mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
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fa01ee5eba
* WIP * WIP * WIP * Add tests * WIP * Add more tests * Address DeepSource errors * Remove unused param * Add more tests * Address PR comments * Address PR comments * Fix formatting * Remove unused parameter * Fix TestLittleEndianBytesToBigInt Co-authored-by: Radosław Kapka <rkapka@wp.pl>
80 lines
2.8 KiB
Go
80 lines
2.8 KiB
Go
package interop
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import (
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"encoding/binary"
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"math/big"
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"sync"
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"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
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"github.com/pkg/errors"
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"github.com/prysmaticlabs/prysm/v3/async"
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"github.com/prysmaticlabs/prysm/v3/crypto/bls"
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"github.com/prysmaticlabs/prysm/v3/crypto/hash"
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)
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const (
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blsWithdrawalPrefixByte = byte(0)
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)
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// DeterministicallyGenerateKeys creates BLS private keys using a fixed curve order according to
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// the algorithm specified in the Ethereum beacon chain specification interop mock start section found here:
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// https://github.com/ethereum/eth2.0-pm/blob/a085c9870f3956d6228ed2a40cd37f0c6580ecd7/interop/mocked_start/README.md
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func DeterministicallyGenerateKeys(startIndex, numKeys uint64) ([]bls.SecretKey, []bls.PublicKey, error) {
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privKeys := make([]bls.SecretKey, numKeys)
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pubKeys := make([]bls.PublicKey, numKeys)
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type keys struct {
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secrets []bls.SecretKey
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publics []bls.PublicKey
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}
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// lint:ignore uintcast -- this is safe because we can reasonably expect that the number of keys is less than max int64.
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results, err := async.Scatter(int(numKeys), func(offset int, entries int, _ *sync.RWMutex) (interface{}, error) {
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secs, pubs, err := deterministicallyGenerateKeys(uint64(offset)+startIndex, uint64(entries))
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return &keys{secrets: secs, publics: pubs}, err
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})
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if err != nil {
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return nil, nil, errors.Wrap(err, "failed to generate keys")
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}
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for _, result := range results {
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if keysExtent, ok := result.Extent.(*keys); ok {
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copy(privKeys[result.Offset:], keysExtent.secrets)
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copy(pubKeys[result.Offset:], keysExtent.publics)
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} else {
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return nil, nil, errors.New("extent not of expected type")
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}
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}
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return privKeys, pubKeys, nil
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}
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func deterministicallyGenerateKeys(startIndex, numKeys uint64) ([]bls.SecretKey, []bls.PublicKey, error) {
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privKeys := make([]bls.SecretKey, numKeys)
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pubKeys := make([]bls.PublicKey, numKeys)
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for i := startIndex; i < startIndex+numKeys; i++ {
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enc := make([]byte, 32)
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binary.LittleEndian.PutUint32(enc, uint32(i))
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h := hash.Hash(enc)
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// Reverse byte order to big endian for use with big ints.
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num := bytesutil.LittleEndianBytesToBigInt(h[:])
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order := new(big.Int)
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var ok bool
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order, ok = order.SetString(bls.CurveOrder, 10)
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if !ok {
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return nil, nil, errors.New("could not set bls curve order as big int")
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}
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num = num.Mod(num, order)
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numBytes := num.Bytes()
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// pad key at the start with zero bytes to make it into a 32 byte key
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if len(numBytes) < 32 {
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emptyBytes := make([]byte, 32-len(numBytes))
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numBytes = append(emptyBytes, numBytes...)
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}
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priv, err := bls.SecretKeyFromBytes(numBytes)
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if err != nil {
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return nil, nil, errors.Wrapf(err, "could not create bls secret key at index %d from raw bytes", i)
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}
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privKeys[i-startIndex] = priv
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pubKeys[i-startIndex] = priv.PublicKey()
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}
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return privKeys, pubKeys, nil
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}
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