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package multisig
import (
"math/rand"
"testing"
"github.com/stretchr/testify/require"
"github.com/tendermint/tendermint/crypto"
"github.com/tendermint/tendermint/crypto/ed25519"
"github.com/tendermint/tendermint/crypto/secp256k1"
)
// This tests multisig functionality, but it expects the first k signatures to be valid
// TODO: Adapt it to give more flexibility about first k signatures being valid
func TestThresholdMultisigValidCases(t *testing.T) {
pkSet1, sigSet1 := generatePubKeysAndSignatures(5, []byte{1, 2, 3, 4})
cases := []struct {
msg []byte
k int
pubkeys []crypto.PubKey
signingIndices []int
// signatures should be the same size as signingIndices.
signatures [][]byte
passAfterKSignatures []bool
}{
{
msg: []byte{1, 2, 3, 4},
k: 2,
pubkeys: pkSet1,
signingIndices: []int{0, 3, 1},
signatures: sigSet1,
passAfterKSignatures: []bool{false},
},
}
for tcIndex, tc := range cases {
multisigKey := NewThresholdMultiSignaturePubKey(tc.k, tc.pubkeys)
multisignature := NewMultisig(len(tc.pubkeys))
for i := 0; i < tc.k-1; i++ {
signingIndex := tc.signingIndices[i]
multisignature.AddSignatureFromPubkey(tc.signatures[signingIndex], tc.pubkeys[signingIndex], tc.pubkeys)
require.False(t, multisigKey.VerifyBytes(tc.msg, multisignature.Marshal()),
"multisig passed when i < k, tc %d, i %d", tcIndex, i)
multisignature.AddSignatureFromPubkey(tc.signatures[signingIndex], tc.pubkeys[signingIndex], tc.pubkeys)
require.Equal(t, i+1, len(multisignature.Sigs),
"adding a signature for the same pubkey twice increased signature count by 2, tc %d", tcIndex)
}
require.False(t, multisigKey.VerifyBytes(tc.msg, multisignature.Marshal()),
"multisig passed with k - 1 sigs, tc %d", tcIndex)
multisignature.AddSignatureFromPubkey(tc.signatures[tc.signingIndices[tc.k]], tc.pubkeys[tc.signingIndices[tc.k]], tc.pubkeys)
require.True(t, multisigKey.VerifyBytes(tc.msg, multisignature.Marshal()),
"multisig failed after k good signatures, tc %d", tcIndex)
for i := tc.k + 1; i < len(tc.signingIndices); i++ {
signingIndex := tc.signingIndices[i]
multisignature.AddSignatureFromPubkey(tc.signatures[signingIndex], tc.pubkeys[signingIndex], tc.pubkeys)
require.Equal(t, tc.passAfterKSignatures[i-tc.k-1],
multisigKey.VerifyBytes(tc.msg, multisignature.Marshal()),
"multisig didn't verify as expected after k sigs, tc %d, i %d", tcIndex, i)
multisignature.AddSignatureFromPubkey(tc.signatures[signingIndex], tc.pubkeys[signingIndex], tc.pubkeys)
require.Equal(t, i+1, len(multisignature.Sigs),
"adding a signature for the same pubkey twice increased signature count by 2, tc %d", tcIndex)
}
}
}
// TODO: Fully replace this test with table driven tests
func TestThresholdMultisigDuplicateSignatures(t *testing.T) {
msg := []byte{1, 2, 3, 4, 5}
pubkeys, sigs := generatePubKeysAndSignatures(5, msg)
multisigKey := NewThresholdMultiSignaturePubKey(2, pubkeys)
multisignature := NewMultisig(5)
require.False(t, multisigKey.VerifyBytes(msg, multisignature.Marshal()))
multisignature.AddSignatureFromPubkey(sigs[0], pubkeys[0], pubkeys)
// Add second signature manually
multisignature.Sigs = append(multisignature.Sigs, sigs[0])
require.False(t, multisigKey.VerifyBytes(msg, multisignature.Marshal()))
}
// TODO: Fully replace this test with table driven tests
func TestMultiSigPubkeyEquality(t *testing.T) {
msg := []byte{1, 2, 3, 4}
pubkeys, _ := generatePubKeysAndSignatures(5, msg)
multisigKey := NewThresholdMultiSignaturePubKey(2, pubkeys)
var unmarshalledMultisig *ThresholdMultiSignaturePubKey
cdc.MustUnmarshalBinaryBare(multisigKey.Bytes(), &unmarshalledMultisig)
require.True(t, multisigKey.Equals(unmarshalledMultisig))
// Ensure that reordering pubkeys is treated as a different pubkey
pubkeysCpy := make([]crypto.PubKey, 5)
copy(pubkeysCpy, pubkeys)
pubkeysCpy[4] = pubkeys[3]
pubkeysCpy[3] = pubkeys[4]
multisigKey2 := NewThresholdMultiSignaturePubKey(2, pubkeysCpy)
require.False(t, multisigKey.Equals(multisigKey2))
}
func generatePubKeysAndSignatures(n int, msg []byte) (pubkeys []crypto.PubKey, signatures [][]byte) {
pubkeys = make([]crypto.PubKey, n)
signatures = make([][]byte, n)
for i := 0; i < n; i++ {
var privkey crypto.PrivKey
if rand.Int63()%2 == 0 {
privkey = ed25519.GenPrivKey()
} else {
privkey = secp256k1.GenPrivKey()
}
pubkeys[i] = privkey.PubKey()
signatures[i], _ = privkey.Sign(msg)
}
return
}