use ecdsa signature and submit extrinsic.but got 'Transaction has a bad signature'

[litterGuy]

Due to the problem of public key derivation, I considered using ecdsa to generate an account. But after ecdsa signs, there will be signature errors. Where should I go to troubleshoot and solve this problem?

in the westend network,i use code like that:

scheme := ecdsa.Scheme{}
pari, err := scheme.FromSeed(secert)
if err != nil {
     return nil, nil, err
}

sig, err := signECDSA(data, hex.EncodeToString(signer.Seed()))
if err != nil {
    return e, err
}

multiSig := types.MultiSignature{IsEcdsa: true, AsEcdsa: types.NewBytes(sig)}

func signECDSA(data []byte, privateKeyURI string) ([]byte, error) {
	// if data is longer than 256 bytes, hash it first
	if len(data) > 256 {
		h := blake2b.Sum256(data)
		data = h[:]
	}
	scheme := ecdsa.Scheme{}
	kyr, err := subkey.DeriveKeyPair(scheme, privateKeyURI)
	if err != nil {
		return nil, err
	}

	signature, err := kyr.Sign(data)
	if err != nil {
		return nil, err
	}
	return signature, nil
}

[litterGuy]

And in the ecdsa,the public key is 33 byte, but 'MultiAddress'

type MultiAddress struct {
	AccountId AccountID
	Index     UCompact
	Raw       Bytes
	Address32 H256
	Address20 H160
	types     int
}

accountid is 32 byte. I think it was caused by an error in the public key transmission,but i can`t fix this by change MultiAddress.

code : sign_ecdsa.go

plz help

[vedhavyas]

@litterGuy have you tried the RawBytes?

[litterGuy]

@litterGuy have you tried the RawBytes?

Also tried. Set RawBytes as public key ( 33 byte ), and result the error is

{"Code":1011,"Message":"Unknown Transaction Validity","Data":"CannotLookup"}

[vedhavyas]

@litterGuy i just looked at the substrate code. looks like you have to do a blake2b hash of compressed 33 byte pub key to get 32 byte key which will be the public key - sp_io::hashing::blake2_256(&who.as_ref()[..]).into() https://github.com/paritytech/substrate/blob/master/primitives/runtime/src/lib.rs#L292.

You can give it a shot if you want

[litterGuy]

Thanks for the help, i will try later

[litterGuy]

accountId:= blake2b.Sum256(kr.Public())

and set accountId(32 byte) to raw, also get the same error is :

{"Code":1011,"Message":"Unknown Transaction Validity","Data":"CannotLookup"}

when set "AsID" = accountId , the error is 'Transaction has a bad signature'.

are there any other suggestions?

[cdamian]

This issue seems stale, closing it for now. Please let us know if you still need help.