以太坊橢圓曲線Specp256k1經過消息的hash和簽名（對消息的hash的簽名）來恢復出公鑰和計算r值

源代碼 https://github.com/ethereum/go-ethereum/blob/master/crypto/secp256k1/secp256.go 

// RecoverPubkey returns the the public key of the signer.

// msg must be the 32-byte hash of the message to be signed.

// sig must be a 65-byte compact ECDSA signature containing the

// recovery id as the last element.

RecoverPubkey(msg []byte, sig []byte)

其中」sig must be a 65-byte compact ECDSA signature containing the recovery id as the last element.「，說明了最後一個recovery id指的是 rG的x座標。

 

 

。。。細節以後解釋。