neoneo-go/pkg/core/interop/crypto/ecdsa.go

52 lines
1.6 KiB
Go
Raw Normal View History

package crypto
import (
"crypto/elliptic"
"errors"
"fmt"
"github.com/nspcc-dev/neo-go/pkg/core/fee"
"github.com/nspcc-dev/neo-go/pkg/core/interop"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/vm"
)
// ECDSASecp256r1CheckMultisig checks multiple ECDSA signatures at once using
// Secp256r1 elliptic curve.
2020-08-07 11:37:49 +00:00
func ECDSASecp256r1CheckMultisig(ic *interop.Context) error {
hashToCheck := ic.Container.GetSignedHash()
2020-08-07 11:37:49 +00:00
pkeys, err := ic.VM.Estack().PopSigElements()
if err != nil {
return fmt.Errorf("wrong parameters: %w", err)
}
if !ic.VM.AddGas(ic.BaseExecFee() * fee.ECDSAVerifyPrice * int64(len(pkeys))) {
return errors.New("gas limit exceeded")
}
2020-08-07 11:37:49 +00:00
sigs, err := ic.VM.Estack().PopSigElements()
if err != nil {
return fmt.Errorf("wrong parameters: %w", err)
}
// It's ok to have more keys than there are signatures (it would
// just mean that some keys didn't sign), but not the other way around.
if len(pkeys) < len(sigs) {
return errors.New("more signatures than there are keys")
}
sigok := vm.CheckMultisigPar(ic.VM, elliptic.P256(), hashToCheck.BytesBE(), pkeys, sigs)
2020-08-07 11:37:49 +00:00
ic.VM.Estack().PushVal(sigok)
return nil
}
2021-03-04 17:56:54 +00:00
// ECDSASecp256r1CheckSig checks ECDSA signature using Secp256r1 elliptic curve.
func ECDSASecp256r1CheckSig(ic *interop.Context) error {
hashToCheck := ic.Container.GetSignedHash()
keyb := ic.VM.Estack().Pop().Bytes()
signature := ic.VM.Estack().Pop().Bytes()
pkey, err := keys.NewPublicKeyFromBytes(keyb, elliptic.P256())
if err != nil {
return err
}
res := pkey.Verify(signature, hashToCheck.BytesBE())
ic.VM.Estack().PushVal(res)
return nil
}