nRF9160-DK ECDSA v value

[Gioele]

Hello!
We are trying to sign our data using ECDSA (https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/crypto/ecdsa/README.html), so we can send our information to an Ethereum Blockchain. To send the transaction we need to obtain the "v value". Some searches made us understand that the "v value" is related to the coordinates of our "r value" so it should be 0 or 1 plus 27. Is there a way to obtain the coordinates of our "r value"? Or better, is there a way to obtain the " v value"?

Thank you very much!

[Gioele]

This is our private key:

static uint8_t m_priv_key[32] = {
		0x4f, 0x3e, 0xdf, 0x98, 0x3a,
		0xc6, 0x36, 0xa6, 0x5a, 0x84, 
		0x2c, 0xe7, 0xc7, 0x8d, 0x9a, 
		0xa7, 0x06, 0xd3, 0xb1, 0x13, 
		0xbc, 0xe9, 0xc4, 0x6f, 0x30, 
		0xd7 ,0xd2, 0x17 ,0x15 ,0xb2, 
		0x3b, 0x1d
	};

Related to our Ganache account.

[dejans]

Hi,

It might be possible to read keys using ganache-cli in a way specified here.

Best regards,
Dejan