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authorobscuren <geffobscura@gmail.com>2015-03-29 19:34:41 +0800
committerobscuren <geffobscura@gmail.com>2015-03-29 19:34:41 +0800
commitaf153e78849871cff7cef494533fb7f028957083 (patch)
treebba3abea350040aa74857974a98c22365d89eaeb /core
parent3b20603eb1373cab402babd1d3878a96fe7de5a7 (diff)
parentd2fa6e7753deb0f7fe5e1d802460c88c2885b954 (diff)
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Merge branch 'fix_ecrecover' of https://github.com/ebuchman/go-ethereum into ebuchman-fix_ecrecover
Diffstat (limited to 'core')
-rw-r--r--core/vm/address.go28
1 files changed, 21 insertions, 7 deletions
diff --git a/core/vm/address.go b/core/vm/address.go
index 215f4bc8f..e4c33ec80 100644
--- a/core/vm/address.go
+++ b/core/vm/address.go
@@ -3,8 +3,8 @@ package vm
import (
"math/big"
- "github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/crypto"
)
type Address interface {
@@ -61,15 +61,29 @@ func ripemd160Func(in []byte) []byte {
return common.LeftPadBytes(crypto.Ripemd160(in), 32)
}
-func ecrecoverFunc(in []byte) []byte {
- // In case of an invalid sig. Defaults to return nil
- defer func() { recover() }()
+const EcRecoverInputLength = 128
+func ecrecoverFunc(in []byte) []byte {
+ // "in" is (hash, v, r, s), each 32 bytes
+ // but for ecrecover we want (r, s, v)
+ if len(in) < EcRecoverInputLength {
+ return nil
+ }
hash := in[:32]
- v := common.BigD(in[32:64]).Bytes()[0] - 27
+ // v is only a bit, but comes as 32 bytes from vm. We only need least significant byte
+ encodedV := in[32:64]
+ v := encodedV[31] - 27
+ if !(v == 0 || v == 1) {
+ return nil
+ }
sig := append(in[64:], v)
-
- return common.LeftPadBytes(crypto.Sha3(crypto.Ecrecover(append(hash, sig...))[1:])[12:], 32)
+ pubKey := crypto.Ecrecover(append(hash, sig...))
+ // secp256.go returns either nil or 65 bytes
+ if pubKey == nil || len(pubKey) != 65 {
+ return nil
+ }
+ // the first byte of pubkey is bitcoin heritage
+ return common.LeftPadBytes(crypto.Sha3(pubKey[1:])[12:], 32)
}
func memCpy(in []byte) []byte {