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Additional check when Ks mismatch in savedata and sortedID

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This commit is contained in:
Gustavo Frederico
2021-12-13 11:41:25 -05:00
committed by creamwhip
parent b401af0289
commit c58e4b5ad1
4 changed files with 15 additions and 6 deletions
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4
ecdsa/keygen/save_data.go
View File

@@ -8,9 +8,9 @@ package keygen
import (
"encoding/hex"
"errors"
"math/big"
"github.com/binance-chain/tss-lib/common"
"github.com/binance-chain/tss-lib/crypto"
"github.com/binance-chain/tss-lib/crypto/paillier"
"github.com/binance-chain/tss-lib/ecdsa"
@@ -100,7 +100,7 @@ func BuildLocalSaveDataSubset(sourceData LocalPartySaveData, sortedIDs tss.Sorte
keyAndShift := new(big.Int).Add(idKey, reshareKeyOffset)
savedIdx, ok := keysToIndices[hex.EncodeToString(keyAndShift.Bytes())]
if !ok {
common.Logger.Warn("BuildLocalSaveDataSubset: unable to find a signer party in the local save data", id)
panic(errors.New("BuildLocalSaveDataSubset: unable to find a signer party in the local save data"))
}
newData.Ks[j] = sourceData.Ks[savedIdx]
newData.NTildej[j] = sourceData.NTildej[savedIdx]

7
ecdsa/signing/prepare.go
View File

@@ -34,8 +34,13 @@ func PrepareForSigning(i, pax int, xi *big.Int, ks []*big.Int, bigXs []*crypto.E
if j == i {
continue
}
ksj := ks[j]
ksi := ks[i]
if ksj.Cmp(ksi) == 0 {
panic(fmt.Errorf("index of two parties are equal"))
}
// big.Int Div is calculated as: a/b = a * modInv(b,q)
coef := modQ.Mul(ks[j], modQ.Inverse(new(big.Int).Sub(ks[j], ks[i])))
coef := modQ.Mul(ks[j], modQ.Inverse(new(big.Int).Sub(ksj, ksi)))
wi = modQ.Mul(wi, coef)
}

3
eddsa/keygen/save_data.go
View File

@@ -10,7 +10,6 @@ import (
"encoding/hex"
"math/big"
"github.com/binance-chain/tss-lib/common"
"github.com/binance-chain/tss-lib/crypto"
"github.com/binance-chain/tss-lib/tss"
)
@@ -54,7 +53,7 @@ func BuildLocalSaveDataSubset(sourceData LocalPartySaveData, sortedIDs tss.Sorte
for j, id := range sortedIDs {
savedIdx, ok := keysToIndices[hex.EncodeToString(id.Key)]
if !ok {
common.Logger.Warn("BuildLocalSaveDataSubset: unable to find a signer party in the local save data", id)
panic("BuildLocalSaveDataSubset: unable to find a signer party in the local save data")
}
newData.Ks[j] = sourceData.Ks[savedIdx]
newData.BigXj[j] = sourceData.BigXj[savedIdx]

7
eddsa/signing/prepare.go
View File

@@ -30,8 +30,13 @@ func PrepareForSigning(i, pax int, xi *big.Int, ks []*big.Int) (wi *big.Int) {
if j == i {
continue
}
ksj := ks[j]
ksi := ks[i]
if ksj.Cmp(ksi) == 0 {
panic(fmt.Errorf("index of two parties are equal"))
}
// big.Int Div is calculated as: a/b = a * modInv(b,q)
coef := modQ.Mul(ks[j], modQ.Inverse(new(big.Int).Sub(ks[j], ks[i])))
coef := modQ.Mul(ks[j], modQ.Inverse(new(big.Int).Sub(ksj, ksi)))
wi = modQ.Mul(wi, coef)
}