumpID.Batch++ does not verify")
}
}
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