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| author | Gustav Simonsson <gustav.simonsson@gmail.com> | 2015-06-02 02:27:20 +0800 |
|---|---|---|
| committer | Gustav Simonsson <gustav.simonsson@gmail.com> | 2015-06-02 03:06:52 +0800 |
| commit | 32e1b104f8fbc0f80bf2b6a93492aa01fa323e35 (patch) | |
| tree | a9725f648bdd47d3e5b72b21ddf728e90656a974 /crypto | |
| parent | 5b14fdb94b61af9f17f53593766a706c9780a7be (diff) | |
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Add EC signature validations before call to libsecp256k1
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/crypto.go | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/crypto/crypto.go b/crypto/crypto.go index 4bbd62f7f..d5291fe1d 100644 --- a/crypto/crypto.go +++ b/crypto/crypto.go @@ -10,6 +10,7 @@ import ( "fmt" "io" "io/ioutil" + "math/big" "os" "encoding/hex" @@ -151,6 +152,19 @@ func GenerateKey() (*ecdsa.PrivateKey, error) { return ecdsa.GenerateKey(S256(), rand.Reader) } +func ValidateSignatureValues(v byte, r, s *big.Int) bool { + secp256k1n := common.String2Big("0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141") + 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 { |