newBitcoinECC.py 文件源码

def VerifyMessageFromAddress(self,addr,message,sig):
        #Check a signature (r,s) for the message m signed by the Bitcoin 
        # address "addr".

        sign=base64.standard_b64decode(sig)
        (r,s)=(Byte2Int(sign[1:33]),Byte2Int(sign[33:65]))

        z=Byte2Int(Hash(Hash(MsgMagic(message),"SHA256"),"SHA256"))        

        val=ord(sign[0])
        if val<27 or val>=35:
            return False

        if val>=31:
            uncompressed=False
            val-=4
        else:
            uncompressed=True

        x=r
        y2=(pow(x,3,self.p) + self.a*x + self.b) % self.p
        y=Cipolla(y2,self.p)

        for _ in range(2):
            kG=EllipticCurvePoint([x,y,1],self.a,self.b,self.p,self.n)  
            mzG=self*((-z)%self.n)
            Q=(kG*s+mzG)*InvMod(r,self.n)

            if self.AddressFromPublicKey(Q,uncompressed)==addr:
                return True

            y=self.p-y

        return False