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authorJeffrey Wilcke <jeffrey@ethereum.org>2015-06-03 23:11:24 +0800
committerJeffrey Wilcke <jeffrey@ethereum.org>2015-06-03 23:11:24 +0800
commit02f785af70d9d91d38ce44163a79c16ab288d55f (patch)
treebdcad5df97e544d93698bf587eb98c6ca542d734 /crypto
parent827bccb64b97dd19918160af99951e8917c2d3f7 (diff)
parentedbd902a1b5e2d8d1fdff8e876594eb1859839e8 (diff)
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Merge pull request #1166 from Gustav-Simonsson/add_ec_sig_validations
Add EC signature validations before call to libsecp256k1
Diffstat (limited to 'crypto')
-rw-r--r--crypto/crypto.go16
1 files changed, 16 insertions, 0 deletions
diff --git a/crypto/crypto.go b/crypto/crypto.go
index 4bbd62f7f..9aef44863 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -10,6 +10,7 @@ import (
"fmt"
"io"
"io/ioutil"
+ "math/big"
"os"
"encoding/hex"
@@ -26,9 +27,12 @@ import (
"golang.org/x/crypto/ripemd160"
)
+var secp256k1n *big.Int
+
func init() {
// specify the params for the s256 curve
ecies.AddParamsForCurve(S256(), ecies.ECIES_AES128_SHA256)
+ secp256k1n = common.String2Big("0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141")
}
func Sha3(data ...[]byte) []byte {
@@ -151,6 +155,18 @@ func GenerateKey() (*ecdsa.PrivateKey, error) {
return ecdsa.GenerateKey(S256(), rand.Reader)
}
+func ValidateSignatureValues(v byte, r, s *big.Int) bool {
+ vint := uint32(v)
+ if r.Cmp(common.Big0) == 0 || s.Cmp(common.Big0) == 0 {
+ return false
+ }
+ if r.Cmp(secp256k1n) < 0 && s.Cmp(secp256k1n) < 0 && (vint == 27 || vint == 28) {
+ return true
+ } else {
+ return false
+ }
+}
+
func SigToPub(hash, sig []byte) (*ecdsa.PublicKey, error) {
s, err := Ecrecover(hash, sig)
if err != nil {