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package certifiers
import (
"time"
crypto "github.com/tendermint/go-crypto"
"github.com/tendermint/tendermint/types"
)
// ValKeys is a helper for testing.
//
// It lets us simulate signing with many keys, either ed25519 or secp256k1.
// The main use case is to create a set, and call GenCommit
// to get propely signed header for testing.
//
// You can set different weights of validators each time you call
// ToValidators, and can optionally extend the validator set later
// with Extend or ExtendSecp
type ValKeys []crypto.PrivKey
// GenValKeys produces an array of private keys to generate commits
func GenValKeys(n int) ValKeys {
res := make(ValKeys, n)
for i := range res {
res[i] = crypto.GenPrivKeyEd25519().Wrap()
}
return res
}
// Change replaces the key at index i
func (v ValKeys) Change(i int) ValKeys {
res := make(ValKeys, len(v))
copy(res, v)
res[i] = crypto.GenPrivKeyEd25519().Wrap()
return res
}
// Extend adds n more keys (to remove, just take a slice)
func (v ValKeys) Extend(n int) ValKeys {
extra := GenValKeys(n)
return append(v, extra...)
}
// GenSecpValKeys produces an array of secp256k1 private keys to generate commits
func GenSecpValKeys(n int) ValKeys {
res := make(ValKeys, n)
for i := range res {
res[i] = crypto.GenPrivKeySecp256k1().Wrap()
}
return res
}
// ExtendSecp adds n more secp256k1 keys (to remove, just take a slice)
func (v ValKeys) ExtendSecp(n int) ValKeys {
extra := GenSecpValKeys(n)
return append(v, extra...)
}
// ToValidators produces a list of validators from the set of keys
// The first key has weight `init` and it increases by `inc` every step
// so we can have all the same weight, or a simple linear distribution
// (should be enough for testing)
func (v ValKeys) ToValidators(init, inc int64) *types.ValidatorSet {
res := make([]*types.Validator, len(v))
for i, k := range v {
res[i] = types.NewValidator(k.PubKey(), init+int64(i)*inc)
}
return types.NewValidatorSet(res)
}
// signHeader properly signs the header with all keys from first to last exclusive
func (v ValKeys) signHeader(header *types.Header, first, last int) *types.Commit {
votes := make([]*types.Vote, len(v))
// we need this list to keep the ordering...
vset := v.ToValidators(1, 0)
// fill in the votes we want
for i := first; i < last; i++ {
vote := makeVote(header, vset, v[i])
votes[vote.ValidatorIndex] = vote
}
res := &types.Commit{
BlockID: types.BlockID{Hash: header.Hash()},
Precommits: votes,
}
return res
}
func makeVote(header *types.Header, vals *types.ValidatorSet, key crypto.PrivKey) *types.Vote {
addr := key.PubKey().Address()
idx, _ := vals.GetByAddress(addr)
vote := &types.Vote{
ValidatorAddress: addr,
ValidatorIndex: idx,
Height: header.Height,
Round: 1,
Type: types.VoteTypePrecommit,
BlockID: types.BlockID{Hash: header.Hash()},
}
// Sign it
signBytes := types.SignBytes(header.ChainID, vote)
vote.Signature = key.Sign(signBytes)
return vote
}
func genHeader(chainID string, height int, txs types.Txs,
vals *types.ValidatorSet, appHash []byte) *types.Header {
return &types.Header{
ChainID: chainID,
Height: height,
Time: time.Now(),
NumTxs: len(txs),
// LastBlockID
// LastCommitHash
ValidatorsHash: vals.Hash(),
DataHash: txs.Hash(),
AppHash: appHash,
}
}
// GenCommit calls genHeader and signHeader and combines them into a Commit
func (v ValKeys) GenCommit(chainID string, height int, txs types.Txs,
vals *types.ValidatorSet, appHash []byte, first, last int) Commit {
header := genHeader(chainID, height, txs, vals, appHash)
check := Commit{
Header: header,
Commit: v.signHeader(header, first, last),
}
return check
}
// GenFullCommit calls genHeader and signHeader and combines them into a Commit
func (v ValKeys) GenFullCommit(chainID string, height int, txs types.Txs,
vals *types.ValidatorSet, appHash []byte, first, last int) FullCommit {
header := genHeader(chainID, height, txs, vals, appHash)
commit := Commit{
Header: header,
Commit: v.signHeader(header, first, last),
}
return NewFullCommit(commit, vals)
}