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52 lines
1.8 KiB
52 lines
1.8 KiB
package chain
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import (
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"errors"
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bls_core "github.com/harmony-one/bls/ffi/go/bls"
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"github.com/harmony-one/harmony/crypto/bls"
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"github.com/harmony-one/harmony/internal/utils"
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)
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// ReadSignatureBitmapByPublicKeys read the payload of signature and bitmap based on public keys
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func ReadSignatureBitmapByPublicKeys(recvPayload []byte, publicKeys []bls.PublicKeyWrapper) (*bls_core.Sign, *bls.Mask, error) {
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sig, bitmap, err := ParseCommitSigAndBitmap(recvPayload)
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if err != nil {
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return nil, nil, err
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}
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return decodeSigBitmap(sig, bitmap, publicKeys)
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}
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// ParseCommitSigAndBitmap parse the commitSigAndBitmap to signature + bitmap
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func ParseCommitSigAndBitmap(payload []byte) (bls.SerializedSignature, []byte, error) {
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if len(payload) < bls.BLSSignatureSizeInBytes {
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return bls.SerializedSignature{}, nil, errors.New("payload not have enough length")
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}
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var (
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sig bls.SerializedSignature
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bitmap = make([]byte, len(payload)-bls.BLSSignatureSizeInBytes)
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)
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copy(sig[:], payload[:bls.BLSSignatureSizeInBytes])
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copy(bitmap, payload[bls.BLSSignatureSizeInBytes:])
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return sig, bitmap, nil
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}
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// decodeSigBitmap decode and parse the signature, bitmap with the given public keys
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func decodeSigBitmap(sigBytes bls.SerializedSignature, bitmap []byte, pubKeys []bls.PublicKeyWrapper) (*bls_core.Sign, *bls.Mask, error) {
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aggSig := bls_core.Sign{}
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err := aggSig.Deserialize(sigBytes[:])
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if err != nil {
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return nil, nil, errors.New("unable to deserialize multi-signature from payload")
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}
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mask, err := bls.NewMask(pubKeys, nil)
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if err != nil {
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utils.Logger().Warn().Err(err).Msg("onNewView unable to setup mask for prepared message")
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return nil, nil, errors.New("unable to setup mask from payload")
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}
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if err := mask.SetMask(bitmap); err != nil {
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utils.Logger().Warn().Err(err).Msg("mask.SetMask failed")
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}
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return &aggSig, mask, nil
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}
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