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parmas, crypto, core, core/vm: homestead consensus protocol changes

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* change gas cost for contract creating txs
* invalidate signature with s value greater than secp256k1 N / 2
* OOG contract creation if not enough gas to store code
* new difficulty adjustment algorithm
* new DELEGATECALL op code
This commit is contained in:
Gustav Simonsson
2015-11-27 15:40:29 +01:00
committed by Jeffrey Wilcke
parent aa36a6ae4f
commit 371871d685
55 changed files with 25878 additions and 11229 deletions
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13
crypto/crypto.go
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@ -163,12 +163,21 @@ func GenerateKey() (*ecdsa.PrivateKey, error) {
return ecdsa.GenerateKey(secp256k1.S256(), rand.Reader)
}
func ValidateSignatureValues(v byte, r, s *big.Int) bool {
func ValidateSignatureValues(v byte, r, s *big.Int, homestead bool) bool {
if r.Cmp(common.Big1) < 0 || s.Cmp(common.Big1) < 0 {
return false
}
vint := uint32(v)
if r.Cmp(secp256k1.N) < 0 && s.Cmp(secp256k1.N) < 0 && (vint == 27 || vint == 28) {
// reject upper range of s values (ECDSA malleability)
// see discussion in secp256k1/libsecp256k1/include/secp256k1.h
if homestead && s.Cmp(secp256k1.HalfN) > 0 {
return false
}
// Frontier: allow s to be in full N range
if s.Cmp(secp256k1.N) >= 0 {
return false
}
if r.Cmp(secp256k1.N) < 0 && (vint == 27 || vint == 28) {
return true
} else {
return false