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