Function sp_io::crypto::secp256k1_ecdsa_recover

pub fn secp256k1_ecdsa_recover(
    sig: &[u8; 65], 
    msg: &[u8; 32]
) -> Result<[u8; 64], EcdsaVerifyError>

Verify and recover a SECP256k1 ECDSA signature.

• sig is passed in RSV format. V should be either 0/1 or 27/28.
• msg is the blake2-256 hash of the message.

Returns Err if the signature is bad, otherwise the 64-byte pubkey (doesn't include the 0x04 prefix).